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: APRIL 18 , 2010 ----------------------------------------------------------------------------- BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Average Avg Current Average Avg ----------------------------------------------------------------------------- WYOMING SNAKE RIVER BASE CAMP 7030 8.4 16.4 51 13.6 23.1 59 COTTONWOOD CREEK 7670 15.4 23.5 66 22.2 30.0 74 GRAND TARGHEE 9260 39.5 -M * 30.0 -M * GRANITE CREEK 6770 8.9 16.6 54 12.7 21.2 60 GRASSY LAKE 7265 22.9 36.9 62 26.9 38.8 69 GROS VENTRE SUMMIT 8750 8.5 14.6 58 8.9 14.2 63 GUNSIGHT PASS 9820 9.5 -M * 11.0 -M * LEWIS LAKE DIVIDE 7850 19.5 36.7 53 22.2 39.7 56 PHILLIPS BENCH 8200 18.5 30.7 60 20.8 31.4 66 SALT RIVER SUMMIT 7760 10.1 14.1 72 13.0 20.5 63 SNAKE RIVER STATION 6920 7.3 17.0 43 17.1 24.2 71 SPRING CREEK DIVIDE 9000 19.3 28.7 67 18.5 28.7 64 THUMB DIVIDE 7980 10.1 18.4 55 13.7 20.6 67 TOGWOTEE PASS 9580 19.5 26.9 72 19.7 27.1 73 TWO OCEAN PLATEAU 9240 22.8 30.8 74 18.6 30.2 62 WILLOW CREEK 8380 21.7 31.9 68 28.0 35.2 80 ----- ----- Basin wide percent of average 62 66 UPPER YELLOWSTONE-MADISON BEARTOOTH LAKE 9360 14.7 25.5 58 13.9 22.0 63 BLACK BEAR 8170 27.3 41.1 66 26.6 43.7 61 CANYON 7870 8.5 13.6 63 11.2 16.7 67 FISHER CREEK 9100 25.0 37.1 67 23.6 39.5 60 MADISON PLATEAU 7750 16.4 26.0 63 20.5 29.1 70 NORTHEAST ENTRANCE 7350 4.1 10.3 40 9.1 13.8 66 PARKER PEAK 9400 19.4 23.5 83 13.4 18.0 74 SYLVAN LAKE 8420 14.1 24.2 58 18.0 23.0 78 THUMB DIVIDE 7980 10.1 18.4 55 13.7 20.6 67 TWO OCEAN PLATEAU 9240 22.8 30.8 74 18.6 30.2 62 WHISKEY CREEK 6800 9.9 17.7 56 13.0 22.8 57 WHITE MILL 8700 17.0 26.1 65 16.3 29.4 55 WOLVERINE 7650 6.0 10.7 56 7.6 14.1 54 ----- ----- Basin wide percent of average 64 64 WIND RIVER BURROUGHS CREEK 8750 -M 15.1 * -M 17.9 * COLD SPRINGS 9630 6.9 6.6 105 9.9 12.3 80 DEER PARK 9700 17.7 17.6 101 20.4 24.5 83 HOBBS PARK 10100 17.3 16.9 102 17.2 15.0 115 LITTLE WARM 9370 7.9 12.4 64 9.0 15.1 60 SOUTH PASS 9040 15.6 17.7 88 17.9 20.7 86 ST. LAWRENCE ALT 8620 8.6 7.1 121 11.1 10.4 107 TOGWOTEE PASS 9580 19.5 26.9 72 19.7 27.1 73 TOWNSEND CREEK 8700 12.3 9.7 127 15.9 13.7 116 ----- ----- Basin wide percent of average 92 87 BIGHORN BASIN BALD MTN. 9380 13.9 22.0 63 11.8 19.4 61 BEAR TRAP MEADOW 8200 7.3 4.4 166 9.0 9.6 94 BLACKWATER 9780 18.5 