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: MAY 7 , 2017 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7030 16.0 6.1 262 42.2 23.4 180 Black Bear 8170 50.1 37.0 135 59.8 42.6 140 Blind Bull Sum 8650 -M 22.6 * 39.1 21.9 179 Cottonwood Creek 7670 26.6 13.5 197 44.1 28.3 156 East Rim Divide 7930 4.1 6.9 59 22.6 13.3 170 Grand Targhee 9260 58.4 46.4 126 51.4 35.7 144 Granite Creek 6770 16.7 6.7 249 38.4 21.9 175 Grassy Lake 7265 35.3 27.0 131 61.5 40.1 153 Gros Ventre Summit 8750 19.1 10.2 187 26.5 15.1 175 Gunsight Pass 9820 24.8 11.7 212 28.2 16.5 171 Lewis Lake Divide 7850 44.5 29.4 151 59.8 39.3 152 Phillips Bench 8200 39.5 23.6 167 50.8 31.4 162 Salt River Summit 7760 13.4 6.2 216 31.9 18.8 170 Snake River Station 6920 8.3 4.0 208 39.3 25.3 155 Spring Creek Divide 9000 45.0 24.1 187 44.6 26.8 166 Thumb Divide 7980 15.3 9.7 158 30.5 21.5 142 Togwotee Pass 9580 35.9 25.0 144 43.1 28.1 153 Two Ocean Plateau 9240 -M 29.8 * -M 30.8 * Willow Creek 8380 25.8 21.7 119 57.6 38.6 149 Younts Peak 8350 18.2 15.6 117 33.7 18.3 184 ----- ----- Basin Index (%) 153 159 MADISON-GALLATIN Black Bear 8170 50.1 37.0 135 59.8 42.6 140 Canyon 7870 15.5 8.2 189 28.9 18.5 156 Madison Plateau 7750 26.4 20.7 128 40.0 29.6 135 West Yellowstone 6700 .0 .0 * 26.0 16.4 159 Whiskey Creek 6800 9.8 11.9 82 29.9 22.8 131 ----- ----- Basin Index (%) 131 142 YELLOWSTONE Beartooth Lake 9360 35.6 22.9 155 31.8 22.7 140 Burnt Mtn 5880 .0 .0 * 18.4 16.6 111 Canyon 7870 15.5 8.2 189 28.9 18.5 156 Cole Creek 7850 16.8 16.9 99 14.3 17.2 83 Evening Star 9200 37.9 25.1 151 49.3 31.3 158 Fisher Creek 9100 46.8 33.4 140 52.7 36.1 146 Northeast Entrance 7350 .0 1.0 0 23.1 14.3 162 Parker Peak 9400 41.8 21.6 194 40.1 20.7 194 Sylvan Lake 8420 25.1 18.4 136 42.0 25.9 162 Thumb Divide 7980 15.3 9.7 158 30.5 21.5 142 Two Ocean Plateau 9240 -M 29.8 * -M 30.8 * White Mill 8700 40.3 24.3 166 40.0 27.0 148 Wolverine 7650 -M .5 * 23.8 14.2 168 ----- ----- Basin Index (%) 152 148 WIND RIVER Burroughs Creek 8750 16.0 -M * 29.3 -M * Castle Creek 8400 2.8 -M * 17.3 -M * Cold Springs 9630 12.7 1.6 794 22.5 13.1 172 Deer Park 9700 35.2 14.7 239 43.4 24.2 179 Hobbs Park 10100 34.9 15.9 219 34.5 17.4 198 Kirwin 9550 23.8 10.8 220 29.3 14.5 202 Little Warm 9370 17.2 7.1 242 27.2 15.9 171 Owl Creek 8975 4.2 .5 840* 15.3 8.4 182 South Pass 9040 32.7 13.1 250 33.8 21.0 161 St. Lawrence Alt 8620 6.2 1.5 413 20.6 12.1 170 Togwotee Pass 9580 35.9 25.0 144 43.1 28.1 153 Townsend Creek 8700 17.7 5.2 340 28.2 15.5 182 ----- ----- Basin Index (%) 231 175 BIGHORN BASIN Bald Mtn. 9380 22.8 20.4 112 21.5 20.4 105 Bear Trap Meadow 8200 3.9 .2 1950* 14.9 11.3 132 Bone Springs Div 9350 22.7 16.4 138 21.7 19.0 114 Grave Springs 