Tuesday, May 15, 2012

The Beauty of Mid-Late Spring 2012


April 27, 2012
Yellow Lady's Slipper ( Cypripedium parviflorum )
Photograph by Wayne Riner - © All Rights Reserved.


Wayne Riner Photograph Thoughts...
"There, beside of the road, was this gorgeous yellow lady slipper.  It is a one of our native orchids, the one that I think of as the yellow queen of the deep forest."

No one living in or visiting this ancient mountain landscape of the southern Appalachians can deny the awesome beauty that is spring!

The High Knob Landform
Cumberland Gap National Historical Park
Spring Forest of The Cumberland Gap In Misty Fog
Photograph by Roddy Addington - © All Rights Reserved.


NW Flank of High Knob Landform
Cumberland Gap National Historical Park
View Looking NE from The Pinnacle Overlook
Photograph by Roddy Addington - © All Rights Reserved.

Some folks think of a cloudy, rainy day as being sad and depressing but I think of it as glorious and magical as life giving water from the heavens above nourishes a diversity of living things beyond our wildest imaginations.

April 22, 2012
Cumberland Gap National Historical Park
Sweeping Vista from The Pinnacle Overlook
Photograph by Roddy Addington - © All Rights Reserved.

Climate Statistics
For April 2012

( Lower Elevations of Russell Fork Basin )
Clintwood 1 W - Elevation 1560 feet
Average Daily MAX: 67.7 degrees
Average Daily MIN: 39.1 degrees
MEAN: 53.4 degrees
Highest Temperature: 82 degrees
Lowest Temperature: 25 degrees
Total Rainfall: 4.81"
Snowfall: Trace
2012 Precipitation: 16.08"

( Northern Base of High Knob Massif )
City of Norton - Elevation 2141 feet
Average Daily MAX: 64.0 degrees
Average Daily MIN: 37.6 degrees
MEAN: 50.8 degrees
Highest Temperature: 79 degrees
Lowest Temperature: 23 degrees
Total Rainfall: 5.54"
Snowfall: Trace
2012 Precipitation: 23.29"

( Along the Tennessee Valley Divide )
Nora 4 SSE - Elevation 2650 feet
Average Daily MAX: 62.0 degrees
Average Daily MIN: 42.6 degrees
MEAN: 52.3 degrees
Highest Temperature: 78 degrees
Lowest Temperature: 29 degrees
Total Rainfall: 4.87"
Snowfall: 0.3"
2012 Precipitation: 17.94"

( Northern Edge of The Cedars )
Jonesville 3.1 WSW - Elevation 1422 feet
Average Daily MAX: 69.5 degrees
Average Daily MIN: 42.5 degrees
MEAN: 56.0 degrees
Highest Temperature: 84 degrees
Lowest Temperature: 24 degrees
Total Rainfall: 2.81"
2012 Precipitation: 19.38"

In the High Knob highcountry temp means during April varied from mid-upper 50s by day at highest elevations to the 30s at night in colder mountain valleys.

April precipitation varied from 3.00" to 6.00" with the heaviest 5.00" to 6.00" amounts across northern slopes of the massif, including the 
City of Norton and Coeburn areas.

April 26, 2012
High Knob Massif
Dark Skies Above Powell Valley
Photograph by Roddy Addington - © All Rights Reserved.

When moisture and big mountains get all tangled up there is indeed a special beauty to such days that fill all seasons in this land of wetness and extraordinary ecological diversity.

April 26, 2012
Little Stone Mountain Gap
Powell Valley Overlook of High Knob Massif
Photograph by Roddy Addington - © All Rights Reserved.

Plenty of March-April moisture was measured to support such days in the High Knob Landform, with a general 11.00" to 14.00"+ in the massif area.

Specific Precipitation Totals
( March-April 2012 )

Appalachia Lake Water Plant:  11.01"

Nora 4 SSE: 11.06"

Robinson Knob of High Knob Massif: 11.59"

Big Cherry Dam of High Knob Massif: 11.64" ( M )

Coeburn Filter Plant: 12.83"

City of Norton Water Plant: 13.41"

[ Even with up to 0.50" of March-April loss due to evaporation at Big Cherry Dam it averaged a little under its pace of the previous 40 months ( due mostly to less April rainfall at the Dam ) ].

