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 WEDNESDAY: MAY 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 .0 4.7 0 24.6 26.0 95 COTTONWOOD CREEK 7670 16.0 12.0 133 38.5 34.4 112 GRAND TARGHEE 9260 43.4 -M * 42.5 -M * GRANITE CREEK 6770 1.8 6.3 29 26.0 23.9 109 GRASSY LAKE 7265 19.0 24.0 79 43.2 43.4 100 GROS VENTRE SUMMIT 8750 6.4 8.6 74 19.4 16.7 116 GUNSIGHT PASS 9820 15.0 -M * 20.9 -M * LEWIS LAKE DIVIDE 7850 29.1 26.8 109 42.3 43.9 96 PHILLIPS BENCH 8200 22.3 22.0 101 36.2 35.2 103 SALT RIVER SUMMIT 7760 1.2 3.0 40 20.3 23.1 88 SNAKE RIVER STATION 6920 .0 3.7 0 28.9 27.2 106 SPRING CREEK DIVIDE 9000 25.6 22.8 112 32.7 32.0 102 THUMB DIVIDE 7980 10.1 8.0 126 27.6 23.7 116 TOGWOTEE PASS 9580 30.0 26.6 113 36.5 31.3 117 TWO OCEAN PLATEAU 9240 44.8 29.8 150 37.8 34.7 109 WILLOW CREEK 8380 25.1 23.1 109 48.5 40.8 119 ----- ----- Basin wide percent of average 105 106 UPPER YELLOWSTONE-MADISON BEARTOOTH LAKE 9360 25.3 24.8 102 27.5 25.6 107 BLACK BEAR 8170 37.8 34.9 108 45.3 48.6 93 CANYON 7870 8.4 5.6 150 20.3 19.3 105 FISHER CREEK 9100 40.4 35.4 114 45.1 44.8 101 MADISON PLATEAU 7750 19.6 17.5 112 32.1 32.6 98 NORTHEAST ENTRANCE 7350 .0 1.9 0 18.0 16.4 110 PARKER PEAK 9400 27.4 23.4 117 24.5 21.7 113 SYLVAN LAKE 8420 19.2 18.8 102 30.6 27.1 113 THUMB DIVIDE 7980 10.1 8.0 126 27.6 23.7 116 TWO OCEAN PLATEAU 9240 44.8 29.8 150 37.8 34.7 109 WHISKEY CREEK 6800 11.7 7.7 152 26.7 26.0 103 WHITE MILL 8700 27.4 23.7 116 31.7 33.6 94 WOLVERINE 7650 .0 1.8 0 17.2 17.1 101 ----- ----- Basin wide percent of average 117 104 WIND RIVER BURROUGHS CREEK 8750 13.8 9.3 148 21.8 21.3 102 COLD SPRINGS 9630 .0 2.6 0 15.7 15.9 99 DEER PARK 9700 10.4 16.6 63 23.0 29.4 78 HOBBS PARK 10100 13.9 15.8 88 21.2 19.5 109 LITTLE WARM 9370 5.8 6.3 92 19.8 18.8 105 SOUTH PASS 9040 6.8 12.1 56 20.1 24.9 81 ST. LAWRENCE ALT 8620 .0 2.6 0 14.6 14.1 104 TOGWOTEE PASS 9580 30.0 26.6 113 36.5 31.3 117 TOWNSEND CREEK 8700 .9 4.7 19 17.4 17.6 99 ----- ----- Basin wide percent of average 84 99 BIGHORN BASIN BALD MTN. 9380 20.1 22.3 90 20.0 23.9 84 BEAR TRAP MEADOW 8200 .0 .2 0 12.5 12.9 97 BLACKWATER 9780 31.5 28.8 109 31.0 27.1 114 BONE SPRINGS DIV 9350 15.2 15.1 101 19.0 20.8 91 