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 FRIDAY: MAY 22 , 2009 ----------------------------------------------------------------------------- BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Average Avg Current Average Avg ----------------------------------------------------------------------------- WYOMING SNAKE RIVER BASE CAMP 7030 .0 3.8 0 24.7 26.1 95 COTTONWOOD CREEK 7670 13.1 11.0 119 38.4 34.6 111 GRAND TARGHEE 9260 42.7 -M * 42.5 -M * GRANITE CREEK 6770 .2 5.4 4 26.3 24.0 110 GRASSY LAKE 7265 16.4 22.7 72 42.9 43.6 98 GROS VENTRE SUMMIT 8750 4.0 7.9 51 19.2 16.8 114 GUNSIGHT PASS 9820 13.6 -M * 20.9 -M * LEWIS LAKE DIVIDE 7850 26.3 25.5 103 42.1 44.2 95 PHILLIPS BENCH 8200 20.1 20.8 97 36.2 35.5 102 SALT RIVER SUMMIT 7760 .2 2.0 10 20.4 23.3 88 SNAKE RIVER STATION 6920 .0 2.6 0 28.8 27.4 105 SPRING CREEK DIVIDE 9000 23.6 21.7 109 32.8 32.2 102 THUMB DIVIDE 7980 6.6 7.1 93 27.5 23.9 115 TOGWOTEE PASS 9580 28.9 26.0 111 36.5 31.5 116 TWO OCEAN PLATEAU 9240 42.5 29.3 145 37.8 34.9 108 WILLOW CREEK 8380 22.0 21.9 100 48.5 41.1 118 ----- ----- Basin wide percent of average 98 105 UPPER YELLOWSTONE-MADISON BEARTOOTH LAKE 9360 24.4 24.2 101 27.5 25.9 106 BLACK BEAR 8170 36.5 33.9 108 45.3 48.8 93 CANYON 7870 6.5 4.7 138 20.3 19.5 104 FISHER CREEK 9100 40.4 34.5 117 45.2 45.1 100 MADISON PLATEAU 7750 18.1 16.3 111 32.1 32.9 98 NORTHEAST ENTRANCE 7350 .0 1.5 0 18.0 16.6 108 PARKER PEAK 9400 24.7 22.8 108 24.5 21.9 112 SYLVAN LAKE 8420 18.4 17.6 105 30.6 27.4 112 THUMB DIVIDE 7980 6.6 7.1 93 27.5 23.9 115 TWO OCEAN PLATEAU 9240 42.5 29.3 145 37.8 34.9 108 WHISKEY CREEK 6800 10.2 6.6 155 26.5 26.2 101 WHITE MILL 8700 26.1 23.0 113 31.6 33.8 93 WOLVERINE 7650 .0 1.5 0 17.2 17.3 99 ----- ----- Basin wide percent of average 114 103 WIND RIVER BURROUGHS CREEK 8750 12.0 8.2 146 21.8 21.5 101 COLD SPRINGS 9630 .0 2.0 0 15.7 16.1 98 DEER PARK 9700 8.4 15.9 53 23.0 29.7 77 HOBBS PARK 10100 12.4 15.1 82 21.2 19.7 108 LITTLE WARM 9370 3.3 5.4 61 19.8 19.0 104 SOUTH PASS 9040 4.5 11.0 41 20.1 25.1 80 ST. LAWRENCE ALT 8620 .0 1.9 0 14.6 14.2 103 TOGWOTEE PASS 9580 28.9 26.0 111 36.5 31.5 116 TOWNSEND CREEK 8700 .0 3.9 0 17.6 17.8 99 ----- ----- Basin wide percent of average 78 98 BIGHORN BASIN BALD MTN. 9380 18.3 21.6 85 20.0 24.1 83 BEAR TRAP