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 FRIDAY: MARCH 17 , 2017 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7030 26.4 14.4 183 36.8 18.8 196 Black Bear 8170 42.9 32.2 133 48.7 33.9 144 Blind Bull Sum 8650 40.4 20.2 200 -M 17.4 * Cottonwood Creek 7670 26.6 19.3 138 34.4 21.5 160 East Rim Divide 7930 18.4 9.5 194 19.8 10.4 190 Grand Targhee 9260 39.9 32.7 122 -M 26.7 * Granite Creek 6770 29.7 14.9 199 34.2 17.9 191 Grassy Lake 7265 35.9 28.9 124 49.6 32.2 154 Gros Ventre Summit 8750 17.3 11.3 153 22.0 11.2 196 Gunsight Pass 9820 19.9 11.9 167 22.1 12.0 184 Lewis Lake Divide 7850 38.4 27.4 140 50.2 31.6 159 Phillips Bench 8200 35.1 22.0 160 43.8 24.9 176 Salt River Summit 7760 20.3 11.8 172 -M 14.7 * Snake River Station 6920 20.8 15.2 137 32.7 20.1 163 Spring Creek Divide 9000 36.6 20.5 179 37.1 21.1 176 Thumb Divide 7980 22.0 13.8 159 25.5 16.2 157 Togwotee Pass 9580 30.7 20.3 151 34.9 21.4 163 Two Ocean Plateau 9240 -M 23.7 * -M 24.0 * Willow Creek 8380 29.9 25.2 119 45.0 29.4 153 Younts Peak 8350 27.1 13.1 207 28.9 13.9 208 ----- ----- Basin Index (%) 153 168 MADISON-GALLATIN Black Bear 8170 42.9 32.2 133 48.7 33.9 144 Canyon 7870 17.3 11.7 148 23.8 14.3 166 Madison Plateau 7750 25.4 19.9 128 32.6 23.3 140 West Yellowstone 6700 11.6 9.9 117 21.2 12.6 168 Whiskey Creek 6800 14.9 13.8 108 24.2 17.9 135 ----- ----- Basin Index (%) 128 148 YELLOWSTONE Beartooth Lake 9360 29.8 18.8 159 25.2 17.4 145 Burnt Mtn 5880 4.6 4.4 105 12.0 10.6 113 Canyon 7870 17.3 11.7 148 23.8 14.3 166 Cole Creek 7850 9.4 11.7 80 6.6 10.3 64 Evening Star 9200 35.4 21.8 162 41.1 24.0 171 Fisher Creek 9100 39.8 28.0 142 42.8 28.1 152 Northeast Entrance 7350 11.6 8.8 132 18.5 10.8 171 Parker Peak 9400 30.5 17.3 176 -M 15.4 * Sylvan Lake 8420 22.5 17.8 126 34.0 19.6 173 Thumb Divide 7980 22.0 13.8 159 25.5 16.2 157 Two Ocean Plateau 9240 -M 23.7 * -M 24.0 * White Mill 8700 31.7 19.6 162 32.5 20.9 156 Wolverine 7650 14.3 8.8 162 19.6 10.8 181 ----- ----- Basin Index (%) 147 154 WIND RIVER Burroughs Creek 8750 24.8 -M * 25.3 -M * Castle Creek 8400 12.0 -M * 14.2 -M * Cold Springs 9630 12.0 6.2 194 14.9 8.3 180 Deer Park 9700 27.6 12.6 219 32.1 16.8 191 Hobbs Park 10100 22.4 11.4 196 20.4 10.8 189 Kirwin 9550 18.2 8.3 219 20.9 9.7 215 Little Warm 9370 15.6 9.1 171 21.3 10.9 195 Owl Creek 8975 6.8 4.5 151 8.7 4.8 181 South Pass 9040 26.0 13.2 197 23.7 15.0 158 St. Lawrence Alt 8620 6.6 5.9 112 12.0 7.3 164 Togwotee Pass 9580 30.7 20.3 151 34.9 21.4 163 Townsend Creek 8700 12.2 7.9 154 15.9 9.8 162 ----- ----- Basin Index (%) 179 178 BIGHORN BASIN Bald Mtn. 9380 16.8 16.3 103 14.5 14.5 100 Bear Trap Meadow 8200 5.1 4.9 104 6.1 6.8 90 Bone Springs Div 9350 15.4 13.8 112 14.6 13.1 111 Grave