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 TUESDAY: MAY 23 , 2017 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7030 5.9 .0 * 43.2 24.8 174 Black Bear 8170 44.6 32.3 138 61.7 45.0 137 Blind Bull Sum 8650 -M 18.3 * 39.6 23.5 169 Cottonwood Creek 7670 16.3 3.4 479 45.2 30.4 149 East Rim Divide 7930 .1 .0 * 23.5 14.4 163 Grand Targhee 9260 55.5 41.4 134 53.0 37.5 141 Granite Creek 6770 3.7 .0 * 38.6 23.2 166 Grassy Lake 7265 23.1 14.3 162 62.5 42.3 148 Gros Ventre Summit 8750 -M 3.5 * -M 16.4 * Gunsight Pass 9820 20.2 8.7 232 29.6 18.0 164 Lewis Lake Divide 7850 33.6 20.2 166 60.2 41.4 145 Phillips Bench 8200 30.2 16.7 181 51.3 33.3 154 Salt River Summit 7760 1.1 .0 * 32.7 20.2 162 Snake River Station 6920 .0 .0 * 39.6 26.8 148 Spring Creek Divide 9000 38.7 18.3 211 45.9 28.4 162 Thumb Divide 7980 1.9 .3 633* 31.2 23.1 135 Togwotee Pass 9580 32.4 22.7 143 44.5 30.1 148 Two Ocean Plateau 9240 -M 27.9 * -M 33.3 * Willow Creek 8380 -M 13.6 * 59.4 41.3 144 Younts Peak 8350 .0 10.7 0 33.9 19.9 170 ----- ----- Basin Index (%) 163 152 MADISON-GALLATIN Black Bear 8170 44.6 32.3 138 61.7 45.0 137 Canyon 7870 6.7 .6 1117* 29.7 20.2 147 Madison Plateau 7750 18.2 12.9 141 41.4 32.0 129 West Yellowstone 6700 .0 .0 * 26.8 17.8 151 Whiskey Creek 6800 2.5 3.7 68 30.8 24.6 125 ----- ----- Basin Index (%) 145 136 YELLOWSTONE Beartooth Lake 9360 33.9 20.8 163 33.0 24.4 135 Burnt Mtn 5880 .6 .0 * 23.6 19.7 120 Canyon 7870 6.7 .6 1117* 29.7 20.2 147 Cole Creek 7850 15.9 14.7 108 19.3 19.9 97 Evening Star 9200 35.2 22.6 156 50.9 33.7 151 Fisher Creek 9100 47.9 31.9 150 53.6 38.8 138 Northeast Entrance 7350 .0 .0 * 23.8 15.9 150 Parker Peak 9400 34.6 19.2 180 41.4 22.8 182 Sylvan Lake 8420 16.2 13.7 118 43.5 28.1 155 Thumb Divide 7980 1.9 .3 633* 31.2 23.1 135 Two Ocean Plateau 9240 -M 27.9 * -M 33.3 * White Mill 8700 31.7 21.4 148 40.6 29.3 139 Wolverine 7650 .0 .0 * 24.8 15.8 157 ----- ----- Basin Index (%) 155 142 WIND RIVER Burroughs Creek 8750 6.4 -M * 29.6 -M * Castle Creek 8400 .0 -M * 18.7 -M * Cold Springs 9630 6.4 .0 * 24.4 14.6 167 Deer Park 9700 31.8 9.1 349 46.5 26.3 177 Hobbs Park 10100 32.1 11.8 272 37.2 19.6 190 Kirwin 9550 19.3 7.0 276 30.7 16.2 190 Little Warm 9370 11.5 1.0 1150* 28.1 17.7 159 Owl Creek 8975 .0 .0 * 17.1 9.9 173 South Pass 9040 28.9 4.1 705 36.3 22.7 160 St. Lawrence Alt 8620 1.4 .0 * 22.8 13.7 166 Togwotee Pass 9580 32.4 22.7 143 44.5 30.1 148 Townsend Creek 8700 13.4 .0 * 30.7 17.4 176 ----- ----- Basin Index (%) 318* 169 BIGHORN BASIN Bald Mtn. 9380 20.9 18.0 116 23.0 22.4 103 Bear Trap Meadow 8200 .0 .0 * 16.8 12.9 130 Bone Springs Div 9350 18.2 13.4 136 23.2 21.3 109 Grave Springs 