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 SATURDAY: MAY 21 , 2011 ----------------------------------------------------------------------------- BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Average Avg Current Average Avg ----------------------------------------------------------------------------- WYOMING SNAKE RIVER BASE CAMP 7030 15.5 3.8 408 34.1 26.1 131 COTTONWOOD CREEK 7670 31.8 11.0 289 48.0 34.6 139 GRAND TARGHEE 9260 68.2 -M * -M -M * GRANITE CREEK 6770 17.6 5.4 326 33.1 24.0 138 GRASSY LAKE 7265 39.5 22.7 174 55.2 43.6 127 GROS VENTRE SUMMIT 8750 18.6 7.9 235 22.7 16.8 135 GUNSIGHT PASS 9820 -M -M * 26.5 -M * LEWIS LAKE DIVIDE 7850 49.6 25.5 195 49.4 44.2 112 PHILLIPS BENCH 8200 40.2 20.8 193 45.8 35.5 129 SALT RIVER SUMMIT 7760 13.1 2.0 655 28.3 23.3 121 SNAKE RIVER STATION 6920 -M 2.6 * 35.4 27.4 129 SPRING CREEK DIVIDE 9000 42.7 21.7 197 42.5 32.2 132 THUMB DIVIDE 7980 18.6 7.1 262 28.7 23.9 120 TOGWOTEE PASS 9580 41.5 26.0 160 43.6 31.5 138 TWO OCEAN PLATEAU 9240 52.0 29.3 177 43.4 34.9 124 WILLOW CREEK 8380 43.1 21.9 197 56.0 41.1 136 ----- ----- Basin wide percent of average 207 129 UPPER YELLOWSTONE-MADISON BEARTOOTH LAKE 9360 33.7 24.2 139 34.5 25.9 133 BLACK BEAR 8170 51.7 33.9 153 58.5 48.8 120 CANYON 7870 16.1 4.7 343 25.0 19.5 128 FISHER CREEK 9100 53.3 34.5 154 53.7 45.1 119 MADISON PLATEAU 7750 31.0 16.3 190 41.3 32.9 126 NORTHEAST ENTRANCE 7350 5.3 1.6 331 21.9 16.6 132 PARKER PEAK 9400 38.3 22.8 168 38.2 21.9 174 SYLVAN LAKE 8420 27.7 17.6 157 38.9 27.4 142 THUMB DIVIDE 7980 18.6 7.1 262 28.7 23.9 120 TWO OCEAN PLATEAU 9240 52.0 29.3 177 43.4 34.9 124 WHISKEY CREEK 6800 15.9 6.6 241 30.8 26.2 118 WHITE MILL 8700 36.6 23.0 159 38.8 33.8 115 WOLVERINE 7650 7.4 1.5 493 20.0 17.3 116 ----- ----- Basin wide percent of average 174 127 WIND RIVER BURROUGHS CREEK 8750 21.9 8.2 267 26.5 21.5 123 CASTLE CREEK 8400 .3 -M * 13.1 -M * COLD SPRINGS 9630 11.5 2.0 575 18.1 16.1 112 DEER PARK 9700 23.7 15.9 149 30.7 29.7 103 HOBBS PARK 10100 24.2 15.1 160 24.3 19.7 123 LITTLE WARM 9370 -M 5.4 * 20.8 19.0 109 SOUTH PASS 9040 19.9 11.0 181 22.8 25.1 91 ST. LAWRENCE ALT 8620 4.4 1.9 232 17.4 14.3 122 TOGWOTEE PASS 9580 41.5 26.0 160 43.6 31.5 138 TOWNSEND CREEK 8700 8.6 3.9 221 19.8 17.8 111 ----- ----- Basin wide percent of average 185 115 BIGHORN BASIN BALD MTN. 9380 -M 21.6 * 29.6 24.1 123 BEAR TRAP MEADOW 8200 10.3 .0 * 16.3 13.1 124 BLACKWATER 9780 