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 MONDAY: MAY 4 , 2009 ----------------------------------------------------------------------------- BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Average Avg Current Average Avg ----------------------------------------------------------------------------- WYOMING SNAKE RIVER BASE CAMP 7030 9.2 11.5 80 22.7 24.5 93 COTTONWOOD CREEK 7670 27.6 19.0 145 37.5 32.2 116 GRAND TARGHEE 9260 54.9 -M * 41.6 -M * GRANITE CREEK 6770 11.4 12.2 93 24.4 22.6 108 GRASSY LAKE 7265 32.7 32.6 100 41.1 41.2 100 GROS VENTRE SUMMIT 8750 14.0 12.9 109 18.6 15.4 121 GUNSIGHT PASS 9820 17.8 -M * 20.1 -M * LEWIS LAKE DIVIDE 7850 36.7 34.0 108 39.8 41.9 95 PHILLIPS BENCH 8200 30.6 28.9 106 34.6 33.4 104 SALT RIVER SUMMIT 7760 13.7 9.9 138 20.0 21.8 92 SNAKE RIVER STATION 6920 12.8 11.4 112 27.5 25.7 107 SPRING CREEK DIVIDE 9000 32.8 28.3 116 31.9 30.4 105 THUMB DIVIDE 7980 20.8 14.3 145 25.9 22.2 117 TOGWOTEE PASS 9580 31.9 28.0 114 35.0 29.2 120 TWO OCEAN PLATEAU 9240 45.8 31.8 144 35.4 32.4 109 WILLOW CREEK 8380 36.2 30.1 120 47.1 38.0 124 ----- ----- Basin wide percent of average 117 107 UPPER YELLOWSTONE-MADISON BEARTOOTH LAKE 9360 26.8 26.0 103 24.9 23.8 105 BLACK BEAR 8170 41.6 39.5 105 42.5 46.2 92 CANYON 7870 14.8 10.7 138 18.9 17.9 106 FISHER CREEK 9100 40.9 37.7 108 40.6 42.2 96 MADISON PLATEAU 7750 25.7 23.7 108 30.2 30.6 99 NORTHEAST ENTRANCE 7350 5.2 6.3 83 16.3 15.0 109 PARKER PEAK 9400 32.5 24.6 132 22.8 19.7 116 SYLVAN LAKE 8420 22.8 23.4 97 28.5 25.0 114 THUMB DIVIDE 7980 20.8 14.3 145 25.9 22.2 117 TWO OCEAN PLATEAU 9240 45.8 31.8 144 35.4 32.4 109 WHISKEY CREEK 6800 19.0 14.5 131 25.1 24.4 103 WHITE MILL 8700 28.1 26.3 107 28.4 31.5 90 WOLVERINE 7650 9.0 6.6 136 15.3 15.4 99 ----- ----- Basin wide percent of average 117 102 WIND RIVER BURROUGHS CREEK 8750 18.8 13.2 142 20.9 19.5 107 COLD SPRINGS 9630 9.6 4.7 204 15.1 14.1 107 DEER PARK 9700 15.6 18.1 86 22.3 27.2 82 HOBBS PARK 10100 18.4 18.0 102 20.2 17.2 117 LITTLE WARM 9370 13.4 10.5 128 19.0 17.0 112 SOUTH PASS 9040 15.7 17.7 89 19.8 23.0 86 ST. LAWRENCE ALT 8620 7.7 5.8 133 14.5 12.3 118 TOGWOTEE PASS 9580 31.9 28.0 114 35.0 29.2 120 TOWNSEND CREEK 8700 11.5 8.6 134 17.3 15.8 109 ----- ----- Basin wide percent of average 114 105 BIGHORN BASIN BALD MTN. 9380 20.8 23.5 89 18.6 21.6 86 BEAR TRAP MEADOW 8200 5.8 2.1 276 12.0 11.1 