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 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 22.1 12.5 177 40.1 21.5 187 Black Bear 8170 47.6 36.8 129 55.6 39.3 141 Blind Bull Sum 8650 44.0 23.9 184 -M 20.0 * Cottonwood Creek 7670 27.0 19.3 140 39.2 25.3 155 East Rim Divide 7930 13.2 9.7 136 21.3 12.1 176 Grand Targhee 9260 48.2 41.5 116 43.2 32.3 134 Granite Creek 6770 23.5 11.7 201 36.4 20.1 181 Grassy Lake 7265 37.1 31.6 117 56.2 36.9 152 Gros Ventre Summit 8750 20.2 13.1 154 24.9 13.5 184 Gunsight Pass 9820 23.7 13.4 177 25.7 14.6 176 Lewis Lake Divide 7850 45.7 30.2 151 56.6 36.4 155 Phillips Bench 8200 38.2 25.9 147 47.4 28.8 165 Salt River Summit 7760 18.7 10.6 176 29.8 17.1 174 Snake River Station 6920 15.9 12.1 131 36.3 23.2 156 Spring Creek Divide 9000 41.6 23.4 178 41.2 24.4 169 Thumb Divide 7980 21.0 14.4 146 28.4 19.3 147 Togwotee Pass 9580 33.7 23.3 145 39.4 25.2 156 Two Ocean Plateau 9240 -M 27.6 * -M 28.1 * Willow Creek 8380 27.6 26.7 103 51.1 34.7 147 Younts Peak 8350 25.1 14.9 168 31.7 16.4 193 ----- ----- Basin Index (%) 145 160 MADISON-GALLATIN Black Bear 8170 47.6 36.8 129 55.6 39.3 141 Canyon 7870 17.8 12.4 144 26.3 16.8 157 Madison Plateau 7750 28.0 22.7 123 37.4 27.1 138 West Yellowstone 6700 3.9 8.1 48 23.9 14.7 163 Whiskey Creek 6800 13.1 14.9 88 27.8 20.9 133 ----- ----- Basin Index (%) 116 144 YELLOWSTONE Beartooth Lake 9360 33.4 22.8 146 28.7 20.4 141 Burnt Mtn 5880 .1 .0 * 15.0 13.7 109 Canyon 7870 17.8 12.4 144 26.3 16.8 157 Cole Creek 7850 12.0 15.9 75 9.5 14.2 67 Evening Star 9200 38.9 25.0 156 45.7 28.3 161 Fisher Creek 9100 44.3 32.1 138 48.6 32.9 148 Northeast Entrance 7350 4.9 7.6 64 20.9 12.7 165 Parker Peak 9400 37.1 20.7 179 35.3 18.4 192 Sylvan Lake 8420 24.3 20.2 120 38.1 23.2 164 Thumb Divide 7980 21.0 14.4 146 28.4 19.3 147 Two Ocean Plateau 9240 -M 27.6 * -M 28.1 * White Mill 8700 37.4 23.6 158 37.0 24.6 150 Wolverine 7650 3.4 8.1 42 21.2 12.6 168 ----- ----- Basin Index (%) 135 150 WIND RIVER Burroughs Creek 8750 21.5 -M * 28.0 -M * Castle Creek 8400 9.1 -M * 15.7 -M * Cold Springs 9630 16.3 5.4 302 20.4 10.6 192 Deer Park 9700 32.7 16.0 204 38.5 21.0 183 Hobbs Park 10100 29.9 14.8 202 29.1 14.4 202 Kirwin 9550 22.4 10.0 224 25.9 12.2 212 Little Warm 9370 18.8 10.2 184 25.4 13.6 187 Owl Creek 8975 9.4 4.7 200 13.4 6.6 203 South Pass 9040 31.6 15.7 201 29.2 18.2 160 St. Lawrence Alt 8620 8.8 6.0 147 17.5 9.6 182 Togwotee Pass 9580 33.7 23.3 145 39.4 25.2 156 Townsend Creek 8700 17.6 9.8 180 23.8 12.9 184 ----- ----- Basin Index (%) 191 182 BIGHORN BASIN Bald Mtn. 9380 20.8 19.5 107 18.1 17.9 101 Bear Trap Meadow 8200 4.3 4.0 108 9.7 9.2 105 Bone Springs Div 9350 20.6 16.4 126 18.8 16.4 115 Grave Springs 8550 