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 23 , 2017 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7030 20.9 11.3 185 40.7 22.0 185 Black Bear 8170 48.4 36.8 132 56.4 40.3 140 Blind Bull Sum 8650 45.2 24.3 186 37.4 20.5 182 Cottonwood Creek 7670 27.0 17.8 152 40.6 26.2 155 East Rim Divide 7930 10.8 9.3 116 21.6 12.3 176 Grand Targhee 9260 52.0 42.7 122 46.1 33.0 140 Granite Creek 6770 21.9 10.0 219 36.9 20.5 180 Grassy Lake 7265 37.5 30.6 123 57.8 37.8 153 Gros Ventre Summit 8750 -M 12.9 * -M 13.9 * Gunsight Pass 9820 24.4 13.6 179 26.3 15.2 173 Lewis Lake Divide 7850 46.7 30.7 152 57.5 37.2 155 Phillips Bench 8200 39.2 25.3 155 48.2 29.5 163 Salt River Summit 7760 17.2 8.9 193 30.2 17.6 172 Snake River Station 6920 14.5 10.9 133 37.3 23.8 157 Spring Creek Divide 9000 42.3 23.6 179 41.9 25.2 166 Thumb Divide 7980 20.2 14.3 141 29.2 20.0 146 Togwotee Pass 9580 35.1 24.3 144 40.7 26.0 157 Two Ocean Plateau 9240 -M 28.7 * -M 28.9 * Willow Creek 8380 27.9 26.4 106 53.1 35.8 148 Younts Peak 8350 24.0 15.1 159 32.4 16.9 192 ----- ----- Basin Index (%) 148 160 MADISON-GALLATIN Black Bear 8170 48.4 36.8 132 56.4 40.3 140 Canyon 7870 17.2 12.0 143 26.7 17.2 155 Madison Plateau 7750 28.1 22.8 123 38.0 27.8 137 West Yellowstone 6700 .4 6.0 7 24.1 15.3 158 Whiskey Creek 6800 12.1 15.4 79 28.0 21.5 130 ----- ----- Basin Index (%) 114 142 YELLOWSTONE Beartooth Lake 9360 34.6 23.6 147 29.7 21.0 141 Burnt Mtn 5880 .1 .0 * 15.5 14.5 107 Canyon 7870 17.2 12.0 143 26.7 17.2 155 Cole Creek 7850 12.4 16.4 76 10.1 14.9 68 Evening Star 9200 40.1 24.4 164 47.1 29.1 162 Fisher Creek 9100 45.6 33.0 138 50.1 33.8 148 Northeast Entrance 7350 3.2 5.7 56 21.6 13.1 165 Parker Peak 9400 39.5 21.4 185 37.2 19.1 195 Sylvan Lake 8420 25.3 20.3 125 39.7 24.0 165 Thumb Divide 7980 20.2 14.3 141 29.2 20.0 146 Two Ocean Plateau 9240 -M 28.7 * -M 28.9 * White Mill 8700 39.0 23.7 165 38.1 25.2 151 Wolverine 7650 3.2 6.2 52 22.2 13.1 169 ----- ----- Basin Index (%) 140 150 WIND RIVER Burroughs Creek 8750 20.5 -M * 28.2 -M * Castle Creek 8400 8.1 -M * 16.8 -M * Cold Springs 9630 15.7 3.9 403 20.8 11.3 184 Deer Park 9700 34.4 16.4 210 40.6 22.1 184 Hobbs Park 10100 31.7 15.3 207 31.2 15.3 204 Kirwin 9550 24.1 10.1 239 27.3 12.8 213 Little Warm 9370 18.7 9.9 189 25.8 14.2 182 Owl Creek 8975 8.7 3.2 272 14.3 7.1 201 South Pass 9040 31.9 15.3 208 30.6 19.0 161 St. Lawrence Alt 8620 8.2 5.1 161 18.6 10.3 181 Togwotee Pass 9580 35.1 24.3 144 40.7 26.0 157 Townsend Creek 8700 17.7 9.0 197 25.0 13.7 182 ----- ----- Basin Index (%) 201 181 BIGHORN BASIN Bald Mtn. 9380 21.5 20.1 107 18.8 18.5 102 Bear Trap Meadow 8200 5.1 2.5 204 11.8 9.7 122 Bone Springs Div 9350 21.4 16.3 131 19.4 17.1 113 Grave Springs 8550 8.5 9.4 90 10.4 11.9 87 Kirwin 9550 24.1 10.1 239 27.3 12.8 213 Marquette 8760 15.6 -M * 19.7 -M * Middle Powder 7760 10.4 12.4 84 10.1 13.1 77 Owl Creek 8975 8.7 3.2 272 14.3 7.1 201 Powder River Pass 9480 10.2 10.2 100 15.7 14.0 112 Shell Creek 9580 19.4 15.7 124 16.8 15.1 111 Timber Creek 7950 7.0 4.2 167 13.0 8.8 148 ----- ----- Basin Index (%) 131 123 SHOSHONE RIVER Blackwater 9780 40.0 24.1 166 44.3 22.2 200 Evening Star 9200 40.1 24.4 164 47.1 29.1 162 Marquette 8760 15.6 -M * 19.7 -M * Sylvan Road 7120 .0 8.9 0 31.6 17.8 178 Younts Peak 8350 24.0 15.1 159 32.4 16.9 192 ----- ----- Basin Index (%) 144 181 POWDER RIVER Bear Trap Meadow 8200 5.1 2.5 204 11.8 9.7 122 Cloud Peak Reservoir 9860 18.7 16.1 116 22.5 15.3 147 Grave Springs 8550 8.5 9.4 90 10.4 11.9 87 Hansen Sawmill 8360 12.4 4.5 276 17.5 9.9 177 Middle Powder 7760 10.4 12.4 84 10.1 13.1 77 Powder River Pass 9480 10.2 10.2 100 15.7 14.0 112 Soldier Park 8720 15.7 -M * 17.2 -M * ----- ----- Basin Index (%) 119 119 TONGUE RIVER Big Goose 7990 12.2 9.2 133 16.1 13.1 123 Bone Springs Div 9350 21.4 16.3 131 19.4 17.1 113 Burgess Junction 7880 11.2 12.6 89 13.1 13.7 96 Dome Lake 8880 16.9 11.8 143 18.5 15.2 122 Little Goose 8870 15.1 -M * 19.8 -M * Sucker Creek 8880 13.7 12.7 108 15.5 16.1 96 Tie Creek 6870 .1 3.9 3 14.8 13.3 111 ----- ----- Basin Index (%) 114 110 BELLE FOURCHE Cole Canyon 5910 .0 1.4 0 8.8 10.7 82 ----- ----- Basin Index (%) 0 82 CHEYENNE RIVER BASIN Blind Park 6890 .0 3.9 0 10.4 13.4 78 North Rapid Creek 6130 .0 3.9 0 8.8 11.4 77 ----- ----- Basin Index (%) 0 77 UPPER N. PLATTE Arapaho Ridge 10960 24.8 21.5 115 27.5 24.7 111 Blackhall Mtn 9820 34.6 -M * 39.0 -M * Columbine 9160 11.1 20.7 54 28.6 27.3 105 Divide Peak 8880 11.1 18.3 61 23.7 23.2 102 Joe Wright 10120 17.1 22.7 75 30.5 28.3 108 Laprele Creek 8375 6.7 7.4 91 13.6 14.0 97 Med Bow 10500 36.3 -M * 36.9 -M * North French Creek 10130 24.6 32.2 76 29.5 29.1 101 Never Summer 10280 23.3 20.9 111 21.0 -M * Old Battle 10000 36.9 33.5 110 39.5 37.5 105 Rawah 9020 5.2 8.1 64 18.8 15.8 119 Sage Creek Basin 7850 -M 4.2 * 17.0 15.4 110 Sand Lake 10050 30.7 30.7 100 29.3 27.3 107 South Brush Creek 8440 .3 9.8 3 13.5 16.7 81 Tower 10500 40.1 48.8 82 45.8 42.9 107 Webber Springs 9250 22.5 21.8 103 34.2 28.8 119 Willow Creek Pass 9540 18.3 13.5 136 19.3 14.7 131 Zirkel 9340 23.3 22.5 104 43.5 30.0 145 ----- ----- Basin Index (%) 89 110 SWEETWATER Deer Park 9700 34.4 16.4 210 40.6 22.1 184 Larsen Creek 9000 12.9 10.0 129 24.8 -M * South Pass 9040 31.9 15.3 208 30.6 19.0 161 ----- ----- Basin Index (%) 190 173 LOWER N. PLATTE Casper Mtn. 7900 10.0 14.2 70 14.8 16.9 88 Laprele Creek 8375 6.7 7.4 91 13.6 14.0 97 Reno Hill 8400 12.1 14.0 86 16.3 17.5 93 Windy Peak 7900 4.4 6.3 70 12.8 12.0 107 ----- ----- Basin Index (%) 79 95 LARAMIE RIVER Brooklyn Lake 10240 20.5 22.5 91 24.2 23.3 104 Cinnabar Park 9574 12.7 19.9 64 23.4 25.8 91 Crow Creek 8330 1.1 .2 550* 11.0 12.2 90 Deadman Hill 10220 20.5 17.7 116 22.3 19.4 115 Rawah 9020 5.2 8.1 64 18.8 15.8 119 Roach 9700 14.9 16.7 89 22.3 21.0 106 ----- ----- Basin Index (%) 88 104 S. PLATTE Black Mountain 8920 8.1 -M * 14.5 -M * Crow Creek 8330 1.1 .2 550* 11.0 12.2 90 Deadman Hill 10220 20.5 17.7 116 22.3 19.4 115 ----- ----- Basin Index (%) 121* 105 LITTLE SNAKE RIVER Battle Mountain 7440 .0 2.9 0 17.7 16.3 109 Divide Peak 8880 11.1 18.3 61 23.7 23.2 102 Elk River 8700 5.6 14.8 38 21.1 21.7 97 Little Snake River 8915 21.7 23.6 92 40.1 31.3 128 Old Battle 10000 36.9 33.5 110 39.5 37.5 105 Sage Creek Basin 7850 -M 4.2 * 17.0 15.4 110 Sandstone RS 8150 -M 9.6 * 16.6 19.8 84 Whiskey Park 8950 22.1 25.6 86 31.7 30.1 105 ----- ----- Basin Index (%) 82 106 UPPER GREEN RIVER Big Sandy Opening 9080 21.9 12.3 178 24.7 14.4 172 Blind Bull Sum 8650 45.2 24.3 186 37.4 20.5 182 East Rim Divide 7930 10.8 9.3 116 21.6 12.3 176 Elkhart Park G.S. 9400 19.9 11.8 169 25.2 14.3 176 Gros Ventre Summit 8750 -M 12.9 * -M 13.9 * Gunsight Pass 9820 24.4 13.6 179 26.3 15.2 173 Kendall R.S. 7740 15.8 7.3 216 29.8 14.9 200 Loomis Park 8240 24.4 12.3 198 33.1 18.2 182 New Fork Lake 8340 12.5 8.1 154 18.8 11.5 163 Pocket Creek 9360 -M -M * -M -M * Snider Basin 8060 15.8 10.4 152 28.2 15.0 188 Spring Creek Divide 9000 42.3 23.6 179 41.9 25.2 166 Triple Peak 8500 35.3 19.2 184 42.5 26.7 159 ----- ----- Basin Index (%) 176 175 LOWER GREEN RIVER Blacks Fork Jct 8869 5.2 -M * 17.3 -M * Buck Pasture 9632 15.7 -M * 24.9 -M * EF Blacks Fork GS 9360 11.8 -M * 19.0 -M * Hams Fork 7840 10.3 5.7 181 22.7 12.3 185 Hewinta 9500 6.9 7.4 93 19.0 15.3 124 Hickerson Park 9122 4.7 5.1 92 13.7 11.3 121 Hole-in-Rock 9168 5.5 5.5 100 14.6 10.8 135 Indian Creek 9425 41.7 23.5 177 42.8 24.0 178 Kelley R.S. 8180 23.6 12.0 197 31.9 19.3 165 Spirit Lk 10235 15.1 -M * 19.6 -M * Steel Creek Park 10158 20.3 16.4 124 22.9 18.1 127 ----- ----- Basin Index (%) 149 151 UPPER BEAR RIVER Bear River RS 8777 1.7 -M * 19.9 -M * Bug Lake 7987 31.9 16.4 195 35.7 20.7 172 Burts Miller Ranch 8000 .0 -M * 11.2 -M * Chalk Creek #1 9171 32.2 24.5 131 38.4 27.2 141 Hayden Fork 9130 14.8 11.0 135 31.5 22.7 139 Kelley R.S. 8180 23.6 12.0 197 31.9 19.3 165 Lily Lake 9133 11.6 10.1 115 21.4 18.6 115 Monte Cristo 8932 36.2 27.3 133 41.8 27.9 150 Salt River Summit 7760 17.2 8.9 193 30.2 17.6 172 ----- ----- Basin Index (%) 152 150 ----------------------------------------------------------------------------- -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.