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 THURSDAY: MAY 21 , 2009 ----------------------------------------------------------------------------- BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Average Avg Current Average Avg ----------------------------------------------------------------------------- WYOMING SNAKE RIVER BASE CAMP 7030 .0 4.3 0 24.6 26.1 94 COTTONWOOD CREEK 7670 14.4 11.5 125 38.4 34.5 111 GRAND TARGHEE 9260 42.7 -M * 42.5 -M * GRANITE CREEK 6770 .6 5.9 10 26.1 24.0 109 GRASSY LAKE 7265 17.7 23.3 76 42.8 43.5 98 GROS VENTRE SUMMIT 8750 5.3 8.2 65 19.2 16.7 115 GUNSIGHT PASS 9820 14.5 -M * 20.8 -M * LEWIS LAKE DIVIDE 7850 27.0 26.2 103 42.1 44.0 96 PHILLIPS BENCH 8200 21.1 21.4 99 36.1 35.4 102 SALT RIVER SUMMIT 7760 .3 2.5 12 20.3 23.2 88 SNAKE RIVER STATION 6920 .0 3.1 0 28.8 27.3 105 SPRING CREEK DIVIDE 9000 24.7 22.3 111 32.8 32.1 102 THUMB DIVIDE 7980 8.2 7.5 109 27.5 23.8 116 TOGWOTEE PASS 9580 29.6 26.3 113 36.5 31.4 116 TWO OCEAN PLATEAU 9240 43.5 29.6 147 37.8 34.8 109 WILLOW CREEK 8380 23.4 22.5 104 48.4 40.9 118 ----- ----- Basin wide percent of average 101 105 UPPER YELLOWSTONE-MADISON BEARTOOTH LAKE 9360 25.0 24.4 102 27.5 25.8 107 BLACK BEAR 8170 37.5 34.5 109 45.3 48.7 93 CANYON 7870 7.5 5.2 144 20.3 19.4 105 FISHER CREEK 9100 40.7 35.0 116 45.1 44.9 100 MADISON PLATEAU 7750 19.1 16.9 113 32.1 32.8 98 NORTHEAST ENTRANCE 7350 .0 1.7 0 18.0 16.5 109 PARKER PEAK 9400 26.1 23.1 113 24.5 21.8 112 SYLVAN LAKE 8420 -M 18.2 * 30.5 27.3 112 THUMB DIVIDE 7980 8.2 7.5 109 27.5 23.8 116 TWO OCEAN PLATEAU 9240 43.5 29.6 147 37.8 34.8 109 WHISKEY CREEK 6800 11.1 7.2 154 26.5 26.1 102 WHITE MILL 8700 26.9 23.4 115 31.6 33.7 94 WOLVERINE 7650 .0 1.7 0 17.0 17.2 99 ----- ----- Basin wide percent of average 117 103 WIND RIVER BURROUGHS CREEK 8750 12.8 8.8 145 21.8 21.4 102 COLD SPRINGS 9630 .0 2.3 0 15.7 16.0 98 DEER PARK 9700 9.3 16.4 57 23.1 29.5 78 HOBBS PARK 10100 13.2 15.5 85 21.2 19.6 108 LITTLE WARM 9370 4.5 5.9 76 19.8 18.9 105 SOUTH PASS 9040 5.7 11.6 49 20.0 25.0 80 ST. LAWRENCE ALT 8620 .0 2.2 0 14.6 14.1 104 TOGWOTEE PASS 9580 29.6 26.3 113 36.5 31.4 116 TOWNSEND CREEK 8700 .0 4.3 0 17.4 17.7 98 ----- ----- Basin wide percent of average 80 98 BIGHORN BASIN BALD MTN. 9380 19.2 22.0 87 20.0 24.0 83 BEAR TRAP