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 WEDNESDAY: MAY 3 , 2017 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7030 19.8 8.4 236 42.2 22.9 184 Black Bear 8170 50.4 37.3 135 59.8 42.0 142 Blind Bull Sum 8650 48.5 22.9 212 39.0 21.5 181 Cottonwood Creek 7670 29.4 14.7 200 44.0 27.7 159 East Rim Divide 7930 9.6 7.9 122 22.5 13.0 173 Grand Targhee 9260 58.1 45.5 128 51.1 34.9 146 Granite Creek 6770 20.8 7.8 267 38.2 21.5 178 Grassy Lake 7265 39.9 28.3 141 61.5 39.5 156 Gros Ventre Summit 8750 20.8 11.3 184 26.5 14.7 180 Gunsight Pass 9820 26.0 12.1 215 28.2 16.2 174 Lewis Lake Divide 7850 48.4 29.7 163 59.8 38.8 154 Phillips Bench 8200 41.5 24.8 167 50.8 30.9 164 Salt River Summit 7760 17.5 7.6 230 31.9 18.5 172 Snake River Station 6920 13.6 6.2 219 39.3 24.9 158 Spring Creek Divide 9000 44.7 24.3 184 44.6 26.4 169 Thumb Divide 7980 19.7 11.3 174 30.5 21.1 145 Togwotee Pass 9580 37.0 24.7 150 43.1 27.5 157 Two Ocean Plateau 9240 -M 29.9 * -M 30.3 * Willow Creek 8380 28.7 22.3 129 57.6 37.9 152 Younts Peak 8350 22.6 15.7 144 33.7 17.8 189 ----- ----- Basin Index (%) 165 162 MADISON-GALLATIN Black Bear 8170 50.4 37.3 135 59.8 42.0 142 Canyon 7870 18.4 9.6 192 28.8 18.1 159 Madison Plateau 7750 30.0 21.0 143 40.0 29.1 137 West Yellowstone 6700 .0 .6 0* 26.0 16.0 162 Whiskey Creek 6800 12.3 13.8 89 29.8 22.5 132 ----- ----- Basin Index (%) 135 144 YELLOWSTONE Beartooth Lake 9360 36.4 22.7 160 31.5 22.1 143 Burnt Mtn 5880 .0 .0 * 18.5 16.1 115 Canyon 7870 18.4 9.6 192 28.8 18.1 159 Cole Creek 7850 17.3 16.7 104 14.2 16.6 86 Evening Star 9200 41.7 24.8 168 49.2 30.6 161 Fisher Creek 9100 48.3 32.6 148 52.5 35.4 148 Northeast Entrance 7350 2.1 2.0 105 23.1 13.9 166 Parker Peak 9400 42.9 21.2 202 40.0 20.2 198 Sylvan Lake 8420 26.9 19.3 139 42.0 25.3 166 Thumb Divide 7980 19.7 11.3 174 30.5 21.1 145 Two Ocean Plateau 9240 -M 29.9 * -M 30.3 * White Mill 8700 40.6 23.9 170 40.0 26.5 151 Wolverine 7650 2.5 1.4 179 23.7 13.9 171 ----- ----- Basin Index (%) 160 152 WIND RIVER Burroughs Creek 8750 19.8 -M * 29.2 -M * Castle Creek 8400 6.7 -M * 17.4 -M * Cold Springs 9630 16.0 1.3 1231 22.3 12.6 177 Deer Park 9700 36.9 15.7 235 43.4 23.6 184 Hobbs Park 10100 34.9 16.0 218 34.4 16.9 204 Kirwin 9550 25.7 10.6 242 29.1 14.0 208 Little Warm 9370 19.3 8.4 230 27.2 15.5 175 Owl Creek 8975 8.5 .7 1214 15.3 8.1 189 South Pass 9040 34.2 14.4 238 33.6 20.5 164 St. Lawrence Alt 8620 9.3 2.1 443 20.5 11.7 175 Togwotee Pass 9580 37.0 24.7 150 43.1 27.5 157 Townsend Creek 8700 19.7 6.9 286 28.1 15.1 186 ----- ----- Basin Index (%) 240 179 BIGHORN BASIN Bald Mtn. 9380 24.7 20.5 120 21.3 19.9 107 Bear Trap Meadow 8200 7.0 .6 1167 14.8 10.8 137 Bone Springs Div 9350 23.8 16.4 145 21.5 18.4 117 Grave Springs 