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 10 , 2017 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7030 13.4 4.4 305 42.3 23.6 179 Black Bear 8170 48.3 36.8 131 59.9 43.1 139 Blind Bull Sum 8650 -M 22.4 * 39.2 22.2 177 Cottonwood Creek 7670 24.0 12.8 188 44.1 28.8 153 East Rim Divide 7930 .4 5.9 7 23.1 13.5 171 Grand Targhee 9260 57.0 46.4 123 51.7 36.1 143 Granite Creek 6770 16.0 5.5 291 38.4 22.1 174 Grassy Lake 7265 31.5 25.9 122 61.5 40.6 151 Gros Ventre Summit 8750 17.7 9.6 184 26.7 15.4 173 Gunsight Pass 9820 23.5 12.1 194 28.6 16.9 169 Lewis Lake Divide 7850 41.5 29.3 142 59.8 39.7 151 Phillips Bench 8200 36.7 23.1 159 50.8 31.8 160 Salt River Summit 7760 10.1 4.5 224 32.0 19.1 168 Snake River Station 6920 4.9 2.5 196 39.2 25.6 153 Spring Creek Divide 9000 43.3 23.7 183 44.9 27.1 166 Thumb Divide 7980 12.1 8.4 144 30.6 21.8 140 Togwotee Pass 9580 35.0 25.4 138 43.3 28.5 152 Two Ocean Plateau 9240 -M 29.6 * -M 31.2 * Willow Creek 8380 22.9 21.1 109 57.7 39.2 147 Younts Peak 8350 14.0 15.4 91 33.8 18.5 183 ----- ----- Basin Index (%) 145 157 MADISON-GALLATIN Black Bear 8170 48.3 36.8 131 59.9 43.1 139 Canyon 7870 13.6 7.4 184 28.9 18.8 154 Madison Plateau 7750 23.6 20.0 118 40.1 30.0 134 West Yellowstone 6700 .0 .0 * 26.0 16.6 157 Whiskey Creek 6800 8.2 10.7 77 29.9 23.1 129 ----- ----- Basin Index (%) 125 140 YELLOWSTONE Beartooth Lake 9360 34.5 23.0 150 31.8 23.1 138 Burnt Mtn 5880 .0 .0 * 18.7 17.4 107 Canyon 7870 13.6 7.4 184 28.9 18.8 154 Cole Creek 7850 14.5 17.2 84 14.3 18.0 79 Evening Star 9200 36.0 25.4 142 49.5 31.8 156 Fisher Creek 9100 45.6 34.3 133 52.7 36.6 144 Northeast Entrance 7350 .0 .9 0* 23.2 14.6 159 Parker Peak 9400 39.4 22.0 179 40.1 21.2 189 Sylvan Lake 8420 24.8 18.1 137 42.1 26.3 160 Thumb Divide 7980 12.1 8.4 144 30.6 21.8 140 Two Ocean Plateau 9240 -M 29.6 * -M 31.2 * White Mill 8700 38.1 24.7 154 40.0 27.5 145 Wolverine 7650 .5 .0 * 23.8 14.6 163 ----- ----- Basin Index (%) 143 146 WIND RIVER Burroughs Creek 8750 14.2 -M * 29.4 -M * Castle Creek 8400 .4 -M * 17.7 -M * Cold Springs 9630 11.1 1.5 740 22.5 13.3 169 Deer Park 9700 34.1 14.4 237 43.6 24.6 177 Hobbs Park 10100 33.4 15.9 210 34.7 17.8 195 Kirwin 9550 22.3 10.9 205 29.3 14.8 198 Little Warm 9370 16.0 6.6 242 27.4 16.2 169 Owl Creek 8975 2.2 .5 440* 15.6 8.6 181 South Pass 9040 31.0 11.8 263 33.8 21.3 159 St. Lawrence Alt 8620 3.6 1.0 360 20.8 12.4 168 Togwotee Pass 9580 35.0 25.4 138 43.3 28.5 152 Townsend Creek 8700 16.4 3.9 421 28.3 15.8 179 ----- ----- Basin Index (%) 223 173 BIGHORN BASIN Bald Mtn. 9380 22.5 20.6 109 21.6 21.1 102 Bear Trap Meadow 8200 1.2 .0 * 14.9 11.6 128 Bone Springs Div 9350 21.4 16.6 129 22.0 19.7 112 Grave Springs 8550 8.4 7.7 109 13.7 14.1 97 Kirwin 9550 