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 SUNDAY: MAY 17 , 2009 ----------------------------------------------------------------------------- BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Average Avg Current Average Avg ----------------------------------------------------------------------------- WYOMING SNAKE RIVER BASE CAMP 7030 2.3 6.1 38 24.3 25.7 95 COTTONWOOD CREEK 7670 19.9 13.4 149 38.5 34.0 113 GRAND TARGHEE 9260 48.5 -M * 42.5 -M * GRANITE CREEK 6770 5.1 7.5 68 25.6 23.6 108 GRASSY LAKE 7265 23.6 25.9 91 43.1 43.0 100 GROS VENTRE SUMMIT 8750 10.0 9.6 104 19.4 16.5 118 GUNSIGHT PASS 9820 17.5 -M * 20.9 -M * LEWIS LAKE DIVIDE 7850 34.0 28.4 120 42.1 43.6 97 PHILLIPS BENCH 8200 26.2 23.6 111 36.2 34.9 104 SALT RIVER SUMMIT 7760 6.0 4.4 136 20.4 22.9 89 SNAKE RIVER STATION 6920 4.0 5.2 77 28.9 27.0 107 SPRING CREEK DIVIDE 9000 29.5 24.2 122 32.8 31.7 103 THUMB DIVIDE 7980 15.1 9.3 162 27.5 23.5 117 TOGWOTEE PASS 9580 32.8 27.2 121 36.5 30.9 118 TWO OCEAN PLATEAU 9240 48.4 30.5 159 37.8 34.2 111 WILLOW CREEK 8380 29.8 24.7 121 48.5 40.3 120 ----- ----- Basin wide percent of average 119 107 UPPER YELLOWSTONE-MADISON BEARTOOTH LAKE 9360 27.6 25.4 109 27.5 25.3 109 BLACK BEAR 8170 41.5 36.1 115 45.3 48.2 94 CANYON 7870 12.3 6.8 181 20.3 19.1 106 FISHER CREEK 9100 45.6 36.3 126 45.0 44.3 102 MADISON PLATEAU 7750 23.1 19.1 121 32.2 32.2 100 NORTHEAST ENTRANCE 7350 .0 2.9 0 17.9 16.1 111 PARKER PEAK 9400 31.6 23.8 133 24.5 21.3 115 SYLVAN LAKE 8420 21.8 20.0 109 30.6 26.7 115 THUMB DIVIDE 7980 15.1 9.3 162 27.5 23.5 117 TWO OCEAN PLATEAU 9240 48.4 30.5 159 37.8 34.2 111 WHISKEY CREEK 6800 14.9 9.3 160 26.7 25.7 104 WHITE MILL 8700 30.0 24.4 123 31.7 33.2 95 WOLVERINE 7650 1.4 2.8 50 17.2 16.8 102 ----- ----- Basin wide percent of average 127 105 WIND RIVER BURROUGHS CREEK 8750 16.7 10.1 165 21.9 21.0 104 COLD SPRINGS 9630 3.1 3.1 100 15.7 15.6 101 DEER PARK 9700 12.4 17.0 73 23.1 29.0 80 HOBBS PARK 10100 16.5 16.4 101 20.9 19.1 109 LITTLE WARM 9370 9.4 7.4 127 19.8 18.5 107 SOUTH PASS 9040 10.3 13.6 76 20.0 24.6 81 ST. LAWRENCE ALT 8620 -M 3.4 * 14.6 13.8 106 TOGWOTEE PASS 9580 32.8 27.2 121 36.5 30.9 118 TOWNSEND CREEK 8700 5.0 5.4 93 17.3 17.3 100 ----- ----- Basin wide percent of average 106 100 BIGHORN BASIN BALD MTN. 9380 22.0 22.8 96 19.9 23.5 85 BEAR TRAP