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 SUNDAY: MAY 21 , 2017 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7030 7.6 .0 * 43.2 24.6 176 Black Bear 8170 45.4 33.2 137 61.7 44.7 138 Blind Bull Sum 8650 -M 19.4 * 39.6 23.3 170 Cottonwood Creek 7670 18.4 5.4 341 45.0 30.0 150 East Rim Divide 7930 .0 .0 * 23.5 14.2 165 Grand Targhee 9260 55.3 41.8 132 52.9 36.8 144 Granite Creek 6770 6.2 .0 * 38.7 23.0 168 Grassy Lake 7265 25.1 16.4 153 62.5 41.9 149 Gros Ventre Summit 8750 -M 4.9 * -M 16.2 * Gunsight Pass 9820 20.5 9.9 207 29.6 17.7 167 Lewis Lake Divide 7850 34.9 21.7 161 60.1 41.1 146 Phillips Bench 8200 31.8 18.4 173 51.3 33.0 155 Salt River Summit 7760 3.3 .0 * 32.7 20.0 164 Snake River Station 6920 .0 .0 * 39.6 26.6 149 Spring Creek Divide 9000 37.9 19.7 192 45.8 28.1 163 Thumb Divide 7980 3.9 .8 488* 31.2 22.8 137 Togwotee Pass 9580 33.0 22.9 144 44.5 29.8 149 Two Ocean Plateau 9240 -M 28.2 * -M 33.0 * Willow Creek 8380 -M 15.8 * 59.4 41.0 145 Younts Peak 8350 1.4 11.5 12 33.6 19.6 171 ----- ----- Basin Index (%) 161 153 MADISON-GALLATIN Black Bear 8170 45.4 33.2 137 61.7 44.7 138 Canyon 7870 8.4 1.6 525 29.7 19.9 149 Madison Plateau 7750 19.1 13.8 138 41.4 31.6 131 West Yellowstone 6700 .1 .0 * 26.8 17.6 152 Whiskey Creek 6800 4.1 5.0 82 30.5 24.4 125 ----- ----- Basin Index (%) 144 138 YELLOWSTONE Beartooth Lake 9360 33.8 21.4 158 32.8 24.2 136 Burnt Mtn 5880 2.2 .0 * 23.3 19.2 121 Canyon 7870 8.4 1.6 525 29.7 19.9 149 Cole Creek 7850 16.1 15.8 102 19.3 19.6 98 Evening Star 9200 35.4 23.4 151 50.9 33.4 152 Fisher Creek 9100 48.9 32.5 150 53.4 38.5 139 Northeast Entrance 7350 .0 .0 * 23.8 15.6 153 Parker Peak 9400 35.3 19.6 180 41.5 22.5 184 Sylvan Lake 8420 16.5 14.7 112 43.5 27.7 157 Thumb Divide 7980 3.9 .8 488* 31.2 22.8 137 Two Ocean Plateau 9240 -M 28.2 * -M 33.0 * White Mill 8700 32.9 21.9 150 40.7 29.0 140 Wolverine 7650 -M .0 * 24.8 15.6 159 ----- ----- Basin Index (%) 154 144 WIND RIVER Burroughs Creek 8750 8.5 -M * 29.7 -M * Castle Creek 8400 .0 -M * 18.5 -M * Cold Springs 9630 6.7 .0 * 24.4 14.4 169 Deer Park 9700 31.5 10.0 315 46.0 26.0 177 Hobbs Park 10100 31.7 12.7 250 36.9 19.4 190 Kirwin 9550 19.8 8.0 248 30.6 15.9 192 Little Warm 9370 11.8 2.1 562 28.1 17.4 161 Owl Creek 8975 .8 .0 * 16.9 9.7 174 South Pass 9040 29.7 5.8 512 35.9 22.5 160 St. Lawrence Alt 8620 1.5 .0 * 22.4 13.5 166 Togwotee Pass 9580 33.0 22.9 144 44.5 29.8 149 Townsend Creek 8700 13.3 .0 * 30.6 17.2 178 ----- ----- Basin Index (%) 292 170 BIGHORN BASIN Bald Mtn. 9380 20.7 18.8 110 22.9 22.1 104 Bear Trap Meadow 8200 .1 .0 * 16.7 12.6 133 Bone Springs Div 9350 18.0 14.0 129 23.0 20.9 110 Grave Springs 