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 22 , 2017 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7030 6.9 .0 * 43.2 24.7 175 Black Bear 8170 44.9 32.7 137 61.7 44.9 137 Blind Bull Sum 8650 -M 18.8 * 39.6 23.4 169 Cottonwood Creek 7670 17.5 4.4 398 45.1 30.3 149 East Rim Divide 7930 .0 .0 * 23.5 14.3 164 Grand Targhee 9260 56.1 41.6 135 52.9 37.1 143 Granite Creek 6770 5.0 .0 * 38.6 23.1 167 Grassy Lake 7265 23.9 15.4 155 62.5 42.1 148 Gros Ventre Summit 8750 -M 4.2 * -M 16.3 * Gunsight Pass 9820 20.2 9.3 217 29.6 17.8 166 Lewis Lake Divide 7850 34.1 21.0 162 60.1 41.2 146 Phillips Bench 8200 31.3 17.6 178 51.4 33.1 155 Salt River Summit 7760 2.5 .0 * 32.6 20.1 162 Snake River Station 6920 .0 .0 * 39.6 26.7 148 Spring Creek Divide 9000 37.8 19.0 199 45.9 28.3 162 Thumb Divide 7980 2.5 .3 833* 31.2 22.9 136 Togwotee Pass 9580 32.8 22.8 144 44.5 29.9 149 Two Ocean Plateau 9240 -M 28.0 * -M 33.1 * Willow Creek 8380 -M 14.7 * 59.4 41.2 144 Younts Peak 8350 .3 11.1 3 33.6 19.8 170 ----- ----- Basin Index (%) 162 153 MADISON-GALLATIN Black Bear 8170 44.9 32.7 137 61.7 44.9 137 Canyon 7870 7.9 1.1 718* 29.7 20.0 148 Madison Plateau 7750 19.1 13.3 144 41.4 31.8 130 West Yellowstone 6700 .0 .0 * 26.8 17.7 151 Whiskey Creek 6800 3.3 4.3 77 30.7 24.5 125 ----- ----- Basin Index (%) 146 137 YELLOWSTONE Beartooth Lake 9360 33.4 21.1 158 33.0 24.3 136 Burnt Mtn 5880 1.4 .0 * 23.3 19.3 121 Canyon 7870 7.9 1.1 718* 29.7 20.0 148 Cole Creek 7850 16.0 15.2 105 19.3 19.7 98 Evening Star 9200 35.3 23.0 153 50.9 33.6 151 Fisher Creek 9100 47.9 32.2 149 53.5 38.6 139 Northeast Entrance 7350 .0 .0 * 23.8 15.7 152 Parker Peak 9400 35.2 19.4 181 41.4 22.6 183 Sylvan Lake 8420 16.1 14.2 113 43.5 27.9 156 Thumb Divide 7980 2.5 .3 833* 31.2 22.9 136 Two Ocean Plateau 9240 -M 28.0 * -M 33.1 * White Mill 8700 32.2 21.6 149 40.6 29.2 139 Wolverine 7650 -M .0 * 24.7 15.7 157 ----- ----- Basin Index (%) 154 143 WIND RIVER Burroughs Creek 8750 7.7 -M * 29.6 -M * Castle Creek 8400 .0 -M * 18.7 -M * Cold Springs 9630 6.6 .0 * 24.4 14.5 168 Deer Park 9700 31.6 9.5 333 46.2 26.1 177 Hobbs Park 10100 31.8 12.2 261 36.9 19.5 189 Kirwin 9550 19.3 7.5 257 30.6 16.1 190 Little Warm 9370 11.7 1.5 780 28.1 17.5 161 Owl Creek 8975 .2 .0 * 17.0 9.8 173 South Pass 9040 29.3 4.9 598 36.0 22.6 159 St. Lawrence Alt 8620 1.3 .0 * 22.5 13.6 165 Togwotee Pass 9580 32.8 22.8 144 44.5 29.9 149 Townsend Creek 8700 13.2 .0 * 30.6 17.2 178 ----- ----- Basin Index (%) 304 170 BIGHORN BASIN Bald Mtn. 9380 20.5 18.4 111 22.9 22.2 103 Bear Trap Meadow 8200 .0 .0 * 16.8 12.8 131 Bone Springs Div 9350 18.0 13.7 131 23.1 21.1 