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: MAY 12 , 2009 ----------------------------------------------------------------------------- BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Average Avg Current Average Avg ----------------------------------------------------------------------------- WYOMING SNAKE RIVER BASE CAMP 7030 5.6 8.3 67 24.1 25.2 96 COTTONWOOD CREEK 7670 23.5 15.8 149 38.5 33.4 115 GRAND TARGHEE 9260 55.1 -M * 43.0 -M * GRANITE CREEK 6770 8.1 9.4 86 25.5 23.2 110 GRASSY LAKE 7265 28.2 28.8 98 42.7 42.3 101 GROS VENTRE SUMMIT 8750 12.1 11.0 110 19.3 16.1 120 GUNSIGHT PASS 9820 18.1 -M * 20.7 -M * LEWIS LAKE DIVIDE 7850 36.2 30.9 117 41.4 43.0 96 PHILLIPS BENCH 8200 29.0 26.0 112 35.9 34.3 105 SALT RIVER SUMMIT 7760 9.5 6.7 142 20.4 22.5 91 SNAKE RIVER STATION 6920 8.4 7.7 109 28.6 26.5 108 SPRING CREEK DIVIDE 9000 32.1 26.2 123 32.6 31.2 104 THUMB DIVIDE 7980 18.3 11.3 162 26.9 23.0 117 TOGWOTEE PASS 9580 32.9 27.9 118 36.1 30.3 119 TWO OCEAN PLATEAU 9240 47.7 31.2 153 36.9 33.5 110 WILLOW CREEK 8380 33.1 27.2 122 48.3 39.5 122 ----- ----- Basin wide percent of average 121 108 UPPER YELLOWSTONE-MADISON BEARTOOTH LAKE 9360 28.1 25.9 108 26.5 24.7 107 BLACK BEAR 8170 43.6 37.8 115 44.9 47.4 95 CANYON 7870 14.8 8.3 178 19.8 18.6 106 FISHER CREEK 9100 43.8 37.5 117 43.6 43.5 100 MADISON PLATEAU 7750 24.4 21.2 115 31.6 31.6 100 NORTHEAST ENTRANCE 7350 1.4 4.7 30 17.4 15.7 111 PARKER PEAK 9400 32.9 24.3 135 23.9 20.7 115 SYLVAN LAKE 8420 22.8 21.6 106 29.8 26.0 115 THUMB DIVIDE 7980 18.3 11.3 162 26.9 23.0 117 TWO OCEAN PLATEAU 9240 47.7 31.2 153 36.9 33.5 110 WHISKEY CREEK 6800 17.1 11.7 146 26.4 25.2 105 WHITE MILL 8700 30.5 25.7 119 30.8 32.6 94 WOLVERINE 7650 4.8 4.5 107 16.6 16.2 102 ----- ----- Basin wide percent of average 124 105 WIND RIVER BURROUGHS CREEK 8750 18.3 11.2 163 21.7 20.4 106 COLD SPRINGS 9630 6.7 4.1 163 15.7 15.1 104 DEER PARK 9700 14.6 16.8 87 23.0 28.2 82 HOBBS PARK 10100 17.6 17.4 101 20.9 18.4 114 LITTLE WARM 9370 12.0 8.7 138 19.6 18.0 109 SOUTH PASS 9040 13.4 15.5 86 20.1 24.1 83 ST. LAWRENCE ALT 8620 -M 4.7 * -M 13.3 * TOGWOTEE PASS 9580 32.9 27.9 118 36.1 30.3 119 TOWNSEND CREEK 8700 8.4 6.8 124 17.3 16.8 103 ----- ----- Basin wide percent of average 114 102 BIGHORN BASIN BALD MTN. 9380 21.9 23.5 93 19.7 22.8 86 BEAR TRAP MEADOW 8200 1.5 1.3 115 