MEADOW 8200 .2 .6 33 12.5 12.6 99 BLACKWATER 9780 33.4 28.8 116 30.9 26.8 115 BONE SPRINGS DIV 9350 18.4 16.0 115 19.0 20.4 93 EVENING STAR 9200 33.6 32.2 104 40.0 32.1 125 GRAVE SPRINGS 8550 6.1 7.3 84 12.5 14.7 85 KIRWIN 9550 13.5 10.8 125 19.9 15.9 125 MARQUETTE 8760 7.2 8.7 83 13.6 15.9 86 MIDDLE POWDER 7760 9.5 10.6 90 13.4 17.6 76 OWL CREEK 8975 .1 2.1 5 10.3 9.6 107 POWDER RIVER PASS 9480 11.9 7.8 153 19.5 17.8 110 SHELL CREEK 9580 19.4 16.1 120 20.4 18.8 109 SYLVAN LAKE 8420 21.8 20.0 109 30.6 26.7 115 SYLVAN ROAD 7120 .2 2.5 8 25.4 21.9 116 TIMBER CREEK 7950 .3 2.1 14 12.0 12.5 96 YOUNTS PEAK 8350 19.4 15.0 129 20.8 20.4 102 ----- ----- Basin wide percent of average 107 104 SHOSHONE RIVER BLACKWATER 9780 33.4 28.8 116 30.9 26.8 115 EVENING STAR 9200 33.6 32.2 104 40.0 32.1 125 KIRWIN 9550 13.5 10.8 125 19.9 15.9 125 MARQUETTE 8760 7.2 8.7 83 13.6 15.9 86 SYLVAN LAKE 8420 21.8 20.0 109 30.6 26.7 115 SYLVAN ROAD 7120 .2 2.5 8 25.4 21.9 116 YOUNTS PEAK 8350 19.4 15.0 129 20.8 20.4 102 ----- ----- Basin wide percent of average 109 113 POWDER-TONGUE BEAR TRAP MEADOW 8200 .2 .6 33 12.5 12.6 99 BIG GOOSE 7990 8.8 8.9 99 16.6 14.9 111 BONE SPRINGS DIV 9350 18.4 16.0 115 19.0 20.4 93 BURGESS JUNCTION 7880 11.3 9.7 116 16.1 17.1 94 CLOUD PEAK RESERVOIR 9860 18.9 14.6 129 21.9 19.5 112 DOME LAKE 8880 9.5 10.0 95 19.8 18.9 105 GRAVE SPRINGS 8550 6.1 7.3 84 12.5 14.7 85 HANSEN SAWMILL 8360 -M 1.9 * 13.2 12.5 106 MIDDLE POWDER 7760 9.5 10.6 90 13.4 17.6 76 POWDER RIVER PASS 9480 11.9 7.8 153 19.5 17.8 110 SUCKER CREEK 8880 14.2 9.8 145 21.5 19.7 109 TIE CREEK 6870 .0 1.2 0 17.7 15.5 114 ----- ----- Basin wide percent of average 113 101 BELLE FOURCHE BLIND PARK 6890 -M .0 * 18.1 16.0 113 COLE CANYON 5910 .1 .7 14 15.4 11.3 136 NORTH RAPID CREEK 6130 .0 .5 0 17.5 12.8 137 ----- ----- Basin wide percent of average 8 127 UPPER N. PLATTE RIVER COLUMBINE 9160 2.8 12.4 23 33.1 30.8 107 DIVIDE PEAK 8880 15.5 12.2 127 33.4 26.0 128 ELK RIVER 8700 .1 7.0 1 25.4 24.6 103 JOE WRIGHT 10120 21.8 23.6 92 34.9 32.6 107 NORTH FRENCH CREEK 10130 35.7 32.9 109 39.7 32.2 123 OLD BATTLE 10000 37.6 35.1 107 47.4 42.3 112 SAGE CREEK BASIN 7850 .0 7.1 0 19.4 15.1 128 SOUTH BRUSH CREEK 8440 .0 6.2 0 22.8 22.0 104 TOWER 10500 47.2 51.3 92 50.9 47.9 106 WEBBER SPRINGS 9250 15.4 17.4 89 35.8 33.1 108 WILLOW CREEK PASS 