109 Grave Springs 8550 4.4 .9 489* 15.3 15.1 101 Kirwin 9550 19.3 7.5 257 30.6 16.1 190 Marquette 8760 15.7 -M * 26.2 -M * Middle Powder 7760 3.0 3.5 86 15.4 16.4 94 Owl Creek 8975 .2 .0 * 17.0 9.8 173 Powder River Pass 9480 3.6 4.0 90 18.9 17.5 108 Shell Creek 9580 14.2 14.6 97 19.3 18.7 103 Timber Creek 7950 1.6 .0 * 17.8 12.4 144 ----- ----- Basin Index (%) 135 122 SHOSHONE RIVER Blackwater 9780 40.1 23.8 168 48.2 26.2 184 Evening Star 9200 35.3 23.0 153 50.9 33.6 151 Marquette 8760 15.7 -M * 26.2 -M * Sylvan Road 7120 .0 .0 * 33.3 20.5 162 Younts Peak 8350 .3 11.1 3 33.6 19.8 170 ----- ----- Basin Index (%) 131 166 POWDER RIVER Bear Trap Meadow 8200 .0 .0 * 16.8 12.8 131 Cloud Peak Reservoir 9860 18.1 13.8 131 28.1 19.8 142 Grave Springs 8550 4.4 .9 489* 15.3 15.1 101 Hansen Sawmill 8360 6.6 .0 * 18.8 13.1 144 Middle Powder 7760 3.0 3.5 86 15.4 16.4 94 Powder River Pass 9480 3.6 4.0 90 18.9 17.5 108 Soldier Park 8720 8.0 -M * 22.4 -M * ----- ----- Basin Index (%) 161* 120 TONGUE RIVER Big Goose 7990 8.3 2.9 286 21.2 17.3 123 Bone Springs Div 9350 18.0 13.7 131 23.1 21.1 109 Burgess Junction 7880 6.3 6.9 91 17.2 17.2 100 Dome Lake 8880 13.9 4.7 296 24.3 19.2 127 Little Goose 8870 11.5 -M * 25.5 -M * Sucker Creek 8880 10.4 7.6 137 20.9 20.5 102 Tie Creek 6870 1.8 .0 * 24.2 17.4 139 ----- ----- Basin Index (%) 164 116 BELLE FOURCHE Cole Canyon 5910 .0 .0 * 13.5 15.0 90 ----- ----- Basin Index (%) * 90 CHEYENNE RIVER BASIN Blind Park 6890 .0 .0 * 14.1 17.0 83 North Rapid Creek 6130 .0 .0 * 12.3 14.7 84 ----- ----- Basin Index (%) * 83 UPPER N. PLATTE Arapaho Ridge 10960 21.5 16.5 130 32.2 28.5 113 Blackhall Mtn 9820 29.2 -M * 43.9 -M * Columbine 9160 .8 .6 133* 34.5 30.7 112 Divide Peak 8880 .4 3.9 10 27.4 26.6 103 Joe Wright 10120 15.3 20.2 76 36.3 33.0 110 Laprele Creek 8375 .3 .0 * 17.0 17.0 100 Med Bow 10500 36.1 -M * 42.7 -M * North French Creek 10130 22.0 28.2 78 35.6 33.9 105 Never Summer 10280 21.8 19.2 114 24.7 -M * Old Battle 10000 37.7 31.8 119 45.0 42.3 106 Rawah 9020 .7 .3 233* 22.1 18.9 117 Sage Creek Basin 7850 -M .0 * 19.0 17.5 109 Sand Lake 10050 30.8 27.0 114 34.1 32.1 106 South Brush Creek 8440 .0 .0 * 16.3 20.3 80 Tower 10500 40.9 46.9 87 54.5 48.1 113 Webber Springs 9250 12.0 9.9 121 39.2 32.2 122 Willow Creek Pass 9540 12.5 8.2 152 22.3 17.5 127 Zirkel 9340 11.0 6.5 169 49.4 33.4 148 ----- ----- Basin Index (%) 104 112 SWEETWATER Deer Park 9700 31.6 9.5 333 46.2 26.1 177 Larsen Creek 9000 .6 3.0 20 27.7 -M * South Pass 9040 29.3 4.9 598 36.0 22.6 159 ----- ----- Basin Index (%) 353 169 LOWER N. PLATTE Casper Mtn. 7900 1.8 2.9 62 21.0 20.6 102 Laprele Creek 