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 TUESDAY: APRIL 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 13.3 15.7 85 21.3 23.4 91 COTTONWOOD CREEK 7670 27.7 22.9 121 34.7 30.4 114 GRAND TARGHEE 9260 49.4 -M * 38.2 -M * GRANITE CREEK 6770 15.6 15.9 98 23.2 21.5 108 GRASSY LAKE 7265 33.5 36.5 92 38.0 39.3 97 GROS VENTRE SUMMIT 8750 -M 14.4 * 17.4 14.4 121 GUNSIGHT PASS 9820 16.5 -M * 17.9 -M * LEWIS LAKE DIVIDE 7850 34.4 36.5 94 36.5 40.1 91 PHILLIPS BENCH 8200 30.2 30.7 98 33.0 31.8 104 SALT RIVER SUMMIT 7760 15.4 13.6 113 18.6 20.7 90 SNAKE RIVER STATION 6920 16.5 16.2 102 24.7 24.5 101 SPRING CREEK DIVIDE 9000 31.4 28.8 109 29.9 29.0 103 THUMB DIVIDE 7980 20.8 17.8 117 23.8 20.9 114 TOGWOTEE PASS 9580 30.3 27.2 111 32.6 27.5 119 TWO OCEAN PLATEAU 9240 41.8 31.2 134 32.0 30.6 105 WILLOW CREEK 8380 36.1 31.9 113 43.3 35.7 121 ----- ----- Basin wide percent of average 107 105 UPPER YELLOWSTONE-MADISON BEARTOOTH LAKE 9360 24.9 25.6 97 23.0 22.3 103 BLACK BEAR 8170 38.2 40.9 93 38.9 44.1 88 CANYON 7870 14.0 13.2 106 16.5 16.9 98 FISHER CREEK 9100 38.4 37.4 103 38.5 40.0 96 MADISON PLATEAU 7750 24.7 25.9 95 26.9 29.4 91 NORTHEAST ENTRANCE 7350 8.2 9.7 85 15.0 14.0 107 PARKER PEAK 9400 29.9 23.7 126 20.4 18.3 111 SYLVAN LAKE 8420 21.5 24.1 89 25.5 23.3 109 THUMB DIVIDE 7980 20.8 17.8 117 23.8 20.9 114 TWO OCEAN PLATEAU 9240 41.8 31.2 134 32.0 30.6 105 WHISKEY CREEK 6800 18.4 17.4 106 22.6 23.1 98 WHITE MILL 8700 26.4 26.2 101 26.3 29.7 89 WOLVERINE 7650 11.1 10.0 111 13.6 14.3 95 ----- ----- Basin wide percent of average 105 99 WIND RIVER BURROUGHS CREEK 8750 17.5 14.9 117 18.6 18.2 102 COLD SPRINGS 9630 9.0 5.9 153 12.7 12.6 101 DEER PARK 9700 15.0 18.0 83 20.4 25.0 82 HOBBS PARK 10100 16.6 17.0 98 17.2 15.3 112 LITTLE WARM 9370 12.6 12.2 103 16.4 15.4 106 SOUTH PASS 9040 15.6 17.9 87 17.7 21.1 84 ST. LAWRENCE ALT 8620 7.8 6.7 116 12.1 10.8 112 TOGWOTEE PASS 9580 30.3 27.2 111 32.6 27.5 119 TOWNSEND CREEK 8700 11.6 9.6 121 15.2 14.0 109 ----- ----- Basin wide percent of average 105 102 BIGHORN BASIN BALD MTN. 9380 19.8 22.5 88 16.9 19.8 85 BEAR TRAP MEADOW 8200 7.1 3.8 187 10.5 9.9 106 BLACKWATER 9780 28.0 27.3 103 25.5 23.3 109 BONE SPRINGS DIV 9350 17.0 17.7 96 15.8 16.9 93 EVENING STAR 9200 31.5 32.4 97 33.9 28.3 120 GRAVE SPRINGS 8550 10.2 