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: APRIL 24 , 2017 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7030 20.3 11.0 185 40.8 22.0 185 Black Bear 8170 48.7 36.9 132 57.0 40.5 141 Blind Bull Sum 8650 45.0 24.3 185 37.4 20.6 182 Cottonwood Creek 7670 27.0 17.5 154 40.6 26.3 154 East Rim Divide 7930 10.2 9.2 111 21.6 12.4 174 Grand Targhee 9260 52.2 42.9 122 46.2 33.2 139 Granite Creek 6770 21.7 9.8 221 37.0 20.5 180 Grassy Lake 7265 37.3 30.4 123 57.9 38.0 152 Gros Ventre Summit 8750 20.3 12.7 160 25.3 14.0 181 Gunsight Pass 9820 24.3 13.6 179 26.3 15.3 172 Lewis Lake Divide 7850 46.7 30.7 152 57.7 37.4 154 Phillips Bench 8200 39.0 25.3 154 48.3 29.6 163 Salt River Summit 7760 16.9 8.7 194 30.3 17.7 171 Snake River Station 6920 13.5 10.5 129 37.4 23.9 156 Spring Creek Divide 9000 42.1 23.6 178 41.9 25.3 166 Thumb Divide 7980 19.4 14.2 137 29.3 20.1 146 Togwotee Pass 9580 35.0 24.4 143 40.8 26.1 156 Two Ocean Plateau 9240 -M 28.8 * -M 29.0 * Willow Creek 8380 27.7 26.1 106 53.1 36.1 147 Younts Peak 8350 24.0 15.1 159 32.4 16.9 192 ----- ----- Basin Index (%) 148 160 MADISON-GALLATIN Black Bear 8170 48.7 36.9 132 57.0 40.5 141 Canyon 7870 17.2 11.8 146 26.8 17.3 155 Madison Plateau 7750 28.7 22.7 126 38.5 27.9 138 West Yellowstone 6700 .0 5.6 0 24.6 15.4 160 Whiskey Creek 6800 12.3 15.4 80 28.2 21.6 131 ----- ----- Basin Index (%) 116 143 YELLOWSTONE Beartooth Lake 9360 34.6 23.6 147 29.8 21.1 141 Burnt Mtn 5880 .1 .0 * 15.5 14.8 105 Canyon 7870 17.2 11.8 146 26.8 17.3 155 Cole Creek 7850 12.3 16.3 75 10.1 15.1 67 Evening Star 9200 40.1 24.4 164 47.1 29.3 161 Fisher Creek 9100 46.1 33.1 139 50.2 34.0 148 Northeast Entrance 7350 3.3 5.4 61 21.9 13.2 166 Parker Peak 9400 39.8 21.6 184 37.4 19.2 195 Sylvan Lake 8420 25.3 20.3 125 39.9 24.1 166 Thumb Divide 7980 19.4 14.2 137 29.3 20.1 146 Two Ocean Plateau 9240 -M 28.8 * -M 29.0 * White Mill 8700 39.4 23.8 166 38.1 25.3 151 Wolverine 7650 2.8 5.8 48 22.3 13.1 170 ----- ----- Basin Index (%) 140 149 WIND RIVER Burroughs Creek 8750 20.1 -M * 28.3 -M * Castle Creek 8400 8.1 -M * 16.9 -M * Cold Springs 9630 15.1 3.4 444 20.8 11.5 181 Deer Park 9700 34.3 16.3 210 40.6 22.4 181 Hobbs Park 10100 31.7 15.5 205 31.1 15.5 201 Kirwin 9550 24.1 10.1 239 27.3 12.9 212 Little Warm 9370 18.5 9.7 191 25.8 14.3 180 Owl Creek 8975 8.4 3.0 280 14.3 7.2 199 South Pass 9040 31.8 15.3 208 30.6 19.2 159 St. Lawrence Alt 8620 7.8 5.1 153 18.6 10.5 177 Togwotee Pass 9580 35.0 24.4 143 40.8 26.1 156 Townsend Creek 8700 17.5 8.9 197 25.0 13.9 180 ----- ----- Basin Index (%) 201 179 BIGHORN BASIN Bald Mtn. 9380 21.3 20.2 105 18.9 18.6 102 Bear Trap Meadow 8200 4.8 2.2 218 11.9 9.8 121 Bone Springs Div 9350 21.4 16.4 130 19.5 17.2 113 