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 SATURDAY: MAY 1 , 2010 ----------------------------------------------------------------------------- BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Average Avg Current Average Avg ----------------------------------------------------------------------------- WYOMING SNAKE RIVER BASE CAMP 7030 4.0 12.6 32 15.1 24.3 62 COTTONWOOD CREEK 7670 15.0 20.1 75 25.5 31.8 80 GRAND TARGHEE 9260 43.4 -M * 33.3 -M * GRANITE CREEK 6770 5.0 13.2 38 14.1 22.3 63 GRASSY LAKE 7265 19.6 33.7 58 29.3 40.7 72 GROS VENTRE SUMMIT 8750 8.2 13.4 61 10.5 15.2 69 GUNSIGHT PASS 9820 9.9 -M * 13.1 -M * LEWIS LAKE DIVIDE 7850 17.2 34.8 49 24.5 41.5 59 PHILLIPS BENCH 8200 17.9 29.6 60 23.5 33.0 71 SALT RIVER SUMMIT 7760 7.3 11.0 66 14.5 21.5 67 SNAKE RIVER STATION 6920 1.8 12.6 14 18.6 25.4 73 SPRING CREEK DIVIDE 9000 20.1 28.7 70 20.6 30.1 68 THUMB DIVIDE 7980 7.0 15.3 46 15.5 21.9 71 TOGWOTEE PASS 9580 20.7 27.9 74 20.6 28.8 72 TWO OCEAN PLATEAU 9240 24.4 31.8 77 20.7 32.0 65 WILLOW CREEK 8380 20.0 30.9 65 32.0 37.5 85 ----- ----- Basin wide percent of average 60 70 UPPER YELLOWSTONE-MADISON BEARTOOTH LAKE 9360 16.5 25.9 64 15.9 23.4 68 BLACK BEAR 8170 27.2 40.1 68 30.1 45.7 66 CANYON 7870 7.1 11.5 62 13.2 17.6 75 FISHER CREEK 9100 24.8 37.8 66 26.7 41.7 64 MADISON PLATEAU 7750 16.1 24.4 66 23.4 30.3 77 NORTHEAST ENTRANCE 7350 .6 7.4 8 10.3 14.7 70 PARKER PEAK 9400 19.1 24.5 78 15.1 19.4 78 SYLVAN LAKE 8420 12.5 23.9 52 20.4 24.6 83 THUMB DIVIDE 7980 7.0 15.3 46 15.5 21.9 71 TWO OCEAN PLATEAU 9240 24.4 31.8 77 20.7 32.0 65 WHISKEY CREEK 6800 9.1 15.4 59 15.2 24.1 63 WHITE MILL 8700 17.4 26.4 66 18.2 31.1 59 WOLVERINE 7650 .9 7.4 12 8.7 15.1 58 ----- ----- Basin wide percent of average 63 68 WIND RIVER BURROUGHS CREEK 8750 9.6 13.8 70 -M 19.2 * COLD SPRINGS 9630 6.5 4.9 133 12.7 13.8 92 DEER PARK 9700 17.8 19.0 94 22.7 26.8 85 HOBBS PARK 10100 19.5 18.0 108 20.6 16.8 123 LITTLE WARM 9370 8.1 11.3 72 11.4 16.7 68 SOUTH PASS 9040 15.1 18.1 83 20.1 22.6 89 ST. LAWRENCE ALT 8620 6.5 6.3 103 13.9 12.0 116 TOGWOTEE PASS 9580 20.7 27.9 74 20.6 28.8 72 TOWNSEND CREEK 8700 11.3 9.2 123 18.2 15.4 118 ----- ----- Basin wide percent of average 90 92 BIGHORN BASIN BALD MTN. 9380 15.6 23.5 66 12.8 21.2 60 BEAR TRAP MEADOW 8200 3.8 2.7 141 10.1 10.8 94 BLACKWATER 9780 19.6 28.7 68 18.7 24.6 