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 MONDAY: MAY 8 , 2017 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7030 15.1 5.5 275 42.2 23.5 180 Black Bear 8170 49.6 36.9 134 59.9 42.8 140 Blind Bull Sum 8650 -M 22.6 * 39.0 22.0 177 Cottonwood Creek 7670 25.5 13.3 192 44.0 28.6 154 East Rim Divide 7930 3.1 6.6 47 22.6 13.4 169 Grand Targhee 9260 57.7 46.4 124 51.4 35.9 143 Granite Creek 6770 15.9 6.3 252 38.4 21.9 175 Grassy Lake 7265 33.9 26.7 127 61.5 40.3 153 Gros Ventre Summit 8750 18.6 10.0 186 26.5 15.2 174 Gunsight Pass 9820 24.0 11.8 203 28.2 16.7 169 Lewis Lake Divide 7850 43.2 29.5 146 59.8 39.5 151 Phillips Bench 8200 38.6 23.4 165 50.7 31.6 160 Salt River Summit 7760 12.1 5.7 212 31.8 18.9 168 Snake River Station 6920 7.1 3.5 203 39.3 25.4 155 Spring Creek Divide 9000 44.6 24.0 186 44.5 26.9 165 Thumb Divide 7980 14.2 9.4 151 30.5 21.6 141 Togwotee Pass 9580 35.9 25.2 142 43.2 28.3 153 Two Ocean Plateau 9240 -M 29.7 * -M 30.9 * Willow Creek 8380 24.7 21.5 115 57.6 38.9 148 Younts Peak 8350 16.7 15.6 107 33.6 18.3 184 ----- ----- Basin Index (%) 150 158 MADISON-GALLATIN Black Bear 8170 49.6 36.9 134 59.9 42.8 140 Canyon 7870 14.6 8.0 182 28.8 18.6 155 Madison Plateau 7750 25.4 20.6 123 40.0 29.8 134 West Yellowstone 6700 .0 .0 * 26.0 16.5 158 Whiskey Creek 6800 9.2 11.5 80 29.9 22.9 131 ----- ----- Basin Index (%) 128 141 YELLOWSTONE Beartooth Lake 9360 35.2 23.0 153 31.8 22.8 139 Burnt Mtn 5880 .0 .0 * 18.6 16.9 110 Canyon 7870 14.6 8.0 182 28.8 18.6 155 Cole Creek 7850 15.2 17.0 89 14.2 17.5 81 Evening Star 9200 36.4 25.2 144 49.4 31.5 157 Fisher Creek 9100 46.3 33.8 137 52.6 36.3 145 Northeast Entrance 7350 .0 1.0 0 23.1 14.4 160 Parker Peak 9400 40.7 21.7 188 40.1 20.9 192 Sylvan Lake 8420 26.5 18.2 146 42.1 26.0 162 Thumb Divide 7980 14.2 9.4 151 30.5 21.6 141 Two Ocean Plateau 9240 -M 29.7 * -M 30.9 * White Mill 8700 39.8 24.5 162 40.0 27.2 147 Wolverine 7650 -M .4 * 23.8 14.3 166 ----- ----- Basin Index (%) 148 147 WIND RIVER Burroughs Creek 8750 15.1 -M * 29.3 -M * Castle Creek 8400 1.9 -M * 17.3 -M * Cold Springs 9630 12.0 1.6 750 22.4 13.2 170 Deer Park 9700 34.9 14.6 239 43.4 24.3 179 Hobbs Park 10100 34.1 15.9 214 34.5 17.6 196 Kirwin 9550 23.1 10.8 214 29.3 14.6 201 Little Warm 9370 16.6 6.9 241 27.2 16.1 169 Owl Creek 8975 3.0 .5 600* 15.3 8.4 182 South Pass 9040 32.1 12.6 255 33.8 21.1 160 St. Lawrence Alt 8620 5.0 1.4 357 20.6 12.2 169 Togwotee Pass 9580 35.9 25.2 142 43.2 28.3 153 Townsend Creek 8700 17.2 4.8 358 28.2 15.6 181 ----- ----- Basin Index (%) 227 174 BIGHORN BASIN Bald Mtn. 9380 22.7 20.4 111 21.5 20.7 104 Bear Trap Meadow 8200 2.6 .2 1300* 14.9 11.4 131 Bone Springs Div 9350 21.9 16.4 134 21.8 19.3 113 Grave