8550 11.4 9.4 121 13.5 13.0 104 Kirwin 9550 25.7 10.6 242 29.1 14.0 208 Marquette 8760 20.4 -M * 23.7 -M * Middle Powder 7760 13.7 11.4 120 14.1 14.3 99 Owl Creek 8975 8.5 .7 1214 15.3 8.1 189 Powder River Pass 9480 12.1 9.1 133 18.0 15.2 118 Shell Creek 9580 20.5 16.0 128 18.2 16.5 110 Timber Creek 7950 7.8 2.7 289 15.1 10.2 148 ----- ----- Basin Index (%) 159 129 SHOSHONE RIVER Blackwater 9780 42.2 25.7 164 46.4 23.7 196 Evening Star 9200 41.7 24.8 168 49.2 30.6 161 Marquette 8760 20.4 -M * 23.7 -M * Sylvan Road 7120 .0 4.6 0 32.5 18.7 174 Younts Peak 8350 22.6 15.7 144 33.7 17.8 189 ----- ----- Basin Index (%) 150 178 POWDER RIVER Bear Trap Meadow 8200 7.0 .6 1167 14.8 10.8 137 Cloud Peak Reservoir 9860 22.0 16.4 134 26.2 16.9 155 Grave Springs 8550 11.4 9.4 121 13.5 13.0 104 Hansen Sawmill 8360 15.6 1.8 867 18.9 11.0 172 Middle Powder 7760 13.7 11.4 120 14.1 14.3 99 Powder River Pass 9480 12.1 9.1 133 18.0 15.2 118 Soldier Park 8720 18.2 -M * 20.4 -M * ----- ----- Basin Index (%) 168 130 TONGUE RIVER Big Goose 7990 15.4 9.3 166 19.7 14.3 138 Bone Springs Div 9350 23.8 16.4 145 21.5 18.4 117 Burgess Junction 7880 13.5 11.8 114 15.8 15.0 105 Dome Lake 8880 19.8 11.3 175 21.8 16.6 131 Little Goose 8870 19.2 -M * 24.0 -M * Sucker Creek 8880 16.5 12.0 138 18.8 17.6 107 Tie Creek 6870 4.7 2.5 188 19.7 14.6 135 ----- ----- Basin Index (%) 148 122 BELLE FOURCHE Cole Canyon 5910 1.4 .1 1400* 11.8 12.3 96 ----- ----- Basin Index (%) 1400* 96 CHEYENNE RIVER BASIN Blind Park 6890 .3 .2 150* 11.6 14.6 79 North Rapid Creek 6130 .1 .5 20* 9.9 12.6 79 ----- ----- Basin Index (%) 57* 79 UPPER N. PLATTE Arapaho Ridge 10960 26.9 22.3 121 29.8 26.4 113 Blackhall Mtn 9820 37.1 -M * 42.0 -M * Columbine 9160 12.9 17.5 74 32.0 28.8 111 Divide Peak 8880 12.3 17.8 69 26.0 24.6 106 Joe Wright 10120 19.3 22.9 84 33.2 30.2 110 Laprele Creek 8375 6.3 5.6 112 14.9 15.2 98 Med Bow 10500 40.6 -M * 41.1 -M * North French Creek 10130 28.9 32.8 88 34.0 31.1 109 Never Summer 10280 25.2 21.8 116 22.7 -M * Old Battle 10000 40.5 34.7 117 42.9 39.5 109 Rawah 9020 5.9 5.2 113 20.5 17.5 117 Sage Creek Basin 7850 -M 1.0 * 18.1 16.3 111 Sand Lake 10050 33.4 31.5 106 32.1 29.3 110 South Brush Creek 8440 .4 8.4 5 15.5 18.1 86 Tower 10500 44.5 50.4 88 50.7 45.1 112 Webber Springs 9250 23.1 21.3 108 37.0 30.2 123 Willow Creek Pass 9540 19.2 14.5 132 20.5 16.0 128 Zirkel 9340 24.7 20.8 119 46.8 31.2 150 ----- ----- Basin Index (%) 99 114 SWEETWATER Deer Park 9700 36.9 15.7 235 43.4 23.6 184 Larsen Creek 9000 12.8 8.6 149 26.0 -M * South Pass 9040 34.2 14.4 238 33.6 20.5 164 ----- ----- Basin Index (%) 217 175 LOWER N. PLATTE Casper Mtn. 7900 13.0 12.8 102 18.6 18.3 102 Laprele Creek 8375 6.3 5.6 112 14.9 15.2 98 Reno Hill 8400 13.5 12.2 