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 9 , 2017 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7030 23.9 15.1 158 39.6 20.8 190 Black Bear 8170 46.1 36.9 125 53.7 38.0 141 Blind Bull Sum 8650 43.8 23.4 187 -M 19.4 * Cottonwood Creek 7670 28.2 20.9 135 38.7 24.5 158 East Rim Divide 7930 15.6 10.2 153 21.2 11.7 181 Grand Targhee 9260 46.3 39.0 119 39.5 30.8 128 Granite Creek 6770 25.7 14.1 182 36.1 19.6 184 Grassy Lake 7265 37.1 31.4 118 55.0 35.8 154 Gros Ventre Summit 8750 -M 12.8 * -M 12.9 * Gunsight Pass 9820 23.7 13.9 171 25.4 13.9 183 Lewis Lake Divide 7850 46.2 30.1 153 55.4 35.2 157 Phillips Bench 8200 38.3 25.6 150 46.8 28.0 167 Salt River Summit 7760 20.0 12.6 159 -M 16.6 * Snake River Station 6920 18.3 14.6 125 35.9 22.4 160 Spring Creek Divide 9000 41.6 22.6 184 40.9 23.7 173 Thumb Divide 7980 22.5 14.7 153 28.0 18.5 151 Togwotee Pass 9580 33.8 22.3 152 38.8 24.2 160 Two Ocean Plateau 9240 -M 26.3 * -M 27.1 * Willow Creek 8380 29.4 28.3 104 50.1 33.5 150 Younts Peak 8350 25.8 14.5 178 31.2 15.7 199 ----- ----- Basin Index (%) 145 161 MADISON-GALLATIN Black Bear 8170 46.1 36.9 125 53.7 38.0 141 Canyon 7870 17.8 12.4 144 25.8 16.1 160 Madison Plateau 7750 27.3 21.7 126 36.2 26.2 138 West Yellowstone 6700 6.1 9.1 67 23.3 14.1 165 Whiskey Creek 6800 13.4 14.8 91 26.8 20.0 134 ----- ----- Basin Index (%) 117 145 YELLOWSTONE Beartooth Lake 9360 32.6 21.5 152 27.8 19.6 142 Burnt Mtn 5880 .1 4.0 2 14.7 13.1 112 Canyon 7870 17.8 12.4 144 25.8 16.1 160 Cole Creek 7850 11.7 14.9 79 8.9 13.1 68 Evening Star 9200 38.3 23.9 160 44.7 27.2 164 Fisher Creek 9100 43.0 31.3 137 46.7 31.4 149 Northeast Entrance 7350 7.5 8.8 85 20.5 12.2 168 Parker Peak 9400 35.4 19.7 180 34.4 17.6 195 Sylvan Lake 8420 24.1 19.5 124 37.4 22.2 168 Thumb Divide 7980 22.5 14.7 153 28.0 18.5 151 Two Ocean Plateau 9240 -M 26.3 * -M 27.1 * White Mill 8700 36.3 22.5 161 35.8 23.6 152 Wolverine 7650 5.4 9.6 56 21.0 12.2 172 ----- ----- Basin Index (%) 135 152 WIND RIVER Burroughs Creek 8750 23.2 -M * 27.6 -M * Castle Creek 8400 10.8 -M * 15.8 -M * Cold Springs 9630 17.8 6.5 274 20.2 10.0 202 Deer Park 9700 33.5 16.0 209 38.4 20.0 192 Hobbs Park 10100 30.3 14.3 212 28.1 13.6 207 Kirwin 9550 22.9 9.6 239 25.4 11.6 219 Little Warm 9370 -M 10.3 * 25.1 12.9 195 Owl Creek 8975 10.1 5.8 174 12.8 6.1 210 South Pass 9040 -M 15.5 * 28.8 17.5 165 St. Lawrence Alt 8620 10.4 6.9 151 17.4 9.0 193 Togwotee Pass 9580 33.8 22.3 152 38.8 24.2 160 Townsend Creek 8700 18.7 9.8 191 23.2 12.2 190 ----- ----- Basin Index (%) 195 188 BIGHORN BASIN Bald Mtn. 9380 20.0 19.2 104 17.0 17.0 100 Bear Trap Meadow 8200 5.1 4.8 106 9.0 8.7 103 Bone Springs Div 9350 20.1 17.0 118 18.1 15.6 116 Grave Springs 8550 7.0 