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: APRIL 25 , 2017 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7030 20.6 10.8 191 41.1 22.1 186 Black Bear 8170 49.6 36.9 134 57.7 40.7 142 Blind Bull Sum 8650 45.7 24.3 188 37.8 20.7 183 Cottonwood Creek 7670 27.4 17.3 158 41.1 26.5 155 East Rim Divide 7930 10.6 9.0 118 22.0 12.4 177 Grand Targhee 9260 53.8 43.1 125 47.3 33.5 141 Granite Creek 6770 21.8 9.5 229 37.2 20.6 181 Grassy Lake 7265 37.1 30.2 123 58.2 38.2 152 Gros Ventre Summit 8750 20.7 12.5 166 25.4 14.0 181 Gunsight Pass 9820 24.6 13.5 182 26.8 15.4 174 Lewis Lake Divide 7850 46.8 30.7 152 57.8 37.5 154 Phillips Bench 8200 39.6 25.4 156 48.8 29.8 164 Salt River Summit 7760 17.1 8.5 201 -M 17.8 * Snake River Station 6920 13.5 10.1 134 37.7 24.0 157 Spring Creek Divide 9000 42.8 23.7 181 42.4 25.4 167 Thumb Divide 7980 19.5 14.2 137 29.4 20.2 146 Togwotee Pass 9580 35.3 24.4 145 41.1 26.3 156 Two Ocean Plateau 9240 -M 29.0 * -M 29.2 * Willow Creek 8380 27.9 25.7 109 54.0 36.3 149 Younts Peak 8350 24.1 15.1 160 32.4 17.0 191 ----- ----- Basin Index (%) 150 160 MADISON-GALLATIN Black Bear 8170 49.6 36.9 134 57.7 40.7 142 Canyon 7870 18.0 11.7 154 27.6 17.4 159 Madison Plateau 7750 29.0 22.6 128 38.9 28.0 139 West Yellowstone 6700 .7 5.1 14 25.4 15.4 165 Whiskey Creek 6800 12.5 15.5 81 28.7 21.7 132 ----- ----- Basin Index (%) 120 145 YELLOWSTONE Beartooth Lake 9360 35.1 23.6 149 30.0 21.2 142 Burnt Mtn 5880 .4 .0 * 16.0 14.9 107 Canyon 7870 18.0 11.7 154 27.6 17.4 159 Cole Creek 7850 13.0 16.3 80 10.5 15.2 69 Evening Star 9200 40.0 24.5 163 47.3 29.4 161 Fisher Creek 9100 46.7 33.2 141 50.8 34.1 149 Northeast Entrance 7350 3.7 5.1 73 22.3 13.3 168 Parker Peak 9400 40.4 21.8 185 37.9 19.3 196 Sylvan Lake 8420 25.5 20.3 126 40.3 24.2 167 Thumb Divide 7980 19.5 14.2 137 29.4 20.2 146 Two Ocean Plateau 9240 -M 29.0 * -M 29.2 * White Mill 8700 39.9 23.8 168 38.5 25.4 152 Wolverine 7650 3.0 5.6 54 22.6 13.2 171 ----- ----- Basin Index (%) 143 151 WIND RIVER Burroughs Creek 8750 19.9 -M * 28.3 -M * Castle Creek 8400 8.0 -M * 17.0 -M * Cold Springs 9630 15.2 3.1 490 20.8 11.6 179 Deer Park 9700 34.6 16.3 212 40.9 22.7 180 Hobbs Park 10100 31.7 15.6 203 31.2 15.7 199 Kirwin 9550 24.2 10.1 240 27.4 13.0 211 Little Warm 9370 18.6 9.5 196 25.9 14.5 179 Owl Creek 8975 8.2 2.7 304 14.3 7.3 196 South Pass 9040 31.8 15.2 209 30.7 19.4 158 St. Lawrence Alt 8620 7.5 4.9 153 18.6 10.6 175 Togwotee Pass 9580 35.3 24.4 145 41.1 26.3 156 Townsend Creek 8700 17.4 8.8 198 25.1 14.1 178 ----- ----- Basin Index (%) 203 178 BIGHORN BASIN Bald Mtn. 9380 21.8 20.4 107 19.1 18.7 102 Bear Trap Meadow 8200 5.3 2.0 265 12.3 9.9 124 Bone Springs Div 9350 21.6 16.4 132 19.7 17.3 114 Grave Springs 8550 9.1 9.2 99 10.9 12.2 89 Kirwin 9550 24.2 10.1 240 27.4 13.0 211 Marquette 8760 15.9 -M * 19.8 -M * Middle Powder 7760 10.8 12.3 88 10.1 13.3 76 Owl Creek 8975 8.2 2.7 304 14.3 7.3 196 Powder River Pass 9480 10.2 10.2 100 15.8 14.2 111 Shell Creek 9580 19.3 15.8 122 16.9 15.3 110 Timber Creek 7950 6.7 3.7 181 13.1 9.0 146 ----- ----- Basin Index (%) 133 123 SHOSHONE RIVER Blackwater 9780 40.4 24.4 166 44.7 22.5 199 Evening Star 9200 40.0 24.5 163 47.3 29.4 161 Marquette 8760 15.9 -M * 19.8 -M * Sylvan Road 7120 .0 8.3 0 31.8 17.9 178 Younts Peak 8350 24.1 15.1 160 32.4 17.0 191 ----- ----- Basin Index (%) 145 180 POWDER RIVER Bear Trap Meadow 8200 5.3 2.0 265 12.3 9.9 124 Cloud Peak Reservoir 9860 18.4 16.3 113 22.7 15.6 146 Grave Springs 8550 9.1 9.2 99 10.9 12.2 89 Hansen Sawmill 8360 12.8 4.3 298 18.4 10.1 182 Middle Powder 7760 10.8 12.3 88 10.1 13.3 76 Powder River Pass 9480 10.2 10.2 100 15.8 14.2 111 Soldier Park 8720 15.5 -M * 17.5 -M * ----- ----- Basin Index (%) 123 120 TONGUE RIVER Big Goose 7990 12.2 9.1 134 16.3 13.4 122 Bone Springs Div 9350 21.6 16.4 132 19.7 17.3 114 Burgess Junction 7880 11.1 12.4 90 13.1 13.9 94 Dome Lake 8880 16.9 11.8 143 18.7 15.4 121 Little Goose 8870 15.3 -M * 20.3 -M * Sucker Creek 8880 13.4 12.7 106 15.5 16.4 95 Tie Creek 6870 .6 3.5 17 15.6 13.6 115 ----- ----- Basin Index (%) 115 110 BELLE FOURCHE Cole Canyon 5910 .0 .8 0 9.0 10.9 83 ----- ----- Basin Index (%) 0 83 CHEYENNE RIVER BASIN Blind Park 6890 .0 3.6 0 10.5 13.6 77 North Rapid Creek 6130 .0 3.5 0 9.1 11.6 78 ----- ----- Basin Index (%) 0 78 UPPER N. PLATTE Arapaho Ridge 10960 25.1 21.8 115 28.2 25.4 111 Blackhall Mtn 9820 35.1 -M * 40.0 -M * Columbine 9160 11.3 20.6 55 29.5 27.7 106 Divide Peak 8880 10.7 18.1 59 24.2 23.5 103 Joe Wright 10120 17.6 23.2 76 31.4 28.8 109 Laprele Creek 8375 5.9 7.3 81 13.8 14.3 97 Med Bow 10500 36.9 -M * 37.9 -M * North French Creek 10130 25.6 32.6 79 30.6 29.5 104 Never Summer 10280 23.9 21.1 113 21.5 -M * Old Battle 10000 37.8 34.1 111 40.3 37.9 106 Rawah 9020 5.3 8.0 66 19.5 16.6 117 Sage Creek Basin 7850 -M 2.7 * 17.3 15.6 111 Sand Lake 10050 31.3 31.0 101 29.7 27.9 106 South Brush Creek 8440 .6 10.0 6 14.3 17.0 84 Tower 10500 41.8 49.3 85 47.2 43.3 109 Webber Springs 9250 21.8 21.9 100 35.2 29.0 121 Willow Creek Pass 9540 18.4 13.7 134 19.8 15.1 131 Zirkel 9340 23.3 22.3 104 44.5 30.3 147 ----- ----- Basin Index (%) 90 111 SWEETWATER Deer Park 9700 34.6 16.3 212 40.9 22.7 180 Larsen Creek 9000 12.8 9.8 131 25.1 -M * South Pass 9040 31.8 15.2 209 30.7 19.4 158 ----- ----- Basin Index (%) 192 170 LOWER N. PLATTE Casper Mtn. 7900 9.5 14.2 67 15.0 17.1 88 Laprele Creek 8375 5.9 7.3 81 13.8 14.3 97 Reno Hill 8400 11.8 13.8 86 16.4 