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: MAY 18 , 2009 ----------------------------------------------------------------------------- BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Average Avg Current Average Avg ----------------------------------------------------------------------------- WYOMING SNAKE RIVER BASE CAMP 7030 1.0 5.6 18 24.3 25.8 94 COTTONWOOD CREEK 7670 18.6 13.0 143 38.5 34.1 113 GRAND TARGHEE 9260 45.4 -M * 42.5 -M * GRANITE CREEK 6770 4.1 7.1 58 25.6 23.7 108 GRASSY LAKE 7265 22.1 25.3 87 43.2 43.1 100 GROS VENTRE SUMMIT 8750 9.1 9.2 99 19.4 16.5 118 GUNSIGHT PASS 9820 16.8 -M * 20.9 -M * LEWIS LAKE DIVIDE 7850 32.4 27.9 116 42.1 43.7 96 PHILLIPS BENCH 8200 25.2 23.1 109 36.2 35.0 103 SALT RIVER SUMMIT 7760 4.5 3.9 115 20.2 23.0 88 SNAKE RIVER STATION 6920 2.2 4.7 47 28.8 27.1 106 SPRING CREEK DIVIDE 9000 28.4 23.8 119 32.8 31.8 103 THUMB DIVIDE 7980 13.6 8.8 155 27.6 23.6 117 TOGWOTEE PASS 9580 32.1 27.0 119 36.5 31.0 118 TWO OCEAN PLATEAU 9240 47.5 30.3 157 37.8 34.4 110 WILLOW CREEK 8380 28.5 24.2 118 48.5 40.5 120 ----- ----- Basin wide percent of average 115 107 UPPER YELLOWSTONE-MADISON BEARTOOTH LAKE 9360 27.0 25.2 107 27.5 25.4 108 BLACK BEAR 8170 40.3 35.8 113 45.3 48.3 94 CANYON 7870 11.1 6.3 176 20.2 19.1 106 FISHER CREEK 9100 44.8 36.0 124 45.1 44.4 102 MADISON PLATEAU 7750 22.1 18.6 119 32.1 32.4 99 NORTHEAST ENTRANCE 7350 .0 2.6 0 17.9 16.2 110 PARKER PEAK 9400 30.6 23.7 129 24.5 21.5 114 SYLVAN LAKE 8420 20.7 19.6 106 30.6 26.9 114 THUMB DIVIDE 7980 13.6 8.8 155 27.6 23.6 117 TWO OCEAN PLATEAU 9240 47.5 30.3 157 37.8 34.4 110 WHISKEY CREEK 6800 13.9 8.7 160 26.6 25.8 103 WHITE MILL 8700 29.3 24.2 121 31.7 33.3 95 WOLVERINE 7650 .5 2.4 21 17.2 16.9 102 ----- ----- Basin wide percent of average 124 104 WIND RIVER BURROUGHS CREEK 8750 15.9 9.9 161 21.8 21.1 103 COLD SPRINGS 9630 1.6 2.9 55 15.7 15.7 100 DEER PARK 9700 11.7 16.7 70 23.1 29.1 79 HOBBS PARK 10100 15.9 16.3 98 21.0 19.2 109 LITTLE WARM 9370 8.4 7.1 118 19.8 18.6 106 SOUTH PASS 9040 9.4 13.0 72 20.0 24.7 81 ST. LAWRENCE ALT 8620 .1 3.1 3 14.6 13.9 105 TOGWOTEE PASS 9580 32.1 27.0 119 36.5 31.0 118 TOWNSEND CREEK 8700 3.8 5.2 73 17.3 17.4 99 ----- ----- Basin wide percent of average 98 100 BIGHORN BASIN BALD MTN. 9380 21.5 22.7 95 20.0 23.6 85 BEAR TRAP MEADOW 