9540 7.4 10.8 69 16.1 17.2 94 ----- ----- Basin wide percent of average 85 111 LOWER N. PLATTE - SWEETWATER - LARAMIE BROOKLYN LAKE 10240 19.3 22.5 86 28.4 29.3 97 CASPER MTN. 7900 8.2 11.2 73 17.5 22.0 80 DEADMAN HILL 10220 18.3 17.8 103 23.8 23.0 103 DEER PARK 9700 12.4 17.0 73 23.1 29.0 80 LAPRELE CREEK 8375 1.5 3.4 44 16.9 18.4 92 RENO HILL 8400 9.8 9.2 107 21.5 22.7 95 ROACH 9700 10.4 13.0 80 24.2 24.5 99 SAND LAKE 10050 33.8 35.2 96 37.0 32.0 116 SOUTH PASS 9040 10.3 13.6 76 20.0 24.6 81 WINDY PEAK 7900 .7 1.5 47 15.5 15.3 101 ----- ----- Basin wide percent of average 86 95 LITTLE SNAKE RIVER BATTLE MOUNTAIN 7440 .0 .3 0 22.9 19.9 115 DIVIDE PEAK 8880 15.5 12.2 127 33.4 26.0 128 OLD BATTLE 10000 37.6 35.1 107 47.4 42.3 112 SANDSTONE RS 8150 .0 3.4 0 25.4 23.5 108 WHISKEY PARK 8950 25.7 26.0 99 40.7 36.1 113 ----- ----- Basin wide percent of average 102 115 UPPER GREEN RIVER BIG SANDY OPENING 9080 7.1 8.6 83 16.8 17.3 97 BLIND BULL SUM 8650 31.0 24.6 126 25.6 26.7 96 EAST RIM DIVIDE 7930 .0 8.8 0 14.8 15.0 99 ELKHART PARK G.S. 9400 11.0 9.1 121 19.0 17.5 109 GROS VENTRE SUMMIT 8750 10.0 9.6 104 19.4 16.5 118 GUNSIGHT PASS 9820 17.5 -M * 20.9 -M * KENDALL R.S. 7740 .1 3.2 3 17.5 17.6 99 LOOMIS PARK 8240 6.3 9.3 68 22.4 21.2 106 NEW FORK LAKE 8340 1.2 3.5 34 14.8 14.6 101 SNIDER BASIN 8060 4.7 7.2 65 18.1 19.5 93 SPRING CREEK DIVIDE 9000 29.5 24.2 122 32.8 31.7 103 TRIPLE PEAK 8500 18.0 16.5 109 33.7 30.4 111 ----- ----- Basin wide percent of average 95 103 LOWER GREEN RIVER HAMS FORK 7840 .1 .7 14 16.0 15.9 101 HEWINTA 9519 .0 4.1 0 17.2 19.1 90 HICKERSON PARK 9145 .0 1.9 0 13.4 11.4 118 HOLE-IN-ROCK 9150 .0 1.5 0 12.7 11.0 115 INDIAN CREEK 9425 -M 23.3 * 27.5 31.1 88 KELLEY R.S. 8180 8.3 8.7 95 22.2 24.9 89 STEEL CREEK PARK 10200 9.1 17.9 51 21.0 21.7 97 ----- ----- Basin wide percent of average 50 96 UPPER BEAR RIVER BUG LAKE 7950 8.3 10.3 81 22.0 23.8 92 HAYDEN FORK 9212 .2 6.9 3 27.3 26.9 101 KELLEY R.S. 8180 8.3 8.7 95 22.2 24.9 89 LILY LAKE 9156 .0 6.0 0 21.5 22.7 95 MONTE CRISTO 8960 17.6 22.1 80 32.0 32.3 99 SALT RIVER SUMMIT 7760 6.0 4.4 136 20.4 22.9 89 TRIAL LAKE 9992 15.6 22.8 68 29.7 31.5 94 ----- ----- Basin wide percent of average 69 95 ----------------------------------------------------------------------------- -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.