12.3 12.0 103 BLACKWATER 9780 32.2 28.7 112 29.7 26.1 114 BONE SPRINGS DIV 9350 18.7 17.1 109 18.7 19.7 95 EVENING STAR 9200 34.4 33.0 104 39.0 31.4 124 GRAVE SPRINGS 8550 8.0 9.4 85 12.5 14.3 87 KIRWIN 9550 15.3 12.0 128 19.7 15.4 128 MARQUETTE 8760 8.0 9.8 82 12.9 15.2 85 MIDDLE POWDER 7760 10.7 12.1 88 13.1 17.0 77 OWL CREEK 8975 .6 3.0 20 10.3 9.1 113 POWDER RIVER PASS 9480 12.7 9.0 141 19.2 17.1 112 SHELL CREEK 9580 19.5 16.8 116 19.9 18.1 110 SYLVAN LAKE 8420 22.8 21.6 106 29.8 26.0 115 SYLVAN ROAD 7120 .4 4.1 10 24.4 21.5 113 TIMBER CREEK 7950 2.0 3.0 67 12.0 11.9 101 YOUNTS PEAK 8350 20.6 16.6 124 20.5 19.8 104 ----- ----- Basin wide percent of average 104 105 SHOSHONE RIVER BLACKWATER 9780 32.2 28.7 112 29.7 26.1 114 EVENING STAR 9200 34.4 33.0 104 39.0 31.4 124 KIRWIN 9550 15.3 12.0 128 19.7 15.4 128 MARQUETTE 8760 8.0 9.8 82 12.9 15.2 85 SYLVAN LAKE 8420 22.8 21.6 106 29.8 26.0 115 SYLVAN ROAD 7120 .4 4.1 10 24.4 21.5 113 YOUNTS PEAK 8350 20.6 16.6 124 20.5 19.8 104 ----- ----- Basin wide percent of average 106 113 POWDER-TONGUE BEAR TRAP MEADOW 8200 1.5 1.3 115 12.3 12.0 103 BIG GOOSE 7990 9.9 9.9 100 16.4 14.3 115 BONE SPRINGS DIV 9350 18.7 17.1 109 18.7 19.7 95 BURGESS JUNCTION 7880 12.3 11.4 108 15.8 16.6 95 CLOUD PEAK RESERVOIR 9860 19.3 15.5 125 21.6 18.8 115 DOME LAKE 8880 11.1 11.4 97 19.5 18.2 107 GRAVE SPRINGS 8550 8.0 9.4 85 12.5 14.3 87 HANSEN SAWMILL 8360 .2 3.2 6 13.3 12.0 111 MIDDLE POWDER 7760 10.7 12.1 88 13.1 17.0 77 POWDER RIVER PASS 9480 12.7 9.0 141 19.2 17.1 112 SUCKER CREEK 8880 15.1 11.2 135 21.2 19.0 112 TIE CREEK 6870 .3 2.4 12 17.6 14.9 118 ----- ----- Basin wide percent of average 105 104 BELLE FOURCHE BLIND PARK 6890 -M 1.3 * 17.9 15.4 116 COLE CANYON 5910 .2 1.4 14 15.5 10.8 144 NORTH RAPID CREEK 6130 .0 1.1 0 17.3 12.4 140 ----- ----- Basin wide percent of average 8 131 UPPER N. PLATTE RIVER COLUMBINE 9160 9.5 15.7 61 33.2 30.3 110 DIVIDE PEAK 8880 21.6 15.0 144 33.5 25.4 132 ELK RIVER 8700 2.8 9.8 29 26.1 24.1 108 JOE WRIGHT 10120 25.4 24.6 103 34.9 31.8 110 NORTH FRENCH CREEK 10130 39.5 34.0 116 39.7 31.4 126 OLD BATTLE 10000 40.5 36.6 111 47.3 41.6 114 SAGE CREEK BASIN 7850 .7 8.7 8 19.5 14.8 132 SOUTH BRUSH CREEK 8440 2.8 7.9 35 22.9 21.4 107 TOWER 10500 49.4 52.2 95 50.8 47.1 108 WEBBER SPRINGS 9250 19.6 20.6 95 35.7 32.5 110 WILLOW CREEK PASS 9540 10.7 12.6 85 