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: APRIL 30 , 2017 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7030 21.2 9.7 219 42.1 22.6 186 Black Bear 8170 51.6 37.4 138 59.7 41.6 144 Blind Bull Sum 8650 -M 23.4 * 38.7 21.2 183 Cottonwood Creek 7670 29.9 15.7 190 43.6 27.3 160 East Rim Divide 7930 11.1 8.3 134 22.4 12.9 174 Grand Targhee 9260 57.8 44.4 130 50.9 34.4 148 Granite Creek 6770 22.3 8.5 262 38.2 21.3 179 Grassy Lake 7265 39.6 29.4 135 61.1 39.1 156 Gros Ventre Summit 8750 -M 11.7 * -M 14.5 * Gunsight Pass 9820 -M 12.8 * 28.1 16.0 176 Lewis Lake Divide 7850 48.6 30.3 160 59.5 38.4 155 Phillips Bench 8200 41.7 25.6 163 50.5 30.5 166 Salt River Summit 7760 18.2 8.0 228 -M 18.3 * Snake River Station 6920 14.4 7.9 182 39.0 24.6 159 Spring Creek Divide 9000 44.5 24.3 183 43.9 26.1 168 Thumb Divide 7980 20.6 12.9 160 30.4 20.8 146 Togwotee Pass 9580 36.9 24.7 149 42.8 27.1 158 Two Ocean Plateau 9240 -M 29.7 * -M 29.9 * Willow Creek 8380 29.3 23.5 125 57.2 37.4 153 Younts Peak 8350 23.8 15.4 155 33.3 17.5 190 ----- ----- Basin Index (%) 157 162 MADISON-GALLATIN Black Bear 8170 51.6 37.4 138 59.7 41.6 144 Canyon 7870 18.8 10.8 174 28.7 17.9 160 Madison Plateau 7750 29.8 21.6 138 40.0 28.8 139 West Yellowstone 6700 .3 2.5 12 26.0 15.9 164 Whiskey Creek 6800 12.8 14.9 86 29.7 22.2 134 ----- ----- Basin Index (%) 130 146 YELLOWSTONE Beartooth Lake 9360 35.9 22.9 157 30.9 21.8 142 Burnt Mtn 5880 .9 .0 * 18.4 15.5 119 Canyon 7870 18.8 10.8 174 28.7 17.9 160 Cole Creek 7850 17.2 16.4 105 14.1 16.2 87 Evening Star 9200 41.5 24.9 167 48.7 30.2 161 Fisher Creek 9100 47.4 32.8 145 51.8 34.9 148 Northeast Entrance 7350 3.1 3.5 89 22.7 13.7 166 Parker Peak 9400 42.3 21.4 198 39.5 19.9 198 Sylvan Lake 8420 27.1 20.1 135 41.8 24.9 168 Thumb Divide 7980 20.6 12.9 160 30.4 20.8 146 Two Ocean Plateau 9240 -M 29.7 * -M 29.9 * White Mill 8700 40.4 23.8 170 39.4 26.1 151 Wolverine 7650 3.0 3.1 97 23.4 13.7 171 ----- ----- Basin Index (%) 155 153 WIND RIVER Burroughs Creek 8750 20.6 -M * 29.0 -M * Castle Creek 8400 8.2 -M * 17.2 -M * Cold Springs 9630 16.2 1.4 1157 22.2 12.4 179 Deer Park 9700 37.2 16.1 231 42.6 23.2 184 Hobbs Park 10100 35.1 16.0 219 31.9 16.5 193 Kirwin 9550 26.0 10.4 250 29.0 13.6 213 Little Warm 9370 19.3 8.8 219 26.8 15.3 175 Owl Creek 8975 9.1 1.2 758 15.2 7.8 195 South Pass 9040 34.5 15.0 230 33.5 20.2 166 St. Lawrence Alt 8620 9.7 3.0 323 20.5 11.4 180 Togwotee Pass 9580 36.9 24.7 149 42.8 27.1 158 Townsend Creek 8700 20.0 7.8 256 27.9 14.8 189 ----- ----- Basin Index (%) 234 180 BIGHORN BASIN Bald Mtn. 9380 24.1 20.5 118 20.7 19.5 106 Bear Trap Meadow 8200 7.2 1.1 655 14.7 10.4 141 Bone Springs Div 9350 23.3 16.6 140 20.9 18.0 116 Grave Springs 8550 