Springs 8550 9.5 8.2 116 13.7 13.7 100 Kirwin 9550 23.1 10.8 214 29.3 14.6 201 Marquette 8760 17.9 -M * 23.8 -M * Middle Powder 7760 10.9 11.1 98 14.3 15.0 95 Owl Creek 8975 3.0 .5 600* 15.3 8.4 182 Powder River Pass 9480 8.8 9.0 98 18.1 16.0 113 Shell Creek 9580 17.9 16.6 108 18.5 17.3 107 Timber Creek 7950 3.5 1.8 194 15.0 10.7 140 ----- ----- Basin Index (%) 130 124 SHOSHONE RIVER Blackwater 9780 41.1 25.2 163 46.5 24.3 191 Evening Star 9200 36.4 25.2 144 49.4 31.5 157 Marquette 8760 17.9 -M * 23.8 -M * Sylvan Road 7120 .0 2.4 0 32.3 19.2 168 Younts Peak 8350 16.7 15.6 107 33.6 18.3 184 ----- ----- Basin Index (%) 138 173 POWDER RIVER Bear Trap Meadow 8200 2.6 .2 1300* 14.9 11.4 131 Cloud Peak Reservoir 9860 20.0 16.6 120 26.5 17.8 149 Grave Springs 8550 9.5 8.2 116 13.7 13.7 100 Hansen Sawmill 8360 12.4 1.5 827 18.9 11.6 163 Middle Powder 7760 10.9 11.1 98 14.3 15.0 95 Powder River Pass 9480 8.8 9.0 98 18.1 16.0 113 Soldier Park 8720 14.6 -M * 20.5 -M * ----- ----- Basin Index (%) 138 124 TONGUE RIVER Big Goose 7990 12.8 10.3 124 20.1 15.4 131 Bone Springs Div 9350 21.9 16.4 134 21.8 19.3 113 Burgess Junction 7880 11.4 11.4 100 16.0 15.7 102 Dome Lake 8880 17.9 11.2 160 22.0 17.5 126 Little Goose 8870 16.1 -M * 24.1 -M * Sucker Creek 8880 13.7 12.3 111 19.1 18.6 103 Tie Creek 6870 .5 1.8 28 19.9 15.5 128 ----- ----- Basin Index (%) 123 117 BELLE FOURCHE Cole Canyon 5910 .0 .0 * 12.2 13.2 92 ----- ----- Basin Index (%) * 92 CHEYENNE RIVER BASIN Blind Park 6890 .1 .0 * 11.6 15.1 77 North Rapid Creek 6130 .0 .0 * 10.0 13.0 77 ----- ----- Basin Index (%) * 77 UPPER N. PLATTE Arapaho Ridge 10960 25.0 22.3 112 30.0 27.0 111 Blackhall Mtn 9820 35.4 -M * 42.0 -M * Columbine 9160 8.6 14.4 60 32.1 29.3 110 Divide Peak 8880 8.1 15.6 52 26.1 25.2 104 Joe Wright 10120 17.6 22.9 77 33.5 30.9 108 Laprele Creek 8375 1.0 4.0 25 15.5 15.8 98 Med Bow 10500 38.2 -M * 41.2 -M * North French Creek 10130 26.7 32.8 81 34.1 31.9 107 Never Summer 10280 24.3 22.1 110 22.7 -M * Old Battle 10000 38.6 36.2 107 43.3 40.4 107 Rawah 9020 2.0 3.4 59 20.7 17.9 116 Sage Creek Basin 7850 -M .0 * 18.0 16.7 108 Sand Lake 10050 32.9 31.8 103 32.3 30.1 107 South Brush Creek 8440 .5 6.2 8 16.5 18.7 88 Tower 10500 43.9 51.4 85 51.0 46.1 111 Webber Springs 9250 19.7 20.2 98 37.1 30.8 120 Willow Creek Pass 9540 17.6 14.0 126 20.5 16.3 126 Zirkel 9340 20.6 20.1 102 46.8 32.0 146 ----- ----- Basin Index (%) 90 112 SWEETWATER Deer Park 9700 34.9 14.6 239 43.4 24.3 179 Larsen Creek 9000 7.4 7.1 104 26.1 -M * South Pass 9040 32.1 12.6 255 33.8 21.1 160 ----- ----- Basin Index (%) 217 170 LOWER N. PLATTE Casper Mtn. 7900 10.1 11.9 85 18.9 19.0 99 Laprele Creek 8375 1.0 4.0 25 15.5 15.8 98 Reno Hill 8400 10.0 