8375 .3 .0 * 17.0 17.0 100 Reno Hill 8400 2.0 1.7 118 21.1 21.6 98 Windy Peak 7900 1.3 .0 * 17.7 15.1 117 ----- ----- Basin Index (%) 117 103 LARAMIE RIVER Brooklyn Lake 10240 12.9 14.6 88 28.6 27.4 104 Cinnabar Park 9574 6.5 10.5 62 29.0 29.6 98 Crow Creek 8330 -M .0 * 15.6 15.2 103 Deadman Hill 10220 16.4 15.3 107 28.4 23.2 122 Rawah 9020 .7 .3 233* 22.1 18.9 117 Roach 9700 9.5 10.0 95 28.1 24.8 113 ----- ----- Basin Index (%) 91 109 S. PLATTE Black Mountain 8920 2.4 -M * 20.2 -M * Crow Creek 8330 -M .0 * 15.6 15.2 103 Deadman Hill 10220 16.4 15.3 107 28.4 23.2 122 ----- ----- Basin Index (%) 107* 115 LITTLE SNAKE RIVER Battle Mountain 7440 .0 .0 * 20.4 18.7 109 Divide Peak 8880 .4 3.9 10 27.4 26.6 103 Elk River 8700 .2 .0 * 24.5 24.7 99 Little Snake River 8915 12.3 11.0 112 44.9 35.2 128 Old Battle 10000 37.7 31.8 119 45.0 42.3 106 Sage Creek Basin 7850 -M .0 * 19.0 17.5 109 Sandstone RS 8150 .0 .0 * 19.4 22.6 86 Whiskey Park 8950 17.0 20.0 85 37.1 34.0 109 ----- ----- Basin Index (%) 101 107 UPPER GREEN RIVER Big Sandy Opening 9080 13.0 1.1 1182* 27.1 17.0 159 Blind Bull Sum 8650 -M 18.8 * 39.6 23.4 169 East Rim Divide 7930 .0 .0 * 23.5 14.3 164 Elkhart Park G.S. 9400 12.2 4.7 260 27.7 17.0 163 Gros Ventre Summit 8750 -M 4.2 * -M 16.3 * Gunsight Pass 9820 20.2 9.3 217 29.6 17.8 166 Kendall R.S. 7740 .0 .0 * 31.7 16.9 188 Loomis Park 8240 13.3 1.0 1330* 35.4 20.7 171 New Fork Lake 8340 -M .0 * 21.7 13.7 158 Pocket Creek 9360 -M -M * -M -M * Snider Basin 8060 -M .0 * 29.7 16.9 176 Spring Creek Divide 9000 37.8 19.0 199 45.9 28.3 162 Triple Peak 8500 23.4 6.4 366 45.5 30.4 150 ----- ----- Basin Index (%) 289* 165 LOWER GREEN RIVER Blacks Fork Jct 8869 .0 -M * 19.7 -M * Buck Pasture 9632 4.7 -M * 28.4 -M * EF Blacks Fork GS 9360 -M -M * 23.9 -M * Hams Fork 7840 .0 .0 * 24.8 14.6 170 Hewinta 9500 .0 .0 * 22.2 17.9 124 Hickerson Park 9122 .2 .0 * 16.3 13.6 120 Hole-in-Rock 9168 .0 .0 * 17.2 13.2 130 Indian Creek 9425 35.7 17.0 210 46.8 27.2 172 Kelley R.S. 8180 7.2 1.2 600* 35.3 22.0 160 Spirit Lk 10235 4.6 -M * 22.5 -M * Steel Creek Park 10158 16.4 13.7 120 26.6 21.2 125 ----- ----- Basin Index (%) 187* 146 UPPER BEAR RIVER Bear River RS 8777 .0 -M * 22.1 -M * Bug Lake 7987 20.3 2.5 812 38.9 23.7 164 Burts Miller Ranch 8000 .0 -M * 12.3 -M * Chalk Creek #1 9171 23.6 13.7 172 42.4 31.1 136 Hayden Fork 9130 .2 .0 * 33.3 26.0 128 Kelley R.S. 8180 7.2 1.2 600* 35.3 22.0 160 Lily Lake 9133 .0 .0 * 23.9 21.5 111 Monte Cristo 8932 27.9 12.9 216 46.3 31.8 146 Salt River Summit 7760 2.5 .0 * 32.6 20.1 162 ----- ----- Basin Index (%) 270* 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.