April 26, 2012
Powell Valley Overlook Shrouded In Clouds
Photograph by Roddy Addington - © All Rights Reserved.

There were also many nice days in between, some featuring chilly conditions and simply spectacular mountain skies!

April 24, 2012
U.S. Route 23 at Powell Valley Overlook
Spectacular Skies Along The Crooked Road
Photograph by Roddy Addington - © All Rights Reserved.

April 24, 2012
Chilly Air & Spectacular Skies
A Day of Strong & Gusty WNW-NW Winds
Photograph by Roddy Addington - © All Rights Reserved.

My friends Wayne & Genevie Riner rescued an American Goldfinch that accidently flew into a window about this time in April.  With "bird in hand" the little fellow recovered and headed back toward the highland ridges.

April 22, 2012
Return To The Ridges
American Goldfinch ( Carduelis tristis )
Photograph by Wayne Riner - © All Rights Reserved.

Wayne Riner Photograph Thoughts...
"The American Goldfinch also known as the Eastern Goldfinch returns to the ridges of Dickenson County to follow one of its favorite foods, the dandelion.  This one flies away 
without a look back."


May 2012

May 12, 2012
High Knob Massif
Beautiful Spring Vegetation
Photograph by Roddy Addington - © All Rights Reserved.


Differences in spring emergence continued 
to be visible in May with upper elevations of the High Knob Massif lagging behind the lower terrain 
( below 2700 feet ).

The infamous "tenth of May spell" often talked about by local mountain folks, named for a chilly period that develops around this time every year, produced frosty conditions amid higher mountain valleys into morning hours of May 11 ( * ).

*This chilly spell was also called "Blackberry Winter" since the vines were in full bloom amid lower-middle elevations of the area where flowering and vegetation maturity is running ahead of schedule in 2012.

It was interesting to note that minimum temperatures displayed a distinct variation with increasing elevation in mountain valleys, with drier air in upper elevations helping support the strongest cooling.

May 12, 2012
Pappus Beauty of A May Composite
Photograph by Roddy Addington - © All Rights Reserved.

May 11 Temperatures In Valleys
High Knob Massif Area
( Minimums By Elevation )

36 degrees at 1560 feet

34 degrees at 2141 feet

32 degrees at 2740 feet

30 degrees at 3300 feet

The above suggests upper 20s to around 30 degree MINS were common on high valley floors of upper Big Cherry Basin and High Knob Lake Basin 
( elevation 3150 to 3500+ feet ).

May 1, 2012
A Time For Flowers
Black Locust ( Robinia pseudoacacia )
Photograph by Wayne Riner - © All Rights Reserved.

Wayne Riner Photograph Thoughts...
"Hanging like a pod of grapes, the creamy color of the black locust bloom is to soon disappear."

[ These beautiful bloom pods of Black Locust are the only part of this tree which are edible, eaten raw or better dipped in batter and fried into "fritters" ].


Climate Statistics
For May 1-15, 2012

Clintwood 1 W - Elevation 1560 feet
Average Daily MAX: 75.5 degrees
Average Daily MIN: 51.6 degrees
MEAN: 63.6 degrees
Total Rainfall: 1.98"
2012 Precipitation: 18.06"

City of Norton - Elevation 2141 feet
Average Daily MAX: 73.2 degrees
Average Daily MIN: 50.0 degrees
MEAN: 61.6 degrees
Total Rainfall: 2.87"
2012 Precipitation: 26.16"

Nora 4 SSE - Elevation 2650 feet
Average Daily MAX: 71.1 degrees
Average Daily MIN: 55.6 degrees
MEAN: 63.4 degrees
Total Rainfall: 1.82"
2012 Precipitation: 19.76"

In the High Knob highcountry, temperature means during the first half of May varied from mid-upper 60s above 2700 feet by day to 40s at night in colder mountain basins.

A general 2.50" to 3.50" of rainfall was near to below the typically wet pace for this mid-point in May ( one of the wettest months of the year ).