9.5 74 7.9 10.7 74 Kirwin 9550 22.9 9.6 239 25.4 11.6 219 Marquette 8760 14.2 -M * 17.7 -M * Middle Powder 7760 7.5 12.2 61 7.7 11.8 65 Owl Creek 8975 10.1 5.8 174 12.8 6.1 210 Powder River Pass 9480 9.2 10.3 89 13.6 12.7 107 Shell Creek 9580 17.7 15.3 116 14.7 13.8 107 Timber Creek 7950 8.0 5.1 157 11.7 7.4 158 ----- ----- Basin Index (%) 117 119 SHOSHONE RIVER Blackwater 9780 38.2 22.8 168 42.2 20.5 206 Evening Star 9200 38.3 23.9 160 44.7 27.2 164 Marquette 8760 14.2 -M * 17.7 -M * Sylvan Road 7120 6.2 10.6 58 30.6 16.6 184 Younts Peak 8350 25.8 14.5 178 31.2 15.7 199 ----- ----- Basin Index (%) 151 186 POWDER RIVER Bear Trap Meadow 8200 5.1 4.8 106 9.0 8.7 103 Cloud Peak Reservoir 9860 16.4 15.0 109 18.4 13.5 136 Grave Springs 8550 7.0 9.5 74 7.9 10.7 74 Hansen Sawmill 8360 11.4 6.1 187 14.4 8.7 166 Middle Powder 7760 7.5 12.2 61 7.7 11.8 65 Powder River Pass 9480 9.2 10.3 89 13.6 12.7 107 Soldier Park 8720 14.9 -M * 14.3 -M * ----- ----- Basin Index (%) 98 107 TONGUE RIVER Big Goose 7990 11.8 9.8 120 14.2 11.7 121 Bone Springs Div 9350 20.1 17.0 118 18.1 15.6 116 Burgess Junction 7880 10.7 12.0 89 12.0 12.4 97 Dome Lake 8880 16.6 11.8 141 16.8 13.8 122 Little Goose 8870 13.8 -M * 17.3 -M * Sucker Creek 8880 13.5 12.4 109 14.0 14.5 97 Tie Creek 6870 3.4 5.5 62 13.9 11.9 117 ----- ----- Basin Index (%) 111 111 BELLE FOURCHE Cole Canyon 5910 .0 4.6 0 7.3 9.6 76 ----- ----- Basin Index (%) 0 76 CHEYENNE RIVER BASIN Blind Park 6890 .0 6.8 0 9.1 12.0 76 North Rapid Creek 6130 .0 6.4 0 7.7 10.0 77 ----- ----- Basin Index (%) 0 76 UPPER N. PLATTE Arapaho Ridge 10960 25.1 21.1 119 26.2 22.8 115 Blackhall Mtn 9820 35.9 -M * 37.6 -M * Columbine 9160 17.0 23.3 73 27.3 25.6 107 Divide Peak 8880 15.4 20.1 77 22.6 21.5 105 Joe Wright 10120 18.5 21.5 86 28.7 25.9 111 Laprele Creek 8375 9.9 9.4 105 12.5 12.6 99 Med Bow 10500 38.8 -M * 35.0 -M * North French Creek 10130 24.7 30.0 82 27.3 26.9 101 Never Summer 10280 21.0 20.4 103 19.5 -M * Old Battle 10000 36.1 31.6 114 38.1 35.2 108 Rawah 9020 8.8 10.6 83 17.3 14.6 118 Sage Creek Basin 7850 5.3 11.4 46 16.5 14.7 112 Sand Lake 10050 30.7 29.3 105 27.5 25.0 110 South Brush Creek 8440 2.6 11.8 22 12.6 15.3 82 Tower 10500 38.8 46.3 84 43.3 40.0 108 Webber Springs 9250 25.5 23.2 110 33.4 26.8 125 Willow Creek Pass 9540 18.0 12.3 146 18.6 13.5 138 Zirkel 9340 30.9 26.1 118 41.9 28.6 147 ----- ----- Basin Index (%) 94 113 SWEETWATER Deer Park 9700 33.5 16.0 209 38.4 20.0 192 Larsen Creek 9000 16.5 11.4 145 23.5 -M * South Pass 9040 -M 15.5 * 28.8 17.5 165 ----- ----- Basin Index (%) 182 179 LOWER N. PLATTE Casper Mtn. 7900 10.9 14.4 76 13.0 15.2 86 Laprele Creek 8375 9.9 9.4 105 12.5 12.6 99 Reno Hill 8400 12.1 14.1 86 14.2 15.7 90 Windy Peak 