8550 10.1 8.5 119 13.7 13.6 101 Kirwin 9550 23.8 10.8 220 29.3 14.5 202 Marquette 8760 18.9 -M * 23.8 -M * Middle Powder 7760 11.8 11.2 105 14.2 14.8 96 Owl Creek 8975 4.2 .5 840* 15.3 8.4 182 Powder River Pass 9480 9.8 9.0 109 18.2 15.8 115 Shell Creek 9580 18.5 16.4 113 18.5 17.0 109 Timber Creek 7950 4.5 1.9 237 15.0 10.6 142 ----- ----- Basin Index (%) 139 125 SHOSHONE RIVER Blackwater 9780 41.5 25.5 163 46.4 24.2 192 Evening Star 9200 37.9 25.1 151 49.3 31.3 158 Marquette 8760 18.9 -M * 23.8 -M * Sylvan Road 7120 .0 2.9 0 32.3 19.0 170 Younts Peak 8350 18.2 15.6 117 33.7 18.3 184 ----- ----- Basin Index (%) 141 174 POWDER RIVER Bear Trap Meadow 8200 3.9 .2 1950* 14.9 11.3 132 Cloud Peak Reservoir 9860 20.5 16.5 124 26.5 17.5 151 Grave Springs 8550 10.1 8.5 119 13.7 13.6 101 Hansen Sawmill 8360 13.2 1.5 880 18.9 11.4 166 Middle Powder 7760 11.8 11.2 105 14.2 14.8 96 Powder River Pass 9480 9.8 9.0 109 18.2 15.8 115 Soldier Park 8720 15.6 -M * 20.5 -M * ----- ----- Basin Index (%) 148 126 TONGUE RIVER Big Goose 7990 13.4 10.1 133 20.1 15.1 133 Bone Springs Div 9350 22.7 16.4 138 21.7 19.0 114 Burgess Junction 7880 12.0 11.4 105 15.9 15.5 103 Dome Lake 8880 18.6 11.2 166 22.0 17.2 128 Little Goose 8870 16.9 -M * 24.0 -M * Sucker Creek 8880 14.4 12.1 119 19.1 18.3 104 Tie Creek 6870 1.7 2.1 81 19.7 15.1 130 ----- ----- Basin Index (%) 131 118 BELLE FOURCHE Cole Canyon 5910 .0 .0 * 12.3 12.9 95 ----- ----- Basin Index (%) * 95 CHEYENNE RIVER BASIN Blind Park 6890 .0 .0 * 11.6 14.9 78 North Rapid Creek 6130 .0 .0 * 10.0 12.9 78 ----- ----- Basin Index (%) * 78 UPPER N. PLATTE Arapaho Ridge 10960 25.1 22.3 113 29.8 26.9 111 Blackhall Mtn 9820 35.9 -M * -M -M * Columbine 9160 9.7 15.1 64 32.2 29.3 110 Divide Peak 8880 9.2 16.3 56 26.1 25.0 104 Joe Wright 10120 18.0 22.9 79 33.4 30.8 108 Laprele Creek 8375 2.4 4.6 52 15.6 15.6 100 Med Bow 10500 38.7 -M * 41.2 -M * North French Creek 10130 27.2 32.8 83 34.1 31.6 108 Never Summer 10280 24.5 22.0 111 22.7 -M * Old Battle 10000 39.4 35.8 110 43.3 40.2 108 Rawah 9020 2.8 3.8 74 20.7 17.8 116 Sage Creek Basin 7850 -M .2 * 17.9 16.6 108 Sand Lake 10050 33.2 31.8 104 32.3 29.9 108 South Brush Creek 8440 .6 6.7 9 16.7 18.5 90 Tower 10500 44.5 51.3 87 51.1 45.9 111 Webber Springs 9250 22.1 20.5 108 37.0 30.6 121 Willow Creek Pass 9540 18.1 14.3 127 20.6 16.2 127 Zirkel 9340 22.0 20.2 109 46.8 31.8 147 ----- ----- Basin Index (%) 93 113 SWEETWATER Deer Park 9700 35.2 14.7 239 43.4 24.2 179 Larsen Creek 9000 8.3 7.4 112 26.0 -M * South Pass 9040 32.7 13.1 250 33.8 21.0 161 ----- ----- Basin Index (%) 216 171 LOWER N. PLATTE Casper Mtn. 7900 11.0 11.9 92 18.8 18.9 99 Laprele Creek 8375 2.4 4.6 52 15.6 15.6 100 Reno Hill 8400 11.2 11.8 