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 SATURDAY: SEPTEMBER 23 , 2017 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7030 .0 .0 * 51.7 31.5 164 Black Bear 8170 2.4 .0 * 72.5 54.3 134 Blind Bull Sum 8650 .6 .0 * 46.7 30.3 154 Cottonwood Creek 7670 .1 .0 * 53.5 38.5 139 East Rim Divide 7930 .0 .0 * 29.6 19.6 151 Grand Targhee 9260 2.0 .0 * 64.8 47.2 137 Granite Creek 6770 .0 .0 * 47.8 29.3 163 Grassy Lake 7265 .6 .0 * 72.1 51.5 140 Gros Ventre Summit 8750 .1 .0 * 35.3 23.1 153 Gunsight Pass 9820 1.6 .0 * -M 25.5 * Lewis Lake Divide 7850 1.1 .0 * 73.5 50.0 147 Phillips Bench 8200 .0 .0 * 59.5 40.8 146 Salt River Summit 7760 .0 .0 * 35.9 26.2 137 Snake River Station 6920 .0 .0 * 48.7 34.5 141 Spring Creek Divide 9000 .3 .0 * 51.5 35.3 146 Thumb Divide 7980 1.4 .0 * 40.5 29.3 138 Togwotee Pass 9580 2.4 .0 * 55.0 38.1 144 Two Ocean Plateau 9240 -M .0 * 67.0 42.6 157 Willow Creek 8380 .2 .0 * 68.2 51.1 133 Younts Peak 8350 1.9 .0 * 47.4 28.7 165 ----- ----- Basin Index (%) * 145 MADISON-GALLATIN Black Bear 8170 2.4 .0 * 72.5 54.3 134 Canyon 7870 1.2 .0 * 37.3 27.3 137 Madison Plateau 7750 1.7 .0 * 50.4 40.1 126 West Yellowstone 6700 .1 .0 * 34.1 23.7 144 Whiskey Creek 6800 .0 .0 * 39.0 32.4 120 ----- ----- Basin Index (%) * 131 YELLOWSTONE Beartooth Lake 9360 1.6 .0 * 42.5 32.5 131 Burnt Mtn 5880 .7 .0 * 30.6 29.2 105 Canyon 7870 1.2 .0 * 37.3 27.3 137 Cole Creek 7850 2.1 .0 * 25.2 30.6 82 Evening Star 9200 3.0 .0 * 62.0 44.2 140 Fisher Creek 9100 -M .0 * 66.5 50.9 131 Northeast Entrance 7350 1.2 .0 * 32.9 24.5 134 Parker Peak 9400 3.0 .0 * 53.9 31.2 173 Sylvan Lake 8420 3.6 .0 * 56.7 37.4 152 Thumb Divide 7980 1.4 .0 * 40.5 29.3 138 Two Ocean Plateau 9240 -M .0 * 67.0 42.6 157 White Mill 8700 3.6 .0 * 52.2 39.8 131 Wolverine 7650 .3 .0 * 32.9 23.0 143 ----- ----- Basin Index (%) * 136 WIND RIVER Burroughs Creek 8750 1.2 -M * 36.8 -M * Castle Creek 8400 .5 -M * 28.3 -M * Cold Springs 9630 1.2 .0 * 30.6 21.4 143 Deer Park 9700 .5 .0 * 52.9 34.5 153 Hobbs Park 10100 .6 .0 * 44.3 27.3 162 Kirwin 9550 1.7 .0 * 39.9 25.7 155 Little Warm 9370 1.3 .0 * 36.1 25.4 142 Owl Creek 8975 .5 .0 * 27.3 16.9 162 South Pass 9040 .0 .0 * 42.6 29.1 146 St. Lawrence Alt 8620 .1 .0 * 29.2 19.9 147 Togwotee Pass 9580 2.4 .0 * 55.0 38.1 144 Townsend Creek 8700 .2 .0 * 37.6 24.1 156 ----- ----- Basin Index (%) * 151 BIGHORN BASIN Bald Mtn. 9380 1.5 .0 * 30.6 31.5 97 Bear Trap Meadow 8200 .1 .0 * 22.7 20.3 112 Bone Springs Div 9350 .3 .0 * 34.6 30.7 113 