EVENING STAR 9200 29.5 31.7 93 40.0 32.5 123 GRAVE SPRINGS 8550 2.3 5.7 40 12.5 15.0 83 KIRWIN 9550 10.2 10.2 100 19.9 16.2 123 MARQUETTE 8760 2.8 8.1 35 13.6 16.3 83 MIDDLE POWDER 7760 5.7 9.1 63 13.2 17.9 74 OWL CREEK 8975 .0 1.8 0 10.3 9.9 104 POWDER RIVER PASS 9480 8.4 6.8 124 19.5 18.1 108 SHELL CREEK 9580 17.5 15.4 114 20.3 19.1 106 SYLVAN LAKE 8420 19.2 18.8 102 30.6 27.1 113 SYLVAN ROAD 7120 .0 1.7 0 25.3 22.2 114 TIMBER CREEK 7950 .0 1.8 0 12.1 12.9 94 YOUNTS PEAK 8350 16.5 13.9 119 20.9 20.7 101 ----- ----- Basin wide percent of average 93 103 SHOSHONE RIVER BLACKWATER 9780 31.5 28.8 109 31.0 27.1 114 EVENING STAR 9200 29.5 31.7 93 40.0 32.5 123 KIRWIN 9550 10.2 10.2 100 19.9 16.2 123 MARQUETTE 8760 2.8 8.1 35 13.6 16.3 83 SYLVAN LAKE 8420 19.2 18.8 102 30.6 27.1 113 SYLVAN ROAD 7120 .0 1.7 0 25.3 22.2 114 YOUNTS PEAK 8350 16.5 13.9 119 20.9 20.7 101 ----- ----- Basin wide percent of average 97 112 POWDER-TONGUE BEAR TRAP MEADOW 8200 .0 .2 0 12.5 12.9 97 BIG GOOSE 7990 5.2 8.2 63 16.6 15.2 109 BONE SPRINGS DIV 9350 15.2 15.1 101 19.0 20.8 91 BURGESS JUNCTION 7880 8.5 8.6 99 16.1 17.4 93 CLOUD PEAK RESERVOIR 9860 15.9 13.9 114 22.1 20.0 110 DOME LAKE 8880 5.6 8.9 63 19.8 19.2 103 GRAVE SPRINGS 8550 2.3 5.7 40 12.5 15.0 83 HANSEN SAWMILL 8360 .0 1.4 0 13.4 12.8 105 MIDDLE POWDER 7760 5.7 9.1 63 13.2 17.9 74 POWDER RIVER PASS 9480 8.4 6.8 124 19.5 18.1 108 SUCKER CREEK 8880 10.7 8.8 122 21.6 20.0 108 TIE CREEK 6870 .0 .7 0 17.7 15.8 112 ----- ----- Basin wide percent of average 89 99 BELLE FOURCHE BLIND PARK 6890 .0 .0 100 18.1 16.4 110 COLE CANYON 5910 .0 .3 0 15.6 11.6 134 NORTH RAPID CREEK 6130 .0 .2 0 17.7 13.0 136 ----- ----- Basin wide percent of average 0 125 UPPER N. PLATTE RIVER COLUMBINE 9160 .1 10.2 1 33.3 31.1 107 DIVIDE PEAK 8880 9.7 10.4 93 33.4 26.3 127 ELK RIVER 8700 .1 5.5 2 25.6 24.9 103 JOE WRIGHT 10120 19.3 22.8 85 35.1 33.1 106 NORTH FRENCH CREEK 10130 -M 31.8 * -M 32.6 * OLD BATTLE 10000 36.0 33.8 107 47.4 42.7 111 SAGE CREEK BASIN 7850 .0 6.0 0 19.4 15.3 127 SOUTH BRUSH CREEK 8440 .0 5.1 0 22.8 22.4 102 TOWER 10500 43.1 50.4 86 51.0 48.3 106 WEBBER SPRINGS 9250 12.5 15.3 82 35.9 33.4 107 WILLOW CREEK PASS 9540 4.4 9.4 47 16.3 17.5 