11.4 88 19.0 19.9 95 Windy Peak 7900 .2 1.6 12 14.0 13.6 103 ----- ----- Basin Index (%) 74 99 LARAMIE RIVER Brooklyn Lake 10240 19.4 21.9 89 26.8 25.7 104 Cinnabar Park 9574 12.6 18.0 70 26.8 28.0 96 Crow Creek 8330 .0 .0 * 12.4 14.1 88 Deadman Hill 10220 20.8 18.7 111 24.9 21.5 116 Rawah 9020 2.0 3.4 59 20.7 17.9 116 Roach 9700 14.6 16.4 89 25.3 23.1 110 ----- ----- Basin Index (%) 89 105 S. PLATTE Black Mountain 8920 3.9 -M * 16.4 -M * Crow Creek 8330 .0 .0 * 12.4 14.1 88 Deadman Hill 10220 20.8 18.7 111 24.9 21.5 116 ----- ----- Basin Index (%) 111* 105 LITTLE SNAKE RIVER Battle Mountain 7440 .0 .0 * 19.5 17.7 110 Divide Peak 8880 8.1 15.6 52 26.1 25.2 104 Elk River 8700 .3 9.3 3 23.2 23.5 99 Little Snake River 8915 20.5 20.9 98 43.6 34.0 128 Old Battle 10000 38.6 36.2 107 43.3 40.4 107 Sage Creek Basin 7850 -M .0 * 18.0 16.7 108 Sandstone RS 8150 -M 2.7 * 19.5 21.5 91 Whiskey Park 8950 23.1 27.0 86 35.2 32.6 108 ----- ----- Basin Index (%) 83 108 UPPER GREEN RIVER Big Sandy Opening 9080 19.3 8.7 222 25.7 15.9 162 Blind Bull Sum 8650 -M 22.6 * 39.0 22.0 177 East Rim Divide 7930 3.1 6.6 47 22.6 13.4 169 Elkhart Park G.S. 9400 17.8 9.8 182 26.3 15.7 168 Gros Ventre Summit 8750 18.6 10.0 186 26.5 15.2 174 Gunsight Pass 9820 24.0 11.8 203 28.2 16.7 169 Kendall R.S. 7740 9.4 .2 4700* 30.6 16.0 191 Loomis Park 8240 19.6 8.0 245 34.6 19.6 177 New Fork Lake 8340 7.3 3.5 209 20.1 12.7 158 Pocket Creek 9360 -M -M * -M -M * Snider Basin 8060 8.2 7.6 108 29.3 16.1 182 Spring Creek Divide 9000 44.6 24.0 186 44.5 26.9 165 Triple Peak 8500 32.7 15.3 214 44.9 28.9 155 ----- ----- Basin Index (%) 194 170 LOWER GREEN RIVER Blacks Fork Jct 8869 .3 -M * 18.8 -M * Buck Pasture 9632 12.7 -M * 27.3 -M * EF Blacks Fork GS 9360 7.5 -M * 21.6 -M * Hams Fork 7840 3.1 .3 1033* 23.9 13.6 176 Hewinta 9500 1.9 2.9 66 21.0 16.9 124 Hickerson Park 9122 .0 1.2 0 14.9 12.6 118 Hole-in-Rock 9168 .0 .7 0* 15.8 12.1 131 Indian Creek 9425 40.5 21.1 192 45.1 25.8 175 Kelley R.S. 8180 16.2 8.9 182 33.7 20.8 162 Spirit Lk 10235 11.7 -M * 21.0 -M * Steel Creek Park 10158 20.3 17.7 115 25.3 19.9 127 ----- ----- Basin Index (%) 155* 148 UPPER BEAR RIVER Bear River RS 8777 .0 -M * 21.4 -M * Bug Lake 7987 28.4 12.6 225 37.6 22.4 168 Burts Miller Ranch 8000 .0 -M * 12.0 -M * Chalk Creek #1 9171 31.8 22.2 143 41.1 29.4 140 Hayden Fork 9130 8.1 6.6 123 33.5 24.6 136 Kelley R.S. 8180 16.2 8.9 182 33.7 20.8 162 Lily Lake 9133 7.5 7.0 107 23.0 20.3 113 Monte Cristo 8932 36.1 22.7 159 44.7 30.3 148 Salt River Summit 7760 12.1 5.7 212 31.8 18.9 168 ----- ----- Basin Index (%) 164 147 ----------------------------------------------------------------------------- -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.