11.2 9.4 119 13.3 12.6 106 Kirwin 9550 26.0 10.4 250 29.0 13.6 213 Marquette 8760 -M -M * 23.6 -M * Middle Powder 7760 13.1 11.8 111 13.7 14.0 98 Owl Creek 8975 9.1 1.2 758 15.2 7.8 195 Powder River Pass 9480 11.9 9.6 124 17.8 14.9 119 Shell Creek 9580 20.3 16.0 127 17.8 16.1 111 Timber Creek 7950 8.4 3.2 262 15.1 9.8 154 ----- ----- Basin Index (%) 155 130 SHOSHONE RIVER Blackwater 9780 41.9 25.2 166 46.1 23.3 198 Evening Star 9200 41.5 24.9 167 48.7 30.2 161 Marquette 8760 -M -M * 23.6 -M * Sylvan Road 7120 .0 6.3 0 32.5 18.5 176 Younts Peak 8350 23.8 15.4 155 33.3 17.5 190 ----- ----- Basin Index (%) 149 179 POWDER RIVER Bear Trap Meadow 8200 7.2 1.1 655 14.7 10.4 141 Cloud Peak Reservoir 9860 21.7 16.5 132 25.9 16.4 158 Grave Springs 8550 11.2 9.4 119 13.3 12.6 106 Hansen Sawmill 8360 15.9 2.9 548 18.9 10.7 177 Middle Powder 7760 13.1 11.8 111 13.7 14.0 98 Powder River Pass 9480 11.9 9.6 124 17.8 14.9 119 Soldier Park 8720 18.2 -M * 20.2 -M * ----- ----- Basin Index (%) 158 132 TONGUE RIVER Big Goose 7990 15.0 9.2 163 19.5 13.8 141 Bone Springs Div 9350 23.3 16.6 140 20.9 18.0 116 Burgess Junction 7880 13.2 12.1 109 15.7 14.6 108 Dome Lake 8880 19.5 11.5 170 21.5 16.2 133 Little Goose 8870 18.9 -M * 23.6 -M * Sucker Creek 8880 16.2 12.3 132 18.4 17.1 108 Tie Creek 6870 4.4 2.7 163 19.2 14.1 136 ----- ----- Basin Index (%) 142 123 BELLE FOURCHE Cole Canyon 5910 1.6 .3 533* 11.7 11.5 102 ----- ----- Basin Index (%) 533* 102 CHEYENNE RIVER BASIN Blind Park 6890 .0 1.3 0 10.8 14.1 77 North Rapid Creek 6130 .0 1.3 0 9.6 12.0 80 ----- ----- Basin Index (%) 0 78 UPPER N. PLATTE Arapaho Ridge 10960 26.4 22.3 118 29.4 26.0 113 Blackhall Mtn 9820 36.8 -M * 41.6 -M * Columbine 9160 12.5 18.6 67 30.8 28.4 108 Divide Peak 8880 12.2 18.0 68 25.7 24.1 107 Joe Wright 10120 18.7 23.4 80 32.6 29.6 110 Laprele Creek 8375 7.0 6.4 109 14.6 14.9 98 Med Bow 10500 39.4 -M * 40.0 -M * North French Creek 10130 27.7 32.9 84 32.7 30.5 107 Never Summer 10280 24.8 21.7 114 22.3 -M * Old Battle 10000 40.0 34.7 115 42.4 39.0 109 Rawah 9020 5.8 6.5 89 19.9 17.1 116 Sage Creek Basin 7850 -M 1.1 * 17.9 16.1 111 Sand Lake 10050 32.2 31.3 103 31.2 28.9 108 South Brush Creek 8440 .4 9.6 4 14.9 17.7 84 Tower 10500 44.1 49.9 88 49.6 44.5 111 Webber Springs 9250 23.1 21.9 105 36.7 29.8 123 Willow Creek Pass 9540 19.2 14.1 136 20.4 15.6 131 Zirkel 9340 24.6 21.2 116 46.1 30.8 150 ----- ----- Basin Index (%) 96 113 SWEETWATER Deer Park 9700 37.2 16.1 231 42.6 23.2 184 Larsen Creek 9000 13.7 9.3 147 25.8 -M * South Pass 9040 34.5 15.0 230 33.5 20.2 166 ----- ----- Basin Index (%) 211 175 LOWER N. PLATTE Casper Mtn. 7900 12.9 13.7 94 18.3 17.8 103 Laprele Creek 8375 7.0 6.4 109 14.6 14.9 98 Reno Hill 8400 13.0 12.8 