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 6 , 2017 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7030 16.9 6.6 256 42.2 23.3 181 Black Bear 8170 50.6 37.1 136 59.8 42.5 141 Blind Bull Sum 8650 48.5 22.7 214 39.1 21.8 179 Cottonwood Creek 7670 27.1 13.7 198 44.0 28.1 157 East Rim Divide 7930 5.2 7.1 73 22.5 13.2 170 Grand Targhee 9260 59.3 46.2 128 51.2 35.5 144 Granite Creek 6770 17.9 7.1 252 38.4 21.7 177 Grassy Lake 7265 37.2 27.3 136 61.5 39.9 154 Gros Ventre Summit 8750 19.7 10.5 188 26.5 15.0 177 Gunsight Pass 9820 25.8 11.7 221 28.3 16.4 173 Lewis Lake Divide 7850 45.9 29.4 156 59.9 39.2 153 Phillips Bench 8200 40.3 23.9 169 50.8 31.3 162 Salt River Summit 7760 14.7 6.7 219 31.9 18.7 171 Snake River Station 6920 9.9 4.6 215 39.2 25.2 156 Spring Creek Divide 9000 44.9 24.1 186 44.6 26.7 167 Thumb Divide 7980 16.5 10.0 165 30.5 21.4 143 Togwotee Pass 9580 36.3 24.9 146 43.1 27.9 154 Two Ocean Plateau 9240 -M 29.8 * -M 30.7 * Willow Creek 8380 27.3 21.8 125 57.6 38.5 150 Younts Peak 8350 19.1 15.7 122 33.6 18.1 186 ----- ----- Basin Index (%) 160 160 MADISON-GALLATIN Black Bear 8170 50.6 37.1 136 59.8 42.5 141 Canyon 7870 16.5 8.5 194 28.9 18.4 157 Madison Plateau 7750 27.8 20.7 134 40.0 29.5 136 West Yellowstone 6700 .0 .0 * 25.9 16.3 159 Whiskey Creek 6800 10.5 12.4 85 29.9 22.7 132 ----- ----- Basin Index (%) 134 143 YELLOWSTONE Beartooth Lake 9360 35.9 22.8 157 31.8 22.4 142 Burnt Mtn 5880 .0 .0 * 18.5 16.4 113 Canyon 7870 16.5 8.5 194 28.9 18.4 157 Cole Creek 7850 16.1 16.9 95 14.2 16.9 84 Evening Star 9200 40.0 25.0 160 49.3 31.1 159 Fisher Creek 9100 47.5 33.2 143 52.7 35.8 147 Northeast Entrance 7350 .0 1.0 0 23.1 14.1 164 Parker Peak 9400 42.6 21.5 198 40.1 20.6 195 Sylvan Lake 8420 25.3 18.5 137 42.0 25.6 164 Thumb Divide 7980 16.5 10.0 165 30.5 21.4 143 Two Ocean Plateau 9240 -M 29.8 * -M 30.7 * White Mill 8700 40.7 24.1 169 40.0 26.8 149 Wolverine 7650 .0 .6 0* 23.8 14.1 169 ----- ----- Basin Index (%) 154 150 WIND RIVER Burroughs Creek 8750 16.9 -M * 29.3 -M * Castle Creek 8400 3.8 -M * 17.3 -M * Cold Springs 9630 13.5 1.5 900 22.4 13.0 172 Deer Park 9700 35.7 14.9 240 43.4 24.1 180 Hobbs Park 10100 34.9 15.9 219 34.6 17.3 200 Kirwin 9550 24.3 10.7 227 29.3 14.4 203 Little Warm 9370 18.0 7.5 240 27.2 15.8 172 Owl Creek 8975 5.3 .6 883 15.3 8.3 184 South Pass 9040 33.0 13.4 246 33.8 20.9 162 St. Lawrence Alt 8620 7.3 1.6 456 20.6 12.0 172 Togwotee Pass 9580 36.3 24.9 146 43.1 27.9 154 Townsend Creek 8700 18.3 5.7 321 28.2 15.4 183 ----- ----- Basin Index (%) 234 176 BIGHORN BASIN Bald Mtn. 9380 22.8 20.4 112 21.5 20.2 106 Bear Trap Meadow 8200 5.1 .2 2550* 14.9 11.1 134 Bone Springs Div 9350 23.4 16.3 144 21.8 18.8 116 Grave Springs 8550 