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 FRIDAY: APRIL 28 , 2017 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7030 21.1 10.2 207 41.9 22.4 187 Black Bear 8170 51.9 37.1 140 59.7 41.2 145 Blind Bull Sum 8650 -M 23.9 * 38.7 20.9 185 Cottonwood Creek 7670 29.8 16.4 182 43.3 26.9 161 East Rim Divide 7930 11.1 8.6 129 22.4 12.6 178 Grand Targhee 9260 -M 43.8 * -M 33.9 * Granite Creek 6770 22.4 8.8 255 38.0 20.9 182 Grassy Lake 7265 39.6 29.9 132 61.1 38.7 158 Gros Ventre Summit 8750 21.6 12.0 180 26.1 14.3 183 Gunsight Pass 9820 -M 13.2 * 27.8 15.7 177 Lewis Lake Divide 7850 48.4 30.5 159 59.3 38.0 156 Phillips Bench 8200 41.7 25.6 163 50.4 30.2 167 Salt River Summit 7760 17.6 8.2 215 -M 18.1 * Snake River Station 6920 14.4 8.9 162 39.0 24.3 160 Spring Creek Divide 9000 44.1 24.1 183 43.6 25.8 169 Thumb Divide 7980 20.4 13.7 149 30.4 20.6 148 Togwotee Pass 9580 36.8 24.7 149 42.5 26.8 159 Two Ocean Plateau 9240 -M 29.4 * -M 29.6 * Willow Creek 8380 29.6 24.5 121 56.9 36.9 154 Younts Peak 8350 24.5 15.2 161 33.0 17.3 191 ----- ----- Basin Index (%) 159 165 MADISON-GALLATIN Black Bear 8170 51.9 37.1 140 59.7 41.2 145 Canyon 7870 18.8 11.3 166 28.6 17.7 162 Madison Plateau 7750 29.8 22.1 135 39.9 28.4 140 West Yellowstone 6700 .8 3.7 22 26.1 15.6 167 Whiskey Creek 6800 12.8 15.2 84 29.6 22.0 135 ----- ----- Basin Index (%) 128 147 YELLOWSTONE Beartooth Lake 9360 35.8 23.2 154 30.6 21.6 142 Burnt Mtn 5880 .0 .0 * 17.2 15.2 113 Canyon 7870 18.8 11.3 166 28.6 17.7 162 Cole Creek 7850 15.1 16.3 93 12.3 15.8 78 Evening Star 9200 41.1 24.8 166 48.3 29.9 162 Fisher Creek 9100 47.3 33.1 143 51.5 34.6 149 Northeast Entrance 7350 3.5 4.4 80 22.7 13.5 168 Parker Peak 9400 42.3 21.7 195 39.3 19.6 201 Sylvan Lake 8420 27.0 20.3 133 41.8 24.6 170 Thumb Divide 7980 20.4 13.7 149 30.4 20.6 148 Two Ocean Plateau 9240 -M 29.4 * -M 29.6 * White Mill 8700 40.5 23.8 170 39.2 25.8 152 Wolverine 7650 3.3 4.2 79 23.5 13.5 174 ----- ----- Basin Index (%) 150 153 WIND RIVER Burroughs Creek 8750 20.4 -M * 28.6 -M * Castle Creek 8400 7.9 -M * 17.3 -M * Cold Springs 9630 15.2 2.0 760 21.0 12.0 175 Deer Park 9700 35.5 16.3 218 41.8 23.0 182 Hobbs Park 10100 32.9 15.8 208 31.8 16.3 195 Kirwin 9550 25.1 10.3 244 27.7 13.4 207 Little Warm 9370 19.2 9.1 211 26.5 14.8 179 Owl Creek 8975 8.4 1.7 494 14.6 7.6 192 South Pass 9040 32.6 15.1 216 31.4 20.0 157 St. Lawrence Alt 8620 7.9 3.8 208 19.3 11.2 172 Togwotee Pass 9580 36.8 24.7 149 42.5 26.8 159 Townsend Creek 8700 18.1 8.2 221 25.5 14.6 175 ----- ----- Basin Index (%) 217 177 BIGHORN BASIN Bald Mtn. 9380 23.1 20.5 113 20.1 19.2 105 Bear Trap Meadow 8200 6.8 1.5 453 14.0 10.2 137 Bone Springs Div 9350 23.1 16.5 140 20.6 17.7 116 Grave Springs 8550 