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: APRIL 7 , 2017 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7030 24.0 15.2 158 39.2 20.6 190 Black Bear 8170 45.4 37.2 122 52.7 37.8 139 Blind Bull Sum 8650 42.6 23.2 184 -M 19.3 * Cottonwood Creek 7670 27.1 21.0 129 37.2 24.3 153 East Rim Divide 7930 15.7 10.2 154 20.9 11.6 180 Grand Targhee 9260 44.5 38.5 116 39.5 30.6 129 Granite Creek 6770 26.0 14.5 179 35.7 19.5 183 Grassy Lake 7265 36.3 31.5 115 53.9 35.5 152 Gros Ventre Summit 8750 19.7 12.9 153 23.9 12.8 187 Gunsight Pass 9820 22.4 13.8 162 24.4 13.7 178 Lewis Lake Divide 7850 45.3 29.9 152 54.6 34.9 156 Phillips Bench 8200 37.1 25.4 146 45.8 27.8 165 Salt River Summit 7760 19.2 12.8 150 28.5 16.5 173 Snake River Station 6920 18.3 14.9 123 35.3 22.1 160 Spring Creek Divide 9000 40.0 22.5 178 39.6 23.5 169 Thumb Divide 7980 22.5 14.7 153 27.6 18.4 150 Togwotee Pass 9580 33.0 22.1 149 38.1 24.0 159 Two Ocean Plateau 9240 -M 26.0 * -M 26.8 * Willow Creek 8380 27.5 28.4 97 48.0 33.2 145 Younts Peak 8350 25.7 14.3 180 31.1 15.6 199 ----- ----- Basin Index (%) 142 160 MADISON-GALLATIN Black Bear 8170 45.4 37.2 122 52.7 37.8 139 Canyon 7870 17.0 12.4 137 25.4 16.0 159 Madison Plateau 7750 26.4 21.5 123 35.4 26.0 136 West Yellowstone 6700 6.7 9.5 71 22.6 14.1 160 Whiskey Creek 6800 13.3 14.8 90 26.5 19.9 133 ----- ----- Basin Index (%) 114 143 YELLOWSTONE Beartooth Lake 9360 32.5 21.3 153 27.7 19.4 143 Burnt Mtn 5880 .1 4.5 2 14.7 12.9 114 Canyon 7870 17.0 12.4 137 25.4 16.0 159 Cole Creek 7850 12.1 14.6 83 9.0 12.8 70 Evening Star 9200 38.3 23.8 161 44.4 26.9 165 Fisher Creek 9100 42.8 31.2 137 46.3 31.2 148 Northeast Entrance 7350 8.0 9.0 89 20.2 12.0 168 Parker Peak 9400 34.8 19.4 179 34.0 17.4 195 Sylvan Lake 8420 23.7 19.4 122 37.0 21.9 169 Thumb Divide 7980 22.5 14.7 153 27.6 18.4 150 Two Ocean Plateau 9240 -M 26.0 * -M 26.8 * White Mill 8700 35.6 22.2 160 35.5 23.3 152 Wolverine 7650 6.4 9.6 67 20.9 12.0 174 ----- ----- Basin Index (%) 135 153 WIND RIVER Burroughs Creek 8750 23.2 -M * 27.6 -M * Castle Creek 8400 11.0 -M * 15.7 -M * Cold Springs 9630 17.3 6.7 258 19.9 9.9 201 Deer Park 9700 32.5 15.6 208 37.6 19.8 190 Hobbs Park 10100 29.6 14.1 210 28.1 13.4 210 Kirwin 9550 -M 9.6 * 25.3 11.4 222 Little Warm 9370 18.6 10.2 182 24.3 12.7 191 Owl Creek 8975 10.3 5.8 178 12.6 6.0 210 South Pass 9040 31.2 15.2 205 28.6 17.3 165 St. Lawrence Alt 8620 10.7 6.9 155 17.2 8.9 193 Togwotee Pass 9580 33.0 22.1 149 38.1 24.0 159 Townsend Creek 8700 18.6 9.7 192 22.9 12.0 191 ----- ----- Basin Index (%) 190 188 BIGHORN BASIN Bald Mtn. 9380 19.6 19.1 103 16.9 16.8 101 Bear Trap Meadow 8200 5.1 4.9 104 8.8 8.5 104 Bone Springs Div 9350 20.0 16.9 118 18.1 15.4 118 Grave Springs 