Springs 8550 5.9 7.9 75 6.1 8.7 70 Kirwin 9550 18.2 8.3 219 20.9 9.7 215 Marquette 8760 7.3 -M * 11.6 -M * Middle Powder 7760 6.3 9.3 68 6.2 9.7 64 Owl Creek 8975 6.8 4.5 151 8.7 4.8 181 Powder River Pass 9480 7.0 8.9 79 10.3 10.6 97 Shell Creek 9580 14.3 12.6 113 11.6 11.6 100 Timber Creek 7950 5.3 4.2 126 6.9 5.9 117 ----- ----- Basin Index (%) 111 111 SHOSHONE RIVER Blackwater 9780 34.7 20.2 172 38.5 17.8 216 Evening Star 9200 35.4 21.8 162 41.1 24.0 171 Marquette 8760 7.3 -M * 11.6 -M * Sylvan Road 7120 15.1 10.3 147 28.4 14.9 191 Younts Peak 8350 27.1 13.1 207 28.9 13.9 208 ----- ----- Basin Index (%) 172 194 POWDER RIVER Bear Trap Meadow 8200 5.1 4.9 104 6.1 6.8 90 Cloud Peak Reservoir 9860 11.7 12.5 94 12.8 10.8 119 Grave Springs 8550 5.9 7.9 75 6.1 8.7 70 Hansen Sawmill 8360 7.2 5.5 131 9.2 6.9 133 Middle Powder 7760 6.3 9.3 68 6.2 9.7 64 Powder River Pass 9480 7.0 8.9 79 10.3 10.6 97 Soldier Park 8720 11.7 -M * 9.1 -M * ----- ----- Basin Index (%) 88 95 TONGUE RIVER Big Goose 7990 8.2 7.5 109 9.3 8.8 106 Bone Springs Div 9350 15.4 13.8 112 14.6 13.1 111 Burgess Junction 7880 8.3 9.4 88 9.0 10.1 89 Dome Lake 8880 12.4 9.9 125 12.0 11.1 108 Little Goose 8870 9.1 -M * 11.5 -M * Sucker Creek 8880 10.0 10.6 94 9.8 11.8 83 Tie Creek 6870 4.3 4.8 90 9.7 9.5 102 ----- ----- Basin Index (%) 105 100 BELLE FOURCHE Cole Canyon 5910 2.7 5.4 50 6.3 7.8 81 ----- ----- Basin Index (%) 50 81 CHEYENNE RIVER BASIN Blind Park 6890 4.0 7.2 56 7.8 10.3 76 North Rapid Creek 6130 4.6 6.4 72 6.4 8.4 76 ----- ----- Basin Index (%) 63 76 UPPER N. PLATTE Arapaho Ridge 10960 23.6 18.0 131 23.6 19.1 124 Blackhall Mtn 9820 34.6 -M * 34.8 -M * Columbine 9160 24.0 21.7 111 25.8 22.5 115 Divide Peak 8880 18.1 17.4 104 21.0 18.6 113 Joe Wright 10120 17.9 18.8 95 25.7 22.3 115 Laprele Creek 8375 11.1 9.0 123 10.4 10.5 99 Med Bow 10500 36.6 -M * 32.4 -M * North French Creek 10130 24.1 24.3 99 25.1 23.2 108 Never Summer 10280 21.3 17.5 122 17.3 -M * Old Battle 10000 35.3 26.1 135 36.3 30.8 118 Rawah 9020 11.4 9.2 124 15.1 11.7 129 Sage Creek Basin 7850 12.9 11.7 110 15.2 12.8 119 Sand Lake 10050 28.1 23.9 118 25.5 21.1 121 South Brush Creek 8440 9.2 11.1 83 11.6 13.0 89 Tower 10500 39.2 39.3 100 41.6 35.1 119 Webber Springs 9250 27.8 20.8 134 31.5 23.3 135 Willow Creek Pass 9540 16.3 10.7 152 17.1 11.5 149 Zirkel 9340 39.1 25.7 152 40.2 25.0 161 ----- ----- Basin Index (%) 118 122 SWEETWATER Deer Park 9700 27.6 12.6 219 32.1 16.8 191 Larsen Creek 9000 -M 10.9 * 21.0 -M * South Pass 9040 26.0 13.2 197 23.7 15.0 158 ----- ----- Basin Index (%) 208 175 LOWER N. PLATTE Casper Mtn. 7900 10.7 11.9 90 10.4 12.4 84 Laprele Creek 8375 11.1 9.0 123 10.4 10.5 99 Reno Hill 8400 11.0 11.7 94 11.7 12.5 94 Windy Peak 7900 