11.0 93 11.5 11.9 97 KIRWIN 9550 14.7 12.5 118 16.4 13.0 126 MARQUETTE 8760 8.2 10.7 77 10.6 12.1 88 MIDDLE POWDER 7760 12.5 14.3 87 11.6 14.4 81 OWL CREEK 8975 5.8 4.9 118 7.7 7.2 107 POWDER RIVER PASS 9480 12.6 11.7 108 16.0 14.4 111 SHELL CREEK 9580 16.4 16.3 101 17.0 15.4 110 SYLVAN LAKE 8420 21.5 24.1 89 25.5 23.3 109 SYLVAN ROAD 7120 10.9 11.1 98 21.0 19.5 108 TIMBER CREEK 7950 5.2 5.4 96 9.4 9.1 103 YOUNTS PEAK 8350 19.6 18.2 108 17.7 17.9 99 ----- ----- Basin wide percent of average 99 104 SHOSHONE RIVER BLACKWATER 9780 28.0 27.3 103 25.5 23.3 109 EVENING STAR 9200 31.5 32.4 97 33.9 28.3 120 KIRWIN 9550 14.7 12.5 118 16.4 13.0 126 MARQUETTE 8760 8.2 10.7 77 10.6 12.1 88 SYLVAN LAKE 8420 21.5 24.1 89 25.5 23.3 109 SYLVAN ROAD 7120 10.9 11.1 98 21.0 19.5 108 YOUNTS PEAK 8350 19.6 18.2 108 17.7 17.9 99 ----- ----- Basin wide percent of average 99 110 POWDER-TONGUE BEAR TRAP MEADOW 8200 7.1 3.8 187 10.5 9.9 106 BIG GOOSE 7990 11.5 12.5 92 14.8 11.4 130 BONE SPRINGS DIV 9350 17.0 17.7 96 15.8 16.9 93 BURGESS JUNCTION 7880 13.3 13.3 100 14.5 14.1 103 CLOUD PEAK RESERVOIR 9860 19.6 15.7 125 19.2 15.4 125 DOME LAKE 8880 13.8 13.8 100 17.5 15.4 114 GRAVE SPRINGS 8550 10.2 11.0 93 11.5 11.9 97 HANSEN SAWMILL 8360 6.2 5.7 109 11.5 9.8 117 MIDDLE POWDER 7760 12.5 14.3 87 11.6 14.4 81 POWDER RIVER PASS 9480 12.6 11.7 108 16.0 14.4 111 SUCKER CREEK 8880 16.3 13.5 121 19.0 15.9 119 TIE CREEK 6870 5.9 5.2 113 16.1 12.0 134 ----- ----- Basin wide percent of average 106 110 BELLE FOURCHE BLIND PARK 6890 2.6 7.0 37 15.8 12.9 122 COLE CANYON 5910 6.6 6.8 97 13.8 8.1 170 NORTH RAPID CREEK 6130 6.8 8.1 84 16.0 10.0 160 ----- ----- Basin wide percent of average 73 147 UPPER N. PLATTE RIVER COLUMBINE 9160 27.4 24.0 114 30.3 27.8 109 DIVIDE PEAK 8880 27.7 20.9 133 30.4 23.0 132 ELK RIVER 8700 23.4 18.7 125 24.6 21.8 113 JOE WRIGHT 10120 26.5 24.3 109 32.3 28.1 115 NORTH FRENCH CREEK 10130 38.3 33.4 115 35.6 27.7 129 OLD BATTLE 10000 38.9 35.4 110 44.0 38.0 116 SAGE CREEK BASIN 7850 15.5 12.1 128 16.9 13.3 127 SOUTH BRUSH CREEK 8440 13.2 12.9 102 19.8 18.7 106 TOWER 10500 48.5 50.6 96 45.0 42.8 105 WEBBER SPRINGS 9250 29.2 26.0 112 33.5 29.6 113 WILLOW CREEK PASS 9540 14.6 14.0 104 14.6 14.6 100 ----- ----- Basin wide percent of average 111 115 LOWER N. PLATTE - SWEETWATER - LARAMIE BROOKLYN LAKE 10240 26.7 27.3 98 25.4 25.2 101 CASPER MTN. 7900 14.6 17.3 84 15.6 17.5 89 DEADMAN HILL 10220 21.5 18.9 114 21.7 19.4 112 DEER PARK 9700 15.0 18.0 83 20.4 25.0 82 LAPRELE CREEK 8375 9.3 9.5 98 15.2 14.9 102 RENO HILL 8400 17.3 16.0 108 19.7 18.2 108 ROACH 9700 19.5 18.5 105 22.3 21.0 106 SAND LAKE 10050 35.5 35.7 99 33.7 27.4 123 SOUTH PASS 9040 15.6 17.9 87 17.7 21.1 84 WINDY PEAK 7900 10.0 7.3 137 12.9 12.3 105 ----- ----- Basin wide percent of average 99 101 LITTLE SNAKE RIVER BATTLE MOUNTAIN 7440 15.4 7.5 205 20.6 17.6 117 DIVIDE PEAK 8880 27.7 20.9 133 30.4 23.0 132 OLD BATTLE 10000 38.9 35.4 110 44.0 38.0 116 SANDSTONE RS 8150 21.1 12.6 167 23.1 20.6 112 WHISKEY PARK 8950 36.1 30.6 118 38.0 31.9 119 ----- ----- Basin wide percent of average 130 119 UPPER GREEN RIVER BIG SANDY OPENING 9080 13.4 15.1 89 14.5 14.9 97 BLIND BULL SUM 8650 30.1 28.8 105 22.9 24.2 95 EAST RIM DIVIDE 7930 8.8 14.0 63 13.7 13.2 104 ELKHART PARK G.S. 9400 14.8 13.9 106 17.1 14.9 115 GROS VENTRE SUMMIT 8750 -M 14.4 * 17.4 14.4 121 GUNSIGHT PASS 9820 16.5 -M * 17.9 -M * KENDALL R.S. 7740 8.8 12.8 69 15.2 15.8 96 LOOMIS PARK 8240 15.9 16.5 96 20.8 19.0 109 NEW FORK LAKE 8340 11.3 10.8 105 12.5 12.6 99 SNIDER BASIN 8060 15.3 14.6 105 17.0 17.8 96 SPRING CREEK DIVIDE 9000 31.4 28.8 109 29.9 29.0 103 TRIPLE PEAK 8500 25.5 25.7 99 29.7 27.3 109 ----- ----- Basin wide percent of average 97 104 LOWER GREEN RIVER HAMS FORK 7840 10.8 8.9 121 14.3 13.8 104 HEWINTA 9519 12.4 11.7 106 15.7 16.7 94 HICKERSON PARK 9145 7.6 7.8 97 11.9 9.3 128 HOLE-IN-ROCK 9150 6.8 6.7 101 11.3 8.9 127 INDIAN CREEK 9425 27.7 29.6 94 25.6 28.2 91 KELLEY R.S. 8180 17.1 16.6 103 20.6 22.5 92 STEEL CREEK PARK 10200 16.8 17.7 95 19.2 19.0 101 ----- ----- Basin wide percent of average 100 100 UPPER BEAR RIVER BUG LAKE 7950 20.4 21.1 97 20.4 21.3 96 HAYDEN FORK 9212 17.7 15.8 112 25.1 23.7 106 KELLEY R.S. 8180 17.1 16.6 103 20.6 22.5 92 LILY LAKE 9156 16.0 13.8 116 19.6 19.9 98 MONTE CRISTO 8960 30.3 30.3 100 30.2 28.5 106 SALT RIVER SUMMIT 7760 15.4 13.6 113 18.6 20.7 90 TRIAL LAKE 9992 27.7 26.5 105 27.1 27.9 97 ----- ----- Basin wide percent of average 105 98 ----------------------------------------------------------------------------- -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.