( Updated: May 18, 2012 )
Explosive Thunderstorm Development
High Knob Landform - Tennessee Valley Divide

May 18, 2012
NASA Visible Satellite Image At 2:45 PM

From relatively cool morning conditions, with temps in the chilly 40s to around 50 degrees amid higher valleys of the High Knob Massif area, there was an explosion of afternoon thunderstorms as clouds towered 40,000+ feet ( 8 vertical miles ) upward into the heavens above the 
High Knob Landform.

May 18, 2012
JKL Doppler Base Reflectivity At 2:41 PM

Downpours of heavy rain accompanied lightning and booming thunder as the storms blossomed along Little Stone Mountain into Powell Valley 
and Big Stone Gap by 2:41 PM.

Heavy rainfall also extended across Benges Basin of the Norton Reservoirs into upper portions of the majestic High Knob Lake and Big Cherry Lake basins ( although Big Cherry Dam actually missed the heavy action, the Lake still benefited from downpours falling upon the head of Big Cherry Basin ).

Doppler radar VIL densities and base reflectivities suggested hail, which was verified by numerous residents and photographs to support a MRX NWSFO Severe Thunderstorm Warning.

May 18, 2012
Hail & Heavy Rain In East Stone Gap of Wise County
Photograph Courtesy of Joe Rasnick
Submitted to News5 ( WCYB-TV )

The strongest convection pounded an area from Norton to Stickleyville and Pennington Gap as it drifted southwest through the calcareous core of the High Knob Landform.

The afternoon temperature dropped to 59 degrees in the City of Norton at 3:00 PM as the vigorous storms mixed down chilly air from aloft ( with even cooler conditions in higher elevations of the High Knob Massif ).

SW of Lovelady Gap
Dry Creek of Wallen Creek Basin
Result of Heavy Rain In Stickleyville of Lee County
Photograph Courtesy of Sarah Parsons
Submitted to News5 ( WCYB-TV )

Rain amounts were heavy enough to swell creeks as illustrated by Sarah Parsons in the beautiful Wallen Creek Basin of northeastern Lee County.

Andrew Greear and Joe Carter reported 0.38" of rain at Norton Water Plant to bring the May 1-19 tally to 3.26" 
( 17.12" for the Spring and 27.00" so far this year ).



Beautiful May Sunrise
Birch Knob of Pine Mountain

May 12, 2012
Elevation 3149 feet
Cumberland Overthrust Block
Looking Northeast From Birch Knob of Pine Mountain
Photograph by Roddy Addington - © All Rights Reserved.

May 12, 2012
Majestic Morning Sunrise Illuminates The Cumberlands
Photograph by Roddy Addington - © All Rights Reserved.

Observe the fog bank over John Flannagan Lake along the southeast side of Pine Mountain.

May 12, 2012
Glory Of The Rising Sun
Photograph by Roddy Addington - © All Rights Reserved.

Can you count the number of ridges in this next view?

May 12, 2012
View from Pine Mountain
Along The Rugged Virginia-Kentucky Border
Photograph by Roddy Addington - © All Rights Reserved.


Another awesome set of scenes by my friend and photographer Roddy Addington who recently took First Place and Best of Show in the 2012 Photography Contest at Cumberland Falls.
Way to go Rod!


Another Rescue

May 5, 2012
American Redstart ( Setophaga ruticilla )
Photograph by Wayne Riner - © All Rights Reserved.

Amazingly, yet another bird that crashed into the windows of my friends Wayne & Genevie Riner was saved and photographed before it flew away into the wilds.

Under birds in the Ecology-Biodiversity section of 
The High Knob Landform I have four great photographs taken by Wayne & Genevie of "birds in the hand."  Amazingly, as noted, all were saved and flew away!  Note how TINY warblers are as illustrated by this American Redstart photograph!

May 1, 2012
The Art of Camouflage
Eastern Fence Lizard ( Sceloporus undulatus )
Photograph by Wayne Riner - © All Rights Reserved.

Wayne Riner Photograph Thoughts...
"This fence lizard has picked the ideal place to wait on tasty ants that may come by."


Green Up & Geology Notes

May 2, 2012
Looking S-SW from "Airplane Rock"
Hazy Summer-like Conditions Open May 2012
Photograph by Roddy Addington - © All Rights Reserved.

