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: MARCH 20 , 2017 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7030 -M 14.7 * 37.4 19.0 197 Black Bear 8170 43.8 32.5 135 49.3 34.5 143 Blind Bull Sum 8650 40.8 20.5 199 -M 17.6 * Cottonwood Creek 7670 25.6 19.9 129 34.5 21.9 158 East Rim Divide 7930 18.0 9.6 188 19.9 10.6 188 Grand Targhee 9260 40.9 33.0 124 37.3 27.1 138 Granite Creek 6770 29.1 15.0 194 34.4 18.2 189 Grassy Lake 7265 36.7 29.4 125 50.6 32.7 155 Gros Ventre Summit 8750 17.4 11.6 150 22.0 11.5 191 Gunsight Pass 9820 19.8 12.1 164 22.3 12.1 184 Lewis Lake Divide 7850 39.4 27.7 142 51.2 32.1 160 Phillips Bench 8200 -M 22.4 * 44.1 25.3 174 Salt River Summit 7760 19.8 12.0 165 26.8 15.0 179 Snake River Station 6920 19.6 15.2 129 33.4 20.4 164 Spring Creek Divide 9000 36.7 21.1 174 37.1 21.5 173 Thumb Divide 7980 21.7 14.1 154 26.1 16.5 158 Togwotee Pass 9580 30.7 20.6 149 35.3 21.8 162 Two Ocean Plateau 9240 -M 24.0 * -M 24.4 * Willow Creek 8380 30.0 25.4 118 45.5 29.9 152 Younts Peak 8350 27.6 13.4 206 29.3 14.1 208 ----- ----- Basin Index (%) 149 166 MADISON-GALLATIN Black Bear 8170 43.8 32.5 135 49.3 34.5 143 Canyon 7870 16.8 11.8 142 23.9 14.6 164 Madison Plateau 7750 25.9 20.1 129 33.3 23.7 141 West Yellowstone 6700 10.7 9.9 108 21.6 12.8 169 Whiskey Creek 6800 14.2 14.2 100 24.3 18.2 134 ----- ----- Basin Index (%) 126 147 YELLOWSTONE Beartooth Lake 9360 30.1 19.3 156 25.5 17.7 144 Burnt Mtn 5880 2.6 4.6 57 12.0 10.9 110 Canyon 7870 16.8 11.8 142 23.9 14.6 164 Cole Creek 7850 9.3 12.0 78 6.6 10.7 62 Evening Star 9200 36.0 22.2 162 41.6 24.4 170 Fisher Creek 9100 40.5 28.2 144 43.4 28.5 152 Northeast Entrance 7350 10.6 9.0 118 18.8 11.0 171 Parker Peak 9400 31.1 17.6 177 -M 15.7 * Sylvan Lake 8420 22.2 18.2 122 34.6 20.0 173 Thumb Divide 7980 21.7 14.1 154 26.1 16.5 158 Two Ocean Plateau 9240 -M 24.0 * -M 24.4 * White Mill 8700 32.1 19.9 161 32.9 21.2 155 Wolverine 7650 11.9 8.9 134 19.9 11.0 181 ----- ----- Basin Index (%) 143 153 WIND RIVER Burroughs Creek 8750 24.0 -M * 25.4 -M * Castle Creek 8400 11.3 -M * 14.3 -M * Cold Springs 9630 11.8 6.3 187 14.9 8.6 173 Deer Park 9700 27.1 13.3 204 32.2 17.2 187 Hobbs Park 10100 21.8 11.8 185 20.4 11.1 184 Kirwin 9550 18.6 8.4 221 21.1 10.0 211 Little Warm 9370 15.7 9.2 171 21.3 11.2 190 Owl Creek 8975 6.5 4.6 141 8.7 5.0 174 South Pass 9040 25.0 13.8 181 23.8 15.4 155 St. Lawrence Alt 8620 6.1 6.1 100 12.0 7.5 160 Togwotee Pass 9580 30.7 20.6 149 35.3 21.8 162 Townsend Creek 8700 12.1 8.2 148 16.0 10.1 158 ----- ----- Basin Index (%) 171 174 BIGHORN BASIN Bald Mtn. 9380 16.8 16.5 102 14.6 14.9 98 Bear Trap Meadow 8200 4.5 5.1 88 6.2 7.1 87 Bone Springs Div 9350 15.4 14.1 109 14.7 13.4 110 Grave