10.9 9.2 118 12.7 12.4 102 Kirwin 9550 25.1 10.3 244 27.7 13.4 207 Marquette 8760 18.6 -M * 22.2 -M * Middle Powder 7760 12.7 12.1 105 13.2 13.8 96 Owl Creek 8975 8.4 1.7 494 14.6 7.6 192 Powder River Pass 9480 11.5 9.8 117 17.2 14.6 118 Shell Creek 9580 19.9 16.0 124 17.4 15.8 110 Timber Creek 7950 7.3 3.5 209 14.1 9.5 148 ----- ----- Basin Index (%) 147 128 SHOSHONE RIVER Blackwater 9780 41.6 24.9 167 45.6 22.9 199 Evening Star 9200 41.1 24.8 166 48.3 29.9 162 Marquette 8760 18.6 -M * 22.2 -M * Sylvan Road 7120 .0 7.1 0 32.5 18.2 179 Younts Peak 8350 24.5 15.2 161 33.0 17.3 191 ----- ----- Basin Index (%) 149 181 POWDER RIVER Bear Trap Meadow 8200 6.8 1.5 453 14.0 10.2 137 Cloud Peak Reservoir 9860 20.8 16.5 126 24.7 16.1 153 Grave Springs 8550 10.9 9.2 118 12.7 12.4 102 Hansen Sawmill 8360 15.0 3.6 417 19.2 10.5 183 Middle Powder 7760 12.7 12.1 105 13.2 13.8 96 Powder River Pass 9480 11.5 9.8 117 17.2 14.6 118 Soldier Park 8720 17.5 -M * 19.4 -M * ----- ----- Basin Index (%) 147 130 TONGUE RIVER Big Goose 7990 14.1 9.1 155 18.2 13.6 134 Bone Springs Div 9350 23.1 16.5 140 20.6 17.7 116 Burgess Junction 7880 12.7 12.2 104 14.8 14.4 103 Dome Lake 8880 18.5 11.7 158 20.5 16.0 128 Little Goose 8870 17.8 -M * 22.6 -M * Sucker Creek 8880 15.3 12.5 122 17.1 16.9 101 Tie Creek 6870 3.3 2.8 118 18.2 13.8 132 ----- ----- Basin Index (%) 134 118 BELLE FOURCHE Cole Canyon 5910 1.5 .3 500* 11.2 11.4 98 ----- ----- Basin Index (%) 500* 98 CHEYENNE RIVER BASIN Blind Park 6890 .1 2.3 4 10.8 13.9 78 North Rapid Creek 6130 .0 2.3 0 9.6 11.9 81 ----- ----- Basin Index (%) 2 79 UPPER N. PLATTE Arapaho Ridge 10960 25.8 22.3 116 28.9 25.8 112 Blackhall Mtn 9820 36.7 -M * 41.4 -M * Columbine 9160 12.3 19.5 63 30.7 28.1 109 Divide Peak 8880 11.5 18.0 64 25.1 23.9 105 Joe Wright 10120 18.5 23.5 79 32.3 29.3 110 Laprele Creek 8375 6.3 6.9 91 14.2 14.7 97 Med Bow 10500 38.7 -M * 39.4 -M * North French Creek 10130 26.9 33.0 82 31.9 30.2 106 Never Summer 10280 24.7 21.5 115 22.2 -M * Old Battle 10000 39.5 34.6 114 41.8 38.6 108 Rawah 9020 5.8 7.4 78 20.0 17.0 118 Sage Creek Basin 7850 -M 1.4 * 17.8 15.9 112 Sand Lake 10050 32.1 31.2 103 30.7 28.5 108 South Brush Creek 8440 .3 9.9 3 14.7 17.5 84 Tower 10500 44.0 49.8 88 48.6 44.1 110 Webber Springs 9250 22.8 22.0 104 36.3 29.5 123 Willow Creek Pass 9540 18.9 13.8 137 20.2 15.4 131 Zirkel 9340 24.4 21.6 113 45.9 30.5 150 ----- ----- Basin Index (%) 94 113 SWEETWATER Deer Park 9700 35.5 16.3 218 41.8 23.0 182 Larsen Creek 9000 13.4 9.5 141 25.7 -M * South Pass 9040 32.6 15.1 216 31.4 20.0 157 ----- ----- Basin Index (%) 199 170 LOWER N. PLATTE Casper Mtn. 7900 12.2 14.1 87 17.5 17.6 99 Laprele Creek 8375 6.3 6.9 91 14.2 14.7 97 Reno Hill 8400 12.9 13.4 