22.3 10.9 205 29.3 14.8 198 Marquette 8760 17.2 -M * 23.9 -M * Middle Powder 7760 9.4 10.8 87 14.4 15.4 94 Owl Creek 8975 2.2 .5 440* 15.6 8.6 181 Powder River Pass 9480 8.0 9.0 89 18.2 16.3 112 Shell Creek 9580 17.8 16.8 106 18.7 17.6 106 Timber Creek 7950 2.6 1.5 173 15.1 11.0 137 ----- ----- Basin Index (%) 123 122 SHOSHONE RIVER Blackwater 9780 40.6 24.8 164 46.6 24.6 189 Evening Star 9200 36.0 25.4 142 49.5 31.8 156 Marquette 8760 17.2 -M * 23.9 -M * Sylvan Road 7120 .0 1.5 0 32.5 19.3 168 Younts Peak 8350 14.0 15.4 91 33.8 18.5 183 ----- ----- Basin Index (%) 135 172 POWDER RIVER Bear Trap Meadow 8200 1.2 .0 * 14.9 11.6 128 Cloud Peak Reservoir 9860 19.6 16.8 117 26.5 18.2 146 Grave Springs 8550 8.4 7.7 109 13.7 14.1 97 Hansen Sawmill 8360 11.9 1.2 992 20.0 11.9 168 Middle Powder 7760 9.4 10.8 87 14.4 15.4 94 Powder River Pass 9480 8.0 9.0 89 18.2 16.3 112 Soldier Park 8720 14.2 -M * 20.6 -M * ----- ----- Basin Index (%) 129 123 TONGUE RIVER Big Goose 7990 12.4 10.4 119 20.2 15.7 129 Bone Springs Div 9350 21.4 16.6 129 22.0 19.7 112 Burgess Junction 7880 10.9 11.4 96 16.0 16.1 99 Dome Lake 8880 17.2 11.2 154 22.0 17.9 123 Little Goose 8870 15.8 -M * 24.2 -M * Sucker Creek 8880 13.5 12.6 107 19.1 19.0 101 Tie Creek 6870 .0 1.5 0 19.9 15.9 125 ----- ----- Basin Index (%) 118 114 BELLE FOURCHE Cole Canyon 5910 .0 .0 * 12.3 13.5 91 ----- ----- Basin Index (%) * 91 CHEYENNE RIVER BASIN Blind Park 6890 .0 .0 * 12.1 15.5 78 North Rapid Creek 6130 .0 .0 * 10.3 13.4 77 ----- ----- Basin Index (%) * 78 UPPER N. PLATTE Arapaho Ridge 10960 24.2 22.4 108 30.2 27.5 110 Blackhall Mtn 9820 34.8 -M * 42.2 -M * Columbine 9160 6.5 12.7 51 32.1 29.6 108 Divide Peak 8880 6.3 14.3 44 26.2 25.5 103 Joe Wright 10120 16.8 23.2 72 33.5 31.4 107 Laprele Creek 8375 .3 2.8 11 15.7 16.1 98 Med Bow 10500 37.6 -M * 41.3 -M * North French Creek 10130 25.6 32.7 78 34.1 32.4 105 Never Summer 10280 23.6 22.2 106 22.8 -M * Old Battle 10000 37.9 36.8 103 43.4 40.8 106 Rawah 9020 .4 2.7 15 20.7 18.2 114 Sage Creek Basin 7850 -M .0 * 18.3 16.9 108 Sand Lake 10050 32.3 31.8 102 32.2 30.5 106 South Brush Creek 8440 .5 5.2 10 16.8 19.1 88 Tower 10500 43.2 51.4 84 51.3 46.4 111 Webber Springs 9250 18.0 19.4 93 37.4 31.1 120 Willow Creek Pass 9540 16.3 13.4 122 20.6 16.5 125 Zirkel 9340 18.6 19.7 94 47.1 32.4 145 ----- ----- Basin Index (%) 87 111 SWEETWATER Deer Park 9700 34.1 14.4 237 43.6 24.6 177 Larsen Creek 9000 5.3 6.5 82 26.2 -M * South Pass 9040 31.0 11.8 263 33.8 21.3 159 ----- ----- Basin Index (%) 215 169 LOWER N. PLATTE Casper Mtn. 7900 8.0 11.4 70 19.4 19.4 100 Laprele Creek 8375 .3 2.8 11 15.7 16.1 98 Reno Hill 8400 8.1 10.5 77 19.6 20.1 98 Windy Peak 7900 .0 .8 0 15.1 13.9 109 ----- ----- Basin Index (%) 64 100 