10.8 8.8 123 13.7 13.5 101 Kirwin 9550 24.3 10.7 227 29.3 14.4 203 Marquette 8760 19.6 -M * 23.9 -M * Middle Powder 7760 12.6 11.2 112 14.2 14.7 97 Owl Creek 8975 5.3 .6 883 15.3 8.3 184 Powder River Pass 9480 10.7 9.1 118 18.1 15.6 116 Shell Creek 9580 19.6 16.3 120 18.4 16.8 110 Timber Creek 7950 5.6 2.1 267 15.0 10.6 142 ----- ----- Basin Index (%) 146 127 SHOSHONE RIVER Blackwater 9780 41.8 25.7 163 46.4 24.1 193 Evening Star 9200 40.0 25.0 160 49.3 31.1 159 Marquette 8760 19.6 -M * 23.9 -M * Sylvan Road 7120 .0 3.3 0 32.3 18.9 171 Younts Peak 8350 19.1 15.7 122 33.6 18.1 186 ----- ----- Basin Index (%) 145 175 POWDER RIVER Bear Trap Meadow 8200 5.1 .2 2550* 14.9 11.1 134 Cloud Peak Reservoir 9860 20.9 16.4 127 26.4 17.3 153 Grave Springs 8550 10.8 8.8 123 13.7 13.5 101 Hansen Sawmill 8360 14.1 1.6 881 18.9 11.3 167 Middle Powder 7760 12.6 11.2 112 14.2 14.7 97 Powder River Pass 9480 10.7 9.1 118 18.1 15.6 116 Soldier Park 8720 16.6 -M * 20.5 -M * ----- ----- Basin Index (%) 157 127 TONGUE RIVER Big Goose 7990 14.2 9.9 143 20.1 14.9 135 Bone Springs Div 9350 23.4 16.3 144 21.8 18.8 116 Burgess Junction 7880 12.7 11.6 109 15.9 15.3 104 Dome Lake 8880 19.3 11.3 171 22.0 17.0 129 Little Goose 8870 17.9 -M * 24.0 -M * Sucker Creek 8880 15.1 12.0 126 19.1 18.0 106 Tie Creek 6870 2.7 2.2 123 19.7 15.0 131 ----- ----- Basin Index (%) 138 120 BELLE FOURCHE Cole Canyon 5910 .1 .0 * 12.3 12.7 97 ----- ----- Basin Index (%) * 97 CHEYENNE RIVER BASIN Blind Park 6890 .0 .0 * 11.6 14.9 78 North Rapid Creek 6130 .0 .0 * 10.0 12.8 78 ----- ----- Basin Index (%) * 78 UPPER N. PLATTE Arapaho Ridge 10960 25.6 22.3 115 29.8 26.8 111 Blackhall Mtn 9820 36.5 -M * 42.2 -M * Columbine 9160 10.7 15.8 68 32.2 29.2 110 Divide Peak 8880 10.2 16.8 61 26.1 24.9 105 Joe Wright 10120 18.5 22.8 81 33.4 30.7 109 Laprele Creek 8375 3.8 4.9 78 15.4 15.5 99 Med Bow 10500 39.3 -M * 41.2 -M * North French Creek 10130 27.8 32.8 85 34.0 31.5 108 Never Summer 10280 24.7 22.0 112 22.7 -M * Old Battle 10000 40.0 35.3 113 43.3 40.0 108 Rawah 9020 4.0 4.2 95 20.7 17.7 117 Sage Creek Basin 7850 -M .4 * 17.9 16.6 108 Sand Lake 10050 33.5 31.7 106 32.3 29.7 109 South Brush Creek 8440 .6 7.1 8 16.4 18.4 89 Tower 10500 44.7 51.2 87 51.0 45.7 112 Webber Springs 9250 22.7 20.7 110 37.0 30.5 121 Willow Creek Pass 9540 18.8 14.4 131 20.5 16.1 127 Zirkel 9340 23.5 20.5 115 46.8 31.7 148 ----- ----- Basin Index (%) 96 113 SWEETWATER Deer Park 9700 35.7 14.9 240 43.4 24.1 180 Larsen Creek 9000 9.3 7.7 121 25.9 -M * South Pass 9040 33.0 13.4 246 33.8 20.9 162 ----- ----- Basin Index (%) 217 172 LOWER N. PLATTE Casper Mtn. 7900 12.1 12.0 101 18.8 18.8 100 Laprele Creek 8375 3.8 4.9 78 15.4 15.5 99 Reno Hill 8400 12.3 11.9 