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: NOVEMBER 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 5.6 2.1 267 7.2 4.5 160 Black Bear 8170 10.7 6.7 160 9.5 7.9 120 Blind Bull Sum 8650 9.3 3.6 258 6.1 4.2 145 Cottonwood Creek 7670 3.8 2.8 136 5.0 5.2 96 East Rim Divide 7930 2.6 1.4 186 3.3 2.7 122 Grand Targhee 9260 16.0 8.6 186 9.4 8.9 106 Granite Creek 6770 -M 1.5 * -M 4.0 * Grassy Lake 7265 6.2 4.3 144 8.1 7.2 112 Gros Ventre Summit 8750 6.2 2.9 214 5.6 3.3 170 Gunsight Pass 9820 4.7 2.5 188 5.4 3.5 154 Lewis Lake Divide 7850 8.5 4.7 181 10.1 7.2 140 Phillips Bench 8200 6.7 3.6 186 7.7 5.4 143 Salt River Summit 7760 1.8 1.2 150* 3.3 3.3 100 Snake River Station 6920 3.9 1.6 244 6.5 4.9 133 Spring Creek Divide 9000 5.7 3.6 158 6.1 4.9 124 Thumb Divide 7980 5.3 2.1 252 6.5 4.2 155 Togwotee Pass 9580 9.9 5.2 190 9.4 5.6 168 Two Ocean Plateau 9240 14.4 6.4 225 9.1 6.2 147 Willow Creek 8380 6.6 3.8 174 8.9 7.2 124 Younts Peak 8350 6.9 3.1 223 6.4 4.0 160 ----- ----- Basin Index (%) 192 133 MADISON-GALLATIN Black Bear 8170 10.7 6.7 160 9.5 7.9 120 Canyon 7870 3.3 1.9 174 4.4 3.7 119 Madison Plateau 7750 6.5 3.5 186 6.8 5.3 128 West Yellowstone 6700 2.4 1.2 200 4.1 3.2 128 Whiskey Creek 6800 -M 2.0 * 4.5 4.3 105 ----- ----- Basin Index (%) 172 120 YELLOWSTONE Beartooth Lake 9360 11.0 4.9 224 9.1 4.3 212 Burnt Mtn 5880 2.5 .6 417 5.2 4.5 116 Canyon 7870 3.3 1.9 174 4.4 3.7 119 Cole Creek 7850 4.5 3.4 132 3.4 4.3 79 Evening Star 9200 11.9 5.3 225 11.5 6.4 180 Fisher Creek 9100 14.2 6.3 225 11.8 7.1 166 Northeast Entrance 7350 2.5 1.0 250 4.5 3.3 136 Parker Peak 9400 10.8 4.7 230 8.2 4.5 182 Sylvan Lake 8420 7.9 3.8 208 7.8 5.6 139 Thumb Divide 7980 5.3 2.1 252 6.5 4.2 155 Two Ocean Plateau 9240 14.4 6.4 225 9.1 6.2 147 White Mill 8700 11.6 4.5 258 7.1 5.5 129 Wolverine 7650 3.7 1.1 336 5.1 3.2 159 ----- ----- Basin Index (%) 225 149 WIND RIVER Burroughs Creek 8750 4.4 -M * 5.0 -M * Castle Creek 8400 2.0 -M * 3.3 -M * Cold Springs 9630 2.6 1.8 144 3.4 3.0 113 Deer Park 9700 5.2 3.3 158 5.8 4.7 123 Hobbs Park 10100 7.3 3.7 197 6.1 3.7 165 Kirwin 9550 7.1 2.8 254 5.6 3.3 170 Little Warm 9370 6.5 2.2 295 5.9 3.3 179 Owl Creek 8975 1.1 1.4 79 2.7 1.9 142 South Pass 9040 4.0 3.0 133 3.5 4.2 83 St. Lawrence Alt 8620 1.8 1.5 120 3.6 2.7 133 Togwotee Pass 9580 9.9 5.2 190 9.4 5.6 168 Townsend Creek 8700 2.8 1.9 147 4.0 3.5 114 ----- ----- Basin Index (%) 180 139 BIGHORN BASIN Bald Mtn. 9380 5.6 4.6 122 3.7 4.4 84 Bear Trap Meadow 8200 2.0 1.1 182 3.2 2.7 119 Bone Springs Div 9350 3.8 4.2 90 3.5 4.2 83 Grave Springs 8550 