7.0 9.6 73 8.7 11.3 77 Kirwin 9550 22.4 10.0 224 25.9 12.2 212 Marquette 8760 14.2 -M * 18.2 -M * Middle Powder 7760 8.5 12.5 68 8.5 12.5 68 Owl Creek 8975 9.4 4.7 200 13.4 6.6 203 Powder River Pass 9480 9.2 10.1 91 14.4 13.4 107 Shell Creek 9580 18.6 15.3 122 16.0 14.5 110 Timber Creek 7950 7.2 5.1 141 11.9 8.1 147 ----- ----- Basin Index (%) 119 119 SHOSHONE RIVER Blackwater 9780 38.7 23.7 163 43.1 21.5 200 Evening Star 9200 38.9 25.0 156 45.7 28.3 161 Marquette 8760 14.2 -M * 18.2 -M * Sylvan Road 7120 2.1 10.2 21 31.0 17.2 180 Younts Peak 8350 25.1 14.9 168 31.7 16.4 193 ----- ----- Basin Index (%) 142 182 POWDER RIVER Bear Trap Meadow 8200 4.3 4.0 108 9.7 9.2 105 Cloud Peak Reservoir 9860 17.0 15.5 110 20.3 14.4 141 Grave Springs 8550 7.0 9.6 73 8.7 11.3 77 Hansen Sawmill 8360 11.3 5.4 209 15.6 9.3 168 Middle Powder 7760 8.5 12.5 68 8.5 12.5 68 Powder River Pass 9480 9.2 10.1 91 14.4 13.4 107 Soldier Park 8720 14.9 -M * 15.7 -M * ----- ----- Basin Index (%) 100 110 TONGUE RIVER Big Goose 7990 12.0 9.6 125 15.3 12.2 125 Bone Springs Div 9350 20.6 16.4 126 18.8 16.4 115 Burgess Junction 7880 11.1 12.2 91 12.9 13.1 98 Dome Lake 8880 16.7 11.9 140 17.7 14.5 122 Little Goose 8870 14.6 -M * 18.6 -M * Sucker Creek 8880 13.5 12.7 106 15.1 15.4 98 Tie Creek 6870 1.2 4.5 27 14.4 12.4 116 ----- ----- Basin Index (%) 112 112 BELLE FOURCHE Cole Canyon 5910 .0 2.6 0 7.8 10.1 77 ----- ----- Basin Index (%) 0 77 CHEYENNE RIVER BASIN Blind Park 6890 .0 4.6 0 9.7 12.5 78 North Rapid Creek 6130 .0 4.8 0 8.1 10.5 77 ----- ----- Basin Index (%) 0 77 UPPER N. PLATTE Arapaho Ridge 10960 24.5 21.5 114 26.4 23.9 110 Blackhall Mtn 9820 35.0 -M * 38.2 -M * Columbine 9160 13.0 21.2 61 27.6 26.6 104 Divide Peak 8880 12.8 19.6 65 23.3 22.4 104 Joe Wright 10120 16.3 22.1 74 28.7 27.2 106 Laprele Creek 8375 7.3 8.8 83 12.7 13.3 95 Med Bow 10500 35.1 -M * 35.7 -M * North French Creek 10130 24.0 32.0 75 27.9 28.0 100 Never Summer 10280 21.9 20.6 106 19.6 -M * Old Battle 10000 36.4 32.3 113 38.9 36.4 107 Rawah 9020 5.2 9.2 57 17.4 15.3 114 Sage Creek Basin 7850 -M 7.6 * 16.9 15.0 113 Sand Lake 10050 30.4 30.4 100 28.2 26.2 108 South Brush Creek 8440 -M 10.3 * 12.9 16.1 80 Tower 10500 37.8 47.5 80 44.2 41.4 107 Webber Springs 9250 25.2 22.8 111 33.8 27.9 121 Willow Creek Pass 9540 18.1 12.7 143 18.6 14.1 132 Zirkel 9340 27.2 23.2 117 42.4 29.5 144 ----- ----- Basin Index (%) 93 110 SWEETWATER Deer Park 9700 32.7 16.0 204 38.5 21.0 183 Larsen Creek 9000 13.4 10.6 126 23.5 -M * South Pass 9040 31.6 15.7 201 29.2 18.2 160 ----- ----- Basin Index (%) 184 173 LOWER N. PLATTE Casper Mtn. 7900 10.4 14.4 72 13.6 16.1 84 Laprele Creek 8375 7.3 8.8 83 12.7 13.3 95 Reno Hill 8400 12.1 14.1 86 15.3 16.6 92 Windy