108 BLACKWATER 9780 30.6 29.0 106 28.1 25.0 112 BONE SPRINGS DIV 9350 18.3 18.2 101 17.4 18.6 94 EVENING STAR 9200 32.6 33.3 98 36.3 30.2 120 GRAVE SPRINGS 8550 9.8 10.8 91 12.4 13.4 93 KIRWIN 9550 15.9 12.9 123 18.7 14.4 130 MARQUETTE 8760 9.1 11.0 83 12.6 14.0 90 MIDDLE POWDER 7760 12.1 14.0 86 12.7 16.0 79 OWL CREEK 8975 5.0 3.8 132 9.9 8.4 118 POWDER RIVER PASS 9480 12.8 10.2 125 18.5 16.1 115 SHELL CREEK 9580 18.8 16.7 113 18.6 17.1 109 SYLVAN LAKE 8420 22.8 23.4 97 28.5 25.0 114 SYLVAN ROAD 7120 6.6 7.6 87 23.0 20.7 111 TIMBER CREEK 7950 5.3 4.7 113 11.8 10.8 109 YOUNTS PEAK 8350 20.8 18.1 115 19.4 19.0 102 ----- ----- Basin wide percent of average 103 106 SHOSHONE RIVER BLACKWATER 9780 30.6 29.0 106 28.1 25.0 112 EVENING STAR 9200 32.6 33.3 98 36.3 30.2 120 KIRWIN 9550 15.9 12.9 123 18.7 14.4 130 MARQUETTE 8760 9.1 11.0 83 12.6 14.0 90 SYLVAN LAKE 8420 22.8 23.4 97 28.5 25.0 114 SYLVAN ROAD 7120 6.6 7.6 87 23.0 20.7 111 YOUNTS PEAK 8350 20.8 18.1 115 19.4 19.0 102 ----- ----- Basin wide percent of average 102 112 POWDER-TONGUE BEAR TRAP MEADOW 8200 5.8 2.1 276 12.0 11.1 108 BIG GOOSE 7990 11.0 11.3 97 15.9 13.2 120 BONE SPRINGS DIV 9350 18.3 18.2 101 17.4 18.6 94 BURGESS JUNCTION 7880 13.4 13.0 103 15.6 15.6 100 CLOUD PEAK RESERVOIR 9860 19.7 16.2 122 21.0 17.4 121 DOME LAKE 8880 12.7 13.1 97 18.8 17.1 110 GRAVE SPRINGS 8550 9.8 10.8 91 12.4 13.4 93 HANSEN SAWMILL 8360 3.9 4.6 85 12.9 11.2 115 MIDDLE POWDER 7760 12.1 14.0 86 12.7 16.0 79 POWDER RIVER PASS 9480 12.8 10.2 125 18.5 16.1 115 SUCKER CREEK 8880 15.9 12.7 125 20.6 17.7 116 TIE CREEK 6870 4.0 3.8 105 17.4 13.8 126 ----- ----- Basin wide percent of average 107 108 BELLE FOURCHE BLIND PARK 6890 .0 3.9 0 17.2 14.4 119 COLE CANYON 5910 4.4 4.1 107 15.0 9.8 153 NORTH RAPID CREEK 6130 1.3 3.1 42 16.9 11.6 146 ----- ----- Basin wide percent of average 51 137 UPPER N. PLATTE RIVER COLUMBINE 9160 17.5 20.0 88 32.3 29.4 110 DIVIDE PEAK 8880 26.5 18.6 142 33.3 24.5 136 ELK RIVER 8700 12.3 14.0 88 25.6 23.3 110 JOE WRIGHT 10120 27.4 25.1 109 34.4 30.4 113 NORTH FRENCH CREEK 10130 39.9 34.5 116 38.7 30.0 129 OLD BATTLE 10000 41.2 37.1 111 46.8 40.2 116 SAGE CREEK BASIN 7850 9.7 10.8 90 19.4 14.2 137 SOUTH BRUSH CREEK 8440 9.3 10.5 89 22.5 20.4 110 TOWER 10500 51.5 52.4 98 49.5 45.6 109 WEBBER SPRINGS 9250 24.5 24.5 100 35.5 31.4 113 WILLOW CREEK PASS 9540 13.3 14.0 95 15.4 15.9 