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 THURSDAY: APRIL 27 , 2017 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7030 20.8 10.4 200 41.5 22.3 186 Black Bear 8170 51.5 37.0 139 59.4 41.1 145 Blind Bull Sum 8650 46.6 24.1 193 38.4 20.8 185 Cottonwood Creek 7670 28.8 16.7 172 42.4 26.8 158 East Rim Divide 7930 10.9 8.8 124 22.4 12.5 179 Grand Targhee 9260 54.4 43.6 125 48.6 33.6 145 Granite Creek 6770 22.2 9.0 247 37.7 20.8 181 Grassy Lake 7265 38.2 30.0 127 59.6 38.5 155 Gros Ventre Summit 8750 21.1 12.1 174 25.6 14.2 180 Gunsight Pass 9820 -M 13.3 * 27.4 15.5 177 Lewis Lake Divide 7850 48.0 30.7 156 58.7 37.8 155 Phillips Bench 8200 40.7 25.6 159 49.6 30.0 165 Salt River Summit 7760 17.5 8.2 213 -M 18.0 * Snake River Station 6920 13.9 9.4 148 38.6 24.2 160 Spring Creek Divide 9000 43.6 24.0 182 43.3 25.6 169 Thumb Divide 7980 20.1 13.9 145 30.1 20.4 148 Togwotee Pass 9580 35.8 24.6 146 41.6 26.6 156 Two Ocean Plateau 9240 -M 29.3 * -M 29.5 * Willow Creek 8380 28.9 24.9 116 55.8 36.7 152 Younts Peak 8350 24.3 15.1 161 32.9 17.2 191 ----- ----- Basin Index (%) 154 162 MADISON-GALLATIN Black Bear 8170 51.5 37.0 139 59.4 41.1 145 Canyon 7870 18.7 11.5 163 28.4 17.6 161 Madison Plateau 7750 29.7 22.2 134 39.7 28.3 140 West Yellowstone 6700 .7 4.2 17 25.8 15.6 165 Whiskey Creek 6800 12.8 15.4 83 29.3 21.9 134 ----- ----- Basin Index (%) 126 147 YELLOWSTONE Beartooth Lake 9360 35.6 23.4 152 30.4 21.4 142 Burnt Mtn 5880 .0 .0 * 16.8 15.0 112 Canyon 7870 18.7 11.5 163 28.4 17.6 161 Cole Creek 7850 14.2 16.3 87 11.5 15.7 73 Evening Star 9200 41.1 24.6 167 48.0 29.7 162 Fisher Creek 9100 47.2 33.2 142 51.3 34.4 149 Northeast Entrance 7350 3.4 4.6 74 22.6 13.4 169 Parker Peak 9400 41.7 21.8 191 38.9 19.6 198 Sylvan Lake 8420 26.4 20.3 130 41.2 24.5 168 Thumb Divide 7980 20.1 13.9 145 30.1 20.4 148 Two Ocean Plateau 9240 -M 29.3 * -M 29.5 * White Mill 8700 40.5 23.7 171 39.0 25.7 152 Wolverine 7650 3.1 4.8 65 23.0 13.4 172 ----- ----- Basin Index (%) 147 152 WIND RIVER Burroughs Creek 8750 20.0 -M * 28.5 -M * Castle Creek 8400 7.8 -M * 17.2 -M * Cold Springs 9630 15.4 2.4 642 21.0 11.9 176 Deer Park 9700 34.9 16.3 214 41.3 22.9 180 Hobbs Park 10100 32.4 15.8 205 31.7 16.2 196 Kirwin 9550 24.5 10.2 240 27.5 13.3 207 Little Warm 9370 18.9 9.2 205 26.2 14.7 178 Owl Creek 8975 8.2 2.0 410 14.4 7.5 192 South Pass 9040 31.9 15.2 210 30.9 19.8 156 St. Lawrence Alt 8620 7.6 4.2 181 19.0 11.0 173 Togwotee Pass 9580 35.8 24.6 146 41.6 26.6 156 Townsend Creek 8700 17.6 8.4 210 25.3 14.5 174 ----- ----- Basin Index (%) 210 176 BIGHORN BASIN Bald Mtn. 9380 22.6 20.6 110 19.7 19.1 103 Bear Trap Meadow 8200 6.5 1.6 406 13.8 10.1 137 Bone Springs Div 9350 22.6 16.5 137 20.4 17.6 116 Grave