8550 7.0 9.4 74 7.9 10.6 75 Kirwin 9550 -M 9.6 * 25.3 11.4 222 Marquette 8760 14.2 -M * 17.8 -M * Middle Powder 7760 7.4 12.0 62 7.7 11.6 66 Owl Creek 8975 10.3 5.8 178 12.6 6.0 210 Powder River Pass 9480 9.1 10.2 89 13.5 12.5 108 Shell Creek 9580 17.5 15.1 116 14.6 13.6 107 Timber Creek 7950 8.3 4.9 169 11.6 7.3 159 ----- ----- Basin Index (%) 106 120 SHOSHONE RIVER Blackwater 9780 37.8 22.6 167 41.9 20.3 206 Evening Star 9200 38.3 23.8 161 44.4 26.9 165 Marquette 8760 14.2 -M * 17.8 -M * Sylvan Road 7120 7.2 10.8 67 30.2 16.5 183 Younts Peak 8350 25.7 14.3 180 31.1 15.6 199 ----- ----- Basin Index (%) 152 186 POWDER RIVER Bear Trap Meadow 8200 5.1 4.9 104 8.8 8.5 104 Cloud Peak Reservoir 9860 16.7 14.8 113 18.3 13.2 139 Grave Springs 8550 7.0 9.4 74 7.9 10.6 75 Hansen Sawmill 8360 11.5 6.1 189 14.2 8.5 167 Middle Powder 7760 7.4 12.0 62 7.7 11.6 66 Powder River Pass 9480 9.1 10.2 89 13.5 12.5 108 Soldier Park 8720 15.2 -M * 14.3 -M * ----- ----- Basin Index (%) 99 108 TONGUE RIVER Big Goose 7990 12.1 9.6 126 14.2 11.4 125 Bone Springs Div 9350 20.0 16.9 118 18.1 15.4 118 Burgess Junction 7880 10.8 11.9 91 12.1 12.3 98 Dome Lake 8880 16.6 11.8 141 16.8 13.5 124 Little Goose 8870 14.0 -M * 17.3 -M * Sucker Creek 8880 13.6 12.1 112 14.0 14.3 98 Tie Creek 6870 4.4 5.6 79 13.8 11.7 118 ----- ----- Basin Index (%) 114 113 BELLE FOURCHE Cole Canyon 5910 .0 5.1 0 7.4 9.5 78 ----- ----- Basin Index (%) 0 78 CHEYENNE RIVER BASIN Blind Park 6890 .0 7.0 0 9.1 11.8 77 North Rapid Creek 6130 .0 6.5 0 7.6 9.9 77 ----- ----- Basin Index (%) 0 77 UPPER N. PLATTE Arapaho Ridge 10960 25.3 20.9 121 26.0 22.3 117 Blackhall Mtn 9820 35.6 -M * 37.4 -M * Columbine 9160 18.8 23.4 80 27.1 25.4 107 Divide Peak 8880 16.3 19.9 82 22.5 21.3 106 Joe Wright 10120 18.8 21.2 89 28.6 25.6 112 Laprele Creek 8375 10.9 9.4 116 12.5 12.5 100 Med Bow 10500 38.2 -M * 34.8 -M * North French Creek 10130 24.1 29.4 82 27.1 26.6 102 Never Summer 10280 21.9 20.3 108 19.3 -M * Old Battle 10000 35.9 31.3 115 38.0 34.7 110 Rawah 9020 9.4 10.6 89 16.9 14.2 119 Sage Creek Basin 7850 6.5 11.9 55 16.5 14.6 113 Sand Lake 10050 30.6 28.8 106 27.4 24.6 111 South Brush Creek 8440 4.0 11.9 34 12.6 15.1 83 Tower 10500 39.2 45.8 86 43.3 39.6 109 Webber Springs 9250 26.1 23.1 113 33.1 26.6 124 Willow Creek Pass 9540 18.0 12.2 148 18.6 13.3 140 Zirkel 9340 32.2 26.3 122 41.8 28.4 147 ----- ----- Basin Index (%) 98 114 SWEETWATER Deer Park 9700 32.5 15.6 208 37.6 19.8 190 Larsen Creek 9000 16.9 11.6 146 23.2 -M * South Pass 9040 31.2 15.2 205 28.6 17.3 165 ----- ----- Basin Index (%) 190 178 LOWER N. PLATTE Casper Mtn. 7900 11.5 14.3 80 12.9 15.0 86 Laprele Creek 8375 10.9 9.4 116 12.5 12.5 100 Reno Hill 8400 12.6 14.0 90 14.3 15.5 92 Windy