LARAMIE RIVER Brooklyn Lake 10240 18.0 21.4 84 26.9 26.0 103 Cinnabar Park 9574 11.1 17.4 64 27.0 28.2 96 Crow Creek 8330 .0 .0 * 12.5 14.3 87 Deadman Hill 10220 19.3 18.5 104 24.9 21.7 115 Rawah 9020 .4 2.7 15 20.7 18.2 114 Roach 9700 13.3 15.9 84 25.4 23.3 109 ----- ----- Basin Index (%) 82 104 S. PLATTE Black Mountain 8920 1.7 -M * 16.5 -M * Crow Creek 8330 .0 .0 * 12.5 14.3 87 Deadman Hill 10220 19.3 18.5 104 24.9 21.7 115 ----- ----- Basin Index (%) 104* 104 LITTLE SNAKE RIVER Battle Mountain 7440 .0 .0 * 19.5 18.0 108 Divide Peak 8880 6.3 14.3 44 26.2 25.5 103 Elk River 8700 .1 7.8 1 23.2 23.7 98 Little Snake River 8915 18.9 20.4 93 43.7 34.4 127 Old Battle 10000 37.9 36.8 103 43.4 40.8 106 Sage Creek Basin 7850 -M .0 * 18.3 16.9 108 Sandstone RS 8150 -M 1.9 * 19.5 21.8 89 Whiskey Park 8950 23.1 26.8 86 35.3 32.9 107 ----- ----- Basin Index (%) 81 107 UPPER GREEN RIVER Big Sandy Opening 9080 17.6 8.6 205 25.9 16.1 161 Blind Bull Sum 8650 -M 22.4 * 39.2 22.2 177 East Rim Divide 7930 .4 5.9 7 23.1 13.5 171 Elkhart Park G.S. 9400 16.8 9.6 175 26.8 15.9 169 Gros Ventre Summit 8750 17.7 9.6 184 26.7 15.4 173 Gunsight Pass 9820 23.5 12.1 194 28.6 16.9 169 Kendall R.S. 7740 7.8 .0 * 31.3 16.2 193 Loomis Park 8240 18.5 7.3 253 35.2 19.7 179 New Fork Lake 8340 5.9 2.6 227 20.3 12.8 159 Pocket Creek 9360 -M -M * -M -M * Snider Basin 8060 5.6 7.4 76 29.2 16.2 180 Spring Creek Divide 9000 43.3 23.7 183 44.9 27.1 166 Triple Peak 8500 30.6 14.9 205 44.9 29.1 154 ----- ----- Basin Index (%) 185 170 LOWER GREEN RIVER Blacks Fork Jct 8869 .2 -M * 19.1 -M * Buck Pasture 9632 11.5 -M * 27.6 -M * EF Blacks Fork GS 9360 6.2 -M * 22.6 -M * Hams Fork 7840 .4 .1 400* 23.9 13.8 173 Hewinta 9500 .0 2.0 0 21.1 17.1 123 Hickerson Park 9122 .2 .1 200* 15.0 12.8 117 Hole-in-Rock 9168 .0 .0 * 15.8 12.3 128 Indian Creek 9425 39.2 21.0 187 45.2 26.0 174 Kelley R.S. 8180 14.0 8.4 167 33.9 21.0 161 Spirit Lk 10235 10.2 -M * 21.0 -M * Steel Creek Park 10158 19.6 17.7 111 25.5 20.1 127 ----- ----- Basin Index (%) 149* 147 UPPER BEAR RIVER Bear River RS 8777 .0 -M * 21.5 -M * Bug Lake 7987 26.1 12.2 214 37.7 22.6 167 Burts Miller Ranch 8000 .0 -M * 11.9 -M * Chalk Creek #1 9171 30.7 21.5 143 41.1 29.7 138 Hayden Fork 9130 6.1 5.9 103 33.0 24.8 133 Kelley R.S. 8180 14.0 8.4 167 33.9 21.0 161 Lily Lake 9133 5.9 5.4 109 23.1 20.5 113 Monte Cristo 8932 34.4 21.5 160 44.7 30.6 146 Salt River Summit 7760 10.1 4.5 224 32.0 19.1 168 ----- ----- Basin Index (%) 160 146 ----------------------------------------------------------------------------- -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. ---------------------------------------------------------------------------- -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.