Springs 8550 10.1 9.1 111 12.0 12.3 98 Kirwin 9550 24.5 10.2 240 27.5 13.3 207 Marquette 8760 16.8 -M * 20.7 -M * Middle Powder 7760 12.3 12.2 101 13.2 13.7 96 Owl Creek 8975 8.2 2.0 410 14.4 7.5 192 Powder River Pass 9480 10.7 10.0 107 16.4 14.5 113 Shell Creek 9580 19.8 15.9 125 17.3 15.7 110 Timber Creek 7950 6.6 3.6 183 13.3 9.3 143 ----- ----- Basin Index (%) 141 126 SHOSHONE RIVER Blackwater 9780 40.9 24.7 166 45.0 22.8 197 Evening Star 9200 41.1 24.6 167 48.0 29.7 162 Marquette 8760 16.8 -M * 20.7 -M * Sylvan Road 7120 .1 7.5 1 32.3 18.1 178 Younts Peak 8350 24.3 15.1 161 32.9 17.2 191 ----- ----- Basin Index (%) 148 180 POWDER RIVER Bear Trap Meadow 8200 6.5 1.6 406 13.8 10.1 137 Cloud Peak Reservoir 9860 20.0 16.5 121 24.2 16.0 151 Grave Springs 8550 10.1 9.1 111 12.0 12.3 98 Hansen Sawmill 8360 14.1 3.8 371 19.0 10.3 184 Middle Powder 7760 12.3 12.2 101 13.2 13.7 96 Powder River Pass 9480 10.7 10.0 107 16.4 14.5 113 Soldier Park 8720 16.6 -M * 18.5 -M * ----- ----- Basin Index (%) 139 128 TONGUE RIVER Big Goose 7990 13.4 9.1 147 17.7 13.5 131 Bone Springs Div 9350 22.6 16.5 137 20.4 17.6 116 Burgess Junction 7880 12.2 12.3 99 14.3 14.3 100 Dome Lake 8880 18.0 11.7 154 20.1 15.9 126 Little Goose 8870 16.9 -M * 21.7 -M * Sucker Creek 8880 14.7 12.5 118 16.9 16.7 101 Tie Creek 6870 2.3 3.0 77 17.2 13.7 126 ----- ----- Basin Index (%) 128 116 BELLE FOURCHE Cole Canyon 5910 1.3 .4 325* 10.9 11.2 97 ----- ----- Basin Index (%) 325* 97 CHEYENNE RIVER BASIN Blind Park 6890 .0 2.7 0 10.7 13.8 78 North Rapid Creek 6130 .0 2.7 0 9.4 11.8 80 ----- ----- Basin Index (%) 0 79 UPPER N. PLATTE Arapaho Ridge 10960 25.4 22.1 115 28.6 25.7 111 Blackhall Mtn 9820 36.2 -M * 40.8 -M * Columbine 9160 11.6 19.9 58 30.1 27.9 108 Divide Peak 8880 11.4 17.9 64 24.8 23.8 104 Joe Wright 10120 18.0 23.4 77 31.7 29.2 109 Laprele Creek 8375 6.1 7.1 86 14.0 14.6 96 Med Bow 10500 38.1 -M * 38.8 -M * North French Creek 10130 26.4 32.9 80 31.3 30.0 104 Never Summer 10280 24.3 21.4 114 21.8 -M * Old Battle 10000 38.8 34.4 113 41.1 38.4 107 Rawah 9020 5.4 7.8 69 19.7 16.8 117 Sage Creek Basin 7850 -M 1.7 * 17.6 15.8 111 Sand Lake 10050 31.9 31.2 102 30.5 28.4 107 South Brush Creek 8440 .3 10.0 3 14.5 17.4 83 Tower 10500 43.2 49.7 87 48.0 43.8 110 Webber Springs 9250 22.4 22.0 102 35.8 29.4 122 Willow Creek Pass 9540 18.7 13.8 136 19.9 15.3 130 Zirkel 9340 23.9 21.9 109 45.2 30.5 148 ----- ----- Basin Index (%) 92 112 SWEETWATER Deer Park 9700 34.9 16.3 214 41.3 22.9 180 Larsen Creek 9000 13.2 9.6 138 25.5 -M * South Pass 9040 31.9 15.2 210 30.9 19.8 156 ----- ----- Basin Index (%) 195 169 LOWER N. PLATTE Casper Mtn. 7900 11.3 14.1 80 16.7 17.5 95 Laprele Creek 8375 6.1 7.1 86 14.0 14.6 96 Reno Hill 8400 12.3 13.6 