96 17.6 18.4 96 Windy Peak 7900 3.8 5.1 75 13.2 12.7 104 ----- ----- Basin Index (%) 89 99 LARAMIE RIVER Brooklyn Lake 10240 20.5 23.1 89 25.1 24.2 104 Cinnabar Park 9574 13.5 20.0 68 25.2 26.6 95 Crow Creek 8330 .2 .0 * 11.7 13.1 89 Deadman Hill 10220 21.2 18.6 114 23.5 20.2 116 Rawah 9020 5.8 7.4 78 20.0 17.0 118 Roach 9700 15.6 17.1 91 23.9 21.9 109 ----- ----- Basin Index (%) 89 105 S. PLATTE Black Mountain 8920 7.9 -M * 15.3 -M * Crow Creek 8330 .2 .0 * 11.7 13.1 89 Deadman Hill 10220 21.2 18.6 114 23.5 20.2 116 ----- ----- Basin Index (%) 115* 106 LITTLE SNAKE RIVER Battle Mountain 7440 .0 .6 0* 19.3 16.9 114 Divide Peak 8880 11.5 18.0 64 25.1 23.9 105 Elk River 8700 5.8 14.1 41 23.0 22.3 103 Little Snake River 8915 23.3 22.9 102 42.7 32.1 133 Old Battle 10000 39.5 34.6 114 41.8 38.6 108 Sage Creek Basin 7850 -M 1.4 * 17.8 15.9 112 Sandstone RS 8150 .0 7.2 0 18.2 20.4 89 Whiskey Park 8950 24.4 25.9 94 34.5 30.9 112 ----- ----- Basin Index (%) 85 111 UPPER GREEN RIVER Big Sandy Opening 9080 23.1 11.6 199 25.5 14.9 171 Blind Bull Sum 8650 -M 23.9 * 38.7 20.9 185 East Rim Divide 7930 11.1 8.6 129 22.4 12.6 178 Elkhart Park G.S. 9400 20.9 11.7 179 26.2 14.7 178 Gros Ventre Summit 8750 21.6 12.0 180 26.1 14.3 183 Gunsight Pass 9820 -M 13.2 * 27.8 15.7 177 Kendall R.S. 7740 15.5 5.6 277 30.6 15.2 201 Loomis Park 8240 24.7 11.4 217 34.2 18.6 184 New Fork Lake 8340 13.0 6.9 188 19.2 11.8 163 Pocket Creek 9360 -M -M * -M -M * Snider Basin 8060 16.1 9.9 163 28.8 15.3 188 Spring Creek Divide 9000 44.1 24.1 183 43.6 25.8 169 Triple Peak 8500 36.7 18.5 198 44.2 27.4 161 ----- ----- Basin Index (%) 189 177 LOWER GREEN RIVER Blacks Fork Jct 8869 5.1 -M * 18.3 -M * Buck Pasture 9632 16.5 -M * 26.8 -M * EF Blacks Fork GS 9360 12.4 -M * 20.6 -M * Hams Fork 7840 9.8 4.1 239 23.4 12.8 183 Hewinta 9500 6.9 5.7 121 20.2 15.8 128 Hickerson Park 9122 4.0 4.9 82 14.2 11.8 120 Hole-in-Rock 9168 4.7 3.8 124 15.0 11.2 134 Indian Creek 9425 43.4 23.7 183 44.2 24.6 180 Kelley R.S. 8180 24.3 11.8 206 33.3 19.8 168 Spirit Lk 10235 15.2 -M * 20.2 -M * Steel Creek Park 10158 21.7 16.8 129 24.3 18.7 130 ----- ----- Basin Index (%) 162 152 UPPER BEAR RIVER Bear River RS 8777 1.7 -M * 21.1 -M * Bug Lake 7987 32.6 15.9 205 36.6 21.3 172 Burts Miller Ranch 8000 .1 -M * 11.6 -M * Chalk Creek #1 9171 33.9 24.6 138 40.4 27.9 145 Hayden Fork 9130 15.1 9.9 153 33.3 23.3 143 Kelley R.S. 8180 24.3 11.8 206 33.3 19.8 168 Lily Lake 9133 12.5 9.8 128 22.6 19.2 118 Monte Cristo 8932 38.0 27.2 140 43.7 28.7 152 Salt River Summit 7760 17.6 8.2 215 -M 18.1 * ----- ----- Basin Index (%) 162 150 ----------------------------------------------------------------------------- -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.