1.5 1.5 100 1.8 3.2 56 Kirwin 9550 7.1 2.8 254 5.6 3.3 170 Marquette 8760 2.1 -M * 4.3 -M * Middle Powder 7760 1.9 2.0 95 1.8 3.8 47 Owl Creek 8975 1.1 1.4 79 2.7 1.9 142 Powder River Pass 9480 4.9 2.2 223 4.3 3.4 126 Shell Creek 9580 7.1 4.0 178 4.3 3.8 113 Timber Creek 7950 1.3 1.4 93 1.1 2.9 38 ----- ----- Basin Index (%) 144 95 SHOSHONE RIVER Blackwater 9780 12.6 5.1 247 9.7 5.1 190 Evening Star 9200 11.9 5.3 225 11.5 6.4 180 Marquette 8760 2.1 -M * 4.3 -M * Sylvan Road 7120 3.9 1.6 244 6.3 4.4 143 Younts Peak 8350 6.9 3.1 223 6.4 4.0 160 ----- ----- Basin Index (%) 234 170 POWDER RIVER Bear Trap Meadow 8200 2.0 1.1 182 3.2 2.7 119 Cloud Peak Reservoir 9860 3.2 3.2 100 4.5 4.1 110 Grave Springs 8550 1.5 1.5 100 1.8 3.2 56 Hansen Sawmill 8360 2.3 1.1 209 3.3 2.7 122 Middle Powder 7760 1.9 2.0 95 1.8 3.8 47 Powder River Pass 9480 4.9 2.2 223 4.3 3.4 126 Soldier Park 8720 1.5 -M * 3.4 -M * ----- ----- Basin Index (%) 142 95 TONGUE RIVER Big Goose 7990 1.4 1.8 78 2.2 3.5 63 Bone Springs Div 9350 3.8 4.2 90 3.5 4.2 83 Burgess Junction 7880 1.7 2.5 68 2.4 3.6 67 Dome Lake 8880 2.7 3.0 90 3.0 4.1 73 Little Goose 8870 1.7 -M * 3.3 -M * Sucker Creek 8880 2.0 2.7 74 1.2 4.1 29 Tie Creek 6870 1.1 .6 183 2.5 3.7 68 ----- ----- Basin Index (%) 86 64 BELLE FOURCHE Cole Canyon 5910 .8 .5 160* 2.0 3.0 67 ----- ----- Basin Index (%) 160* 67 CHEYENNE RIVER BASIN Blind Park 6890 1.1 1.3 85 3.0 3.8 79 North Rapid Creek 6130 1.3 1.0 130 1.9 3.3 58 ----- ----- Basin Index (%) 104 69 UPPER N. PLATTE Arapaho Ridge 10960 4.9 4.7 104 5.4 5.7 95 Blackhall Mtn 9820 6.2 -M * 6.7 -M * Columbine 9160 2.5 3.2 78 5.7 5.4 106 Divide Peak 8880 2.9 3.4 85 5.9 5.3 111 Joe Wright 10120 3.6 4.8 75 8.8 6.5 135 Laprele Creek 8375 1.2 1.9 63 2.5 3.4 74 Med Bow 10500 8.3 -M * 7.5 -M * North French Creek 10130 6.1 4.9 124 6.9 6.0 115 Never Summer 10280 5.4 4.2 129 5.5 -M * Old Battle 10000 5.8 5.9 98 5.7 7.8 73 Rawah 9020 2.4 1.8 133 5.3 4.1 129 Sage Creek Basin 7850 1.6 1.7 94 3.2 3.7 86 Sand Lake 10050 7.1 5.4 131 6.5 5.8 112 South Brush Creek 8440 2.8 1.8 156 4.0 3.9 103 Tower 10500 6.1 8.7 70 8.5 8.9 96 Webber Springs 9250 3.3 3.5 94 5.7 6.0 95 Willow Creek Pass 9540 4.6 2.8 164 4.7 3.6 131 Zirkel 9340 3.5 3.4 103 7.8 6.8 115 ----- ----- Basin Index (%) 103 104 SWEETWATER Deer Park 9700 5.2 3.3 158 5.8 4.7 123 Larsen Creek 9000 1.9 1.6 119 3.1 -M * South Pass 9040 4.0 3.0 133 3.5 4.2 83 ----- ----- Basin Index (%) 141 104 LOWER N. PLATTE Casper Mtn. 7900 1.8 2.8 64 1.9 4.5 42 Laprele Creek 8375 1.2 1.9 63 2.5 3.4 74 Reno Hill 8400 2.5 2.6 96 3.5 4.2 83 