39.8 28.5 140 38.4 27.4 140 BONE SPRINGS DIV 9350 -M 14.0 * 26.4 21.0 126 EVENING STAR 9200 40.4 31.0 130 47.4 32.8 145 GRAVE SPRINGS 8550 12.9 4.4 293 16.6 15.2 109 KIRWIN 9550 18.7 9.7 193 22.4 16.4 137 MARQUETTE 8760 13.6 -M * 17.8 16.6 107 MIDDLE POWDER 7760 -M 7.9 * 17.3 18.1 96 OWL CREEK 8975 4.2 1.4 300 12.1 10.1 120 POWDER RIVER PASS 9480 21.4 5.8 369 27.2 18.4 148 SHELL CREEK 9580 26.2 14.8 177 -M 19.3 * SYLVAN LAKE 8420 27.7 17.6 157 38.9 27.4 142 SYLVAN ROAD 7120 3.5 1.1 318* 29.0 22.4 129 TIMBER CREEK 7950 5.2 1.5 347 14.0 13.2 106 YOUNTS PEAK 8350 22.8 13.0 175 24.2 20.9 116 ----- ----- Basin wide percent of average 181 127 SHOSHONE RIVER BLACKWATER 9780 39.8 28.5 140 38.4 27.4 140 EVENING STAR 9200 40.4 31.0 130 47.4 32.8 145 KIRWIN 9550 18.7 9.7 193 22.4 16.4 137 MARQUETTE 8760 13.6 -M * 17.8 16.6 107 SYLVAN LAKE 8420 27.7 17.6 157 38.9 27.4 142 SYLVAN ROAD 7120 3.5 1.1 318* 29.0 22.4 129 YOUNTS PEAK 8350 22.8 13.0 175 24.2 20.9 116 ----- ----- Basin wide percent of average 152 133 POWDER-TONGUE BEAR TRAP MEADOW 8200 10.3 .0 * 16.3 13.1 124 BIG GOOSE 7990 -M 7.6 * 20.4 15.4 132 BONE SPRINGS DIV 9350 -M 14.0 * 26.4 21.0 126 BURGESS JUNCTION 7880 16.4 7.6 216 21.4 17.6 122 CLOUD PEAK RESERVOIR 9860 23.5 12.8 184 25.0 20.2 124 DOME LAKE 8880 20.3 7.8 260 23.5 19.5 121 GRAVE SPRINGS 8550 12.9 4.4 293 16.6 15.2 109 HANSEN SAWMILL 8360 -M 1.0 * 16.4 13.0 126 LITTLE GOOSE 8870 18.3 -M * 25.0 -M * MIDDLE POWDER 7760 -M 7.9 * 17.3 18.1 96 POWDER RIVER PASS 9480 21.4 5.8 369 27.2 18.4 148 SOLDIER PARK 8720 11.5 -M * 16.8 -M * SUCKER CREEK 8880 -M 8.1 * -M 20.3 * TIE CREEK 6870 6.5 .5 1300* 19.6 16.1 122 ----- ----- Basin wide percent of average 286* 123 BELLE FOURCHE BLIND PARK 6890 1.2 .0 * 24.6 16.6 148 COLE CANYON 5910 .2 .1 200* 19.3 11.8 164 NORTH RAPID CREEK 6130 .0 .1 0* 20.3 13.2 154 ----- ----- Basin wide percent of average 700* 154 UPPER N. PLATTE RIVER CINNABAR PARK 9574 30.2 7.4 408 45.0 26.0 173 COLUMBINE 9160 -M 8.7 * 46.6 31.3 149 DIVIDE PEAK 8880 27.8 9.3 299 40.0 26.5 151 ELK RIVER 8700 -M 4.6 * 36.2 25.1 144 JOE WRIGHT 10120 51.2 22.2 231 51.2 33.4 153 NORTH FRENCH CREEK 10130 62.4 30.9 202 -M 32.9 * OLD BATTLE 10000 58.1 32.8 177 64.1 43.0 149 SAGE CREEK BASIN 7850 4.4 5.4 81 25.6 15.4 166 SOUTH BRUSH CREEK 8440 17.1 4.5 380 32.7 22.6 145 TOWER 10500 76.2 49.6 154 68.7 48.6 141 WEBBER SPRINGS 9250 34.0 13.9 245 49.0 33.6 146 WILLOW CREEK PASS 9540 -M 8.4 * 