Springs 8550 5.9 8.1 73 6.1 9.0 68 Kirwin 9550 18.6 8.4 221 21.1 10.0 211 Marquette 8760 7.1 -M * 11.7 -M * Middle Powder 7760 -M 9.8 * 6.2 10.0 62 Owl Creek 8975 6.5 4.6 141 8.7 5.0 174 Powder River Pass 9480 6.6 9.2 72 10.4 10.8 96 Shell Creek 9580 14.4 12.8 112 11.7 11.9 98 Timber Creek 7950 4.6 4.2 110 6.9 6.1 113 ----- ----- Basin Index (%) 112 109 SHOSHONE RIVER Blackwater 9780 35.2 20.8 169 39.0 18.1 215 Evening Star 9200 36.0 22.2 162 41.6 24.4 170 Marquette 8760 7.1 -M * 11.7 -M * Sylvan Road 7120 13.3 10.4 128 28.9 15.1 191 Younts Peak 8350 27.6 13.4 206 29.3 14.1 208 ----- ----- Basin Index (%) 168 194 POWDER RIVER Bear Trap Meadow 8200 4.5 5.1 88 6.2 7.1 87 Cloud Peak Reservoir 9860 11.7 12.9 91 13.0 11.2 116 Grave Springs 8550 5.9 8.1 73 6.1 9.0 68 Hansen Sawmill 8360 7.1 5.7 125 9.3 7.1 131 Middle Powder 7760 -M 9.8 * 6.2 10.0 62 Powder River Pass 9480 6.6 9.2 72 10.4 10.8 96 Soldier Park 8720 10.8 -M * 9.1 -M * ----- ----- Basin Index (%) 87 93 TONGUE RIVER Big Goose 7990 8.0 7.8 103 9.3 9.2 101 Bone Springs Div 9350 15.4 14.1 109 14.7 13.4 110 Burgess Junction 7880 7.9 9.5 83 9.1 10.5 87 Dome Lake 8880 12.2 10.2 120 12.0 11.5 104 Little Goose 8870 8.7 -M * 11.6 -M * Sucker Creek 8880 9.6 10.9 88 9.8 12.2 80 Tie Creek 6870 2.7 5.0 54 9.7 9.8 99 ----- ----- Basin Index (%) 97 97 BELLE FOURCHE Cole Canyon 5910 -M 5.5 * 6.4 7.9 81 ----- ----- Basin Index (%) * 81 CHEYENNE RIVER BASIN Blind Park 6890 2.4 7.2 33 7.7 10.5 73 North Rapid Creek 6130 -M 6.5 * 6.4 8.6 74 ----- ----- Basin Index (%) 33 74 UPPER N. PLATTE Arapaho Ridge 10960 23.4 18.0 130 23.5 19.7 119 Blackhall Mtn 9820 34.6 -M * 35.5 -M * Columbine 9160 22.4 22.0 102 26.0 22.9 114 Divide Peak 8880 17.0 17.6 97 20.9 19.1 109 Joe Wright 10120 17.0 19.1 89 25.7 22.9 112 Laprele Creek 8375 10.3 9.1 113 10.5 10.8 97 Med Bow 10500 37.3 -M * 32.4 -M * North French Creek 10130 23.3 25.2 92 25.2 23.7 106 Never Summer 10280 20.9 17.8 117 17.2 -M * Old Battle 10000 35.3 26.3 134 36.4 31.4 116 Rawah 9020 10.2 9.4 109 15.1 12.2 124 Sage Creek Basin 7850 10.8 11.5 94 15.2 12.9 118 Sand Lake 10050 28.2 24.6 115 25.5 21.7 118 South Brush Creek 8440 7.9 11.1 71 11.7 13.3 88 Tower 10500 39.1 40.0 98 41.7 35.8 116 Webber Springs 9250 26.4 21.0 126 31.5 23.9 132 Willow Creek Pass 9540 16.3 10.9 150 17.1 11.7 146 Zirkel 9340 37.7 25.7 147 40.2 25.5 158 ----- ----- Basin Index (%) 112 119 SWEETWATER Deer Park 9700 27.1 13.3 204 32.2 17.2 187 Larsen Creek 9000 16.8 11.2 150 21.0 -M * South Pass 9040 25.0 13.8 181 23.8 15.4 155 ----- ----- Basin Index (%) 180 172 LOWER N. PLATTE Casper Mtn. 7900 10.1 12.2 83 10.3 12.8 80 Laprele Creek 8375 10.3 9.1 113 10.5 10.8 97 Reno Hill 8400 10.7 11.9 90 11.8 13.0 91 Windy Peak 7900 