8550 4.7 .3 1567* 15.3 15.2 101 Kirwin 9550 19.3 7.0 276 30.7 16.2 190 Marquette 8760 16.0 -M * 26.7 -M * Middle Powder 7760 2.8 2.6 108 15.4 16.5 93 Owl Creek 8975 .0 .0 * 17.1 9.9 173 Powder River Pass 9480 3.4 3.2 106 19.0 17.7 107 Shell Creek 9580 14.3 14.4 99 19.4 18.9 103 Timber Creek 7950 1.9 .0 * 18.3 12.5 146 ----- ----- Basin Index (%) 145 121 SHOSHONE RIVER Blackwater 9780 40.1 23.6 170 48.2 26.3 183 Evening Star 9200 35.2 22.6 156 50.9 33.7 151 Marquette 8760 16.0 -M * 26.7 -M * Sylvan Road 7120 .0 .0 * 33.4 20.6 162 Younts Peak 8350 .0 10.7 0 33.9 19.9 170 ----- ----- Basin Index (%) 132 166 POWDER RIVER Bear Trap Meadow 8200 .0 .0 * 16.8 12.9 130 Cloud Peak Reservoir 9860 18.4 13.2 139 28.3 20.0 142 Grave Springs 8550 4.7 .3 1567* 15.3 15.2 101 Hansen Sawmill 8360 6.4 .0 * 20.1 13.3 151 Middle Powder 7760 2.8 2.6 108 15.4 16.5 93 Powder River Pass 9480 3.4 3.2 106 19.0 17.7 107 Soldier Park 8720 8.0 -M * 22.5 -M * ----- ----- Basin Index (%) 185* 120 TONGUE RIVER Big Goose 7990 8.5 2.1 405 21.4 17.5 122 Bone Springs Div 9350 18.2 13.4 136 23.2 21.3 109 Burgess Junction 7880 6.3 6.2 102 17.4 17.3 101 Dome Lake 8880 14.0 4.0 350 24.5 19.4 126 Little Goose 8870 11.8 -M * 25.8 -M * Sucker Creek 8880 10.8 7.0 154 21.0 20.6 102 Tie Creek 6870 1.2 .0 * 24.6 17.6 140 ----- ----- Basin Index (%) 180 116 BELLE FOURCHE Cole Canyon 5910 .0 .0 * 13.6 15.1 90 ----- ----- Basin Index (%) * 90 CHEYENNE RIVER BASIN Blind Park 6890 .0 .0 * 14.5 17.2 84 North Rapid Creek 6130 .0 .0 * 12.8 14.9 86 ----- ----- Basin Index (%) * 85 UPPER N. PLATTE Arapaho Ridge 10960 21.9 15.5 141 32.7 28.7 114 Blackhall Mtn 9820 29.8 -M * 44.7 -M * Columbine 9160 .5 .1 500* 34.6 30.8 112 Divide Peak 8880 .0 3.0 0 27.7 26.7 104 Joe Wright 10120 15.7 19.7 80 36.8 33.2 111 Laprele Creek 8375 .4 .0 * 17.3 17.1 101 Med Bow 10500 36.7 -M * 43.1 -M * North French Creek 10130 22.4 27.5 81 36.0 34.1 106 Never Summer 10280 22.1 18.8 118 25.1 -M * Old Battle 10000 38.1 31.3 122 45.4 42.4 107 Rawah 9020 .5 .1 500* 22.2 19.1 116 Sage Creek Basin 7850 -M .0 * 19.1 17.5 109 Sand Lake 10050 31.2 26.4 118 34.5 32.2 107 South Brush Creek 8440 .0 .0 * 16.3 20.4 80 Tower 10500 41.2 46.4 89 54.6 48.2 113 Webber Springs 9250 12.2 8.8 139 39.6 32.3 123 Willow Creek Pass 9540 12.7 7.5 169 22.8 17.6 130 Zirkel 9340 10.9 5.0 218 49.6 33.5 148 ----- ----- Basin Index (%) 109 113 SWEETWATER Deer Park 9700 31.8 9.1 349 46.5 26.3 177 Larsen Creek 9000 .2 2.7 7 27.6 -M * South Pass 9040 28.9 4.1 705 36.3 22.7 160 ----- ----- Basin Index (%) 383 169 LOWER N. PLATTE Casper Mtn. 7900 1.7 2.2 77 21.3 20.7 103 Laprele Creek 8375 .4 .0 * 17.3 17.1 101 Reno Hill 8400 2.4 .8 