Grave Springs 8550 8.4 9.3 90 10.4 12.1 86 Kirwin 9550 24.1 10.1 239 27.3 12.9 212 Marquette 8760 15.4 -M * 19.7 -M * Middle Powder 7760 10.1 12.3 82 10.1 13.2 77 Owl Creek 8975 8.4 3.0 280 14.3 7.2 199 Powder River Pass 9480 10.0 10.3 97 15.7 14.1 111 Shell Creek 9580 19.2 15.8 122 16.8 15.2 111 Timber Creek 7950 6.7 3.9 172 13.0 8.8 148 ----- ----- Basin Index (%) 130 122 SHOSHONE RIVER Blackwater 9780 40.2 24.3 165 44.5 22.3 200 Evening Star 9200 40.1 24.4 164 47.1 29.3 161 Marquette 8760 15.4 -M * 19.7 -M * Sylvan Road 7120 .0 8.6 0 31.7 17.9 177 Younts Peak 8350 24.0 15.1 159 32.4 16.9 192 ----- ----- Basin Index (%) 144 180 POWDER RIVER Bear Trap Meadow 8200 4.8 2.2 218 11.9 9.8 121 Cloud Peak Reservoir 9860 17.9 16.2 110 22.6 15.4 147 Grave Springs 8550 8.4 9.3 90 10.4 12.1 86 Hansen Sawmill 8360 12.0 4.4 273 17.5 10.0 175 Middle Powder 7760 10.1 12.3 82 10.1 13.2 77 Powder River Pass 9480 10.0 10.3 97 15.7 14.1 111 Soldier Park 8720 15.2 -M * 17.2 -M * ----- ----- Basin Index (%) 116 118 TONGUE RIVER Big Goose 7990 12.0 9.1 132 16.2 13.2 123 Bone Springs Div 9350 21.4 16.4 130 19.5 17.2 113 Burgess Junction 7880 10.9 12.5 87 13.1 13.9 94 Dome Lake 8880 16.8 11.8 142 18.5 15.3 121 Little Goose 8870 14.8 -M * 19.9 -M * Sucker Creek 8880 13.4 12.7 106 15.5 16.2 96 Tie Creek 6870 .1 3.8 3 14.8 13.4 110 ----- ----- Basin Index (%) 113 109 BELLE FOURCHE Cole Canyon 5910 .0 1.1 0 9.0 10.8 83 ----- ----- Basin Index (%) 0 83 CHEYENNE RIVER BASIN Blind Park 6890 .0 3.8 0 10.5 13.5 78 North Rapid Creek 6130 .0 3.8 0 8.9 11.5 77 ----- ----- Basin Index (%) 0 78 UPPER N. PLATTE Arapaho Ridge 10960 24.4 21.6 113 27.6 25.2 110 Blackhall Mtn 9820 34.5 -M * 39.3 -M * Columbine 9160 10.7 20.7 52 28.9 27.5 105 Divide Peak 8880 10.6 18.2 58 23.9 23.3 103 Joe Wright 10120 17.0 23.0 74 30.5 28.5 107 Laprele Creek 8375 6.2 7.3 85 13.9 14.2 98 Med Bow 10500 36.3 -M * 37.1 -M * North French Creek 10130 24.6 32.4 76 29.8 29.3 102 Never Summer 10280 23.3 20.9 111 21.0 -M * Old Battle 10000 37.0 33.8 109 39.7 37.7 105 Rawah 9020 4.7 8.0 59 18.9 16.4 115 Sage Creek Basin 7850 -M 3.5 * 17.1 15.5 110 Sand Lake 10050 30.8 30.9 100 29.3 27.6 106 South Brush Creek 8440 .6 9.9 6 14.0 16.9 83 Tower 10500 40.4 49.1 82 46.0 43.1 107 Webber Springs 9250 21.6 21.9 99 34.4 28.9 119 Willow Creek Pass 9540 18.0 13.6 132 19.4 14.9 130 Zirkel 9340 22.9 22.5 102 43.6 30.2 144 ----- ----- Basin Index (%) 88 110 SWEETWATER Deer Park 9700 34.3 16.3 210 40.6 22.4 181 Larsen Creek 9000 12.8 9.9 129 24.8 -M * South Pass 9040 31.8 15.3 208 30.6 19.2 159 ----- ----- Basin Index (%) 190 171 LOWER N. PLATTE Casper Mtn. 7900 9.8 14.2 69 14.9 17.0 88 Laprele Creek 8375 6.2 7.3 85 13.9 14.2 98 Reno Hill 8400 11.9 13.9 