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 WEDNESDAY: MAY 18 , 2011 ----------------------------------------------------------------------------- BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Average Avg Current Average Avg ----------------------------------------------------------------------------- WYOMING SNAKE RIVER BASE CAMP 7030 17.0 5.2 327 34.0 25.9 131 COTTONWOOD CREEK 7670 32.7 12.5 262 46.9 34.2 137 GRAND TARGHEE 9260 68.7 -M * -M -M * GRANITE CREEK 6770 18.9 6.7 282 33.1 23.8 139 GRASSY LAKE 7265 41.5 24.7 168 55.0 43.3 127 GROS VENTRE SUMMIT 8750 19.1 8.9 215 22.5 16.6 136 GUNSIGHT PASS 9820 -M -M * 25.9 -M * LEWIS LAKE DIVIDE 7850 52.0 27.3 190 49.1 43.8 112 PHILLIPS BENCH 8200 40.9 22.5 182 45.7 35.1 130 SALT RIVER SUMMIT 7760 13.9 3.4 409 27.8 23.1 120 SNAKE RIVER STATION 6920 -M 4.2 * 35.3 27.2 130 SPRING CREEK DIVIDE 9000 42.3 23.3 182 41.8 31.9 131 THUMB DIVIDE 7980 20.5 8.4 244 28.6 23.7 121 TOGWOTEE PASS 9580 41.4 26.8 154 43.4 31.2 139 TWO OCEAN PLATEAU 9240 52.2 30.1 173 43.0 34.5 125 WILLOW CREEK 8380 43.5 23.6 184 55.2 40.6 136 ----- ----- Basin wide percent of average 195 129 UPPER YELLOWSTONE-MADISON BEARTOOTH LAKE 9360 32.8 25.1 131 33.4 25.5 131 BLACK BEAR 8170 53.2 35.3 151 58.3 48.4 120 CANYON 7870 18.2 5.9 308 25.0 19.3 130 FISHER CREEK 9100 51.6 35.7 145 52.5 44.6 118 MADISON PLATEAU 7750 33.0 18.0 183 41.3 32.5 127 NORTHEAST ENTRANCE 7350 6.4 2.2 291 21.1 16.3 129 PARKER PEAK 9400 38.3 23.6 162 34.3 21.6 159 SYLVAN LAKE 8420 28.3 19.3 147 38.6 27.0 143 THUMB DIVIDE 7980 20.5 8.4 244 28.6 23.7 121 TWO OCEAN PLATEAU 9240 52.2 30.1 173 43.0 34.5 125 WHISKEY CREEK 6800 17.7 8.2 216 30.9 25.9 119 WHITE MILL 8700 36.2 23.9 151 38.2 33.5 114 WOLVERINE 7650 8.2 2.0 410 19.9 17.0 117 ----- ----- Basin wide percent of average 167 126 WIND RIVER BURROUGHS CREEK 8750 22.4 9.6 233 26.4 21.2 125 CASTLE CREEK 8400 .7 -M * 12.6 -M * COLD SPRINGS 9630 7.9 2.8 282 14.6 15.8 92 DEER PARK 9700 20.4 17.1 119 27.2 29.3 93 HOBBS PARK 10100 18.6 16.2 115 19.1 19.3 99 LITTLE WARM 9370 17.2 6.8 253 20.6 18.7 110 SOUTH PASS 9040 14.9 12.6 118 17.7 24.8 71 ST. LAWRENCE ALT 8620 .0 2.9 0 13.4 14.0 96 TOGWOTEE PASS 9580 41.4 26.8 154 43.4 31.2 139 TOWNSEND CREEK 8700 3.6 5.0 72 14.9 17.5 85 ----- ----- Basin wide percent of average 147 103 BIGHORN BASIN BALD MTN. 9380 33.5 22.5 149 28.3 23.8 119 BEAR TRAP MEADOW 8200 8.9 .4 2225* 14.7 12.8 115 BLACKWATER 9780 39.0 28.8 