300* 21.5 21.6 100 Windy Peak 7900 1.4 .0 * 17.9 15.1 119 ----- ----- Basin Index (%) 197* 105 LARAMIE RIVER Brooklyn Lake 10240 13.2 13.8 96 28.9 27.5 105 Cinnabar Park 9574 6.5 9.5 68 29.2 29.8 98 Crow Creek 8330 -M .0 * 15.7 15.5 101 Deadman Hill 10220 16.8 14.6 115 28.8 23.3 124 Rawah 9020 .5 .1 500* 22.2 19.1 116 Roach 9700 9.7 9.2 105 28.4 24.9 114 ----- ----- Basin Index (%) 99 109 S. PLATTE Black Mountain 8920 2.4 -M * 20.6 -M * Crow Creek 8330 -M .0 * 15.7 15.5 101 Deadman Hill 10220 16.8 14.6 115 28.8 23.3 124 ----- ----- Basin Index (%) 115* 115 LITTLE SNAKE RIVER Battle Mountain 7440 .0 .0 * 20.4 18.7 109 Divide Peak 8880 .0 3.0 0 27.7 26.7 104 Elk River 8700 .2 .0 * 24.7 24.8 100 Little Snake River 8915 12.1 9.9 122 45.2 35.4 128 Old Battle 10000 38.1 31.3 122 45.4 42.4 107 Sage Creek Basin 7850 -M .0 * 19.1 17.5 109 Sandstone RS 8150 .0 .0 * 19.3 22.7 85 Whiskey Park 8950 16.3 18.8 87 37.3 34.0 110 ----- ----- Basin Index (%) 106 108 UPPER GREEN RIVER Big Sandy Opening 9080 12.4 .4 3100* 27.0 17.1 158 Blind Bull Sum 8650 -M 18.3 * 39.6 23.5 169 East Rim Divide 7930 .1 .0 * 23.5 14.4 163 Elkhart Park G.S. 9400 11.8 4.2 281 27.6 17.1 161 Gros Ventre Summit 8750 -M 3.5 * -M 16.4 * Gunsight Pass 9820 20.2 8.7 232 29.6 18.0 164 Kendall R.S. 7740 .0 .0 * 31.8 17.0 187 Loomis Park 8240 12.3 .5 2460* 35.4 20.8 170 New Fork Lake 8340 -M .0 * 21.9 13.8 159 Pocket Creek 9360 -M -M * -M -M * Snider Basin 8060 -M .0 * 29.8 17.0 175 Spring Creek Divide 9000 38.7 18.3 211 45.9 28.4 162 Triple Peak 8500 22.1 5.5 402 45.6 30.6 149 ----- ----- Basin Index (%) 313* 164 LOWER GREEN RIVER Blacks Fork Jct 8869 .1 -M * 19.7 -M * Buck Pasture 9632 3.9 -M * 28.4 -M * EF Blacks Fork GS 9360 -M -M * 23.9 -M * Hams Fork 7840 .0 .0 * 24.9 14.7 169 Hewinta 9500 .0 .0 * 22.2 17.9 124 Hickerson Park 9122 .1 .0 * 16.3 13.7 119 Hole-in-Rock 9168 .0 .0 * 17.2 13.3 129 Indian Creek 9425 35.2 16.3 216 46.9 27.3 172 Kelley R.S. 8180 6.2 .7 886* 35.4 22.1 160 Spirit Lk 10235 4.1 -M * 22.6 -M * Steel Creek Park 10158 16.2 13.3 122 26.6 21.3 125 ----- ----- Basin Index (%) 190* 145 UPPER BEAR RIVER Bear River RS 8777 .0 -M * 22.2 -M * Bug Lake 7987 19.0 1.2 1583* 38.9 23.8 163 Burts Miller Ranch 8000 .0 -M * 12.4 -M * Chalk Creek #1 9171 22.7 12.8 177 42.4 31.1 136 Hayden Fork 9130 .1 .0 * 33.3 26.1 128 Kelley R.S. 8180 6.2 .7 886* 35.4 22.1 160 Lily Lake 9133 .1 .0 * 24.0 21.6 111 Monte Cristo 8932 27.8 11.9 234 46.3 32.0 145 Salt River Summit 7760 1.1 .0 * 32.7 20.2 162 ----- ----- Basin Index (%) 289* 143 ----------------------------------------------------------------------------- -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.