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 TUESDAY: MARCH 21 , 2017 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7030 24.3 14.7 165 37.6 19.1 197 Black Bear 8170 44.2 32.7 135 49.6 34.7 143 Blind Bull Sum 8650 40.8 20.6 198 -M 17.7 * Cottonwood Creek 7670 25.3 20.1 126 34.5 22.0 157 East Rim Divide 7930 17.6 9.6 183 19.8 10.6 187 Grand Targhee 9260 41.1 33.1 124 37.5 27.2 138 Granite Creek 6770 29.0 14.9 195 34.5 18.2 190 Grassy Lake 7265 -M 29.4 * 50.7 32.8 155 Gros Ventre Summit 8750 -M 11.7 * -M 11.5 * Gunsight Pass 9820 19.8 12.1 164 22.4 12.2 184 Lewis Lake Divide 7850 40.0 27.9 143 51.7 32.2 161 Phillips Bench 8200 34.2 22.5 152 44.2 25.4 174 Salt River Summit 7760 19.5 12.1 161 26.9 15.0 179 Snake River Station 6920 19.6 15.3 128 33.4 20.5 163 Spring Creek Divide 9000 36.8 21.3 173 37.1 21.5 173 Thumb Divide 7980 22.2 14.2 156 26.4 16.6 159 Togwotee Pass 9580 30.9 20.7 149 35.5 21.8 163 Two Ocean Plateau 9240 -M 24.1 * -M 24.5 * Willow Creek 8380 29.6 25.4 117 45.5 30.1 151 Younts Peak 8350 26.6 13.5 197 29.7 14.2 209 ----- ----- Basin Index (%) 152 165 MADISON-GALLATIN Black Bear 8170 44.2 32.7 135 49.6 34.7 143 Canyon 7870 16.9 11.8 143 24.2 14.6 166 Madison Plateau 7750 25.7 20.1 128 33.5 23.8 141 West Yellowstone 6700 10.6 9.9 107 21.7 12.8 170 Whiskey Creek 6800 14.0 14.2 99 24.7 18.2 136 ----- ----- Basin Index (%) 126 148 YELLOWSTONE Beartooth Lake 9360 30.7 19.5 157 26.0 17.8 146 Burnt Mtn 5880 2.8 4.6 61 12.4 11.0 113 Canyon 7870 16.9 11.8 143 24.2 14.6 166 Cole Creek 7850 9.6 12.1 79 6.7 10.8 62 Evening Star 9200 36.4 22.4 162 41.7 24.6 170 Fisher Creek 9100 41.2 28.3 146 44.0 28.7 153 Northeast Entrance 7350 10.6 9.1 116 19.1 11.0 174 Parker Peak 9400 31.5 17.7 178 32.1 15.7 204 Sylvan Lake 8420 22.7 18.2 125 35.0 20.1 174 Thumb Divide 7980 22.2 14.2 156 26.4 16.6 159 Two Ocean Plateau 9240 -M 24.1 * -M 24.5 * White Mill 8700 32.8 20.0 164 33.6 21.3 158 Wolverine 7650 11.2 8.9 126 20.1 11.0 183 ----- ----- Basin Index (%) 144 158 WIND RIVER Burroughs Creek 8750 23.7 -M * 25.5 -M * Castle Creek 8400 11.4 -M * 14.5 -M * Cold Springs 9630 11.8 6.4 184 14.9 8.6 173 Deer Park 9700 27.0 13.5 200 32.2 17.3 186 Hobbs Park 10100 21.8 11.9 183 20.4 11.2 182 Kirwin 9550 19.0 8.4 226 21.3 10.0 213 Little Warm 9370 15.8 9.3 170 21.4 11.2 191 Owl Creek 8975 6.8 4.6 148 9.1 5.0 182 South Pass 9040 25.4 14.0 181 23.8 15.5 154 St. Lawrence Alt 8620 5.5 6.2 89 12.0 7.6 158 Togwotee Pass 9580 30.9 20.7 149 35.5 21.8 163 Townsend Creek 8700 11.8 8.3 142 15.9 10.2 156 ----- ----- Basin Index (%) 170 174 BIGHORN BASIN Bald Mtn. 9380 17.1 16.5 104 14.7 15.0 98 Bear Trap Meadow 8200 4.5 5.1 88 6.2 7.2 86 Bone Springs Div 9350 15.9 14.2 112 14.9 13.5 110 Grave