Atypically hazy & hot conditions for early May started the month off like summer time, reducing visibilities greatly upon looking southward across the Cumberland Overthrust Block from majestic Birch Knob of Pine Mountain.

The High Knob Massif being barely visible capping the far horizon across right-center of photograph.

May 2, 2012
Mountain Greenery from Pine Mountain
Photograph by Roddy Addington - © All Rights Reserved.

While coming earlier than usual, green up followed the typical trends with fastest emergence and maturation of vegetation across the foothills of eastern Kentucky, far southwestern portions of the High Knob Landform ( Cumberland Gap to Norris Lake section ), and thermal belt locations featuring milder nocturnal temperatures.

Reference the following for a nice overview of how a combination of elevation + latitude differences across the High Knob Landform = huge variations in spring emergence:


Clicking consecutively on the next two photographs by Roddy will illustrate the changing geology upon looking from the Pine Mountain Anticline ( and Pine Mountain crestline ) to the Middlesboro Syncline.

Russell Fork Basin
The Ohio River Watershed
From Anticline to Syncline & Fault Zone
Photograph by Roddy Addington - © All Rights Reserved.

Same Photograph With Illustration Of Geology
Photograph by Roddy Addington - © All Rights Reserved.

Open fields of the Adam Childress Farm rest near the base of Pine Mountain and just northwest of the axis of the geological Middlesboro Syncline which, northeast of the Black Mountains, runs nearly parallel with the Pound River Valley across northern Wise & Dickenson counties.

The natural topographic separation of mountain ridges visible 
in the distance marks the Clintwood-Coeburn Fault Zone that stretches from Pine Mountain south to near Guest River and the northeastern base of the High Knob Massif in Coeburn.

The USGS named Coeburn Fault is east of the Glamorgan Fault that forms the nearly straight, north to south running Indian Creek Valley in Wise County ( the Glamorgan Fault ends amid northern slopes of the High Knob Massif in Clear Creek Basin just south of the Ramsey community ).

Russell Fork Basin of the Big Sandy watershed of the Ohio River is largely a topographic and geologic basin with both terrain & stratigraphy that dip toward the axis of the Middlesboro Syncline.

This fact combined with lofty terrain of the High Knob Landform, Black Mountains, and associated Tennessee Valley Divide acts to dictate the climate of the Russell Fork Basin ( and therefore its biological diversity and geomorphology ).

  Meteorologists would be doing well to understand the geology of this region since both topography and climatology are intimately related!

The Great Cumberland Overthrust Block
Beauty Of Spring Skies Above The Cumberlands
Photograph by Roddy Addington - © All Rights Reserved.

This is particularly true in the Cumberland Block where formation of the massive Powell Valley Anticline of the High Knob Landform forced development of the Middlesboro Syncline and many associated faults & folds.

The Middlesboro Syncline being un-syncline-like in topographic character amid the coal rich Black Mountains which represent some of the most maturely dissected terrain in the Appalachians with deep erosion of multi-layered sequences of shales, coal, and siltstones beneath more resistant ridge forming sandstones.

The High Knob Massif - Black Mountain corridor is not only the wettest amid the Cumberland Block but also the wettest in both Virginia & Kentucky over the longer term.  That did not happen by mere chance, or recently, as development of extreme topography and biodiversity over time has been shaped by a long history of wetness in the mean.

A simply wonderful realization since the entire southern Appalachian landscape is intimately connected with relationships as just described.

May 16, 2012
Viewed from Lonesome Pine Airport
The Gorgeous Colors of Spring 2012
Photograph by Roddy Addington - © All Rights Reserved.

Wow, what a way to close this update!


Friday, April 20, 2012

Mid-Spring 2012 - Precious Water Supplies


Spring In The Southern Appalachians
Splendor of Dogwoods ( Cornus florida )
Photograph by Wayne Browning - © All Rights Reserved.


Do without running water for just 24-hours and suddenly the true value of this most precious commodity begins to be realized.

Go weeks, months, even years without dependable water supplies like nearly a billion people across Earth and it becomes priceless!


To put it bluntly, you will die without clean water.  A person can live for weeks without food, but not water!