27.0 69 17.0 22.9 74 BONE SPRINGS DIV 9350 12.0 17.7 68 10.7 16.5 65 EVENING STAR 9200 20.2 32.2 63 21.6 27.9 77 GRAVE SPRINGS 8550 9.5 10.8 88 11.0 11.6 95 KIRWIN 9550 9.7 12.4 78 9.8 12.7 77 MARQUETTE 8760 7.6 10.6 72 9.1 11.7 78 MIDDLE POWDER 7760 11.1 14.0 79 9.3 14.1 66 OWL CREEK 8975 4.5 5.1 88 5.6 7.0 80 POWDER RIVER PASS 9480 8.8 11.8 75 11.7 14.1 83 SHELL CREEK 9580 12.0 16.2 74 10.9 15.1 72 SYLVAN LAKE 8420 14.1 24.2 58 18.0 23.0 78 SYLVAN ROAD 7120 5.3 11.6 46 12.7 19.2 66 TIMBER CREEK 7950 4.4 5.6 79 6.8 8.8 77 YOUNTS PEAK 8350 11.1 18.2 61 9.8 17.6 56 ----- ----- Basin wide percent of average 70 74 SHOSHONE RIVER BLACKWATER 9780 18.5 27.0 69 17.0 22.9 74 EVENING STAR 9200 20.2 32.2 63 21.6 27.9 77 KIRWIN 9550 9.7 12.4 78 9.8 12.7 77 MARQUETTE 8760 7.6 10.6 72 9.1 11.7 78 SYLVAN LAKE 8420 14.1 24.2 58 18.0 23.0 78 SYLVAN ROAD 7120 5.3 11.6 46 12.7 19.2 66 YOUNTS PEAK 8350 11.1 18.2 61 9.8 17.6 56 ----- ----- Basin wide percent of average 64 73 POWDER-TONGUE BEAR TRAP MEADOW 8200 7.3 4.4 166 9.0 9.6 94 BIG GOOSE 7990 9.0 12.5 72 10.8 10.9 99 BONE SPRINGS DIV 9350 12.0 17.7 68 10.7 16.5 65 BURGESS JUNCTION 7880 10.5 13.2 80 10.8 13.8 78 CLOUD PEAK RESERVOIR 9860 12.8 15.4 83 11.8 15.0 79 DOME LAKE 8880 8.4 13.9 60 11.8 15.0 79 GRAVE SPRINGS 8550 9.5 10.8 88 11.0 11.6 95 HANSEN SAWMILL 8360 5.6 6.0 93 7.8 9.5 82 MIDDLE POWDER 7760 11.1 14.0 79 9.3 14.1 66 POWDER RIVER PASS 9480 8.8 11.8 75 11.7 14.1 83 SUCKER CREEK 8880 11.7 13.4 87 13.5 15.5 87 TIE CREEK 6870 1.3 5.4 24 10.1 11.7 86 ----- ----- Basin wide percent of average 78 82 BELLE FOURCHE BLIND PARK 6890 3.0 7.4 41 12.2 12.6 97 COLE CANYON 5910 4.4 7.0 63 10.3 7.8 132 NORTH RAPID CREEK 6130 3.8 8.6 44 11.2 9.7 115 ----- ----- Basin wide percent of average 49 112 UPPER N. PLATTE RIVER COLUMBINE 9160 19.3 24.4 79 23.4 27.5 85 DIVIDE PEAK 8880 22.8 20.9 109 25.6 22.6 113 ELK RIVER 8700 17.5 19.3 91 21.3 21.5 99 JOE WRIGHT 10120 20.1 23.9 84 22.9 27.6 83 NORTH FRENCH CREEK 10130 37.6 32.9 114 36.0 27.2 132 OLD BATTLE 10000 36.1 35.0 103 38.6 37.5 103 SAGE CREEK BASIN 7850 15.7 12.1 130 14.0 13.1 107 SOUTH BRUSH CREEK 8440 13.0 13.2 98 19.5 18.3 107 TOWER 10500 38.0 50.0 76 35.3 42.1 84 WEBBER SPRINGS 9250 24.1 26.1 92 29.7 29.2 102 WILLOW CREEK PASS 9540 9.1 13.8 66 11.7 14.3 82 ----- ----- Basin wide percent of average 