7900 7.8 7.6 103 11.8 10.6 111 ----- ----- Basin Index (%) 89 95 LARAMIE RIVER Brooklyn Lake 10240 22.9 22.1 104 23.1 21.2 109 Cinnabar Park 9574 16.8 21.4 79 22.3 24.3 92 Crow Creek 8330 .0 6.8 0 9.3 11.0 85 Deadman Hill 10220 21.4 16.3 131 20.7 17.4 119 Rawah 9020 8.8 10.6 83 17.3 14.6 118 Roach 9700 16.6 16.6 100 21.4 19.3 111 ----- ----- Basin Index (%) 92 106 S. PLATTE Black Mountain 8920 10.8 -M * 13.2 -M * Crow Creek 8330 .0 6.8 0 9.3 11.0 85 Deadman Hill 10220 21.4 16.3 131 20.7 17.4 119 ----- ----- Basin Index (%) 93 106 LITTLE SNAKE RIVER Battle Mountain 7440 -M 9.0 * 16.7 15.1 111 Divide Peak 8880 15.4 20.1 77 22.6 21.5 105 Elk River 8700 11.7 18.9 62 20.2 20.1 100 Little Snake River 8915 25.7 25.8 100 38.6 30.1 128 Old Battle 10000 36.1 31.6 114 38.1 35.2 108 Sage Creek Basin 7850 5.3 11.4 46 16.5 14.7 112 Sandstone RS 8150 5.4 12.7 43 16.2 18.4 88 Whiskey Park 8950 25.1 27.6 91 29.9 28.1 106 ----- ----- Basin Index (%) 84 109 UPPER GREEN RIVER Big Sandy Opening 9080 21.4 12.8 167 23.3 13.3 175 Blind Bull Sum 8650 43.8 23.4 187 -M 19.4 * East Rim Divide 7930 15.6 10.2 153 21.2 11.7 181 Elkhart Park G.S. 9400 19.9 12.3 162 24.6 13.3 185 Gros Ventre Summit 8750 -M 12.8 * -M 12.9 * Gunsight Pass 9820 23.7 13.9 171 25.4 13.9 183 Kendall R.S. 7740 20.0 11.2 179 29.4 14.1 209 Loomis Park 8240 26.8 13.8 194 32.2 17.3 186 New Fork Lake 8340 15.6 10.2 153 17.9 10.8 166 Pocket Creek 9360 -M -M * -M -M * Snider Basin 8060 18.8 12.3 153 27.6 14.1 196 Spring Creek Divide 9000 41.6 22.6 184 40.9 23.7 173 Triple Peak 8500 36.5 21.6 169 41.2 25.2 163 ----- ----- Basin Index (%) 173 180 LOWER GREEN RIVER Blacks Fork Jct 8869 8.7 -M * 16.3 -M * Buck Pasture 9632 17.7 -M * 23.9 -M * EF Blacks Fork GS 9360 14.8 -M * 17.7 -M * Hams Fork 7840 14.0 10.3 136 21.8 11.4 191 Hewinta 9500 8.9 10.8 82 17.8 14.1 126 Hickerson Park 9122 9.3 7.9 118 13.3 10.3 129 Hole-in-Rock 9168 7.6 7.1 107 13.9 9.8 142 Indian Creek 9425 41.1 24.8 166 41.5 22.5 184 Kelley R.S. 8180 25.6 14.5 177 30.9 18.1 171 Spirit Lk 10235 17.0 -M * 19.2 -M * Steel Creek Park 10158 19.5 15.9 123 21.5 16.6 130 ----- ----- Basin Index (%) 138 156 UPPER BEAR RIVER Bear River RS 8777 8.6 -M * 19.0 -M * Bug Lake 7987 32.9 18.7 176 34.7 19.4 179 Burts Miller Ranch 8000 2.3 -M * 10.5 -M * Chalk Creek #1 9171 34.1 24.5 139 36.7 25.3 145 Hayden Fork 9130 19.4 15.2 128 30.2 21.2 142 Kelley R.S. 8180 25.6 14.5 177 30.9 18.1 171 Lily Lake 9133 13.9 12.8 109 20.4 17.3 118 Monte Cristo 8932 37.3 27.8 134 40.3 26.0 155 Salt River Summit 7760 20.0 12.6 159 -M 16.6 * ----- ----- Basin Index (%) 145 152 ----------------------------------------------------------------------------- -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.