MEADOW 8200 .0 .1 0 12.5 13.0 96 BLACKWATER 9780 30.4 28.7 106 31.0 27.3 114 BONE SPRINGS DIV 9350 14.3 14.6 98 19.0 20.9 91 EVENING STAR 9200 28.8 31.3 92 40.0 32.7 122 GRAVE SPRINGS 8550 1.1 5.2 21 12.5 15.1 83 KIRWIN 9550 8.9 10.0 89 19.9 16.3 122 MARQUETTE 8760 1.0 7.8 13 13.6 16.5 82 MIDDLE POWDER 7760 4.4 8.5 52 13.3 18.0 74 OWL CREEK 8975 .0 1.6 0 10.3 10.0 103 POWDER RIVER PASS 9480 7.3 6.4 114 19.5 18.2 107 SHELL CREEK 9580 16.5 15.1 109 20.3 19.2 106 SYLVAN LAKE 8420 -M 18.2 * 30.5 27.3 112 SYLVAN ROAD 7120 .2 1.4 14 25.4 22.3 114 TIMBER CREEK 7950 .1 1.7 6 12.0 13.0 92 YOUNTS PEAK 8350 15.5 13.5 115 20.9 20.8 100 ----- ----- Basin wide percent of average 88 102 SHOSHONE RIVER BLACKWATER 9780 30.4 28.7 106 31.0 27.3 114 EVENING STAR 9200 28.8 31.3 92 40.0 32.7 122 KIRWIN 9550 8.9 10.0 89 19.9 16.3 122 MARQUETTE 8760 1.0 7.8 13 13.6 16.5 82 SYLVAN LAKE 8420 -M 18.2 * 30.5 27.3 112 SYLVAN ROAD 7120 .2 1.4 14 25.4 22.3 114 YOUNTS PEAK 8350 15.5 13.5 115 20.9 20.8 100 ----- ----- Basin wide percent of average 91 111 POWDER-TONGUE BEAR TRAP MEADOW 8200 .0 .1 0 12.5 13.0 96 BIG GOOSE 7990 4.3 7.9 54 16.6 15.3 108 BONE SPRINGS DIV 9350 14.3 14.6 98 19.0 20.9 91 BURGESS JUNCTION 7880 7.6 8.1 94 16.0 17.5 91 CLOUD PEAK RESERVOIR 9860 15.0 13.4 112 21.9 20.1 109 DOME LAKE 8880 4.4 8.5 52 19.8 19.3 103 GRAVE SPRINGS 8550 1.1 5.2 21 12.5 15.1 83 HANSEN SAWMILL 8360 .0 1.2 0 13.3 12.9 103 MIDDLE POWDER 7760 4.4 8.5 52 13.3 18.0 74 POWDER RIVER PASS 9480 7.3 6.4 114 19.5 18.2 107 SUCKER CREEK 8880 10.2 8.5 120 21.5 20.2 106 TIE CREEK 6870 .0 .6 0 17.6 16.0 110 ----- ----- Basin wide percent of average 83 99 BELLE FOURCHE BLIND PARK 6890 .0 .0 100 18.1 16.5 110 COLE CANYON 5910 .0 .3 0 15.6 11.7 133 NORTH RAPID CREEK 6130 .0 .2 0 17.7 13.1 135 ----- ----- Basin wide percent of average 0 124 UPPER N. PLATTE RIVER COLUMBINE 9160 .0 9.4 0 33.3 31.2 107 DIVIDE PEAK 8880 7.7 9.9 78 33.4 26.4 127 ELK RIVER 8700 .1 5.1 2 25.6 25.0 102 JOE WRIGHT 10120 -M 22.5 * -M 33.2 * NORTH FRENCH CREEK 10130 30.1 31.4 96 39.7 32.8 121 OLD BATTLE 10000 34.6 33.3 104 47.5 42.8 111 SAGE CREEK BASIN 7850 .0 5.7 0 19.5 15.3 127 SOUTH BRUSH CREEK 8440 .0 4.8 0 22.7 22.5 101 TOWER 10500 41.4 50.0 83 51.0 48.5 105 WEBBER SPRINGS 9250 10.1 14.6 69 35.9 33.5 107 WILLOW CREEK PASS 9540 