8200 .1 .4 25 12.5 12.7 98 BLACKWATER 9780 33.1 28.7 115 31.0 26.9 115 BONE SPRINGS DIV 9350 17.8 15.7 113 19.0 20.5 93 EVENING STAR 9200 32.1 32.0 100 39.9 32.3 124 GRAVE SPRINGS 8550 5.2 6.7 78 12.5 14.8 84 KIRWIN 9550 12.7 10.6 120 19.9 16.0 124 MARQUETTE 8760 6.4 8.4 76 13.6 16.0 85 MIDDLE POWDER 7760 8.4 10.1 83 13.3 17.7 75 OWL CREEK 8975 .1 2.0 5 10.3 9.7 106 POWDER RIVER PASS 9480 11.0 7.4 149 19.5 17.9 109 SHELL CREEK 9580 19.1 16.0 119 20.3 18.9 107 SYLVAN LAKE 8420 20.7 19.6 106 30.6 26.9 114 SYLVAN ROAD 7120 .2 2.3 9 25.3 22.0 115 TIMBER CREEK 7950 .2 2.0 10 12.0 12.6 95 YOUNTS PEAK 8350 18.7 14.6 128 20.8 20.5 101 ----- ----- Basin wide percent of average 104 104 SHOSHONE RIVER BLACKWATER 9780 33.1 28.7 115 31.0 26.9 115 EVENING STAR 9200 32.1 32.0 100 39.9 32.3 124 KIRWIN 9550 12.7 10.6 120 19.9 16.0 124 MARQUETTE 8760 6.4 8.4 76 13.6 16.0 85 SYLVAN LAKE 8420 20.7 19.6 106 30.6 26.9 114 SYLVAN ROAD 7120 .2 2.3 9 25.3 22.0 115 YOUNTS PEAK 8350 18.7 14.6 128 20.8 20.5 101 ----- ----- Basin wide percent of average 107 113 POWDER-TONGUE BEAR TRAP MEADOW 8200 .1 .4 25 12.5 12.7 98 BIG GOOSE 7990 8.0 8.7 92 16.6 15.0 111 BONE SPRINGS DIV 9350 17.8 15.7 113 19.0 20.5 93 BURGESS JUNCTION 7880 10.7 9.3 115 16.1 17.2 94 CLOUD PEAK RESERVOIR 9860 18.2 14.3 127 21.9 19.7 111 DOME LAKE 8880 8.5 9.6 89 19.8 19.0 104 GRAVE SPRINGS 8550 5.2 6.7 78 12.5 14.8 84 HANSEN SAWMILL 8360 -M 1.8 * 13.3 12.6 106 MIDDLE POWDER 7760 8.4 10.1 83 13.3 17.7 75 POWDER RIVER PASS 9480 11.0 7.4 149 19.5 17.9 109 SUCKER CREEK 8880 13.4 9.4 143 21.6 19.8 109 TIE CREEK 6870 .0 1.2 0 17.7 15.6 113 ----- ----- Basin wide percent of average 109 101 BELLE FOURCHE BLIND PARK 6890 -M .0 * 18.1 16.2 112 COLE CANYON 5910 .2 .5 40 15.6 11.4 137 NORTH RAPID CREEK 6130 .0 .4 0 17.6 12.9 136 ----- ----- Basin wide percent of average 22 127 UPPER N. PLATTE RIVER COLUMBINE 9160 1.0 11.7 9 33.2 30.9 107 DIVIDE PEAK 8880 13.8 11.6 119 33.4 26.1 128 ELK RIVER 8700 .1 6.5 2 25.4 24.7 103 JOE WRIGHT 10120 21.1 23.4 90 34.9 32.8 106 NORTH FRENCH CREEK 10130 -M 32.6 * -M 32.3 * OLD BATTLE 10000 37.2 34.7 107 47.4 42.4 112 SAGE CREEK BASIN 7850 .0 6.7 0 19.4 15.1 128 SOUTH BRUSH CREEK 8440 .0 5.8 0 22.8 22.1 103 TOWER 10500 46.3 51.0 91 50.9 48.0 106 WEBBER SPRINGS 9250 14.5 16.7 87 35.8 33.2 108 WILLOW CREEK PASS 9540 