28.1 17.7 159 ----- ----- Basin wide percent of average 205 151 LOWER N. PLATTE - SWEETWATER - LARAMIE BROOKLYN LAKE 10240 40.8 19.3 211 -M 29.9 * CASPER MTN. 7900 10.2 8.7 117 21.5 22.7 95 DEADMAN HILL 10220 31.6 16.1 196 33.7 23.5 143 DEER PARK 9700 23.7 15.9 149 30.7 29.7 103 LAPRELE CREEK 8375 9.6 2.3 417 20.6 19.0 108 RENO HILL 8400 17.3 7.1 244 25.6 23.4 109 ROACH 9700 26.2 10.6 247 34.2 25.1 136 SAND LAKE 10050 51.6 33.2 155 50.5 32.8 154 SOUTH PASS 9040 19.9 11.0 181 22.8 25.1 91 WINDY PEAK 7900 4.2 .9 467 19.0 15.9 119 ----- ----- Basin wide percent of average 188 119 LITTLE SNAKE RIVER BATTLE MOUNTAIN 7440 -M .0 * 24.0 20.2 119 DIVIDE PEAK 8880 27.8 9.3 299 40.0 26.5 151 OLD BATTLE 10000 58.1 32.8 177 64.1 43.0 149 SANDSTONE RS 8150 13.6 2.0 680 35.7 23.9 149 WHISKEY PARK 8950 -M 22.8 * 56.3 36.7 153 ----- ----- Basin wide percent of average 226 146 UPPER GREEN RIVER BIG SANDY OPENING 9080 15.4 6.5 237 21.1 17.7 119 BLIND BULL SUM 8650 43.4 22.9 190 31.2 27.1 115 EAST RIM DIVIDE 7930 5.2 6.7 78 18.8 15.3 123 ELKHART PARK G.S. 9400 15.7 7.4 212 19.2 18.0 107 GROS VENTRE SUMMIT 8750 18.6 7.9 235 22.7 16.8 135 GUNSIGHT PASS 9820 -M -M * 26.5 -M * KENDALL R.S. 7740 7.8 .5 1560* 22.4 17.9 125 LOOMIS PARK 8240 18.2 7.2 253 29.5 21.7 136 NEW FORK LAKE 8340 7.8 1.6 488 15.9 15.0 106 POCKET CREEK 9360 15.2 -M * 20.2 -M * SNIDER BASIN 8060 16.0 4.9 327 25.4 19.8 128 SPRING CREEK DIVIDE 9000 42.7 21.7 197 42.5 32.2 132 TRIPLE PEAK 8500 36.2 13.1 276 45.2 30.9 146 ----- ----- Basin wide percent of average 226 126 LOWER GREEN RIVER HAMS FORK 7840 5.9 .0 * 21.2 16.3 130 HEWINTA 9519 13.6 2.6 523 27.1 19.5 139 HICKERSON PARK 9145 1.1 .9 122 17.1 11.8 145 HOLE-IN-ROCK 9150 3.6 .7 514* 18.9 11.4 166 INDIAN CREEK 9425 37.7 20.9 180 36.0 31.5 114 KELLEY R.S. 8180 18.9 6.5 291 31.5 25.4 124 STEEL CREEK PARK 10200 28.5 16.4 174 31.4 22.2 141 ----- ----- Basin wide percent of average 228 133 UPPER BEAR RIVER BUG LAKE 7950 32.9 7.5 439 39.3 24.3 162 HAYDEN FORK 9212 20.8 4.8 433 41.2 27.4 150 KELLEY R.S. 8180 18.9 6.5 291 31.5 25.4 124 LILY LAKE 9156 24.2 4.3 563 32.6 23.1 141 MONTE CRISTO 8960 47.8 19.4 246 50.4 32.9 153 SALT RIVER SUMMIT 7760 13.1 2.0 655 28.3 23.3 121 TRIAL LAKE 9992 51.2 20.5 250 46.2 32.1 144 ----- ----- Basin wide percent of average 321 143 ----------------------------------------------------------------------------- -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.