135 37.6 27.0 139 BONE SPRINGS DIV 9350 27.8 15.5 179 24.8 20.6 120 EVENING STAR 9200 40.3 31.8 127 46.8 32.4 144 GRAVE SPRINGS 8550 10.7 6.2 173 14.3 14.9 96 KIRWIN 9550 16.4 10.4 158 20.0 16.1 124 MARQUETTE 8760 9.3 -M * 13.8 16.2 85 MIDDLE POWDER 7760 14.2 9.6 148 15.5 17.8 87 OWL CREEK 8975 3.2 1.9 168 11.2 9.8 114 POWDER RIVER PASS 9480 20.7 7.1 292 26.4 18.0 147 SHELL CREEK 9580 24.4 15.8 154 24.0 19.0 126 SYLVAN LAKE 8420 28.3 19.3 147 38.6 27.0 143 SYLVAN ROAD 7120 5.8 2.0 290 28.9 22.1 131 TIMBER CREEK 7950 3.3 1.9 174 12.0 12.8 94 YOUNTS PEAK 8350 23.4 14.3 164 24.1 20.6 117 ----- ----- Basin wide percent of average 160 123 SHOSHONE RIVER BLACKWATER 9780 39.0 28.8 135 37.6 27.0 139 EVENING STAR 9200 40.3 31.8 127 46.8 32.4 144 KIRWIN 9550 16.4 10.4 158 20.0 16.1 124 MARQUETTE 8760 9.3 -M * 13.8 16.2 85 SYLVAN LAKE 8420 28.3 19.3 147 38.6 27.0 143 SYLVAN ROAD 7120 5.8 2.0 290 28.9 22.1 131 YOUNTS PEAK 8350 23.4 14.3 164 24.1 20.6 117 ----- ----- Basin wide percent of average 144 130 POWDER-TONGUE BEAR TRAP MEADOW 8200 8.9 .4 2225* 14.7 12.8 115 BIG GOOSE 7990 11.7 8.4 139 17.5 15.1 116 BONE SPRINGS DIV 9350 27.8 15.5 179 24.8 20.6 120 BURGESS JUNCTION 7880 14.1 8.9 158 18.7 17.3 108 CLOUD PEAK RESERVOIR 9860 20.6 14.2 145 22.9 19.8 116 DOME LAKE 8880 17.6 9.3 189 21.1 19.1 110 GRAVE SPRINGS 8550 10.7 6.2 173 14.3 14.9 96 HANSEN SAWMILL 8360 7.8 1.7 459 14.3 12.7 113 LITTLE GOOSE 8870 14.7 -M * 22.0 -M * MIDDLE POWDER 7760 14.2 9.6 148 15.5 17.8 87 POWDER RIVER PASS 9480 20.7 7.1 292 26.4 18.0 147 SOLDIER PARK 8720 9.8 -M * 15.0 -M * SUCKER CREEK 8880 18.6 9.1 204 23.5 19.9 118 TIE CREEK 6870 4.5 1.0 450 16.5 15.7 105 ----- ----- Basin wide percent of average 194 113 BELLE FOURCHE BLIND PARK 6890 1.9 .0 * 23.6 16.3 145 COLE CANYON 5910 .0 .4 0* 18.4 11.5 160 NORTH RAPID CREEK 6130 .0 .3 0* 18.5 12.9 143 ----- ----- Basin wide percent of average 271* 149 UPPER N. PLATTE RIVER CINNABAR PARK 9574 30.2 9.3 325 43.3 25.7 168 COLUMBINE 9160 30.9 10.9 283 45.3 31.0 146 DIVIDE PEAK 8880 26.7 11.0 243 38.7 26.2 148 ELK RIVER 8700 21.2 6.0 353 35.0 24.8 141 JOE WRIGHT 10120 49.5 23.1 214 49.9 32.9 152 NORTH FRENCH CREEK 10130 60.5 32.2 188 -M 32.5 * OLD BATTLE 10000 57.1 34.3 166 62.8 42.6 147 SAGE CREEK BASIN 7850 4.9 6.4 77 24.8 15.2 163 SOUTH BRUSH CREEK 8440 16.4 5.5 298 31.7 22.3 142 TOWER 10500 74.0 50.7 146 -M 48.2 * WEBBER SPRINGS 9250 34.4 16.0 215 47.9 33.3 144 WILLOW CREEK PASS 9540 