9.5 6.8 140 10.0 8.8 114 ----- ----- Basin Index (%) 107 96 LARAMIE RIVER Brooklyn Lake 10240 24.1 17.5 138 21.7 18.0 121 Cinnabar Park 9574 18.1 17.8 102 20.8 21.1 99 Crow Creek 8330 4.7 7.1 66 8.1 8.7 93 Deadman Hill 10220 19.3 13.6 142 18.2 14.5 126 Rawah 9020 11.4 9.2 124 15.1 11.7 129 Roach 9700 15.3 13.7 112 18.4 16.5 112 ----- ----- Basin Index (%) 118 113 S. PLATTE Black Mountain 8920 9.3 -M * 10.5 -M * Crow Creek 8330 4.7 7.1 66 8.1 8.7 93 Deadman Hill 10220 19.3 13.6 142 18.2 14.5 126 ----- ----- Basin Index (%) 116 113 LITTLE SNAKE RIVER Battle Mountain 7440 8.5 11.1 77 15.6 13.3 117 Divide Peak 8880 18.1 17.4 104 21.0 18.6 113 Elk River 8700 18.5 17.3 107 19.1 17.6 109 Little Snake River 8915 29.8 20.7 144 36.7 26.2 140 Old Battle 10000 35.3 26.1 135 36.3 30.8 118 Sage Creek Basin 7850 12.9 11.7 110 15.2 12.8 119 Sandstone RS 8150 11.7 11.7 100 15.3 16.4 93 Whiskey Park 8950 26.7 24.0 111 28.3 24.5 116 ----- ----- Basin Index (%) 115 117 UPPER GREEN RIVER Big Sandy Opening 9080 19.9 11.3 176 21.7 11.6 187 Blind Bull Sum 8650 40.4 20.2 200 -M 17.4 * East Rim Divide 7930 18.4 9.5 194 19.8 10.4 190 Elkhart Park G.S. 9400 17.8 10.5 170 22.1 11.6 191 Gros Ventre Summit 8750 17.3 11.3 153 22.0 11.2 196 Gunsight Pass 9820 19.9 11.9 167 22.1 12.0 184 Kendall R.S. 7740 22.9 11.0 208 27.6 12.8 216 Loomis Park 8240 26.6 13.1 203 30.5 15.3 199 New Fork Lake 8340 16.0 9.2 174 16.5 9.6 172 Pocket Creek 9360 -M -M * -M -M * Snider Basin 8060 18.9 10.9 173 25.5 12.6 202 Spring Creek Divide 9000 36.6 20.5 179 37.1 21.1 176 Triple Peak 8500 34.8 19.2 181 37.6 22.3 169 ----- ----- Basin Index (%) 183 188 LOWER GREEN RIVER Blacks Fork Jct 8869 9.5 -M * 13.6 -M * Buck Pasture 9632 17.8 -M * 20.7 -M * EF Blacks Fork GS 9360 15.3 -M * 14.2 -M * Hams Fork 7840 16.1 10.2 158 18.3 10.0 183 Hewinta 9500 9.3 9.4 99 14.3 12.0 119 Hickerson Park 9122 7.1 6.6 108 8.4 8.6 98 Hole-in-Rock 9168 5.8 6.4 91 9.1 8.1 112 Indian Creek 9425 36.9 20.9 177 -M 19.7 * Kelley R.S. 8180 24.9 13.1 190 28.4 15.9 179 Spirit Lk 10235 13.4 -M * 14.7 -M * Steel Creek Park 10158 15.3 13.2 116 17.1 14.0 122 ----- ----- Basin Index (%) 145 139 UPPER BEAR RIVER Bear River RS 8777 10.5 -M * 15.4 -M * Bug Lake 7987 29.9 16.5 181 30.0 17.1 175 Burts Miller Ranch 8000 5.9 -M * 8.5 -M * Chalk Creek #1 9171 31.0 20.6 150 32.0 21.7 147 Hayden Fork 9130 21.2 14.1 150 26.7 18.2 147 Kelley R.S. 8180 24.9 13.1 190 28.4 15.9 179 Lily Lake 9133 13.6 11.4 119 17.0 14.7 116 Monte Cristo 8932 33.5 23.9 140 32.4 22.7 143 Salt River Summit 7760 20.3 11.8 172 -M 14.7 * ----- ----- Basin Index (%) 157 151 ----------------------------------------------------------------------------- -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.