90 17.2 18.3 94 Windy Peak 7900 3.8 5.5 69 13.1 12.6 104 ----- ----- Basin Index (%) 83 97 LARAMIE RIVER Brooklyn Lake 10240 20.3 23.0 88 24.9 24.1 103 Cinnabar Park 9574 13.1 20.1 65 24.8 26.4 94 Crow Creek 8330 .0 .0 * 11.5 13.0 88 Deadman Hill 10220 21.0 18.5 114 23.2 20.1 115 Rawah 9020 5.4 7.8 69 19.7 16.8 117 Roach 9700 15.3 17.0 90 23.5 21.7 108 ----- ----- Basin Index (%) 87 105 S. PLATTE Black Mountain 8920 7.8 -M * 15.2 -M * Crow Creek 8330 .0 .0 * 11.5 13.0 88 Deadman Hill 10220 21.0 18.5 114 23.2 20.1 115 ----- ----- Basin Index (%) 114* 105 LITTLE SNAKE RIVER Battle Mountain 7440 .0 1.0 0* 19.1 16.8 114 Divide Peak 8880 11.4 17.9 64 24.8 23.8 104 Elk River 8700 5.5 14.3 38 22.6 22.2 102 Little Snake River 8915 22.7 23.1 98 42.2 32.0 132 Old Battle 10000 38.8 34.4 113 41.1 38.4 107 Sage Creek Basin 7850 -M 1.7 * 17.6 15.8 111 Sandstone RS 8150 .0 7.7 0 17.9 20.3 88 Whiskey Park 8950 23.9 25.7 93 33.8 30.8 110 ----- ----- Basin Index (%) 82 109 UPPER GREEN RIVER Big Sandy Opening 9080 23.0 11.8 195 25.4 14.8 172 Blind Bull Sum 8650 46.6 24.1 193 38.4 20.8 185 East Rim Divide 7930 10.9 8.8 124 22.4 12.5 179 Elkhart Park G.S. 9400 20.8 11.8 176 26.0 14.6 178 Gros Ventre Summit 8750 21.1 12.1 174 25.6 14.2 180 Gunsight Pass 9820 -M 13.3 * 27.4 15.5 177 Kendall R.S. 7740 15.5 5.9 263 30.5 15.1 202 Loomis Park 8240 24.4 11.5 212 33.8 18.5 183 New Fork Lake 8340 12.8 7.1 180 19.2 11.7 164 Pocket Creek 9360 -M -M * -M -M * Snider Basin 8060 16.3 10.0 163 28.6 15.2 188 Spring Creek Divide 9000 43.6 24.0 182 43.3 25.6 169 Triple Peak 8500 36.0 18.8 191 43.5 27.3 159 ----- ----- Basin Index (%) 186 177 LOWER GREEN RIVER Blacks Fork Jct 8869 4.8 -M * 18.0 -M * Buck Pasture 9632 15.8 -M * 26.0 -M * EF Blacks Fork GS 9360 11.8 -M * 20.0 -M * Hams Fork 7840 9.6 4.4 218 23.2 12.7 183 Hewinta 9500 6.6 6.1 108 19.8 15.7 126 Hickerson Park 9122 4.3 5.0 86 14.2 11.7 121 Hole-in-Rock 9168 4.6 4.2 110 15.0 11.2 134 Indian Creek 9425 43.0 23.8 181 43.9 24.4 180 Kelley R.S. 8180 24.1 11.8 204 33.0 19.7 168 Spirit Lk 10235 15.1 -M * 20.1 -M * Steel Creek Park 10158 21.4 16.7 128 23.9 18.6 128 ----- ----- Basin Index (%) 158 152 UPPER BEAR RIVER Bear River RS 8777 1.2 -M * 20.5 -M * Bug Lake 7987 32.4 16.1 201 36.5 21.1 173 Burts Miller Ranch 8000 .0 -M * 11.5 -M * Chalk Creek #1 9171 33.3 24.7 135 39.8 27.8 143 Hayden Fork 9130 14.7 10.1 146 32.8 23.2 141 Kelley R.S. 8180 24.1 11.8 204 33.0 19.7 168 Lily Lake 9133 12.0 9.7 124 22.2 19.0 117 Monte Cristo 8932 37.5 27.3 137 43.2 28.5 152 Salt River Summit 7760 17.5 8.2 213 -M 18.0 * ----- ----- Basin Index (%) 159 149 ----------------------------------------------------------------------------- -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.