MEADOW 8200 .0 .0 100 12.5 13.1 95 BLACKWATER 9780 29.5 28.5 104 31.0 27.4 113 BONE SPRINGS DIV 9350 13.4 14.0 96 19.0 21.0 90 EVENING STAR 9200 28.2 31.0 91 40.0 32.8 122 GRAVE SPRINGS 8550 .6 4.4 14 12.5 15.2 82 KIRWIN 9550 7.9 9.7 81 19.9 16.4 121 MARQUETTE 8760 .5 7.4 7 13.6 16.6 82 MIDDLE POWDER 7760 3.3 7.9 42 13.3 18.1 73 OWL CREEK 8975 .0 1.4 0 10.3 10.1 102 POWDER RIVER PASS 9480 6.3 5.8 109 19.5 18.4 106 SHELL CREEK 9580 15.7 14.8 106 20.3 19.3 105 SYLVAN LAKE 8420 18.4 17.6 105 30.6 27.4 112 SYLVAN ROAD 7120 .0 1.1 0 25.4 22.4 113 TIMBER CREEK 7950 .0 1.5 0 12.0 13.1 92 YOUNTS PEAK 8350 14.8 13.0 114 20.9 20.9 100 ----- ----- Basin wide percent of average 87 101 SHOSHONE RIVER BLACKWATER 9780 29.5 28.5 104 31.0 27.4 113 EVENING STAR 9200 28.2 31.0 91 40.0 32.8 122 KIRWIN 9550 7.9 9.7 81 19.9 16.4 121 MARQUETTE 8760 .5 7.4 7 13.6 16.6 82 SYLVAN LAKE 8420 18.4 17.6 105 30.6 27.4 112 SYLVAN ROAD 7120 .0 1.1 0 25.4 22.4 113 YOUNTS PEAK 8350 14.8 13.0 114 20.9 20.9 100 ----- ----- Basin wide percent of average 92 111 POWDER-TONGUE BEAR TRAP MEADOW 8200 .0 .0 100 12.5 13.1 95 BIG GOOSE 7990 3.1 7.6 41 16.6 15.4 108 BONE SPRINGS DIV 9350 13.4 14.0 96 19.0 21.0 90 BURGESS JUNCTION 7880 6.8 7.6 89 16.0 17.6 91 CLOUD PEAK RESERVOIR 9860 14.1 12.8 110 21.9 20.2 108 DOME LAKE 8880 3.1 7.8 40 19.7 19.5 101 GRAVE SPRINGS 8550 .6 4.4 14 12.5 15.2 82 HANSEN SAWMILL 8360 .0 1.0 0 13.2 13.0 102 MIDDLE POWDER 7760 3.3 7.9 42 13.3 18.1 73 POWDER RIVER PASS 9480 6.3 5.8 109 19.5 18.4 106 SUCKER CREEK 8880 9.3 8.1 115 21.5 20.3 106 TIE CREEK 6870 .0 .5 0 17.7 16.1 110 ----- ----- Basin wide percent of average 77 98 BELLE FOURCHE BLIND PARK 6890 .0 .0 100 18.2 16.6 110 COLE CANYON 5910 .0 .1 0 15.6 11.8 132 NORTH RAPID CREEK 6130 .0 .1 0 17.7 13.2 134 ----- ----- Basin wide percent of average 0 124 UPPER N. PLATTE RIVER COLUMBINE 9160 .0 8.7 0 33.2 31.3 106 DIVIDE PEAK 8880 5.8 9.3 62 33.4 26.5 126 ELK RIVER 8700 .1 4.6 2 26.0 25.1 104 JOE WRIGHT 10120 17.9 22.2 81 35.0 33.4 105 NORTH FRENCH CREEK 10130 28.8 30.9 93 39.6 32.9 120 OLD BATTLE 10000 33.8 32.8 103 47.4 43.0 110 SAGE CREEK BASIN 7850 .0 5.4 0 19.6 15.4 127 SOUTH BRUSH CREEK 8440 .0 4.5 0 22.7 22.6 100 TOWER 10500 40.4 49.6 81 51.0 48.6 105 WEBBER SPRINGS 9250 9.0 13.9 65 35.9 33.6 107 WILLOW CREEK PASS 