As the climate of Earth changes there is nothing more precious than fresh water, making water production & supply locations like the great High Knob Landform more important to your life and the lives of your loved ones than ever before.

The High Knob Massif area is the wettest in Virginia, making water extra special here ( # ).

#Water here tends to be so abundant IN THE MEAN that 
it is taken for granted until something comes along to shake things up, like drought years of 1988, 1999, and 2007 or the man-made water crisis of 2005 when Big Cherry Lake was drained to build the new Dam ( which increased holding capacity by 37% ).

City of Norton WP
Driest Years On Record

1988: 45.75" ( M )

1999: 42.44"

2007: 39.69"
( Driest year on record in Norton & High Knob Massif )

( M ) - Indicates some missing moisture in winter snowfall.

Precipitation totals ( based upon automated & storage gages ) in 2007 reached a general 45.00" to 50.00" in the Eagle Knob to Big Cherry Dam and Maple Gap sections of the High Knob Massif.

Heavy Morning Dew of Moist Atmosphere
Orange-Spotted Jewelweed ( Impatiens capensis )
Photograph by Wayne Browning - © All Rights Reserved.


( High Knob Massif )
Big Cherry Dam
Updated Monthly Precipitation Totals
Observers: Gary Hampton & Staff of Big Stone Gap WP
( Elevation: 3120 feet )

2008
November:  4.36"
December: 8.49"

2009
January: 9.23"
February: 4.36"
March: 5.51"
April: 5.40"
May: 7.07"
June: 5.44"
July: 8.42"
August: 7.08"
September: 9.09"
October: 4.36"
November: 3.88"
*December: 11.50"

2010
*January: 6.25"
*February: 4.25"
*March: 4.50"
April: 3.78"
May: 6.99"
June: 9.53"
July: 4.27"
August: 8.91"
September: 2.88"
October: 2.84"
November: 4.05"
*December: 7.35"

2011
January: 4.51"
February: 4.53"
March: 9.85"
April: 10.08"
May: 5.38"
June: 6.16"
July: 7.18"
August: 4.94"
September: 7.28"
October: 5.05"
November: 8.67"
December: 6.62"

2012
January: 4.70"
February: 5.91"
March: 7.98"

2012 Total: 18.59" ( M )
( At least 0.80" of loss just on the February 19 snow )


Orographic Forcing Season Total
October 2011-March 2012: 38.93" ( M )
( 6.49"+ per month average )

41-Month Total: 258.63" ( M )

41-Month Mean Monthly Precip: 6.31"

Mean Per 12-Month Periods: 75.72" ( M )

( * ) - Indicates that total was estimated or partly estimated due to severe winter conditions.

( M ) - Denotes that total precipitation was greater than rain gage total due to evaporation between hand-measurements ( the mean evaporative loss is estimated to have been 3.00" to 3.50" per year as partly based upon observed losses at Clintwood 1 W ) and loss in falls of snow too deep for the rain gage to physically contain ( 4"-diameter NWS rain gage ).

[ All measurements courtesy of Superintendent Gary Hampton and Staff of the Big Stone Gap Water Plant in South Fork Gorge ].

The 6.31" average per month during the past 41 months is the highest mean ever observed in Virginia over such an extended period of time. 

[ It is less than what fell, despite a few applied estimates due to severe winter conditions, since 88% of these totals are the raw monthly rain gage values and the 5 applied estimates are low and based upon other rain gage readings in the massif area ].

An Early September Scene
Crest Zone of High Knob Massif
On The Cusp of Autumn - Majesty of Big Cherry Basin
Photograph by Wayne Browning - © All Rights Reserved.

1,002,726,000 gallons of water

That is the number of gallons of water that discharged from the Big Cherry Basin and flowed by the Water Plant above East Stone Gap during the October 2011 to March 2012 period of the orographic forcing season!

More than 1 BILLION gallons.

To put the above in better perspective that is enough water to fill:

Appalachia Lake
The Lower Norton Reservoir
The Upper Norton Reservoir

4.5 times.

May 23, 2006
Water Elevation of 3308 feet
Late Spring At The Upper Norton Reservoir
Photograph by Wayne Browning - © All Rights Reserved.