86 16.5 17.8 93 Windy Peak 7900 4.1 6.2 66 13.1 12.2 107 ----- ----- Basin Index (%) 77 95 LARAMIE RIVER Brooklyn Lake 10240 19.6 22.7 86 24.3 23.5 103 Cinnabar Park 9574 12.3 19.9 62 23.5 26.0 90 Crow Creek 8330 .5 .0 * 11.0 12.6 87 Deadman Hill 10220 20.2 17.9 113 22.4 19.6 114 Rawah 9020 4.7 8.0 59 18.9 16.4 115 Roach 9700 14.4 16.7 86 22.4 21.3 105 ----- ----- Basin Index (%) 84 103 S. PLATTE Black Mountain 8920 7.8 -M * 14.6 -M * Crow Creek 8330 .5 .0 * 11.0 12.6 87 Deadman Hill 10220 20.2 17.9 113 22.4 19.6 114 ----- ----- Basin Index (%) 116* 104 LITTLE SNAKE RIVER Battle Mountain 7440 .0 2.4 0 18.0 16.4 110 Divide Peak 8880 10.6 18.2 58 23.9 23.3 103 Elk River 8700 4.2 14.7 29 21.2 21.8 97 Little Snake River 8915 21.3 23.5 91 40.5 31.5 129 Old Battle 10000 37.0 33.8 109 39.7 37.7 105 Sage Creek Basin 7850 -M 3.5 * 17.1 15.5 110 Sandstone RS 8150 -M 9.2 * 16.7 20.0 84 Whiskey Park 8950 22.2 25.6 87 32.0 30.3 106 ----- ----- Basin Index (%) 81 106 UPPER GREEN RIVER Big Sandy Opening 9080 21.8 12.2 179 24.8 14.5 171 Blind Bull Sum 8650 45.0 24.3 185 37.4 20.6 182 East Rim Divide 7930 10.2 9.2 111 21.6 12.4 174 Elkhart Park G.S. 9400 19.8 11.8 168 25.2 14.3 176 Gros Ventre Summit 8750 20.3 12.7 160 25.3 14.0 181 Gunsight Pass 9820 24.3 13.6 179 26.3 15.3 172 Kendall R.S. 7740 15.2 7.0 217 29.8 14.9 200 Loomis Park 8240 23.5 12.1 194 33.1 18.2 182 New Fork Lake 8340 12.2 7.7 158 18.9 11.5 164 Pocket Creek 9360 -M -M * -M -M * Snider Basin 8060 16.0 10.2 157 28.2 15.1 187 Spring Creek Divide 9000 42.1 23.6 178 41.9 25.3 166 Triple Peak 8500 34.8 19.1 182 42.5 26.8 159 ----- ----- Basin Index (%) 174 175 LOWER GREEN RIVER Blacks Fork Jct 8869 4.4 -M * 17.5 -M * Buck Pasture 9632 15.2 -M * 25.2 -M * EF Blacks Fork GS 9360 11.2 -M * 19.3 -M * Hams Fork 7840 10.0 5.3 189 22.6 12.4 182 Hewinta 9500 6.0 7.2 83 19.2 15.4 125 Hickerson Park 9122 4.1 5.1 80 13.9 11.5 121 Hole-in-Rock 9168 4.6 5.3 87 14.7 10.9 135 Indian Creek 9425 41.2 23.6 175 42.8 24.1 178 Kelley R.S. 8180 -M 11.9 * -M 19.3 * Spirit Lk 10235 14.6 -M * 19.8 -M * Steel Creek Park 10158 20.4 16.5 124 23.2 18.2 127 ----- ----- Basin Index (%) 137 147 UPPER BEAR RIVER Bear River RS 8777 -M -M * -M -M * Bug Lake 7987 31.5 16.2 194 35.7 20.8 172 Burts Miller Ranch 8000 .0 -M * 11.2 -M * Chalk Creek #1 9171 32.3 24.6 131 38.5 27.3 141 Hayden Fork 9130 13.4 10.9 123 31.7 22.8 139 Kelley R.S. 8180 -M 11.9 * -M 19.3 * Lily Lake 9133 11.4 10.0 114 21.6 18.7 116 Monte Cristo 8932 36.3 27.3 133 41.8 28.0 149 Salt River Summit 7760 16.9 8.7 194 30.3 17.7 171 ----- ----- Basin Index (%) 145 148 ----------------------------------------------------------------------------- -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.