93 99 LOWER N. PLATTE - SWEETWATER - LARAMIE BROOKLYN LAKE 10240 22.1 26.8 82 23.6 24.7 96 CASPER MTN. 7900 16.7 17.0 98 16.7 17.0 98 DEADMAN HILL 10220 22.4 18.6 120 18.7 19.0 98 DEER PARK 9700 17.7 17.6 101 20.4 24.5 83 LAPRELE CREEK 8375 9.6 10.0 96 14.5 14.5 100 RENO HILL 8400 16.6 16.0 104 19.5 17.6 111 ROACH 9700 17.8 18.4 97 21.9 20.6 106 SAND LAKE 10050 32.4 35.3 92 32.4 26.9 120 SOUTH PASS 9040 15.6 17.7 88 17.9 20.7 86 WINDY PEAK 7900 9.2 7.7 119 12.7 12.0 106 ----- ----- Basin wide percent of average 97 100 LITTLE SNAKE RIVER BATTLE MOUNTAIN 7440 8.3 8.2 101 15.8 17.4 91 DIVIDE PEAK 8880 22.8 20.9 109 25.6 22.6 113 OLD BATTLE 10000 36.1 35.0 103 38.6 37.5 103 SANDSTONE RS 8150 13.4 13.1 102 18.2 20.3 90 WHISKEY PARK 8950 26.3 30.6 86 32.1 31.4 102 ----- ----- Basin wide percent of average 99 101 UPPER GREEN RIVER BIG SANDY OPENING 9080 9.5 15.3 62 10.4 14.7 71 BLIND BULL SUM 8650 17.2 28.9 60 12.6 24.0 53 EAST RIM DIVIDE 7930 5.7 14.0 41 7.6 13.0 58 ELKHART PARK G.S. 9400 8.8 14.0 63 10.0 14.7 68 GROS VENTRE SUMMIT 8750 8.5 14.6 58 8.9 14.2 63 GUNSIGHT PASS 9820 9.5 -M * 11.0 -M * KENDALL R.S. 7740 5.2 13.3 39 9.0 15.6 58 LOOMIS PARK 8240 8.1 16.9 48 11.3 18.8 60 NEW FORK LAKE 8340 5.8 11.1 52 7.2 12.4 58 POCKET CREEK 9360 8.7 -M * 11.9 -M * SNIDER BASIN 8060 9.8 14.8 66 11.2 17.6 64 SPRING CREEK DIVIDE 9000 19.3 28.7 67 18.5 28.7 64 TRIPLE PEAK 8500 16.5 25.9 64 20.0 27.0 74 ----- ----- Basin wide percent of average 58 63 LOWER GREEN RIVER HAMS FORK 7840 7.7 9.6 80 10.1 13.5 75 HEWINTA 9519 9.5 12.1 79 12.6 16.4 77 HICKERSON PARK 9145 7.4 8.1 91 11.4 9.1 125 HOLE-IN-ROCK 9150 5.6 7.1 79 10.5 8.6 122 INDIAN CREEK 9425 19.0 29.6 64 17.6 27.9 63 KELLEY R.S. 8180 11.3 17.0 66 14.7 22.2 66 STEEL CREEK PARK 10200 14.7 17.5 84 15.8 18.6 85 ----- ----- Basin wide percent of average 74 80 UPPER BEAR RIVER BUG LAKE 7950 11.8 21.5 55 15.7 21.0 75 HAYDEN FORK 9212 11.5 16.3 71 18.2 23.3 78 KELLEY R.S. 8180 11.3 17.0 66 14.7 22.2 66 LILY LAKE 9156 11.6 14.3 81 14.5 19.6 74 MONTE CRISTO 8960 20.2 30.5 66 19.9 28.1 71 SALT RIVER SUMMIT 7760 10.1 14.1 72 13.0 20.5 63 TRIAL LAKE 9992 17.3 26.5 65 15.8 27.5 57 ----- ----- Basin wide percent of average 67 69 ----------------------------------------------------------------------------- -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.