8550 4.9 1.9 258 15.2 15.1 101 Kirwin 9550 19.8 8.0 248 30.6 15.9 192 Marquette 8760 16.1 -M * 26.2 -M * Middle Powder 7760 4.0 4.4 91 15.2 16.3 93 Owl Creek 8975 .8 .0 * 16.9 9.7 174 Powder River Pass 9480 3.6 4.7 77 18.9 17.3 109 Shell Creek 9580 14.2 14.9 95 19.3 18.5 104 Timber Creek 7950 2.2 .0 * 17.8 12.2 146 ----- ----- Basin Index (%) 132 122 SHOSHONE RIVER Blackwater 9780 40.0 24.0 167 48.2 26.1 185 Evening Star 9200 35.4 23.4 151 50.9 33.4 152 Marquette 8760 16.1 -M * 26.2 -M * Sylvan Road 7120 .0 .0 * 33.3 20.3 164 Younts Peak 8350 1.4 11.5 12 33.6 19.6 171 ----- ----- Basin Index (%) 130 167 POWDER RIVER Bear Trap Meadow 8200 .1 .0 * 16.7 12.6 133 Cloud Peak Reservoir 9860 18.0 14.3 126 28.1 19.7 143 Grave Springs 8550 4.9 1.9 258 15.2 15.1 101 Hansen Sawmill 8360 6.9 .0 * 18.8 13.0 145 Middle Powder 7760 4.0 4.4 91 15.2 16.3 93 Powder River Pass 9480 3.6 4.7 77 18.9 17.3 109 Soldier Park 8720 8.3 -M * 22.3 -M * ----- ----- Basin Index (%) 148 120 TONGUE RIVER Big Goose 7990 8.4 3.8 221 21.1 17.2 123 Bone Springs Div 9350 18.0 14.0 129 23.0 20.9 110 Burgess Junction 7880 6.4 7.6 84 17.0 17.0 100 Dome Lake 8880 13.9 5.4 257 24.3 19.1 127 Little Goose 8870 11.5 -M * 25.4 -M * Sucker Creek 8880 10.5 8.1 130 20.9 20.3 103 Tie Creek 6870 2.2 .0 * 24.2 17.3 140 ----- ----- Basin Index (%) 153 117 BELLE FOURCHE Cole Canyon 5910 .0 .0 * 13.3 14.9 89 ----- ----- Basin Index (%) * 89 CHEYENNE RIVER BASIN Blind Park 6890 .0 .0 * 13.8 16.7 83 North Rapid Creek 6130 .0 .0 * 12.1 14.6 83 ----- ----- Basin Index (%) * 83 UPPER N. PLATTE Arapaho Ridge 10960 21.2 17.3 123 31.9 28.5 112 Blackhall Mtn 9820 28.8 -M * 43.6 -M * Columbine 9160 .9 1.7 53* 34.1 30.7 111 Divide Peak 8880 .8 4.7 17 27.4 26.5 103 Joe Wright 10120 15.0 20.7 72 36.1 33.0 109 Laprele Creek 8375 .8 .0 * 17.0 17.0 100 Med Bow 10500 35.7 -M * 42.4 -M * North French Creek 10130 21.8 28.9 75 35.4 33.8 105 Never Summer 10280 21.3 19.7 108 24.3 -M * Old Battle 10000 37.0 32.2 115 44.7 42.2 106 Rawah 9020 .4 .4 100* 21.5 18.9 114 Sage Creek Basin 7850 -M .0 * 18.9 17.4 109 Sand Lake 10050 30.7 27.4 112 34.0 32.0 106 South Brush Creek 8440 .0 .0 * 16.1 20.2 80 Tower 10500 40.4 47.3 85 54.4 47.9 114 Webber Springs 9250 11.8 10.9 108 38.7 32.1 121 Willow Creek Pass 9540 12.3 8.8 140 22.0 17.4 126 Zirkel 9340 11.0 8.1 136 49.1 33.4 147 ----- ----- Basin Index (%) 99 112 SWEETWATER Deer Park 9700 31.5 10.0 315 46.0 26.0 177 Larsen Creek 9000 .8 3.3 24 27.4 -M * South Pass 9040 29.7 5.8 512 35.9 22.5 160 ----- ----- Basin Index (%) 325 169 LOWER N. PLATTE Casper Mtn. 7900 2.0 3.6 56 20.9 20.5 102 Laprele Creek 8375 .8 .0 * 17.0 17.0 100 Reno Hill 8400 2.1 