Peak 7900 8.8 7.7 114 11.7 10.5 111 ----- ----- Basin Index (%) 96 96 LARAMIE RIVER Brooklyn Lake 10240 22.7 21.8 104 23.0 21.0 110 Cinnabar Park 9574 17.5 21.2 83 22.2 24.0 92 Crow Creek 8330 .1 7.0 1 9.3 10.8 86 Deadman Hill 10220 20.8 16.1 129 20.3 17.2 118 Rawah 9020 9.4 10.6 89 16.9 14.2 119 Roach 9700 16.7 16.6 101 21.1 19.1 110 ----- ----- Basin Index (%) 93 106 S. PLATTE Black Mountain 8920 11.3 -M * 13.1 -M * Crow Creek 8330 .1 7.0 1 9.3 10.8 86 Deadman Hill 10220 20.8 16.1 129 20.3 17.2 118 ----- ----- Basin Index (%) 90 106 LITTLE SNAKE RIVER Battle Mountain 7440 -M 9.5 * 16.6 14.9 111 Divide Peak 8880 16.3 19.9 82 22.5 21.3 106 Elk River 8700 12.9 19.2 67 20.2 19.9 102 Little Snake River 8915 26.9 25.2 107 38.3 29.7 129 Old Battle 10000 35.9 31.3 115 38.0 34.7 110 Sage Creek Basin 7850 6.5 11.9 55 16.5 14.6 113 Sandstone RS 8150 6.3 12.8 49 16.2 18.2 89 Whiskey Park 8950 25.9 27.4 95 29.7 27.8 107 ----- ----- Basin Index (%) 88 109 UPPER GREEN RIVER Big Sandy Opening 9080 21.0 12.6 167 23.1 13.1 176 Blind Bull Sum 8650 42.6 23.2 184 -M 19.3 * East Rim Divide 7930 15.7 10.2 154 20.9 11.6 180 Elkhart Park G.S. 9400 19.1 12.3 155 24.0 13.2 182 Gros Ventre Summit 8750 19.7 12.9 153 23.9 12.8 187 Gunsight Pass 9820 22.4 13.8 162 24.4 13.7 178 Kendall R.S. 7740 19.9 11.4 175 28.9 14.1 205 Loomis Park 8240 26.6 13.8 193 31.9 17.1 187 New Fork Lake 8340 15.3 10.3 149 17.7 10.7 165 Pocket Creek 9360 -M -M * -M -M * Snider Basin 8060 18.0 12.3 146 27.0 14.0 193 Spring Creek Divide 9000 40.0 22.5 178 39.6 23.5 169 Triple Peak 8500 35.6 21.8 163 40.1 25.0 160 ----- ----- Basin Index (%) 167 179 LOWER GREEN RIVER Blacks Fork Jct 8869 9.4 -M * 16.0 -M * Buck Pasture 9632 17.8 -M * 23.6 -M * EF Blacks Fork GS 9360 15.6 -M * 17.4 -M * Hams Fork 7840 14.0 10.6 132 21.4 11.3 189 Hewinta 9500 9.6 10.9 88 17.4 14.0 124 Hickerson Park 9122 9.5 7.9 120 13.3 10.2 130 Hole-in-Rock 9168 7.8 7.0 111 13.8 9.7 142 Indian Creek 9425 40.2 24.7 163 -M 22.3 * Kelley R.S. 8180 24.9 14.7 169 30.0 17.9 168 Spirit Lk 10235 16.7 -M * 18.8 -M * Steel Creek Park 10158 19.2 15.8 122 21.1 16.4 129 ----- ----- Basin Index (%) 137 147 UPPER BEAR RIVER Bear River RS 8777 9.4 -M * 18.6 -M * Bug Lake 7987 31.9 18.4 173 33.7 19.2 176 Burts Miller Ranch 8000 2.8 -M * 10.2 -M * Chalk Creek #1 9171 33.6 24.4 138 36.0 25.0 144 Hayden Fork 9130 20.8 15.4 135 29.8 21.0 142 Kelley R.S. 8180 24.9 14.7 169 30.0 17.9 168 Lily Lake 9133 14.0 12.6 111 20.0 17.0 118 Monte Cristo 8932 35.9 27.7 130 38.8 25.7 151 Salt River Summit 7760 19.2 12.8 150 28.5 16.5 173 ----- ----- Basin Index (%) 143 152 ----------------------------------------------------------------------------- -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.