Springs 8550 5.8 8.2 71 6.0 9.0 67 Kirwin 9550 19.0 8.4 226 21.3 10.0 213 Marquette 8760 7.2 -M * 11.6 -M * Middle Powder 7760 6.0 9.9 61 6.1 10.1 60 Owl Creek 8975 6.8 4.6 148 9.1 5.0 182 Powder River Pass 9480 6.9 9.2 75 10.5 10.9 96 Shell Creek 9580 14.8 12.9 115 11.8 11.9 99 Timber Creek 7950 4.5 4.2 107 7.0 6.2 113 ----- ----- Basin Index (%) 109 109 SHOSHONE RIVER Blackwater 9780 35.8 20.9 171 39.4 18.2 216 Evening Star 9200 36.4 22.4 162 41.7 24.6 170 Marquette 8760 7.2 -M * 11.6 -M * Sylvan Road 7120 13.1 10.5 125 29.4 15.2 193 Younts Peak 8350 26.6 13.5 197 29.7 14.2 209 ----- ----- Basin Index (%) 166 194 POWDER RIVER Bear Trap Meadow 8200 4.5 5.1 88 6.2 7.2 86 Cloud Peak Reservoir 9860 11.8 13.0 91 13.1 11.3 116 Grave Springs 8550 5.8 8.2 71 6.0 9.0 67 Hansen Sawmill 8360 7.4 5.7 130 9.5 7.2 132 Middle Powder 7760 6.0 9.9 61 6.1 10.1 60 Powder River Pass 9480 6.9 9.2 75 10.5 10.9 96 Soldier Park 8720 11.2 -M * 9.4 -M * ----- ----- Basin Index (%) 83 92 TONGUE RIVER Big Goose 7990 8.2 7.9 104 9.4 9.3 101 Bone Springs Div 9350 15.9 14.2 112 14.9 13.5 110 Burgess Junction 7880 8.1 9.6 84 9.1 10.6 86 Dome Lake 8880 12.4 10.3 120 12.2 11.6 105 Little Goose 8870 9.0 -M * 11.9 -M * Sucker Creek 8880 9.8 10.9 90 9.8 12.3 80 Tie Creek 6870 2.8 5.0 56 9.9 9.8 101 ----- ----- Basin Index (%) 99 97 BELLE FOURCHE Cole Canyon 5910 1.5 5.5 27 6.4 7.9 81 ----- ----- Basin Index (%) 27 81 CHEYENNE RIVER BASIN Blind Park 6890 2.4 7.2 33 7.9 10.5 75 North Rapid Creek 6130 3.5 6.5 54 6.7 8.6 78 ----- ----- Basin Index (%) 43 76 UPPER N. PLATTE Arapaho Ridge 10960 23.0 18.1 127 23.6 19.8 119 Blackhall Mtn 9820 34.2 -M * 35.3 -M * Columbine 9160 21.9 22.0 100 26.1 23.1 113 Divide Peak 8880 16.6 17.7 94 21.0 19.2 109 Joe Wright 10120 16.9 19.2 88 25.6 23.0 111 Laprele Creek 8375 10.4 9.2 113 10.6 10.9 97 Med Bow 10500 37.3 -M * 32.5 -M * North French Creek 10130 23.2 25.5 91 25.2 23.8 106 Never Summer 10280 21.0 17.9 117 17.3 -M * Old Battle 10000 35.4 26.6 133 36.4 31.6 115 Rawah 9020 9.9 9.6 103 15.1 12.3 123 Sage Creek Basin 7850 10.3 11.5 90 15.2 13.0 117 Sand Lake 10050 28.3 24.9 114 25.5 21.8 117 South Brush Creek 8440 7.6 11.2 68 11.7 13.4 87 Tower 10500 39.0 40.2 97 41.8 35.9 116 Webber Springs 9250 25.0 21.2 118 31.6 24.0 132 Willow Creek Pass 9540 16.3 11.0 148 17.1 11.8 145 Zirkel 9340 36.7 25.7 143 40.2 25.5 158 ----- ----- Basin Index (%) 110 119 SWEETWATER Deer Park 9700 27.0 13.5 200 32.2 17.3 186 Larsen Creek 9000 16.5 11.2 147 21.0 -M * South Pass 9040 25.4 14.0 181 23.8 15.5 154 ----- ----- Basin Index (%) 178 171 LOWER N. PLATTE Casper Mtn. 7900 9.9 12.3 80 10.4 12.9 81 Laprele Creek 8375 10.4 9.2 113 10.6 10.9 97 Reno Hill 8400 10.6 12.1 88 11.8 13.1 90 Windy