2.6 81 21.1 21.5 98 Windy Peak 7900 1.6 .0 * 17.7 14.9 119 ----- ----- Basin Index (%) 105 104 LARAMIE RIVER Brooklyn Lake 10240 12.8 15.5 83 28.6 27.3 105 Cinnabar Park 9574 6.5 11.5 57 28.9 29.6 98 Crow Creek 8330 -M .0 * 15.5 15.2 102 Deadman Hill 10220 16.4 16.0 102 28.2 23.1 122 Rawah 9020 .4 .4 100* 21.5 18.9 114 Roach 9700 9.2 10.8 85 27.7 24.7 112 ----- ----- Basin Index (%) 84 108 S. PLATTE Black Mountain 8920 2.4 -M * 20.1 -M * Crow Creek 8330 -M .0 * 15.5 15.2 102 Deadman Hill 10220 16.4 16.0 102 28.2 23.1 122 ----- ----- Basin Index (%) 102* 114 LITTLE SNAKE RIVER Battle Mountain 7440 .0 .0 * 20.5 18.6 110 Divide Peak 8880 .8 4.7 17 27.4 26.5 103 Elk River 8700 .4 .0 * 24.4 24.6 99 Little Snake River 8915 12.1 12.2 99 44.8 35.2 127 Old Battle 10000 37.0 32.2 115 44.7 42.2 106 Sage Creek Basin 7850 -M .0 * 18.9 17.4 109 Sandstone RS 8150 .0 .0 * 19.4 22.5 86 Whiskey Park 8950 17.9 20.9 86 36.9 33.9 109 ----- ----- Basin Index (%) 97 107 UPPER GREEN RIVER Big Sandy Opening 9080 13.2 2.2 600 27.0 16.9 160 Blind Bull Sum 8650 -M 19.4 * 39.6 23.3 170 East Rim Divide 7930 .0 .0 * 23.5 14.2 165 Elkhart Park G.S. 9400 12.5 5.2 240 27.7 16.8 165 Gros Ventre Summit 8750 -M 4.9 * -M 16.2 * Gunsight Pass 9820 20.5 9.9 207 29.6 17.7 167 Kendall R.S. 7740 .0 .0 * 31.8 16.8 189 Loomis Park 8240 13.4 1.9 705 35.4 20.6 172 New Fork Lake 8340 -M .0 * 21.6 13.6 159 Pocket Creek 9360 -M -M * -M -M * Snider Basin 8060 -M .0 * 29.6 16.8 176 Spring Creek Divide 9000 37.9 19.7 192 45.8 28.1 163 Triple Peak 8500 23.7 7.4 320 45.5 30.3 150 ----- ----- Basin Index (%) 262* 166 LOWER GREEN RIVER Blacks Fork Jct 8869 .0 -M * 19.6 -M * Buck Pasture 9632 4.6 -M * 28.2 -M * EF Blacks Fork GS 9360 -M -M * 23.6 -M * Hams Fork 7840 .0 .0 * 24.8 14.4 172 Hewinta 9500 .0 .0 * 21.7 17.8 122 Hickerson Park 9122 .2 .0 * 16.0 13.5 119 Hole-in-Rock 9168 .0 .0 * 16.7 13.1 127 Indian Creek 9425 35.8 17.8 201 46.7 27.1 172 Kelley R.S. 8180 7.7 2.1 367 35.3 21.8 162 Spirit Lk 10235 4.3 -M * 22.2 -M * Steel Creek Park 10158 15.9 14.2 112 26.2 21.1 124 ----- ----- Basin Index (%) 175* 145 UPPER BEAR RIVER Bear River RS 8777 .0 -M * 21.9 -M * Bug Lake 7987 20.6 3.8 542 38.8 23.6 164 Burts Miller Ranch 8000 .0 -M * 12.2 -M * Chalk Creek #1 9171 23.7 14.6 162 42.1 30.9 136 Hayden Fork 9130 .1 .0 * 33.0 25.9 127 Kelley R.S. 8180 7.7 2.1 367 35.3 21.8 162 Lily Lake 9133 .0 .0 * 23.5 21.4 110 Monte Cristo 8932 28.1 13.9 202 46.3 31.6 147 Salt River Summit 7760 3.3 .0 * 32.7 20.0 164 ----- ----- Basin Index (%) 243* 144 ----------------------------------------------------------------------------- -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.