Big Cherry Dam holds back 632.63 Million gallons of water in its 250-acre lake with a mean water elevation of 3120 feet above sea level.

What is not realized by most is that despite 857 Million gallons held on any given day at full capacity by:

Appalachia Lake
Big Cherry Lake
The Lower Norton Reservoir
The Upper Norton Reservoir

water demand in the Wise, Scott, Lee county area is greater than this mountain lake storage.  It is only due to mean wetness, which keeps inflow coming to replace discharge, that there is not a continuous water shortage instead of surplus ( * ).

*These non-water supply mountain lakes are not included in the above calculation:

Bark Camp Lake
High Knob Lake
Rimrock Lake
Keokee Lake

nor are the many wetlands and private ponds in the massif area.

( During A Previous Year )
Water Elevation of 3490 feet
High Knob Lake In Wake Of A Late Spring Freeze
Photograph by Wayne Browning - © All Rights Reserved.

[ High Knob Lake extends well beyond the above view; although, at only 4 acres it is by far the smallest of the five featured lakes upon the massif core ( South Fork Gorge to Guest River Gorge ) ].

The drought year of 1999 was a perfect example to illustrate the above fact.

1999 Precipitation Totals

Norton WP: 42.44"

Norton ES: 42.59"

Head of Powell Valley: 42.59"

Big Stone Gap WWTP: 43.07"

Appalachia Lake WP: 46.81"

More than 50.00" fell in wetter portions of the High Knob Massif during 1999.

Upper Norton Reservoir In Early Autumn of 1999
Photograph by Wayne Browning - © All Rights Reserved.

By comparison, the 100-year annual mean for the state of Virginia during 1910-2010:

42.76" 

Although considered a severe drought year, 1999 precip totals amid the High Knob Massif area were at or above the 100-year mean for Virginia!

This clearly illustrates that local water demand is greater than storage capacity unless there is a mean surplus of inflow into these precious mountain lakes.

Eastern Box Turtle Terrapene carolina carolina )
Photograph by Wayne Browning - © All Rights Reserved.

Another way of looking at this, as my friend above is doing, if local annual precipitation averages were the same as the following sites ( for example ).......

Mean Annual Precipitation Totals
( 1981-2010 Period )

Wytheville: 38.40"

Bluefield ( WV ): 39.62"

Blacksburg: 40.89"

Tri-Cities ( TN ): 41.00"

Roanoke: 41.25"

Lynchburg: 41.57"

Lebanon: 42.90"

Richmond: 43.60"

there would be a continous water supply shortage in locales served by High Knob Massif lakes ( since demand would be greater than inflow ).

That most years feature plenty of water supply is testimony to the mean wetness of the High Knob Massif.

[ Local storage capacity could, of course, be increased but this is based upon current storage capacity of the main mountain top water supply lakes listed above ( the other lakes not included ) ].

High Knob Meadow - Elevation 4200 feet
Looking Upon Grindstone Ridge & Little Stone Mountain
Hazy Spring Afternoon At Head of Big Cherry Basin
Photograph by Wayne Browning - © All Rights Reserved.

A truly outstanding aspect of High Knob Massif lakes is their extraordinary recharge ability, with typically as much or more precipitation in the five to six month orographic forcing season than falls during an entire year upon many places in Virginia ( but there is more to this than just rain gage precipitation, as will be discussed below about rime & fog drip from massif trees ).


Big Cherry Dam
( Hand-Measured Totals )

Orographic Forcing Season Total
November 2010-April 2011: 40.37" ( M )
( 6.06" per month average )

*Orographic Forcing Season Total
October 2011-March 2012: 38.93" ( M )
( 6.49" per month )

*With at least 0.80" of known loss during the February 19 snow the true total, if possible to measure by hand every day, would have easily topped 40.00" ( moisture from the fog drip and rime deposition on trees is not caught by rain gages and not included ).

In the decades that I have studied this area I have never seen lakes fail to recharge to overflow, no matter how low they were before the orographic forcing season began.

Case in point, Autumn 2005 with building of the new Dam at Big Cherry Lake where going into the forcing season there was nothing but a puddle left in the lake!