16.0 16.7 96 ----- ----- Basin wide percent of average 94 113 LOWER N. PLATTE - SWEETWATER - LARAMIE BROOKLYN LAKE 10240 23.5 25.3 93 28.3 28.6 99 CASPER MTN. 7900 11.1 13.7 81 17.5 21.2 83 DEADMAN HILL 10220 20.7 18.9 110 23.8 22.4 106 DEER PARK 9700 14.6 16.8 87 23.0 28.2 82 LAPRELE CREEK 8375 5.6 4.6 122 17.1 17.8 96 RENO HILL 8400 12.5 11.4 110 21.5 21.9 98 ROACH 9700 14.1 15.3 92 24.2 23.9 101 SAND LAKE 10050 36.3 36.4 100 36.9 31.2 118 SOUTH PASS 9040 13.4 15.5 86 20.1 24.1 83 WINDY PEAK 7900 4.8 2.5 192 15.5 14.7 105 ----- ----- Basin wide percent of average 98 97 LITTLE SNAKE RIVER BATTLE MOUNTAIN 7440 .0 1.7 0 23.0 19.5 118 DIVIDE PEAK 8880 21.6 15.0 144 33.5 25.4 132 OLD BATTLE 10000 40.5 36.6 111 47.3 41.6 114 SANDSTONE RS 8150 2.8 5.3 53 25.4 23.0 110 WHISKEY PARK 8950 28.5 28.3 101 40.8 35.5 115 ----- ----- Basin wide percent of average 107 117 UPPER GREEN RIVER BIG SANDY OPENING 9080 10.5 10.5 100 16.7 16.9 99 BLIND BULL SUM 8650 32.1 26.0 123 25.4 26.2 97 EAST RIM DIVIDE 7930 .0 10.6 0 14.6 14.6 100 ELKHART PARK G.S. 9400 13.5 10.6 127 18.9 17.0 111 GROS VENTRE SUMMIT 8750 12.1 11.0 110 19.3 16.1 120 GUNSIGHT PASS 9820 18.1 -M * 20.7 -M * KENDALL R.S. 7740 .8 5.7 14 17.3 17.2 101 LOOMIS PARK 8240 9.7 11.2 87 22.3 20.8 107 NEW FORK LAKE 8340 5.1 5.3 96 14.3 14.2 101 SNIDER BASIN 8060 8.3 9.3 89 18.2 19.2 95 SPRING CREEK DIVIDE 9000 32.1 26.2 123 32.6 31.2 104 TRIPLE PEAK 8500 21.3 19.4 110 33.5 29.9 112 ----- ----- Basin wide percent of average 100 104 LOWER GREEN RIVER HAMS FORK 7840 .2 2.6 8 15.9 15.6 102 HEWINTA 9519 .0 5.9 0 17.3 18.7 93 HICKERSON PARK 9145 .0 3.1 0 13.4 11.0 122 HOLE-IN-ROCK 9150 .0 2.5 0 12.8 10.6 121 INDIAN CREEK 9425 -M 25.4 * 27.4 30.6 90 KELLEY R.S. 8180 11.4 10.7 107 22.2 24.5 91 STEEL CREEK PARK 10200 15.3 18.7 82 21.0 21.3 99 ----- ----- Basin wide percent of average 62 98 UPPER BEAR RIVER BUG LAKE 7950 12.3 13.1 94 22.0 23.4 94 HAYDEN FORK 9212 1.2 9.1 13 27.3 26.3 104 KELLEY R.S. 8180 11.4 10.7 107 22.2 24.5 91 LILY LAKE 9156 2.4 7.7 31 21.5 22.2 97 MONTE CRISTO 8960 22.1 24.6 90 32.0 31.7 101 SALT RIVER SUMMIT 7760 9.5 6.7 142 20.4 22.5 91 TRIAL LAKE 9992 21.4 24.6 87 29.7 30.8 96 ----- ----- Basin wide percent of average 83 97 ----------------------------------------------------------------------------- -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.