Supercell over Laramie
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Wyoming Snow Precipitation Update

United States Natural Resources Water and Climate Center Department of Conservation Portland, Oregon Agriculture Service S N O W - P R E C I P I T A T I O N U P D A T E Based on Mountain Data from NRCS SNOTEL Sites As of MONDAY: APRIL 20 , 2009 ----------------------------------------------------------------------------- BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Average Avg Current Average Avg ----------------------------------------------------------------------------- WYOMING SNAKE RIVER BASE CAMP 7030 14.1 15.9 89 21.3 23.3 91 COTTONWOOD CREEK 7670 28.6 23.1 124 34.7 30.3 115 GRAND TARGHEE 9260 49.4 -M * 38.0 -M * GRANITE CREEK 6770 16.0 16.1 99 23.2 21.4 108 GRASSY LAKE 7265 34.0 36.6 93 38.0 39.1 97 GROS VENTRE SUMMIT 8750 -M 14.5 * 17.4 14.3 122 GUNSIGHT PASS 9820 16.6 -M * 17.9 -M * LEWIS LAKE DIVIDE 7850 -M 36.5 * -M 40.0 * PHILLIPS BENCH 8200 30.2 30.7 98 33.0 31.6 104 SALT RIVER SUMMIT 7760 15.9 13.8 115 18.6 20.6 90 SNAKE RIVER STATION 6920 17.3 16.5 105 24.8 24.4 102 SPRING CREEK DIVIDE 9000 31.4 28.8 109 29.9 28.9 103 THUMB DIVIDE 7980 21.2 18.0 118 23.9 20.8 115 TOGWOTEE PASS 9580 30.4 27.1 112 32.6 27.3 119 TWO OCEAN PLATEAU 9240 41.5 31.1 133 32.1 30.4 106 WILLOW CREEK 8380 37.2 31.9 117 43.3 35.6 122 ----- ----- Basin wide percent of average 110 107 UPPER YELLOWSTONE-MADISON BEARTOOTH LAKE 9360 25.1 25.6 98 23.0 22.2 104 BLACK BEAR 8170 38.8 40.9 95 38.9 44.0 88 CANYON 7870 14.4 13.3 108 16.5 16.9 98 FISHER CREEK 9100 38.7 37.3 104 38.5 39.8 97 MADISON PLATEAU 7750 25.0 25.9 97 26.9 29.3 92 NORTHEAST ENTRANCE 7350 9.2 9.9 93 15.0 13.9 108 PARKER PEAK 9400 29.7 23.7 125 20.4 18.2 112 SYLVAN LAKE 8420 21.9 24.1 91 25.5 23.2 110 THUMB DIVIDE 7980 21.2 18.0 118 23.9 20.8 115 TWO OCEAN PLATEAU 9240 41.5 31.1 133 32.1 30.4 106 WHISKEY CREEK 6800 18.5 17.5 106 22.6 23.0 98 WHITE MILL 8700 26.5 26.2 101 26.4 29.6 89 WOLVERINE 7650 11.6 10.2 114 13.6 14.2 96 ----- ----- Basin wide percent of average 106 99 WIND RIVER BURROUGHS CREEK 8750 17.5 14.9 117 18.6 18.1 103 COLD SPRINGS 9630 9.3 6.1 152 12.7 12.5 102 DEER PARK 9700 15.1 17.8 85 20.3 24.8 82 HOBBS PARK 10100 16.9 17.0 99 17.2 15.2 113 LITTLE WARM 9370 13.0 12.2 107 16.5 15.3 108 SOUTH PASS 9040 15.7 17.8 88 17.7 20.9 85 ST. LAWRENCE ALT 8620 8.1 6.8 119 12.1 10.6 114 TOGWOTEE PASS 9580 30.4 27.1 112 32.6 27.3 119 TOWNSEND CREEK 8700 11.7 9.6 122 15.2 13.9 109 ----- ----- Basin wide percent of average 106 103 BIGHORN BASIN BALD MTN. 9380 19.9 22.3 89 16.8 19.6 86 BEAR TRAP MEADOW 8200 7.7 4.0 192 10.5 9.8 107 BLACKWATER 9780 28.2 27.2 104 25.5 23.1 110 BONE SPRINGS DIV 9350 17.0 17.7 96 15.8 16.8 94 EVENING STAR 9200 31.9 32.4 98 33.9 28.2 120 GRAVE SPRINGS 8550 10.3 10.8 95 11.5 11.8 97 KIRWIN 9550 14.9 12.5 119 16.4 12.9 127 MARQUETTE 8760 8.6 10.6 81 10.6 12.0 88 MIDDLE POWDER 7760 12.9 14.2 91 11.6 14.3 81 OWL CREEK 8975 6.4 5.0 128 7.7 7.2 107 POWDER RIVER PASS 9480 13.1 11.7 112 16.1 14.3 113 SHELL CREEK 9580 17.7 16.3 109 17.0 15.3 111 SYLVAN LAKE 8420 21.9 24.1 91 25.5 23.2 110 SYLVAN ROAD 7120 12.0 11.3 106 21.0 19.4 108 TIMBER CREEK 7950 5.6 5.5 102 9.6 9.0 107 YOUNTS PEAK 8350 19.8 18.2 109 17.7 17.8 99 ----- ----- Basin wide percent of average 102 105 SHOSHONE RIVER BLACKWATER 9780 28.2 27.2 104 25.5 23.1 110 EVENING STAR 9200 31.9 32.4 98 33.9 28.2 120 KIRWIN 9550 14.9 12.5 119 16.4 12.9 127 MARQUETTE 8760 8.6 10.6 81 10.6 12.0 88 SYLVAN LAKE 8420 21.9 24.1 91 25.5 23.2 110 SYLVAN ROAD 7120 12.0 11.3 106 21.0 19.4 108 YOUNTS PEAK 8350 19.8 18.2 109 17.7 17.8 99 ----- ----- Basin wide percent of average 101 110 POWDER-TONGUE BEAR TRAP MEADOW 8200 7.7 4.0 192 10.5 9.8 107 BIG GOOSE 7990 11.9 12.5 95 14.8 11.2 132 BONE SPRINGS DIV 9350 17.0 17.7 96 15.8 16.8 94 BURGESS JUNCTION 7880 13.6 13.3 102 14.5 14.0 104 CLOUD PEAK RESERVOIR 9860 19.8 15.6 127 19.2 15.2 126 DOME LAKE 8880 14.1 13.8 102 17.5 15.2 115 GRAVE SPRINGS 8550 10.3 10.8 95 11.5 11.8 97 HANSEN SAWMILL 8360 6.9 5.7 121 11.5 9.7 119 MIDDLE POWDER 7760 12.9 14.2 91 11.6 14.3 81 POWDER RIVER PASS 9480 13.1 11.7 112 16.1 14.3 113 SUCKER CREEK 8880 16.4 13.4 122 19.0 15.7 121 TIE CREEK 6870 6.6 5.3 125 16.2 11.9 136 ----- ----- Basin wide percent of average 109 111 BELLE FOURCHE BLIND PARK 6890 3.4 7.0 49 15.8 12.8 123 COLE CANYON 5910 6.8 6.9 99 13.8 8.0 172 NORTH RAPID CREEK 6130 7.6 8.3 92 15.9 9.9 161 ----- ----- Basin wide percent of average 80 148 UPPER N. PLATTE RIVER COLUMBINE 9160 27.1 24.1 112 30.2 27.7 109 DIVIDE PEAK 8880 27.9 20.9 133 30.4 22.9 133 ELK RIVER 8700 23.7 19.0 125 24.6 21.7 113 JOE WRIGHT 10120 26.5 24.1 110 32.3 27.9 116 NORTH FRENCH CREEK 10130 38.3 33.3 115 35.6 27.6 129 OLD BATTLE 10000 38.9 35.3 110 44.0 37.8 116 SAGE CREEK BASIN 7850 15.8 12.1 131 17.0 13.3 128 SOUTH BRUSH CREEK 8440 13.7 13.0 105 19.8 18.6 106 TOWER 10500 48.5 50.4 96 45.0 42.6 106 WEBBER SPRINGS 9250 29.4 26.0 113 33.6 29.5 114 WILLOW CREEK PASS 9540 14.7 14.0 105 14.6 14.5 101 ----- ----- Basin wide percent of average 112 115 LOWER N. PLATTE - SWEETWATER - LARAMIE BROOKLYN LAKE 10240 26.9 27.2 99 25.4 25.0 102 CASPER MTN. 7900 14.8 17.2 86 15.6 17.4 90 DEADMAN HILL 10220 21.4 18.8 114 21.7 19.3 112 DEER PARK 9700 15.1 17.8 85 20.3 24.8 82 LAPRELE CREEK 8375 9.4 9.6 98 15.1 14.8 102 RENO HILL 8400 17.7 16.0 111 19.7 18.0 109 ROACH 9700 19.7 18.5 106 22.3 20.9 107 SAND LAKE 10050 35.5 35.6 100 33.7 27.2 124 SOUTH PASS 9040 15.7 17.8 88 17.7 20.9 85 WINDY PEAK 7900 10.2 7.4 138 12.9 12.2 106 ----- ----- Basin wide percent of average 100 102 LITTLE SNAKE RIVER BATTLE MOUNTAIN 7440 16.7 7.7 217 20.6 17.5 118 DIVIDE PEAK 8880 27.9 20.9 133 30.4 22.9 133 OLD BATTLE 10000 38.9 35.3 110 44.0 37.8 116 SANDSTONE RS 8150 22.1 12.8 173 23.2 20.5 113 WHISKEY PARK 8950 35.9 30.6 117 38.0 31.7 120 ----- ----- Basin wide percent of average 132 120 UPPER GREEN RIVER BIG SANDY OPENING 9080 13.8 15.2 91 14.5 14.8 98 BLIND BULL SUM 8650 30.2 28.8 105 22.8 24.2 94 EAST RIM DIVIDE 7930 9.6 14.0 69 13.7 13.1 105 ELKHART PARK G.S. 9400 15.3 14.0 109 17.0 14.9 114 GROS VENTRE SUMMIT 8750 -M 14.5 * 17.4 14.3 122 GUNSIGHT PASS 9820 16.6 -M * 17.9 -M * KENDALL R.S. 7740 9.5 13.0 73 15.2 15.8 96 LOOMIS PARK 8240 16.7 16.6 101 20.7 19.0 109 NEW FORK LAKE 8340 11.9 10.9 109 12.4 12.5 99 SNIDER BASIN 8060 15.5 14.7 105 17.0 17.7 96 SPRING CREEK DIVIDE 9000 31.4 28.8 109 29.9 28.9 103 TRIPLE PEAK 8500 25.7 25.8 100 29.6 27.2 109 ----- ----- Basin wide percent of average 99 104 LOWER