8.8 7.1 124 10.1 9.1 111 ----- ----- Basin Index (%) 99 93 LARAMIE RIVER Brooklyn Lake 10240 24.3 17.7 137 21.7 18.5 117 Cinnabar Park 9574 17.3 18.0 96 20.8 21.4 97 Crow Creek 8330 3.5 6.9 51 8.2 8.9 92 Deadman Hill 10220 19.6 13.9 141 18.2 15.0 121 Rawah 9020 10.2 9.4 109 15.1 12.2 124 Roach 9700 15.1 14.0 108 18.4 16.9 109 ----- ----- Basin Index (%) 113 110 S. PLATTE Black Mountain 8920 9.2 -M * 10.5 -M * Crow Creek 8330 3.5 6.9 51 8.2 8.9 92 Deadman Hill 10220 19.6 13.9 141 18.2 15.0 121 ----- ----- Basin Index (%) 111 110 LITTLE SNAKE RIVER Battle Mountain 7440 6.6 11.4 58 15.7 13.6 115 Divide Peak 8880 17.0 17.6 97 20.9 19.1 109 Elk River 8700 16.2 17.4 93 19.1 18.0 106 Little Snake River 8915 28.1 21.1 133 36.8 26.5 139 Old Battle 10000 35.3 26.3 134 36.4 31.4 116 Sage Creek Basin 7850 10.8 11.5 94 15.2 12.9 118 Sandstone RS 8150 10.9 12.2 89 15.2 16.7 91 Whiskey Park 8950 25.7 24.3 106 28.3 25.0 113 ----- ----- Basin Index (%) 106 115 UPPER GREEN RIVER Big Sandy Opening 9080 19.7 11.7 168 21.6 11.8 183 Blind Bull Sum 8650 40.8 20.5 199 -M 17.6 * East Rim Divide 7930 18.0 9.6 188 19.9 10.6 188 Elkhart Park G.S. 9400 17.7 10.7 165 22.1 11.8 187 Gros Ventre Summit 8750 17.4 11.6 150 22.0 11.5 191 Gunsight Pass 9820 19.8 12.1 164 22.3 12.1 184 Kendall R.S. 7740 21.8 11.3 193 27.6 13.0 212 Loomis Park 8240 26.1 13.3 196 30.6 15.6 196 New Fork Lake 8340 15.8 9.3 170 16.7 9.7 172 Pocket Creek 9360 -M -M * -M -M * Snider Basin 8060 18.4 11.0 167 25.5 12.8 199 Spring Creek Divide 9000 36.7 21.1 174 37.1 21.5 173 Triple Peak 8500 34.8 19.5 178 37.7 22.7 166 ----- ----- Basin Index (%) 177 185 LOWER GREEN RIVER Blacks Fork Jct 8869 8.8 -M * 13.6 -M * Buck Pasture 9632 16.8 -M * 20.7 -M * EF Blacks Fork GS 9360 14.0 -M * 14.2 -M * Hams Fork 7840 14.6 10.3 142 18.6 10.2 182 Hewinta 9500 7.5 9.9 76 14.3 12.3 116 Hickerson Park 9122 6.5 6.6 98 8.4 8.9 94 Hole-in-Rock 9168 5.0 6.6 76 9.1 8.3 110 Indian Creek 9425 37.0 21.3 174 -M 20.2 * Kelley R.S. 8180 24.6 13.4 184 28.4 16.2 175 Spirit Lk 10235 12.6 -M * 14.7 -M * Steel Creek Park 10158 15.3 13.4 114 17.1 14.3 120 ----- ----- Basin Index (%) 136 137 UPPER BEAR RIVER Bear River RS 8777 9.0 -M * 15.4 -M * Bug Lake 7987 29.5 16.7 177 30.0 17.4 172 Burts Miller Ranch 8000 4.2 -M * 8.5 -M * Chalk Creek #1 9171 30.6 21.2 144 32.0 22.2 144 Hayden Fork 9130 18.7 14.3 131 26.7 18.6 144 Kelley R.S. 8180 24.6 13.4 184 28.4 16.2 175 Lily Lake 9133 11.5 11.4 101 17.0 15.0 113 Monte Cristo 8932 32.6 24.4 134 32.4 23.1 140 Salt River Summit 7760 19.8 12.0 165 26.8 15.0 179 ----- ----- Basin Index (%) 148 152 ----------------------------------------------------------------------------- -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.