76 BONE SPRINGS DIV 9350 12.2 18.3 67 12.7 18.2 70 EVENING STAR 9200 18.7 33.2 56 23.6 29.8 79 GRAVE SPRINGS 8550 -M 11.1 * 13.0 13.0 100 KIRWIN 9550 10.6 13.0 82 12.3 14.1 87 MARQUETTE 8760 7.6 11.2 68 11.6 13.6 85 MIDDLE POWDER 7760 11.3 14.5 78 10.8 15.7 69 OWL CREEK 8975 .9 4.1 22 7.2 8.1 89 POWDER RIVER PASS 9480 7.6 10.9 70 12.8 15.7 82 SHELL CREEK 9580 13.6 16.9 80 13.1 16.7 78 SYLVAN LAKE 8420 12.5 23.9 52 20.4 24.6 83 SYLVAN ROAD 7120 .8 8.4 10 14.6 20.4 72 TIMBER CREEK 7950 1.8 4.9 37 8.2 10.4 79 YOUNTS PEAK 8350 10.8 18.2 59 11.4 18.7 61 ----- ----- Basin wide percent of average 63 77 SHOSHONE RIVER BLACKWATER 9780 19.6 28.7 68 18.7 24.6 76 EVENING STAR 9200 18.7 33.2 56 23.6 29.8 79 KIRWIN 9550 10.6 13.0 82 12.3 14.1 87 MARQUETTE 8760 7.6 11.2 68 11.6 13.6 85 SYLVAN LAKE 8420 12.5 23.9 52 20.4 24.6 83 SYLVAN ROAD 7120 .8 8.4 10 14.6 20.4 72 YOUNTS PEAK 8350 10.8 18.2 59 11.4 18.7 61 ----- ----- Basin wide percent of average 59 77 POWDER-TONGUE BEAR TRAP MEADOW 8200 3.8 2.7 141 10.1 10.8 94 BIG GOOSE 7990 8.7 11.7 74 12.6 12.8 98 BONE SPRINGS DIV 9350 12.2 18.3 67 12.7 18.2 70 BURGESS JUNCTION 7880 11.7 13.3 88 13.2 15.3 86 CLOUD PEAK RESERVOIR 9860 13.6 16.3 83 14.0 16.9 83 DOME LAKE 8880 8.8 13.7 64 14.2 16.7 85 GRAVE SPRINGS 8550 -M 11.1 * 13.0 13.0 100 HANSEN SAWMILL 8360 2.6 5.0 52 9.1 10.9 83 MIDDLE POWDER 7760 11.3 14.5 78 10.8 15.7 69 POWDER RIVER PASS 9480 7.6 10.9 70 12.8 15.7 82 SUCKER CREEK 8880 12.9 13.2 98 16.8 17.3 97 TIE CREEK 6870 1.0 4.2 24 12.4 13.4 93 ----- ----- Basin wide percent of average 76 86 BELLE FOURCHE BLIND PARK 6890 .7 4.0 18 14.0 14.1 99 COLE CANYON 5910 .8 5.2 15 11.9 9.4 127 NORTH RAPID CREEK 6130 .2 4.2 5 13.0 11.3 115 ----- ----- Basin wide percent of average 13 112 UPPER N. PLATTE RIVER COLUMBINE 9160 17.6 21.3 83 26.1 29.0 90 DIVIDE PEAK 8880 20.7 19.6 106 27.6 24.2 114 ELK RIVER 8700 14.5 15.4 94 23.4 22.9 102 JOE WRIGHT 10120 22.7 25.1 90 26.8 29.9 90 NORTH FRENCH CREEK 10130 40.0 34.5 116 39.8 29.5 135 OLD BATTLE 10000 38.3 36.8 104 41.2 39.7 104 SAGE CREEK BASIN 7850 10.1 11.4 89 15.0 14.0 107 SOUTH BRUSH CREEK 8440 12.4 11.3 110 22.7 20.0 114 TOWER 10500 39.5 52.1 76 37.5 44.9 84 WEBBER SPRINGS 9250 22.8 25.3 90 32.2 31.0 104 WILLOW CREEK PASS 9540 12.3 14.2 87 15.1 15.6 97 ----- ----- Basin wide percent of average 94 102 LOWER N. PLATTE - SWEETWATER - LARAMIE BROOKLYN LAKE 10240 23.7 28.3 84 26.1 26.8 97 CASPER MTN. 7900 15.7 17.3 91 17.9 19.4 92 DEADMAN HILL 10220 27.2 19.6 139 23.4 20.8 113 DEER PARK 9700 17.8 19.0 94 22.7 26.8 85 LAPRELE CREEK 8375 7.5 7.4 101 16.3 16.3 100 RENO HILL 8400 17.6 15.0 117 22.9 20.0 115 ROACH 9700 20.2 18.6 109 25.7 22.3 115 SAND LAKE 10050 35.9 36.9 97 36.3 29.1 125 SOUTH PASS 9040 15.1 18.1 83 20.1 22.6 89 WINDY PEAK 7900 8.7 5.2 167 15.3 13.4 114 ----- ----- Basin wide percent of average 102 104 LITTLE SNAKE RIVER BATTLE MOUNTAIN 7440 2.9 4.9 59 17.7 18.5 96 DIVIDE PEAK 8880 20.7 19.6 106 27.6 24.2 114 OLD BATTLE 10000 38.3 36.8 104 41.2 39.7 104 SANDSTONE RS 8150 9.0 9.8 92 20.4 21.8 94 WHISKEY PARK 8950 26.2 30.6 86 35.2 33.6 105 ----- ----- Basin wide percent of average 95 103 UPPER GREEN RIVER BIG SANDY OPENING 9080 8.6 13.7 63 11.4 15.8 72 BLIND BULL SUM 8650 19.4 28.0 69 14.7 25.1 59 EAST RIM DIVIDE 7930 .9 13.3 7 8.5 13.8 62 ELKHART PARK G.S. 9400 7.5 13.0 58 10.7 15.9 67 GROS VENTRE SUMMIT 8750 8.2 13.4 61 10.5 15.2 69 GUNSIGHT PASS 9820 9.9 -M * 13.1 -M * KENDALL R.S. 7740 .2 10.3 2 9.7 16.5 59 LOOMIS PARK 8240 4.9 14.6 34 12.2 19.9 61 NEW FORK LAKE 8340 2.1 8.7 24 7.4 13.3 56 POCKET CREEK 9360 7.6 -M * 13.3 -M * SNIDER BASIN 8060 6.8 12.9 53 12.8 18.5 69 SPRING CREEK DIVIDE 9000 20.1 28.7 70 20.6 30.1 68 TRIPLE PEAK 8500 15.1 24.0 63 23.1 28.5 81 ----- ----- Basin wide percent of average 52 67 LOWER GREEN RIVER HAMS FORK 7840 2.2 6.3 35 11.4 14.7 78 HEWINTA 9519 7.1 9.5 75 15.2 17.7 86 HICKERSON PARK 9145 5.7 5.9 97 13.2 10.1 131 HOLE-IN-ROCK 9150 3.2 5.0 64 12.4 9.7 128 INDIAN CREEK 9425 18.5 28.5 65 19.3 29.3 66 KELLEY R.S. 8180 8.8 14.4 61 15.9 23.5 68 STEEL CREEK PARK 10200 17.8 18.6 96 19.0 20.1 95 ----- ----- Basin wide percent of average 72 85 UPPER BEAR RIVER BUG LAKE 7950 11.0 18.4 60 16.7 22.3 75 HAYDEN FORK 9212 7.6 13.3 57 21.1 25.0 84 KELLEY R.S. 8180 8.8 14.4 61 15.9 23.5 68 LILY LAKE 9156 10.5 11.4 92 17.3 21.0 82 MONTE CRISTO 8960 16.2 28.5 57 21.0 30.1 70 SALT RIVER SUMMIT 7760 7.3 11.0 66 14.5 21.5 67 TRIAL LAKE 9992 19.2 26.5 72 18.5 29.3 63 ----- ----- Basin wide percent of average 65 72 ----------------------------------------------------------------------------- -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 1971-2000. 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.