6.4 10.4 62 16.1 17.3 93 ----- ----- Basin wide percent of average 79 109 LOWER N. PLATTE - SWEETWATER - LARAMIE BROOKLYN LAKE 10240 18.1 21.9 83 28.4 29.4 97 CASPER MTN. 7900 7.0 10.7 65 17.4 22.1 79 DEADMAN HILL 10220 17.8 17.5 102 23.7 23.1 103 DEER PARK 9700 11.7 16.7 70 23.1 29.1 79 LAPRELE CREEK 8375 .6 3.1 19 16.8 18.5 91 RENO HILL 8400 9.0 8.8 102 21.6 22.8 95 ROACH 9700 9.3 12.5 74 24.2 24.6 98 SAND LAKE 10050 33.1 34.9 95 37.0 32.2 115 SOUTH PASS 9040 9.4 13.0 72 20.0 24.7 81 WINDY PEAK 7900 .7 1.4 50 15.9 15.4 103 ----- ----- Basin wide percent of average 83 94 LITTLE SNAKE RIVER BATTLE MOUNTAIN 7440 .0 .0 100 22.9 19.9 115 DIVIDE PEAK 8880 13.8 11.6 119 33.4 26.1 128 OLD BATTLE 10000 37.2 34.7 107 47.4 42.4 112 SANDSTONE RS 8150 .0 3.1 0 25.3 23.6 107 WHISKEY PARK 8950 -M 25.4 * 40.7 36.2 112 ----- ----- Basin wide percent of average 103 115 UPPER GREEN RIVER BIG SANDY OPENING 9080 5.8 8.2 71 16.8 17.4 97 BLIND BULL SUM 8650 30.3 24.3 125 25.6 26.8 96 EAST RIM DIVIDE 7930 .0 8.4 0 14.8 15.0 99 ELKHART PARK G.S. 9400 10.8 8.8 123 19.0 17.6 108 GROS VENTRE SUMMIT 8750 9.1 9.2 99 19.4 16.5 118 GUNSIGHT PASS 9820 16.8 -M * 20.9 -M * KENDALL R.S. 7740 .1 2.7 4 17.4 17.7 98 LOOMIS PARK 8240 5.2 8.9 58 22.3 21.3 105 NEW FORK LAKE 8340 .3 3.1 10 15.1 14.7 103 SNIDER BASIN 8060 3.1 6.8 46 18.0 19.6 92 SPRING CREEK DIVIDE 9000 28.4 23.8 119 32.8 31.8 103 TRIPLE PEAK 8500 16.6 15.8 105 33.7 30.5 110 ----- ----- Basin wide percent of average 91 103 LOWER GREEN RIVER HAMS FORK 7840 .1 .4 25 16.0 16.0 100 HEWINTA 9519 .0 3.8 0 17.3 19.2 90 HICKERSON PARK 9145 .0 1.6 0 13.4 11.5 117 HOLE-IN-ROCK 9150 .0 1.4 0 12.8 11.1 115 INDIAN CREEK 9425 -M 22.9 * 27.5 31.2 88 KELLEY R.S. 8180 7.1 8.2 87 22.1 25.0 88 STEEL CREEK PARK 10200 -M 17.6 * 21.0 21.8 96 ----- ----- Basin wide percent of average 47 96 UPPER BEAR RIVER BUG LAKE 7950 7.1 9.7 73 22.0 23.9 92 HAYDEN FORK 9212 .0 6.5 0 27.3 27.0 101 KELLEY R.S. 8180 7.1 8.2 87 22.1 25.0 88 LILY LAKE 9156 .0 5.6 0 21.5 22.8 94 MONTE CRISTO 8960 16.4 21.6 76 32.0 32.5 98 SALT RIVER SUMMIT 7760 4.5 3.9 115 20.2 23.0 88 TRIAL LAKE 9992 14.2 22.4 63 29.7 31.6 94 ----- ----- Basin wide percent of average 63 94 ----------------------------------------------------------------------------- -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.