103 19.1 19.5 98 Windy Peak 7900 1.7 2.4 71 14.0 13.4 104 ----- ----- Basin Index (%) 96 100 LARAMIE RIVER Brooklyn Lake 10240 20.6 22.5 92 26.8 25.3 106 Cinnabar Park 9574 13.5 18.2 74 26.8 27.7 97 Crow Creek 8330 .0 .0 * 12.4 13.9 89 Deadman Hill 10220 22.1 19.0 116 24.9 21.2 117 Rawah 9020 4.0 4.2 95 20.7 17.7 117 Roach 9700 16.0 16.8 95 25.2 22.8 111 ----- ----- Basin Index (%) 94 106 S. PLATTE Black Mountain 8920 6.3 -M * 16.4 -M * Crow Creek 8330 .0 .0 * 12.4 13.9 89 Deadman Hill 10220 22.1 19.0 116 24.9 21.2 117 ----- ----- Basin Index (%) 116* 106 LITTLE SNAKE RIVER Battle Mountain 7440 .0 .0 * 19.4 17.5 111 Divide Peak 8880 10.2 16.8 61 26.1 24.9 105 Elk River 8700 2.4 10.7 22 23.2 23.3 100 Little Snake River 8915 21.9 21.2 103 43.5 33.5 130 Old Battle 10000 40.0 35.3 113 43.3 40.0 108 Sage Creek Basin 7850 -M .4 * 17.9 16.6 108 Sandstone RS 8150 -M 3.6 * 19.3 21.2 91 Whiskey Park 8950 23.9 27.1 88 35.2 32.2 109 ----- ----- Basin Index (%) 89 109 UPPER GREEN RIVER Big Sandy Opening 9080 20.7 8.8 235 25.7 15.6 165 Blind Bull Sum 8650 48.5 22.7 214 39.1 21.8 179 East Rim Divide 7930 5.2 7.1 73 22.5 13.2 170 Elkhart Park G.S. 9400 19.8 10.1 196 26.3 15.4 171 Gros Ventre Summit 8750 19.7 10.5 188 26.5 15.0 177 Gunsight Pass 9820 25.8 11.7 221 28.3 16.4 173 Kendall R.S. 7740 10.7 1.4 764 30.6 15.8 194 Loomis Park 8240 20.9 8.9 235 34.6 19.3 179 New Fork Lake 8340 9.0 4.5 200 19.8 12.5 158 Pocket Creek 9360 -M -M * -M -M * Snider Basin 8060 11.9 8.0 149 29.2 15.9 184 Spring Creek Divide 9000 44.9 24.1 186 44.6 26.7 167 Triple Peak 8500 35.1 15.7 224 44.9 28.5 158 ----- ----- Basin Index (%) 204 172 LOWER GREEN RIVER Blacks Fork Jct 8869 2.0 -M * 18.8 -M * Buck Pasture 9632 15.0 -M * 27.3 -M * EF Blacks Fork GS 9360 10.4 -M * 21.6 -M * Hams Fork 7840 5.4 .7 771* 23.9 13.4 178 Hewinta 9500 4.9 3.7 132 20.9 16.7 125 Hickerson Park 9122 .2 2.2 9 14.9 12.4 120 Hole-in-Rock 9168 .6 1.3 46 15.7 12.0 131 Indian Creek 9425 42.7 21.5 199 45.1 25.5 177 Kelley R.S. 8180 -M 9.5 * 33.7 20.6 164 Spirit Lk 10235 14.4 -M * 20.8 -M * Steel Creek Park 10158 21.5 17.5 123 25.2 19.7 128 ----- ----- Basin Index (%) 161* 149 UPPER BEAR RIVER Bear River RS 8777 .0 -M * 21.3 -M * Bug Lake 7987 31.6 13.1 241 37.7 22.2 170 Burts Miller Ranch 8000 .0 -M * 11.9 -M * Chalk Creek #1 9171 33.7 22.8 148 41.0 29.2 140 Hayden Fork 9130 11.2 7.6 147 33.2 24.4 136 Kelley R.S. 8180 -M 9.5 * 33.7 20.6 164 Lily Lake 9133 10.2 8.6 119 23.0 20.1 114 Monte Cristo 8932 37.9 24.0 158 44.6 30.0 149 Salt River Summit 7760 14.7 6.7 219 31.9 18.7 171 ----- ----- Basin Index (%) 168 148 ----------------------------------------------------------------------------- -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.