93 ----- ----- Basin wide percent of average 74 109 LOWER N. PLATTE - SWEETWATER - LARAMIE BROOKLYN LAKE 10240 15.6 20.7 75 28.4 29.7 96 CASPER MTN. 7900 3.8 9.7 39 17.3 22.4 77 DEADMAN HILL 10220 15.7 16.8 93 23.7 23.3 102 DEER PARK 9700 10.4 16.6 63 23.0 29.4 78 LAPRELE CREEK 8375 .0 2.7 0 16.8 18.7 90 RENO HILL 8400 6.4 8.0 80 21.7 23.1 94 ROACH 9700 6.6 11.6 57 24.2 24.9 97 SAND LAKE 10050 31.2 34.1 91 37.0 32.5 114 SOUTH PASS 9040 6.8 12.1 56 20.1 24.9 81 WINDY PEAK 7900 .6 1.1 55 15.9 15.7 101 ----- ----- Basin wide percent of average 73 93 LITTLE SNAKE RIVER BATTLE MOUNTAIN 7440 .0 .0 100 22.9 20.1 114 DIVIDE PEAK 8880 9.7 10.4 93 33.4 26.3 127 OLD BATTLE 10000 36.0 33.8 107 47.4 42.7 111 SANDSTONE RS 8150 .1 2.5 4 25.3 23.7 107 WHISKEY PARK 8950 -M 24.2 * 40.8 36.5 112 ----- ----- Basin wide percent of average 98 114 UPPER GREEN RIVER BIG SANDY OPENING 9080 3.0 7.4 41 16.9 17.5 97 BLIND BULL SUM 8650 31.3 23.6 133 25.6 27.0 95 EAST RIM DIVIDE 7930 .0 7.6 0 14.8 15.2 97 ELKHART PARK G.S. 9400 9.0 8.1 111 19.0 17.8 107 GROS VENTRE SUMMIT 8750 6.4 8.6 74 19.4 16.7 116 GUNSIGHT PASS 9820 15.0 -M * 20.9 -M * KENDALL R.S. 7740 .1 1.6 6 17.4 17.8 98 LOOMIS PARK 8240 2.4 8.1 30 22.3 21.5 104 NEW FORK LAKE 8340 .0 2.3 0 15.6 14.9 105 SNIDER BASIN 8060 .4 5.9 7 18.1 19.7 92 SPRING CREEK DIVIDE 9000 25.6 22.8 112 32.7 32.0 102 TRIPLE PEAK 8500 13.7 14.5 94 33.7 30.7 110 ----- ----- Basin wide percent of average 83 102 LOWER GREEN RIVER HAMS FORK 7840 .1 .0 16.0 16.1 99 HEWINTA 9519 .0 3.2 0 17.3 19.4 89 HICKERSON PARK 9145 .0 1.2 0 13.4 11.7 115 HOLE-IN-ROCK 9150 .0 1.0 0 12.8 11.2 114 INDIAN CREEK 9425 -M 21.9 * 27.4 31.4 87 KELLEY R.S. 8180 4.3 7.4 58 22.2 25.2 88 STEEL CREEK PARK 10200 10.1 17.1 59 21.0 22.0 95 ----- ----- Basin wide percent of average 48 95 UPPER BEAR RIVER BUG LAKE 7950 3.9 8.6 45 22.0 24.1 91 HAYDEN FORK 9212 .0 5.7 0 27.3 27.2 100 KELLEY R.S. 8180 4.3 7.4 58 22.2 25.2 88 LILY LAKE 9156 .0 5.0 0 21.6 22.9 94 MONTE CRISTO 8960 13.5 20.5 66 31.9 32.7 98 SALT RIVER SUMMIT 7760 1.2 3.0 40 20.3 23.1 88 TRIAL LAKE 9992 11.7 21.5 54 29.8 31.8 94 ----- ----- Basin wide percent of average 48 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.