102 17.8 18.7 95 Windy Peak 7900 4.4 4.4 100 13.7 12.9 106 ----- ----- Basin Index (%) 100 100 LARAMIE RIVER Brooklyn Lake 10240 20.8 23.3 89 25.7 24.5 105 Cinnabar Park 9574 14.2 19.7 72 26.1 26.8 97 Crow Creek 8330 .3 .0 * 11.9 13.3 89 Deadman Hill 10220 22.2 18.9 117 24.4 20.5 119 Rawah 9020 5.8 6.5 89 19.9 17.1 116 Roach 9700 16.4 17.2 95 24.6 22.2 111 ----- ----- Basin Index (%) 93 107 S. PLATTE Black Mountain 8920 8.7 -M * 16.1 -M * Crow Creek 8330 .3 .0 * 11.9 13.3 89 Deadman Hill 10220 22.2 18.9 117 24.4 20.5 119 ----- ----- Basin Index (%) 119* 107 LITTLE SNAKE RIVER Battle Mountain 7440 .0 .0 * 19.3 17.0 114 Divide Peak 8880 12.2 18.0 68 25.7 24.1 107 Elk River 8700 6.2 13.6 46 23.2 22.5 103 Little Snake River 8915 23.5 22.5 104 42.7 32.5 131 Old Battle 10000 40.0 34.7 115 42.4 39.0 109 Sage Creek Basin 7850 -M 1.1 * 17.9 16.1 111 Sandstone RS 8150 .0 6.3 0 18.4 20.6 89 Whiskey Park 8950 24.5 26.3 93 34.7 31.3 111 ----- ----- Basin Index (%) 88 110 UPPER GREEN RIVER Big Sandy Opening 9080 23.1 10.9 212 25.6 15.1 170 Blind Bull Sum 8650 -M 23.4 * 38.7 21.2 183 East Rim Divide 7930 11.1 8.3 134 22.4 12.9 174 Elkhart Park G.S. 9400 20.9 11.5 182 26.2 14.9 176 Gros Ventre Summit 8750 -M 11.7 * -M 14.5 * Gunsight Pass 9820 -M 12.8 * 28.1 16.0 176 Kendall R.S. 7740 15.7 4.8 327 30.6 15.4 199 Loomis Park 8240 25.0 11.2 223 34.3 18.8 182 New Fork Lake 8340 13.3 6.6 202 19.3 12.0 161 Pocket Creek 9360 -M -M * -M -M * Snider Basin 8060 15.7 9.5 165 29.0 15.5 187 Spring Creek Divide 9000 44.5 24.3 183 43.9 26.1 168 Triple Peak 8500 36.8 17.9 206 44.3 27.8 159 ----- ----- Basin Index (%) 196 175 LOWER GREEN RIVER Blacks Fork Jct 8869 5.8 -M * 18.7 -M * Buck Pasture 9632 17.1 -M * 27.3 -M * EF Blacks Fork GS 9360 13.0 -M * 21.4 -M * Hams Fork 7840 10.4 3.3 315 23.7 13.0 182 Hewinta 9500 8.1 5.0 162 20.7 16.0 129 Hickerson Park 9122 4.8 4.5 107 14.7 11.9 124 Hole-in-Rock 9168 5.4 2.9 186 15.5 11.4 136 Indian Creek 9425 44.1 23.3 189 44.9 24.9 180 Kelley R.S. 8180 24.4 11.7 209 33.6 20.1 167 Spirit Lk 10235 15.6 -M * 20.9 -M * Steel Creek Park 10158 22.6 17.0 133 25.2 18.9 133 ----- ----- Basin Index (%) 177 153 UPPER BEAR RIVER Bear River RS 8777 2.0 -M * 21.3 -M * Bug Lake 7987 33.7 15.4 219 37.5 21.6 174 Burts Miller Ranch 8000 .0 -M * 11.8 -M * Chalk Creek #1 9171 34.5 24.4 141 41.0 28.2 145 Hayden Fork 9130 15.5 9.5 163 33.5 23.6 142 Kelley R.S. 8180 24.4 11.7 209 33.6 20.1 167 Lily Lake 9133 13.0 9.9 131 23.0 19.4 119 Monte Cristo 8932 38.6 26.9 143 44.4 29.1 153 Salt River Summit 7760 18.2 8.0 228 -M 18.3 * ----- ----- Basin Index (%) 168 150 ----------------------------------------------------------------------------- -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.