Hydrologic Summary of December 7-8 Storm

...MAJOR WINTER STORM BRINGS MUCH NEEDED PRECIPITATION TO EASTERN UTAH AND WESTERN COLORADO...

ON MONDAY AND TUESDAY, DECEMBER 7-8 2009, A STRONG STORM SYSTEM PRODUCED SIGNIFICANT SNOWFALL OVER MUCH OF WESTERN COLORADO AND EASTERN UTAH. MUCH OF THIS AREA HAS BEEN EXPERIENCING ABNORMALLY DRY CONDITIONS IN RECENT MONTHS WITH SOUTHEASTERN UTAH AND SOUTHWESTERN COLODADO EXPERIENCING MODERATE DROUGHT CONDITIONS. ALTHOUGH MANY AREAS STILL HAVE A PRECIPITATION DEFICIT FOR THIS YEAR DUE TO A DRIER THAN NORMAL MONSOON SEASON AND A DRY AUTUMN, THIS STORM SYSTEM HAS NONETHELESS HELPED TO REPLENISH MOUNTAIN SNOWPACK AND SOIL MOISTURE.

BEFORE THIS STORM, SNOW PACK AS A PERCENTAGE OF NORMAL FOR THE MAJOR RIVER BASINS IN WESTERN COLORADO AND EASTERN UTAH WAS:

IN COLORADO: 

GUNNISON RIVER BASIN             56 PERCENT
UPPER COLORADO RIVER BASIN       64 PERCENT
YAMPA AND WHITE RIVER BASINS 55 PERCENT
SAN MIGUEL/DOLORES/
ANIMAS/SAN JUAN RIVER BASINS
48 PERCENT


IN UTAH:

DUCHESNE RIVER BASIN  40 PERCENT

AFTER THIS STORM, SNOW PACK AS A PERCENTAGE OF NORMAL FOR THE MAJOR RIVER BASINS IN WESTERN COLORADO AND EASTERN UTAH WAS:

IN COLORADO:
GUNNISON RIVER BASIN             75 PERCENT
UPPER COLORADO RIVER BASIN       76 PERCENT
YAMPA AND WHITE RIVER BASINS 76 PERCENT
SAN MIGUEL/DOLORES/
ANIMAS/SAN JUAN RIVER BASINS
82 PERCENT


IN UTAH:

DUCHESNE RIVER BASIN  51 PERCENT

STORM TOTAL SNOWFALL AND SNOW WATER EQUIVALENT (SWE)

STORM TOTAL SNOWFALL AND SNOW WATER EQUIVALENT FOR SELECTED AUTOMATED SITES IN THE MOUNTAINS OF WESTERN COLORADO AND EASTERN UTAH WERE:

IN WESTERN COLORADO:

FLAT TOPS: 

LOCATION SNOWFALL(in) SWE(in)
TRAPPER LAKE 6 0.5

GRAND MESA: 
LOCATION SNOWFALL(in) SWE(in)
MESA LAKES 24 1.5
OVERLAND RESERVOIR 24 1.8


UNCOMPAHGRE PLATEAU:
LOCATION SNOWFALL(IN) SWE(IN)
COLUMBINE PASS 24 1.7

HOLLY CROSS WILDERNESS:
LOCATION SNOWFALL(IN) SWE(IN)
BEAVER CREEK VILLAGE 6 0.5


HUNTER-FRYING PAN WILDERNESS:
LOCATION SNOWFALL(IN) SWE(IN)
KILN 6 0.5
IVANHOE 4 0.2
CHAPMAN TUNNEL 4 0.3
INDEPENDENCE PASS 9 0.8


SAN JUAN MOUNTAINS:
LOCATION SNOWFALL(IN) SWE(IN)
LONE CONE 23 1.9
 MOLAS LAKE 19 2.2
 SLUMGULLION 13 1.3
RED MOUNTAIN PASS 20 2.4
LIZARD HEAD PASS 21 1.9
BEARTOWN 28 2.7
VALLECITO 28 2.8
COLUMBUS BASIN 35 3.3
SHARKSTOOTH 30 2.9


IN EASTERN UTAH:

EASTERN UINTAH MOUNTAINS:
LOCATION SNOWFALL(IN) SWE(IN)
TROUT CREEK 15 1.4

EAST TAVAPUTS PLATEAU:
LOCATION SNOWFALL(IN) SWE(IN)
EAST WILLOW CREEK 16 1.3

LA SAL MOUNTAINS:

LOCATION SNOWFALL(IN) SWE(IN)
LA SAL MOUNTAIN 17 1.7


ABAJO MOUNTAINS:
LOCATION SNOWFALL(IN) SWE(IN)
CAMP JACKSON 26 2.9

THE NATIONAL WEATHER SERVICE GRAND JUNCTION FORECAST OFFICE AND COOPERATING AGENCIES WILL BE EVALUATING THE EXTENT TO WHICH THIS PAST STORM HAS ALLEVIATED THE ABNORMALLY DRY AND DROUGHT CONDITIONS IN WESTERN COLORADO AND EASTERN UTAH.  IT IS STILL EARLY IN THE SNOW SEASON AND THE FREQUENCY, TRACK, AND INTENSITY OF SUBSEQUENT WINTER STORMS WILL ULTIMATELY DETERMINE HOW MUCH SNOW WILL ACCUMULATE IN THE MOUNTAINS AND THE CORRESPONDING WATER SUPPLY FROM THE SPRING 2010 RUNOFF.

THE NATIONAL WEATHER SERVICE GRAND JUNCTION FORECAST OFFICE WILL BEGIN ISSUING WATER SUPPLY OUTLOOKS IN FEBRUARY 2010.

ADDITIONAL INFORMATION CAN BE FOUND ON THE NATIONAL WEATHER SERVICE GRAND JUNCTION HOMEPAGE AT HTTP://WWW.WEATHER.GOV/GJT.

NWS GJT SERVICE HYDROLOGIST



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