Autumn of 2005
Big Cherry Lake Drained To Build New Dam
Photograph by D. Buckles - © All Rights Reserved.

I wrote the following in my weather notes for January 17-18, 2006:

"Run-off from heavy rain and snow melt recharged the Big Cherry Lake, which had been drained during the summer of 2005 to construct a new dam, with a 30 foot gain in water levels being observed since the active pattern began during mid-November of 2005."

A vertical water rise of 30 FEET from mid-November 2005 to mid-January 2006, and the regional pattern during this period was considered to be one of continued drought!

[ Some folks believed it would take years to refill Big Cherry Lake, but they did not know the climatology of the High Knob Massif ].

Recharge of lakes in lofty basins of the High Knob Massif is due to more than just falling precipitation, it is enhanced by TREES and the rime deposition & fog drip which arises from them as moist air is forced to flow across its highcountry.






Big Cherry Basin and much of Benges Basin of the dual Norton Reservoir system sit in the rime zone where trees collect cloud vapor in sub-freezing air and drip fog moisture in above freezing air, adding greatly to the annual water budgets of their water supply lakes and enhancing recharge every year!

[ Due to evapotranspiration trees also enhance precipitation. It is a well known and proven fact that annual precipitation drops when trees are cut.  In extreme cases, as history well records
loss of trees result in formation of deserts ].


Big Cherry Basin - Maple Gap
Precipitation Measurement Notes

Crest Zone of High Knob Massif
Looking Across The Basin of Big Cherry Lake
Hazy Summer Afternoon In High Knob Meadow
Photograph by Wayne Browning - © All Rights Reserved.

While it is not possible to hand-measure precip every day in Big Cherry Basin, due to its remote location, the NWS rain gage readings that are taken once a week on average have been very productive and part of an extended period of research in this section of the massif.


I use my official NWS station as a control site for Big Cherry Dam, with it being exactly half as high in elevation at 1560 feet above sea level.  Although evaporation and winds are therefore greater at the Dam, to remain conservative I have used my observed evaporation losses to estimate those at Big Cherry by placing an exact replica of the gage used at the Dam beside of my official 8" diameter NWS gage that is measured daily ( * ).

*The only difference is that it has a storage container attached to the 4"-diameter rain gage which can hold contents for a month or more ( the container has a combination of oil + antifreeze to reduce evaporation and prevent freezing during cold months ).

During a 2-year study period the 4"-diameter NWS rain gage caught and held 6.65" less than the 8"-diameter gage measured daily ( there were 18 hand-measurements of the 4" gage during the 24-month period ), for a mean loss of 3.32" per year.

While the rain gage at Big Cherry Dam is measured every 7 days on average, it contains nothing to help reduce evaporation. 

[ It is also subjected to much deeper falls of snow that result in greater cold season losses than at the control site elevation of 1560 feet where wind speeds are also MUCH less ].

I will begin this year to measure a 4" NWS gage once weekly at the same time as Big Cherry Dam readings are taken to compare it with my 8" NWS gage measured daily ( to study evaporation losses ).

Meanwhile, preliminary data suggests that the 6.31" mean at Big Cherry Dam during the past 41-months is 0.28" less per month than what would have been observed if possible to measure daily with a 8"-diameter NWS gage.

[ The 0.28" value = 6.59" per month mean for 41-months.  If only raw rain gage data is used and no months are accepted with even a partial estimate, a 6.52" per month mean for 36-months is obtained ( i.e., a 3-year average of 78.24" per year ) ].

The bottom line, a general 75" to 80" of total rain gage precipitation has fallen in Big Cherry Basin per year during the past 41-months ( 3.4 years ).

The total water production of the basin has been much greater since it sits amid the rime-cloud zone, with deposition on trees and drip from trees not being measured by standard rain gages.

For additional reading please reference:
( as a few examples from this website )













Notice: 
Spillway Completion Work

October 3, 2003
High In The Sky - Upper Norton Reservoir
Photograph by Wayne Browning - © All Rights Reserved.

The City of Norton will be draining its upper reservoir in June 2012 to complete work on a new spillway.  While PSA and Big Cherry Lake water will supplement the City, conservation is being asked for during the completion of this project. 

For additional information contact The City of Norton: