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 MONDAY: MAY 1 , 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 9.3 222 42.1 22.8 185 Black Bear 8170 51.4 37.4 137 59.8 41.7 143 Blind Bull Sum 8650 -M 23.1 * 38.9 21.3 183 Cottonwood Creek 7670 30.0 15.3 196 43.6 27.5 159 East Rim Divide 7930 10.9 8.2 133 22.5 12.9 174 Grand Targhee 9260 57.8 44.8 129 51.0 34.6 147 Granite Creek 6770 22.0 8.3 265 38.2 21.3 179 Grassy Lake 7265 39.6 29.1 136 61.4 39.3 156 Gros Ventre Summit 8750 21.2 11.6 183 26.4 14.6 181 Gunsight Pass 9820 -M 12.5 * 28.2 16.0 176 Lewis Lake Divide 7850 48.7 30.1 162 59.7 38.5 155 Phillips Bench 8200 41.9 25.4 165 50.6 30.7 165 Salt River Summit 7760 18.1 7.9 229 -M 18.4 * Snake River Station 6920 14.3 7.4 193 39.3 24.7 159 Spring Creek Divide 9000 44.5 24.3 183 44.3 26.2 169 Thumb Divide 7980 20.6 12.4 166 30.6 20.9 146 Togwotee Pass 9580 37.0 24.7 150 42.9 27.2 158 Two Ocean Plateau 9240 -M 29.7 * -M 30.1 * Willow Creek 8380 29.3 23.0 127 57.3 37.5 153 Younts Peak 8350 23.5 15.5 152 33.8 17.6 192 ----- ----- Basin Index (%) 159 162 MADISON-GALLATIN Black Bear 8170 51.4 37.4 137 59.8 41.7 143 Canyon 7870 18.7 10.4 180 28.8 18.0 160 Madison Plateau 7750 29.8 21.3 140 40.0 28.9 138 West Yellowstone 6700 .0 1.8 0 26.0 16.0 162 Whiskey Creek 6800 12.8 14.6 88 29.7 22.3 133 ----- ----- Basin Index (%) 132 145 YELLOWSTONE Beartooth Lake 9360 36.1 22.8 158 31.0 21.9 142 Burnt Mtn 5880 .4 .0 * 18.4 15.9 116 Canyon 7870 18.7 10.4 180 28.8 18.0 160 Cole Creek 7850 17.1 16.6 103 14.2 16.4 87 Evening Star 9200 41.7 24.9 167 48.8 30.4 161 Fisher Creek 9100 47.6 32.7 146 51.8 35.1 148 Northeast Entrance 7350 2.9 3.0 97 23.0 13.8 167 Parker Peak 9400 42.6 21.3 200 39.8 20.0 199 Sylvan Lake 8420 27.1 19.8 137 41.9 25.1 167 Thumb Divide 7980 20.6 12.4 166 30.6 20.9 146 Two Ocean Plateau 9240 -M 29.7 * -M 30.1 * White Mill 8700 40.4 23.8 170 39.4 26.3 150 Wolverine 7650 2.9 2.5 116 23.6 13.7 172 ----- ----- Basin Index (%) 157 152 WIND RIVER Burroughs Creek 8750 20.3 -M * 29.2 -M * Castle Creek 8400 7.5 -M * 17.3 -M * Cold Springs 9630 16.1 1.3 1238 22.3 12.4 180 Deer Park 9700 37.2 16.0 232 43.1 23.4 184 Hobbs Park 10100 35.0 16.0 219 32.4 16.6 195 Kirwin 9550 26.2 10.4 252 29.1 13.8 211 Little Warm 9370 19.2 8.7 221 26.9 15.3 176 Owl Creek 8975 9.0 1.0 900 15.3 7.9 194 South Pass 9040 34.5 14.9 232 33.6 20.3 166 St. Lawrence Alt 8620 9.6 2.5 384 20.5 11.5 178 Togwotee Pass 9580 37.0 24.7 150 42.9 27.2 158 Townsend Creek 8700 19.9 7.5 265 28.1 14.9 189 ----- ----- Basin Index (%) 237 180 BIGHORN BASIN Bald Mtn. 9380 24.1 20.5 118 20.8 19.7 106 Bear Trap Meadow 8200 7.0 .9 778 14.6 10.6 138 Bone Springs Div 9350 23.4 16.5 142 21.2 18.2 116 Grave Springs 8550 11.2 9.4 119 13.5 12.8 105 Kirwin 9550 26.2 10.4 252 29.1 13.8 211 Marquette 8760 20.4 -M * 23.6 -M * Middle Powder 7760 13.0 11.6 112 13.8 14.1 98 Owl Creek 8975 9.0 1.0 900 15.3 7.9 194 Powder River Pass 9480 11.7 9.4 124 17.9 15.1 119 Shell Creek 9580 20.2 15.9 127 18.0 16.3 110 Timber Creek 7950 8.1 3.1 261 15.1 9.9 153 ----- ----- Basin Index (%) 156 130 SHOSHONE RIVER Blackwater 9780 42.0 25.3 166 46.2 23.4 197 Evening Star 9200 41.7 24.9 167 48.8 30.4 161 Marquette 8760 20.4 -M * 23.6 -M * Sylvan Road 7120 .0 5.8 0 32.5 18.6 175 Younts Peak 8350 23.5 15.5 152 33.8 17.6 192 ----- ----- Basin Index (%) 150 179 POWDER RIVER Bear Trap Meadow 8200 7.0 .9 778 14.6 10.6 138 Cloud Peak Reservoir 9860 21.8 16.5 132 26.0 16.6 157 Grave Springs 8550 11.2 9.4 119 13.5 12.8 105 Hansen Sawmill 8360 15.8 2.5 632 18.9 10.8 175 Middle Powder 7760 13.0 11.6 112 13.8 14.1 98 Powder River Pass 9480 11.7 9.4 124 17.9 15.1 119 Soldier Park 8720 18.1 -M * 20.3 -M * ----- ----- Basin Index (%) 160 131 TONGUE RIVER Big Goose 7990 15.1 9.2 164 19.5 14.0 139 Bone Springs Div 9350 23.4 16.5 142 21.2 18.2 116 Burgess Junction 7880 13.2 12.1 109 15.8 14.8 107 Dome Lake 8880 19.6 11.4 172 21.6 16.4 132 Little Goose 8870 19.0 -M * 23.7 -M * Sucker Creek 8880 16.3 12.2 134 18.6 17.3 108 Tie Creek 6870 4.4 2.7 163 19.3 14.3 135 ----- ----- Basin Index (%) 144 122 BELLE FOURCHE Cole Canyon 5910 1.6 .3 533* 11.7 11.8 99 ----- ----- Basin Index (%) 533* 99 CHEYENNE RIVER BASIN Blind Park 6890 .0 .8 0 10.8 14.3 76 North Rapid Creek 6130 .0 .8 0 9.6 12.2 79 ----- ----- Basin Index (%) 0 77 UPPER N. PLATTE Arapaho Ridge 10960 26.6 22.3 119 29.6 26.2 113 Blackhall Mtn 9820 36.9 -M * 41.7 -M * Columbine 9160 12.9 18.2 71 31.7 28.5 111 Divide Peak 8880 12.3 18.0 68 25.9 24.3 107 Joe Wright 10120 19.2 23.3 82 32.9 29.8 110 Laprele Creek 8375 6.5 6.1 107 14.8 15.0 99 Med Bow 10500 39.6 -M * 40.2 -M * North French Creek 10130 27.8 32.9 84 32.9 30.7 107 Never Summer 10280 25.0 21.8 115 22.5 -M * Old Battle 10000 40.2 34.7 116 42.7 39.2 109 Rawah 9020 5.8 6.1 95 20.3 17.2 118 Sage Creek Basin 7850 -M 1.1 * 17.9 16.1 111 Sand Lake 10050 32.7 31.4 104 31.5 29.0 109 South Brush Creek 8440 .2 9.2 2 15.3 17.8 86 Tower 10500 44.4 50.0 89 50.1 44.7 112 Webber Springs 9250 23.1 21.7 106 36.8 29.9 123 Willow Creek Pass 9540 19.2 14.2 135 20.4 15.8 129 Zirkel 9340 24.7 21.0 118 46.4 31.0 150 ----- ----- Basin Index (%) 97 114 SWEETWATER Deer Park 9700 37.2 16.0 232 43.1 23.4 184 Larsen Creek 9000 13.4 9.2 146 26.0 -M * South Pass 9040 34.5 14.9 232 33.6 20.3 166 ----- ----- Basin Index (%) 212 176 LOWER N. PLATTE Casper Mtn. 7900 12.9 13.3 97 18.4 17.9 103 Laprele Creek 8375 6.5 6.1 107 14.8 15.0 99 Reno Hill 8400 13.1 12.6 104 18.0 18.9 95 Windy Peak 7900 4.0 4.0 100 13.9 13.0 107 ----- ----- Basin Index (%) 101 100 LARAMIE RIVER Brooklyn Lake 10240 20.9 23.3 90 26.1 24.7 106 Cinnabar Park 9574 14.2 19.4 73 26.3 26.9 98 Crow Creek 8330 .0 .0 * 12.0 13.4 90 Deadman Hill 10220 22.2 19.0 117 24.4 20.6 118 Rawah 9020 5.8 6.1 95 20.3 17.2 118 Roach 9700 16.5 17.2 96 24.8 22.2 112 ----- ----- Basin Index (%) 94 107 S. PLATTE Black Mountain 8920 8.6 -M * 16.2 -M * Crow Creek 8330 .0 .0 * 12.0 13.4 90 Deadman Hill 10220 22.2 19.0 117 24.4 20.6 118 ----- ----- Basin Index (%) 117* 107 LITTLE SNAKE RIVER Battle Mountain 7440 .0 .0 * 19.5 17.1 114 Divide Peak 8880 12.3 18.0 68 25.9 24.3 107 Elk River 8700 5.9 13.2 45 23.3 22.7 103 Little Snake River 8915 23.5 22.3 105 43.0 32.7 131 Old Battle 10000 40.2 34.7 116 42.7 39.2 109 Sage Creek Basin 7850 -M 1.1 * 17.9 16.1 111 Sandstone RS 8150 .0 5.9 0 18.6 20.8 89 Whiskey Park 8950 24.7 26.5 93 34.9 31.5 111 ----- ----- Basin Index (%) 88 110 UPPER GREEN RIVER Big Sandy Opening 9080 22.9 10.6 216 25.7 15.1 170 Blind Bull Sum 8650 -M 23.1 * 38.9 21.3 183 East Rim Divide 7930 10.9 8.2 133 22.5 12.9 174 Elkhart Park G.S. 9400 20.9 11.3 185 26.3 15.0 175 Gros Ventre Summit 8750 21.2 11.6 183 26.4 14.6 181 Gunsight Pass 9820 -M 12.5 * 28.2 16.0 176 Kendall R.S. 7740 15.1 4.3 351 30.7 15.5 198 Loomis Park 8240 24.6 11.0 224 34.3 18.9 181 New Fork Lake 8340 12.7 6.5 195 19.4 12.1 160 Pocket Creek 9360 -M -M * -M -M * Snider Basin 8060 15.5 9.4 165 29.2 15.6 187 Spring Creek Divide 9000 44.5 24.3 183 44.3 26.2 169 Triple Peak 8500 36.9 17.5 211 44.5 27.9 159 ----- ----- Basin Index (%) 196 175 LOWER GREEN RIVER Blacks Fork Jct 8869 5.6 -M * 18.7 -M * Buck Pasture 9632 16.8 -M * 27.3 -M * EF Blacks Fork GS 9360 13.2 -M * 21.4 -M * Hams Fork 7840 10.2 2.9 352 23.8 13.1 182 Hewinta 9500 8.3 4.8 173 20.9 16.1 130 Hickerson Park 9122 4.7 4.2 112 15.1 12.0 126 Hole-in-Rock 9168 5.7 2.5 228 15.7 11.4 138 Indian Creek 9425 44.4 23.0 193 45.0 25.0 180 Kelley R.S. 8180 24.4 11.5 212 33.7 20.2 167 Spirit Lk 10235 15.9 -M * 20.9 -M * Steel Creek Park 10158 22.6 17.1 132 25.2 19.1 132 ----- ----- Basin Index (%) 182 153 UPPER BEAR RIVER Bear River RS 8777 1.7 -M * 21.4 -M * Bug Lake 7987 33.6 15.1 223 37.7 21.7 174 Burts Miller Ranch 8000 .0 -M * 11.9 -M * Chalk Creek #1 9171 34.5 24.2 143 41.0 28.4 144 Hayden Fork 9130 15.7 9.3 169 33.7 23.8 142 Kelley R.S. 8180 24.4 11.5 212 33.7 20.2 167 Lily Lake 9133 13.2 9.9 133 23.0 19.5 118 Monte Cristo 8932 38.7 26.5 146 44.5 29.2 152 Salt River Summit 7760 18.1 7.9 229 -M 18.4 * ----- ----- Basin Index (%) 171 150 ----------------------------------------------------------------------------- -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.