Windy Peak 7900 1.2 1.4 86 2.4 3.0 80 ----- ----- Basin Index (%) 77 68 LARAMIE RIVER Brooklyn Lake 10240 3.6 3.5 103 5.3 4.5 118 Cinnabar Park 9574 4.9 3.8 129 6.7 5.2 129 Crow Creek 8330 .8 1.2 67 3.8 2.9 131 Deadman Hill 10220 6.5 3.7 176 6.7 4.3 156 Rawah 9020 2.4 1.8 133 5.3 4.1 129 Roach 9700 4.3 2.9 148 6.1 4.5 136 ----- ----- Basin Index (%) 133 133 S. PLATTE Black Mountain 8920 2.9 -M * 4.9 -M * Crow Creek 8330 .8 1.2 67 3.8 2.9 131 Deadman Hill 10220 6.5 3.7 176 6.7 4.3 156 ----- ----- Basin Index (%) 149 146 LITTLE SNAKE RIVER Battle Mountain 7440 .7 .9 78* 1.2 3.7 32 Divide Peak 8880 2.9 3.4 85 5.9 5.3 111 Elk River 8700 2.3 1.9 121* 4.9 4.5 109 Little Snake River 8915 2.8 3.0 93 6.4 7.0 91 Old Battle 10000 5.8 5.9 98 5.7 7.8 73 Sage Creek Basin 7850 1.6 1.7 94 3.2 3.7 86 Sandstone RS 8150 1.4 1.2 117* 2.6 4.3 60 Whiskey Park 8950 2.8 3.6 78 5.8 5.7 102 ----- ----- Basin Index (%) 94 85 UPPER GREEN RIVER Big Sandy Opening 9080 2.9 3.0 97 3.4 3.3 103 Blind Bull Sum 8650 9.3 3.6 258 6.1 4.2 145 East Rim Divide 7930 2.6 1.4 186 3.3 2.7 122 Elkhart Park G.S. 9400 2.7 2.5 108 3.0 3.4 88 Gros Ventre Summit 8750 6.2 2.9 214 5.6 3.3 170 Gunsight Pass 9820 4.7 2.5 188 5.4 3.5 154 Kendall R.S. 7740 3.4 1.8 189 4.2 3.1 135 Loomis Park 8240 4.0 2.1 190 4.6 3.7 124 New Fork Lake 8340 2.3 1.7 135 1.9 2.7 70 Pocket Creek 9360 3.5 -M * 3.1 -M * Snider Basin 8060 2.2 1.7 129 3.5 3.0 117 Spring Creek Divide 9000 5.7 3.6 158 6.1 4.9 124 Triple Peak 8500 6.2 3.6 172 7.9 5.1 155 ----- ----- Basin Index (%) 172 128 LOWER GREEN RIVER Blacks Fork Jct 8869 1.5 -M * 2.4 -M * Buck Pasture 9632 2.6 -M * 3.3 -M * EF Blacks Fork GS 9360 1.8 -M * 2.6 -M * Hams Fork 7840 1.2 1.4 86 2.3 2.7 85 Hewinta 9500 1.0 1.3 77 2.8 3.6 78 Hickerson Park 9122 1.8 1.3 138 1.5 3.2 47 Hole-in-Rock 9168 1.4 1.1 127 2.0 3.0 67 Indian Creek 9425 4.9 4.4 111 4.1 4.6 89 Kelley R.S. 8180 2.5 2.2 114 3.2 3.8 84 Spirit Lk 10235 1.9 -M * 2.2 -M * Steel Creek Park 10158 3.8 3.1 123 3.6 4.2 86 ----- ----- Basin Index (%) 112 78 UPPER BEAR RIVER Bear River RS 8777 1.6 -M * 2.8 -M * Bug Lake 7987 3.3 2.4 138 4.8 4.2 114 Burts Miller Ranch 8000 1.2 -M * 1.7 -M * Chalk Creek #1 9171 3.6 3.7 97 4.4 5.8 76 Hayden Fork 9130 2.4 2.1 114 3.5 4.8 73 Kelley R.S. 8180 2.5 2.2 114 3.2 3.8 84 Lily Lake 9133 1.9 2.1 90 2.8 4.3 65 Monte Cristo 8932 5.2 3.2 162 5.2 5.5 95 Salt River Summit 7760 1.8 1.2 150* 3.3 3.3 100 ----- ----- Basin Index (%) 122 86 ----------------------------------------------------------------------------- -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.