24.4 9.9 246 26.4 17.4 152 ----- ----- Basin wide percent of average 200 150 LOWER N. PLATTE - SWEETWATER - LARAMIE BROOKLYN LAKE 10240 38.5 21.3 181 42.3 29.6 143 CASPER MTN. 7900 9.0 10.2 88 19.9 22.3 89 DEADMAN HILL 10220 30.2 17.2 176 32.4 23.2 140 DEER PARK 9700 20.4 17.1 119 27.2 29.3 93 LAPRELE CREEK 8375 9.1 2.9 314 19.6 18.6 105 RENO HILL 8400 16.4 8.4 195 24.8 23.0 108 ROACH 9700 24.9 12.0 208 32.7 24.8 132 SAND LAKE 10050 49.7 34.5 144 48.9 32.3 151 SOUTH PASS 9040 14.9 12.6 118 17.7 24.8 71 WINDY PEAK 7900 3.9 1.2 325 17.9 15.6 115 ----- ----- Basin wide percent of average 158 116 LITTLE SNAKE RIVER BATTLE MOUNTAIN 7440 -M .0 * 23.1 20.0 116 DIVIDE PEAK 8880 26.7 11.0 243 38.7 26.2 148 OLD BATTLE 10000 57.1 34.3 166 62.8 42.6 147 SANDSTONE RS 8150 14.1 2.8 504 34.8 23.6 147 WHISKEY PARK 8950 -M 24.8 * 55.1 36.4 151 ----- ----- Basin wide percent of average 204 144 UPPER GREEN RIVER BIG SANDY OPENING 9080 16.1 7.8 206 20.9 17.5 119 BLIND BULL SUM 8650 44.8 24.0 187 31.1 26.9 116 EAST RIM DIVIDE 7930 6.9 8.0 86 18.7 15.1 124 ELKHART PARK G.S. 9400 16.0 8.5 188 18.9 17.7 107 GROS VENTRE SUMMIT 8750 19.1 8.9 215 22.5 16.6 136 GUNSIGHT PASS 9820 -M -M * 25.9 -M * KENDALL R.S. 7740 9.0 2.1 429 22.3 17.7 126 LOOMIS PARK 8240 19.6 8.5 231 29.4 21.4 137 NEW FORK LAKE 8340 8.5 2.7 315 15.6 14.8 105 POCKET CREEK 9360 14.8 -M * 19.7 -M * SNIDER BASIN 8060 15.7 6.3 249 24.4 19.6 124 SPRING CREEK DIVIDE 9000 42.3 23.3 182 41.8 31.9 131 TRIPLE PEAK 8500 36.2 15.2 238 44.8 30.6 146 ----- ----- Basin wide percent of average 203 126 LOWER GREEN RIVER HAMS FORK 7840 5.2 .0 * 19.6 16.1 122 HEWINTA 9519 11.6 3.5 331 25.2 19.3 131 HICKERSON PARK 9145 .0 1.4 0 15.4 11.6 133 HOLE-IN-ROCK 9150 1.6 1.2 133 17.0 11.2 152 INDIAN CREEK 9425 36.2 22.4 162 34.5 31.3 110 KELLEY R.S. 8180 18.5 7.8 237 30.5 25.1 122 STEEL CREEK PARK 10200 26.4 17.4 152 29.4 21.9 134 ----- ----- Basin wide percent of average 185 126 UPPER BEAR RIVER BUG LAKE 7950 30.3 9.2 329 37.0 24.0 154 HAYDEN FORK 9212 19.7 6.1 323 39.6 27.1 146 KELLEY R.S. 8180 18.5 7.8 237 30.5 25.1 122 LILY LAKE 9156 22.1 5.3 417 31.0 22.8 136 MONTE CRISTO 8960 45.3 21.1 215 48.0 32.6 147 SALT RIVER SUMMIT 7760 13.9 3.4 409 27.8 23.1 120 TRIAL LAKE 9992 49.9 21.9 228 44.7 31.7 141 ----- ----- Basin wide percent of average 267 139 ----------------------------------------------------------------------------- -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.