97 ----- ----- Basin wide percent of average 104 116 LOWER N. PLATTE - SWEETWATER - LARAMIE BROOKLYN LAKE 10240 26.2 28.0 94 27.5 27.3 101 CASPER MTN. 7900 14.2 16.6 86 17.6 19.9 88 DEADMAN HILL 10220 22.9 19.7 116 23.6 21.2 111 DEER PARK 9700 15.6 18.1 86 22.3 27.2 82 LAPRELE CREEK 8375 8.9 6.6 135 16.7 16.7 100 RENO HILL 8400 15.6 14.2 110 21.3 20.6 103 ROACH 9700 18.3 18.1 101 24.1 22.7 106 SAND LAKE 10050 37.1 37.0 100 36.2 29.7 122 SOUTH PASS 9040 15.7 17.7 89 19.8 23.0 86 WINDY PEAK 7900 9.2 4.5 204 14.9 13.8 108 ----- ----- Basin wide percent of average 102 101 LITTLE SNAKE RIVER BATTLE MOUNTAIN 7440 1.3 4.0 32 22.7 18.8 121 DIVIDE PEAK 8880 26.5 18.6 142 33.3 24.5 136 OLD BATTLE 10000 41.2 37.1 111 46.8 40.2 116 SANDSTONE RS 8150 12.1 8.7 139 25.1 22.1 114 WHISKEY PARK 8950 31.8 30.3 105 40.5 34.2 118 ----- ----- Basin wide percent of average 114 120 UPPER GREEN RIVER BIG SANDY OPENING 9080 -M 13.0 * 16.2 16.1 101 BLIND BULL SUM 8650 31.3 27.6 113 24.3 25.4 96 EAST RIM DIVIDE 7930 4.5 12.8 35 14.4 14.0 103 ELKHART PARK G.S. 9400 15.0 12.5 120 18.6 16.2 115 GROS VENTRE SUMMIT 8750 14.0 12.9 109 18.6 15.4 121 GUNSIGHT PASS 9820 17.8 -M * 20.1 -M * KENDALL R.S. 7740 5.4 9.2 59 16.7 16.7 100 LOOMIS PARK 8240 12.8 13.8 93 21.7 20.1 108 NEW FORK LAKE 8340 8.9 7.9 113 13.8 13.6 101 SNIDER BASIN 8060 12.8 12.1 106 17.7 18.7 95 SPRING CREEK DIVIDE 9000 32.8 28.3 116 31.9 30.4 105 TRIPLE PEAK 8500 23.6 23.1 102 31.7 28.9 110 ----- ----- Basin wide percent of average 101 105 LOWER GREEN RIVER HAMS FORK 7840 5.8 5.3 109 15.3 14.9 103 HEWINTA 9519 4.0 8.6 47 17.2 18.0 96 HICKERSON PARK 9145 3.2 5.2 62 13.4 10.4 129 HOLE-IN-ROCK 9150 3.2 4.3 74 12.8 9.9 129 INDIAN CREEK 9425 -M 27.9 * 26.7 29.7 90 KELLEY R.S. 8180 14.9 13.5 110 21.8 23.8 92 STEEL CREEK PARK 10200 17.4 18.8 93 21.0 20.5 102 ----- ----- Basin wide percent of average 87 101 UPPER BEAR RIVER BUG LAKE 7950 17.3 17.2 101 21.8 22.6 96 HAYDEN FORK 9212 9.5 12.3 77 27.3 25.4 107 KELLEY R.S. 8180 14.9 13.5 110 21.8 23.8 92 LILY LAKE 9156 10.8 10.5 103 21.6 21.3 101 MONTE CRISTO 8960 27.0 27.7 97 31.9 30.6 104 SALT RIVER SUMMIT 7760 13.7 9.9 138 20.0 21.8 92 TRIAL LAKE 9992 26.6 26.3 101 29.7 29.7 100 ----- ----- Basin wide percent of average 102 99 ----------------------------------------------------------------------------- -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.