95 19.1 19.7 97 Windy Peak 7900 .7 2.0 35 14.1 13.5 104 ----- ----- Basin Index (%) 83 100 LARAMIE RIVER Brooklyn Lake 10240 19.8 22.2 89 26.8 25.5 105 Cinnabar Park 9574 12.9 18.1 71 26.8 27.9 96 Crow Creek 8330 .0 .0 * 12.3 14.1 87 Deadman Hill 10220 21.3 18.9 113 24.9 21.3 117 Rawah 9020 2.8 3.8 74 20.7 17.8 116 Roach 9700 15.2 16.6 92 25.3 23.0 110 ----- ----- Basin Index (%) 90 106 S. PLATTE Black Mountain 8920 4.8 -M * 16.4 -M * Crow Creek 8330 .0 .0 * 12.3 14.1 87 Deadman Hill 10220 21.3 18.9 113 24.9 21.3 117 ----- ----- Basin Index (%) 113* 105 LITTLE SNAKE RIVER Battle Mountain 7440 .0 .0 * 19.5 17.5 111 Divide Peak 8880 9.2 16.3 56 26.1 25.0 104 Elk River 8700 1.2 10.1 12 23.1 23.4 99 Little Snake River 8915 21.2 21.0 101 43.6 33.7 129 Old Battle 10000 39.4 35.8 110 43.3 40.2 108 Sage Creek Basin 7850 -M .2 * 17.9 16.6 108 Sandstone RS 8150 -M 3.2 * 19.4 21.3 91 Whiskey Park 8950 23.3 27.1 86 35.3 32.3 109 ----- ----- Basin Index (%) 85 109 UPPER GREEN RIVER Big Sandy Opening 9080 20.0 8.7 230 25.7 15.8 163 Blind Bull Sum 8650 -M 22.6 * 39.1 21.9 179 East Rim Divide 7930 4.1 6.9 59 22.6 13.3 170 Elkhart Park G.S. 9400 18.8 10.0 188 26.3 15.6 169 Gros Ventre Summit 8750 19.1 10.2 187 26.5 15.1 175 Gunsight Pass 9820 24.8 11.7 212 28.2 16.5 171 Kendall R.S. 7740 9.9 .7 1414* 30.6 15.9 192 Loomis Park 8240 20.2 8.4 240 34.6 19.5 177 New Fork Lake 8340 8.0 4.0 200 19.9 12.6 158 Pocket Creek 9360 -M -M * -M -M * Snider Basin 8060 -M 7.9 * 29.3 16.0 183 Spring Creek Divide 9000 45.0 24.1 187 44.6 26.8 166 Triple Peak 8500 33.9 15.4 220 44.9 28.7 156 ----- ----- Basin Index (%) 204 171 LOWER GREEN RIVER Blacks Fork Jct 8869 .9 -M * 18.8 -M * Buck Pasture 9632 13.7 -M * 27.3 -M * EF Blacks Fork GS 9360 8.9 -M * 21.7 -M * Hams Fork 7840 4.4 .5 880* 23.9 13.5 177 Hewinta 9500 3.4 3.4 100 21.0 16.8 125 Hickerson Park 9122 .3 1.8 17 14.9 12.5 119 Hole-in-Rock 9168 .0 1.0 0 15.7 12.0 131 Indian Creek 9425 41.5 21.3 195 45.1 25.6 176 Kelley R.S. 8180 17.6 9.2 191 33.7 20.7 163 Spirit Lk 10235 13.1 -M * 21.0 -M * Steel Creek Park 10158 21.0 17.6 119 25.3 19.8 128 ----- ----- Basin Index (%) 161 149 UPPER BEAR RIVER Bear River RS 8777 .0 -M * 21.3 -M * Bug Lake 7987 30.0 12.8 234 37.7 22.3 169 Burts Miller Ranch 8000 .0 -M * 12.0 -M * Chalk Creek #1 9171 33.0 22.5 147 41.1 29.3 140 Hayden Fork 9130 9.2 7.1 130 33.2 24.5 136 Kelley R.S. 8180 17.6 9.2 191 33.7 20.7 163 Lily Lake 9133 8.8 7.8 113 23.0 20.2 114 Monte Cristo 8932 36.9 23.3 158 44.7 30.1 149 Salt River Summit 7760 13.4 6.2 216 31.9 18.8 170 ----- ----- Basin Index (%) 167 148 ----------------------------------------------------------------------------- -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.