111 18.4 19.2 96 Windy Peak 7900 3.9 3.4 115 14.0 13.2 106 ----- ----- Basin Index (%) 108 100 LARAMIE RIVER Brooklyn Lake 10240 21.5 23.1 93 26.4 25.0 106 Cinnabar Park 9574 14.6 19.0 77 26.9 27.3 99 Crow Creek 8330 .0 .0 * 12.3 13.6 90 Deadman Hill 10220 22.6 19.2 118 24.8 20.9 119 Rawah 9020 5.9 5.2 113 20.5 17.5 117 Roach 9700 16.8 17.1 98 25.2 22.5 112 ----- ----- Basin Index (%) 97 107 S. PLATTE Black Mountain 8920 8.3 -M * 16.4 -M * Crow Creek 8330 .0 .0 * 12.3 13.6 90 Deadman Hill 10220 22.6 19.2 118 24.8 20.9 119 ----- ----- Basin Index (%) 118* 108 LITTLE SNAKE RIVER Battle Mountain 7440 .0 .0 * 19.6 17.3 113 Divide Peak 8880 12.3 17.8 69 26.0 24.6 106 Elk River 8700 6.0 12.5 48 23.4 23.0 102 Little Snake River 8915 23.8 21.8 109 43.4 33.1 131 Old Battle 10000 40.5 34.7 117 42.9 39.5 109 Sage Creek Basin 7850 -M 1.0 * 18.1 16.3 111 Sandstone RS 8150 -M 5.1 * 18.8 21.0 90 Whiskey Park 8950 24.7 26.8 92 35.3 31.8 111 ----- ----- Basin Index (%) 94 110 UPPER GREEN RIVER Big Sandy Opening 9080 22.6 9.8 231 25.7 15.3 168 Blind Bull Sum 8650 48.5 22.9 212 39.0 21.5 181 East Rim Divide 7930 9.6 7.9 122 22.5 13.0 173 Elkhart Park G.S. 9400 20.7 10.8 192 26.3 15.2 173 Gros Ventre Summit 8750 20.8 11.3 184 26.5 14.7 180 Gunsight Pass 9820 26.0 12.1 215 28.2 16.2 174 Kendall R.S. 7740 13.6 3.2 425 30.6 15.6 196 Loomis Park 8240 23.7 10.5 226 34.3 19.1 180 New Fork Lake 8340 11.8 6.0 197 19.5 12.3 159 Pocket Creek 9360 -M -M * -M -M * Snider Basin 8060 13.9 8.9 156 29.2 15.7 186 Spring Creek Divide 9000 44.7 24.3 184 44.6 26.4 169 Triple Peak 8500 36.4 16.7 218 44.8 28.1 159 ----- ----- Basin Index (%) 202 174 LOWER GREEN RIVER Blacks Fork Jct 8869 5.2 -M * 18.8 -M * Buck Pasture 9632 16.7 -M * 27.3 -M * EF Blacks Fork GS 9360 12.8 -M * 21.5 -M * Hams Fork 7840 9.4 2.0 470 23.8 13.2 180 Hewinta 9500 7.9 4.4 180 20.9 16.4 127 Hickerson Park 9122 3.5 3.5 100 14.9 12.2 122 Hole-in-Rock 9168 4.5 2.0 225 15.6 11.6 134 Indian Creek 9425 44.6 22.5 198 45.0 25.2 179 Kelley R.S. 8180 24.2 10.8 224 33.7 20.3 166 Spirit Lk 10235 16.0 -M * 20.9 -M * Steel Creek Park 10158 22.5 17.4 129 25.2 19.3 131 ----- ----- Basin Index (%) 186 152 UPPER BEAR RIVER Bear River RS 8777 .8 -M * 21.4 -M * Bug Lake 7987 32.3 14.2 227 37.6 21.8 172 Burts Miller Ranch 8000 .0 -M * 11.9 -M * Chalk Creek #1 9171 34.5 23.8 145 41.1 28.7 143 Hayden Fork 9130 14.9 8.8 169 33.5 24.0 140 Kelley R.S. 8180 24.2 10.8 224 33.7 20.3 166 Lily Lake 9133 12.8 9.9 129 23.1 19.8 117 Monte Cristo 8932 39.0 25.8 151 44.6 29.5 151 Salt River Summit 7760 17.5 7.6 230 31.9 18.5 172 ----- ----- Basin Index (%) 174 151 ----------------------------------------------------------------------------- -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.