Peak 7900 5.5 7.1 77 11.9 11.3 105 ----- ----- Basin Index (%) 80 93 LARAMIE RIVER Brooklyn Lake 10240 21.1 22.1 95 23.5 22.3 105 Cinnabar Park 9574 14.0 20.7 68 22.6 25.0 90 Crow Creek 8330 .0 2.3 0 9.2 11.7 79 Deadman Hill 10220 20.7 16.5 125 20.8 18.4 113 Rawah 9020 5.2 9.2 57 17.4 15.3 114 Roach 9700 15.2 16.5 92 21.6 20.2 107 ----- ----- Basin Index (%) 87 102 S. PLATTE Black Mountain 8920 8.8 -M * 13.3 -M * Crow Creek 8330 .0 2.3 0 9.2 11.7 79 Deadman Hill 10220 20.7 16.5 125 20.8 18.4 113 ----- ----- Basin Index (%) 110 100 LITTLE SNAKE RIVER Battle Mountain 7440 .0 5.8 0 17.0 15.7 108 Divide Peak 8880 12.8 19.6 65 23.3 22.4 104 Elk River 8700 8.4 16.5 51 20.5 20.9 98 Little Snake River 8915 23.1 25.3 91 39.1 30.9 127 Old Battle 10000 36.4 32.3 113 38.9 36.4 107 Sage Creek Basin 7850 -M 7.6 * 16.9 15.0 113 Sandstone RS 8150 1.3 11.1 12 16.2 19.1 85 Whiskey Park 8950 22.7 26.5 86 30.5 29.1 105 ----- ----- Basin Index (%) 76 107 UPPER GREEN RIVER Big Sandy Opening 9080 20.7 12.8 162 23.5 13.8 170 Blind Bull Sum 8650 44.0 23.9 184 -M 20.0 * East Rim Divide 7930 13.2 9.7 136 21.3 12.1 176 Elkhart Park G.S. 9400 19.7 12.0 164 24.8 13.8 180 Gros Ventre Summit 8750 20.2 13.1 154 24.9 13.5 184 Gunsight Pass 9820 23.7 13.4 177 25.7 14.6 176 Kendall R.S. 7740 17.3 9.3 186 29.4 14.6 201 Loomis Park 8240 25.4 13.3 191 32.7 17.7 185 New Fork Lake 8340 13.6 9.3 146 18.4 11.1 166 Pocket Creek 9360 -M -M * -M -M * Snider Basin 8060 16.9 11.3 150 27.9 14.6 191 Spring Creek Divide 9000 41.6 23.4 178 41.2 24.4 169 Triple Peak 8500 35.5 19.3 184 41.7 26.0 160 ----- ----- Basin Index (%) 171 177 LOWER GREEN RIVER Blacks Fork Jct 8869 6.6 -M * 16.5 -M * Buck Pasture 9632 16.1 -M * 24.2 -M * EF Blacks Fork GS 9360 12.5 -M * 18.0 -M * Hams Fork 7840 11.4 7.8 146 22.0 11.8 186 Hewinta 9500 7.4 9.1 81 18.0 14.6 123 Hickerson Park 9122 6.9 6.1 113 13.5 10.8 125 Hole-in-Rock 9168 6.4 6.4 100 14.0 10.3 136 Indian Creek 9425 40.5 23.5 172 41.8 23.2 180 Kelley R.S. 8180 24.5 13.4 183 31.2 18.6 168 Spirit Lk 10235 15.6 -M * 19.1 -M * Steel Creek Park 10158 19.2 16.1 119 21.7 17.4 125 ----- ----- Basin Index (%) 141 152 UPPER BEAR RIVER Bear River RS 8777 4.7 -M * 19.1 -M * Bug Lake 7987 32.2 18.4 175 34.8 20.0 174 Burts Miller Ranch 8000 .0 -M * 10.6 -M * Chalk Creek #1 9171 32.7 24.9 131 37.1 26.3 141 Hayden Fork 9130 15.4 13.0 118 30.4 22.0 138 Kelley R.S. 8180 24.5 13.4 183 31.2 18.6 168 Lily Lake 9133 11.8 11.7 101 20.4 17.9 114 Monte Cristo 8932 36.2 27.6 131 40.6 26.9 151 Salt River Summit 7760 18.7 10.6 176 29.8 17.1 174 ----- ----- Basin Index (%) 143 151 ----------------------------------------------------------------------------- -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.