Peak 7900 8.6 7.2 119 10.1 9.2 110 ----- ----- Basin Index (%) 97 93 LARAMIE RIVER Brooklyn Lake 10240 24.1 17.8 135 21.7 18.6 117 Cinnabar Park 9574 17.1 18.2 94 20.8 21.5 97 Crow Creek 8330 3.0 6.9 43 8.2 8.9 92 Deadman Hill 10220 19.2 14.0 137 18.2 15.1 121 Rawah 9020 9.9 9.6 103 15.1 12.3 123 Roach 9700 15.1 14.1 107 18.4 17.0 108 ----- ----- Basin Index (%) 110 110 S. PLATTE Black Mountain 8920 9.1 -M * 10.5 -M * Crow Creek 8330 3.0 6.9 43 8.2 8.9 92 Deadman Hill 10220 19.2 14.0 137 18.2 15.1 121 ----- ----- Basin Index (%) 106 110 LITTLE SNAKE RIVER Battle Mountain 7440 5.9 11.4 52 15.6 13.7 114 Divide Peak 8880 16.6 17.7 94 21.0 19.2 109 Elk River 8700 15.8 17.4 91 19.1 18.0 106 Little Snake River 8915 27.6 21.2 130 36.8 26.6 138 Old Battle 10000 35.4 26.6 133 36.4 31.6 115 Sage Creek Basin 7850 10.3 11.5 90 15.2 13.0 117 Sandstone RS 8150 10.6 12.4 85 15.2 16.8 90 Whiskey Park 8950 25.5 24.4 105 28.3 25.1 113 ----- ----- Basin Index (%) 104 114 UPPER GREEN RIVER Big Sandy Opening 9080 19.6 11.7 168 21.6 11.9 182 Blind Bull Sum 8650 40.8 20.6 198 -M 17.7 * East Rim Divide 7930 17.6 9.6 183 19.8 10.6 187 Elkhart Park G.S. 9400 17.6 10.8 163 22.1 11.9 186 Gros Ventre Summit 8750 -M 11.7 * -M 11.5 * Gunsight Pass 9820 19.8 12.1 164 22.4 12.2 184 Kendall R.S. 7740 21.6 11.3 191 27.6 13.0 212 Loomis Park 8240 26.0 13.4 194 30.6 15.6 196 New Fork Lake 8340 15.9 9.3 171 16.8 9.7 173 Pocket Creek 9360 -M -M * -M -M * Snider Basin 8060 18.1 11.1 163 25.5 12.8 199 Spring Creek Divide 9000 36.8 21.3 173 37.1 21.5 173 Triple Peak 8500 34.5 19.6 176 37.7 22.8 165 ----- ----- Basin Index (%) 178 184 LOWER GREEN RIVER Blacks Fork Jct 8869 8.5 -M * 13.6 -M * Buck Pasture 9632 16.4 -M * 20.7 -M * EF Blacks Fork GS 9360 13.7 -M * 14.2 -M * Hams Fork 7840 14.0 10.4 135 18.7 10.2 183 Hewinta 9500 7.1 10.0 71 14.3 12.4 115 Hickerson Park 9122 6.2 6.7 93 8.4 9.0 93 Hole-in-Rock 9168 4.7 6.7 70 9.1 8.4 108 Indian Creek 9425 37.0 21.5 172 -M 20.2 * Kelley R.S. 8180 24.3 13.5 180 28.4 16.3 174 Spirit Lk 10235 12.2 -M * 14.7 -M * Steel Creek Park 10158 15.2 13.5 113 17.1 14.4 119 ----- ----- Basin Index (%) 132 136 UPPER BEAR RIVER Bear River RS 8777 8.6 -M * 15.4 -M * Bug Lake 7987 29.5 16.8 176 30.0 17.5 171 Burts Miller Ranch 8000 3.6 -M * 8.5 -M * Chalk Creek #1 9171 30.6 21.4 143 32.0 22.3 143 Hayden Fork 9130 18.5 14.4 128 26.7 18.7 143 Kelley R.S. 8180 24.3 13.5 180 28.4 16.3 174 Lily Lake 9133 11.3 11.4 99 17.0 15.1 113 Monte Cristo 8932 32.4 24.6 132 34.7 23.3 149 Salt River Summit 7760 19.5 12.1 161 26.9 15.0 179 ----- ----- Basin Index (%) 145 153 ----------------------------------------------------------------------------- -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.