17.9 92 Windy Peak 7900 3.9 6.1 64 13.0 12.3 106 ----- ----- Basin Index (%) 75 94 LARAMIE RIVER Brooklyn Lake 10240 19.8 22.8 87 24.4 23.7 103 Cinnabar Park 9574 12.7 20.0 64 24.2 26.1 93 Crow Creek 8330 .3 .0 * 11.4 12.8 89 Deadman Hill 10220 20.6 18.1 114 22.9 19.8 116 Rawah 9020 5.3 8.0 66 19.5 16.6 117 Roach 9700 14.9 16.8 89 23.2 21.4 108 ----- ----- Basin Index (%) 86 104 S. PLATTE Black Mountain 8920 7.7 -M * 14.8 -M * Crow Creek 8330 .3 .0 * 11.4 12.8 89 Deadman Hill 10220 20.6 18.1 114 22.9 19.8 116 ----- ----- Basin Index (%) 115* 105 LITTLE SNAKE RIVER Battle Mountain 7440 .0 1.9 0 18.6 16.5 113 Divide Peak 8880 10.7 18.1 59 24.2 23.5 103 Elk River 8700 4.9 14.6 34 22.1 21.9 101 Little Snake River 8915 21.9 23.3 94 41.3 31.7 130 Old Battle 10000 37.8 34.1 111 40.3 37.9 106 Sage Creek Basin 7850 -M 2.7 * 17.3 15.6 111 Sandstone RS 8150 .0 8.6 0 17.3 20.1 86 Whiskey Park 8950 22.7 25.6 89 32.8 30.4 108 ----- ----- Basin Index (%) 78 108 UPPER GREEN RIVER Big Sandy Opening 9080 22.4 12.1 185 25.1 14.6 172 Blind Bull Sum 8650 45.7 24.3 188 37.8 20.7 183 East Rim Divide 7930 10.6 9.0 118 22.0 12.4 177 Elkhart Park G.S. 9400 20.5 11.8 174 25.8 14.4 179 Gros Ventre Summit 8750 20.7 12.5 166 25.4 14.0 181 Gunsight Pass 9820 24.6 13.5 182 26.8 15.4 174 Kendall R.S. 7740 15.5 6.6 235 30.2 15.0 201 Loomis Park 8240 23.8 11.9 200 33.4 18.3 183 New Fork Lake 8340 12.5 7.4 169 19.0 11.6 164 Pocket Creek 9360 -M -M * -M -M * Snider Basin 8060 16.4 10.1 162 28.4 15.1 188 Spring Creek Divide 9000 42.8 23.7 181 42.4 25.4 167 Triple Peak 8500 35.3 19.0 186 42.8 27.0 159 ----- ----- Basin Index (%) 180 176 LOWER GREEN RIVER Blacks Fork Jct 8869 4.6 -M * 17.8 -M * Buck Pasture 9632 15.4 -M * 25.6 -M * EF Blacks Fork GS 9360 11.4 -M * 19.6 -M * Hams Fork 7840 9.6 5.0 192 23.1 12.5 185 Hewinta 9500 6.4 6.9 93 19.5 15.5 126 Hickerson Park 9122 4.2 5.0 84 14.0 11.5 122 Hole-in-Rock 9168 4.6 5.0 92 14.9 11.0 135 Indian Creek 9425 42.0 23.7 177 43.4 24.2 179 Kelley R.S. 8180 23.7 11.9 199 32.6 19.5 167 Spirit Lk 10235 14.6 -M * 20.0 -M * Steel Creek Park 10158 20.9 16.5 127 23.6 18.4 128 ----- ----- Basin Index (%) 151 152 UPPER BEAR RIVER Bear River RS 8777 1.4 -M * 20.4 -M * Bug Lake 7987 31.6 16.2 195 36.2 20.9 173 Burts Miller Ranch 8000 .2 -M * 11.4 -M * Chalk Creek #1 9171 32.5 24.6 132 39.1 27.5 142 Hayden Fork 9130 14.4 10.7 135 32.3 22.9 141 Kelley R.S. 8180 23.7 11.9 199 32.6 19.5 167 Lily Lake 9133 11.8 9.9 119 22.0 18.8 117 Monte Cristo 8932 36.7 27.4 134 42.5 28.2 151 Salt River Summit 7760 17.1 8.5 201 -M 17.8 * ----- ----- Basin Index (%) 154 149 ----------------------------------------------------------------------------- -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.