GREEN RIVER HAMS FORK 7840 11.5 9.1 126 14.4 13.7 105 HEWINTA 9519 13.6 11.9 114 15.7 16.6 95 HICKERSON PARK 9145 8.2 7.9 104 11.9 9.3 128 HOLE-IN-ROCK 9150 7.7 6.9 112 11.3 8.8 128 INDIAN CREEK 9425 28.1 29.6 95 25.5 28.1 91 KELLEY R.S. 8180 17.5 16.7 105 20.6 22.4 92 STEEL CREEK PARK 10200 16.1 17.6 91 19.2 18.8 102 ----- ----- Basin wide percent of average 103 101 UPPER BEAR RIVER BUG LAKE 7950 20.7 21.2 98 20.4 21.2 96 HAYDEN FORK 9212 18.6 16.0 116 25.1 23.6 106 KELLEY R.S. 8180 17.5 16.7 105 20.6 22.4 92 LILY LAKE 9156 16.7 14.0 119 19.6 19.8 99 MONTE CRISTO 8960 30.8 30.3 102 30.2 28.4 106 SALT RIVER SUMMIT 7760 15.9 13.8 115 18.6 20.6 90 TRIAL LAKE 9992 28.2 26.5 106 27.1 27.7 98 ----- ----- Basin wide percent of average 107 99 ----------------------------------------------------------------------------- -M = Missing data * = Data may not provide a valid measure of conditions. Units = inches for the Current and Average Snow Water Equivalent and Total Precipitation values If the Basin wide percent of average value is flagged as potentially invalid, care should be taken to evaluate if the value is representative of conditions in the basin. The SNOW WATER EQUIVALENT Percent of Average represents the snow water equivalent found at selected SNOTEL sites in or near the basin compared to the average value for those sites on this day. The TOTAL PRECIPITATION Percent of Average represents the total precipitation (beginning October 1st) found at selected SNOTEL sites in or near the basin compared to the average value for those sites on this day. Contact your state water supply staff for assistance. Reference period for average conditions is 1961-90. Provisional data, subject to revision. ---------------------------------------------------------------------------- -M = Missing data * = Data may not provide a valid measure of conditions. Units = inches for the Current and Normal Snow Water Equivalent and Total Precipitation values If the Basin Index (%) value is flagged as potentially invalid, care should be taken to evaluate if the value is representative of conditions in the basin. The SNOW WATER EQUIVALENT Percent of Median represents the snow water equivalent found at selected SNOTEL sites in or near the basin compared to the Median value for those sites on this day. The TOTAL PRECIPITATION Percent of Average represents the total precipitation (beginning October 1st) found at selected SNOTEL sites in or near the basin compared to the Average value for those sites on this day. Contact your state water supply staff for assistance. Medians and averages are calculated for the period 1981-2010. Provisional data, subject to revision. * Site -- Either: (a) the current value is missing; (b) the median or average for the day is not available or is zero; or (c) for snow water equivalent, the median for the day is less than 10% of the maximum median value for the year. * Basin - More than half of the sites within the basin are flagged with *, preventing the calculation of a meaningful basin index. The basin index is calculated as the sum of the valid current values divided by the sum of the corresponding medians (for snow water equivalent) or averages (for precipitation) and the resulting fraction multiplied by 100.