3.5 8.9 39 16.4 17.6 93 ----- ----- Basin wide percent of average 74 110 LOWER N. PLATTE - SWEETWATER - LARAMIE BROOKLYN LAKE 10240 14.5 20.0 72 28.4 29.8 95 CASPER MTN. 7900 2.3 9.2 25 17.4 22.5 77 DEADMAN HILL 10220 14.9 16.5 90 23.7 23.4 101 DEER PARK 9700 9.3 16.4 57 23.1 29.5 78 LAPRELE CREEK 8375 .0 2.5 0 16.9 18.9 89 RENO HILL 8400 5.1 7.6 67 21.5 23.3 92 ROACH 9700 5.4 11.1 49 24.3 25.0 97 SAND LAKE 10050 30.6 33.7 91 37.0 32.6 113 SOUTH PASS 9040 5.7 11.6 49 20.0 25.0 80 WINDY PEAK 7900 .6 1.0 60 15.8 15.8 100 ----- ----- Basin wide percent of average 68 93 LITTLE SNAKE RIVER BATTLE MOUNTAIN 7440 .0 .0 100 22.9 20.2 113 DIVIDE PEAK 8880 7.7 9.9 78 33.4 26.4 127 OLD BATTLE 10000 34.6 33.3 104 47.5 42.8 111 SANDSTONE RS 8150 .1 2.2 5 25.3 23.8 106 WHISKEY PARK 8950 -M 23.5 * 40.8 36.6 111 ----- ----- Basin wide percent of average 93 113 UPPER GREEN RIVER BIG SANDY OPENING 9080 1.5 7.0 21 16.8 17.6 95 BLIND BULL SUM 8650 31.0 23.3 133 25.5 27.1 94 EAST RIM DIVIDE 7930 .0 7.1 0 14.7 15.2 97 ELKHART PARK G.S. 9400 7.1 7.8 91 18.9 17.9 106 GROS VENTRE SUMMIT 8750 5.3 8.2 65 19.2 16.7 115 GUNSIGHT PASS 9820 14.5 -M * 20.8 -M * KENDALL R.S. 7740 .0 1.1 0 17.4 17.9 97 LOOMIS PARK 8240 .8 7.7 10 22.4 21.6 104 NEW FORK LAKE 8340 .0 1.9 0 15.1 14.9 101 SNIDER BASIN 8060 -M 5.4 * 17.9 19.7 91 SPRING CREEK DIVIDE 9000 24.7 22.3 111 32.8 32.1 102 TRIPLE PEAK 8500 12.5 13.8 91 33.7 30.8 109 ----- ----- Basin wide percent of average 83 101 LOWER GREEN RIVER HAMS FORK 7840 .1 .0 16.0 16.2 99 HEWINTA 9519 .0 2.9 0 17.3 19.4 89 HICKERSON PARK 9145 .0 1.1 0 13.4 11.7 115 HOLE-IN-ROCK 9150 .0 .9 0 12.8 11.3 113 INDIAN CREEK 9425 -M 21.4 * 27.3 31.4 87 KELLEY R.S. 8180 2.9 7.0 41 22.0 25.3 87 STEEL CREEK PARK 10200 9.5 16.8 57 21.0 22.1 95 ----- ----- Basin wide percent of average 43 94 UPPER BEAR RIVER BUG LAKE 7950 2.1 8.1 26 22.0 24.2 91 HAYDEN FORK 9212 .1 5.2 2 27.3 27.3 100 KELLEY R.S. 8180 2.9 7.0 41 22.0 25.3 87 LILY LAKE 9156 .0 4.6 0 21.6 23.0 94 MONTE CRISTO 8960 12.4 20.0 62 31.9 32.8 97 SALT RIVER SUMMIT 7760 .3 2.5 12 20.3 23.2 88 TRIAL LAKE 9992 10.9 21.0 52 29.9 31.9 94 ----- ----- Basin wide percent of average 42 93 ----------------------------------------------------------------------------- -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.