9540 2.7 8.4 32 16.5 17.7 93 ----- ----- Basin wide percent of average 73 109 LOWER N. PLATTE - SWEETWATER - LARAMIE BROOKLYN LAKE 10240 13.4 19.3 69 28.4 29.9 95 CASPER MTN. 7900 1.0 8.7 11 17.4 22.7 77 DEADMAN HILL 10220 14.3 16.1 89 23.7 23.5 101 DEER PARK 9700 8.4 15.9 53 23.0 29.7 77 LAPRELE CREEK 8375 .0 2.3 0 16.9 19.0 89 RENO HILL 8400 3.9 7.1 55 21.4 23.4 91 ROACH 9700 4.6 10.6 43 24.3 25.1 97 SAND LAKE 10050 29.7 33.2 89 37.2 32.8 113 SOUTH PASS 9040 4.5 11.0 41 20.1 25.1 80 WINDY PEAK 7900 .6 .9 67 15.7 15.9 99 ----- ----- Basin wide percent of average 64 92 LITTLE SNAKE RIVER BATTLE MOUNTAIN 7440 .0 .0 100 22.9 20.2 113 DIVIDE PEAK 8880 5.8 9.3 62 33.4 26.5 126 OLD BATTLE 10000 33.8 32.8 103 47.4 43.0 110 SANDSTONE RS 8150 .2 2.0 10 25.3 23.9 106 WHISKEY PARK 8950 -M 22.8 * 40.8 36.7 111 ----- ----- Basin wide percent of average 90 113 UPPER GREEN RIVER BIG SANDY OPENING 9080 .5 6.5 8 16.9 17.7 95 BLIND BULL SUM 8650 30.1 22.9 131 25.6 27.1 94 EAST RIM DIVIDE 7930 .0 6.7 0 14.8 15.3 97 ELKHART PARK G.S. 9400 6.3 7.4 85 18.9 18.0 105 GROS VENTRE SUMMIT 8750 4.0 7.9 51 19.2 16.8 114 GUNSIGHT PASS 9820 13.6 -M * 20.9 -M * KENDALL R.S. 7740 .0 .5 0 17.4 17.9 97 LOOMIS PARK 8240 .1 7.2 1 22.4 21.7 103 NEW FORK LAKE 8340 .0 1.6 0 14.6 15.0 97 SNIDER BASIN 8060 -M 4.9 * 18.0 19.8 91 SPRING CREEK DIVIDE 9000 23.6 21.7 109 32.8 32.2 102 TRIPLE PEAK 8500 11.2 13.1 85 33.6 30.9 109 ----- ----- Basin wide percent of average 79 101 LOWER GREEN RIVER HAMS FORK 7840 .0 .0 100 16.0 16.3 98 HEWINTA 9519 .0 2.6 0 17.4 19.5 89 HICKERSON PARK 9145 .0 .9 0 13.5 11.8 114 HOLE-IN-ROCK 9150 .0 .7 0 12.8 11.4 112 INDIAN CREEK 9425 -M 20.9 * 27.4 31.5 87 KELLEY R.S. 8180 1.4 6.5 22 22.2 25.4 87 STEEL CREEK PARK 10200 9.2 16.4 56 21.1 22.2 95 ----- ----- Basin wide percent of average 39 94 UPPER BEAR RIVER BUG LAKE 7950 .5 7.5 7 22.0 24.3 91 HAYDEN FORK 9212 .1 4.8 2 27.3 27.4 100 KELLEY R.S. 8180 1.4 6.5 22 22.2 25.4 87 LILY LAKE 9156 .0 4.3 0 21.6 23.1 94 MONTE CRISTO 8960 10.9 19.4 56 32.0 32.9 97 SALT RIVER SUMMIT 7760 .2 2.0 10 20.4 23.3 88 TRIAL LAKE 9992 9.9 20.5 48 29.9 32.1 93 ----- ----- Basin wide percent of average 35 93 ----------------------------------------------------------------------------- -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.