Grave Springs 8550 .2 .0 * 18.2 22.6 81 Kirwin 9550 1.7 .0 * 39.9 25.7 155 Marquette 8760 .8 -M * 33.4 -M * Middle Powder 7760 .2 .0 * 18.4 24.5 75 Owl Creek 8975 .5 .0 * 27.3 16.9 162 Powder River Pass 9480 .3 .0 * 29.8 26.2 114 Shell Creek 9580 1.1 .0 * 29.1 27.8 105 Timber Creek 7950 .6 .0 * 25.9 20.9 124 ----- ----- Basin Index (%) * 112 SHOSHONE RIVER Blackwater 9780 3.0 .0 * 59.3 35.7 166 Evening Star 9200 3.0 .0 * 62.0 44.2 140 Marquette 8760 .8 -M * 33.4 -M * Sylvan Road 7120 1.2 .0 * 44.3 28.0 158 Younts Peak 8350 1.9 .0 * 47.4 28.7 165 ----- ----- Basin Index (%) * 156 POWDER RIVER Bear Trap Meadow 8200 .1 .0 * 22.7 20.3 112 Cloud Peak Reservoir 9860 .2 .0 * 36.6 29.8 123 Grave Springs 8550 .2 .0 * 18.2 22.6 81 Hansen Sawmill 8360 .2 .0 * 30.6 21.5 142 Middle Powder 7760 .2 .0 * 18.4 24.5 75 Powder River Pass 9480 .3 .0 * 29.8 26.2 114 Soldier Park 8720 .1 -M * 30.7 -M * ----- ----- Basin Index (%) * 108 TONGUE RIVER Big Goose 7990 .2 .0 * 26.5 24.2 110 Bone Springs Div 9350 .3 .0 * 34.6 30.7 113 Burgess Junction 7880 .1 .0 * 27.6 25.0 110 Dome Lake 8880 .0 .0 * 32.1 27.8 115 Little Goose 8870 .1 -M * 33.1 -M * Sucker Creek 8880 .1 .0 * 32.2 29.3 110 Tie Creek 6870 .1 .0 * 32.1 26.3 122 ----- ----- Basin Index (%) * 113 BELLE FOURCHE Cole Canyon 5910 .0 .0 * 24.2 25.1 96 ----- ----- Basin Index (%) * 96 CHEYENNE RIVER BASIN Blind Park 6890 .0 .0 * 24.9 27.3 91 North Rapid Creek 6130 .2 .0 * 24.3 27.0 90 ----- ----- Basin Index (%) * 91 UPPER N. PLATTE Arapaho Ridge 10960 -M .0 * -M 38.0 * Blackhall Mtn 9820 .8 -M * 50.0 -M * Columbine 9160 .3 .0 * 39.4 37.7 105 Divide Peak 8880 .0 .0 * 30.8 33.3 92 Joe Wright 10120 .3 .0 * 44.0 43.5 101 Laprele Creek 8375 .0 .0 * 23.4 23.8 98 Med Bow 10500 .2 -M * 53.3 -M * North French Creek 10130 -M .0 * 43.0 42.7 101 Never Summer 10280 -M .0 * 31.0 -M * Old Battle 10000 .2 .0 * 52.3 51.1 102 Rawah 9020 .1 .0 * 27.2 26.7 102 Sage Creek Basin 7850 -M .0 * 22.5 22.7 99 Sand Lake 10050 .0 .0 * 42.5 40.4 105 South Brush Creek 8440 .1 .0 * 20.7 27.1 76 Tower 10500 -M .0 * -M 57.8 * Webber Springs 9250 .6 .0 * 45.1 39.9 113 Willow Creek Pass 9540 .1 .0 * 27.8 25.6 109 Zirkel 9340 .0 .0 * 56.4 42.9 131 ----- ----- Basin Index (%) * 104 SWEETWATER Deer Park 9700 .5 .0 * 52.9 34.5 153 Larsen Creek 9000 .0 .0 * 34.5 -M * South Pass 9040 .0 .0 * 42.6 29.1 146 ----- ----- Basin Index (%) * 150 LOWER N. PLATTE Casper Mtn. 7900 .2 .0 * 27.8 27.5 101 Laprele Creek 8375 .0 .0 * 23.4 23.8 98 Reno Hill 8400 .1 .0 * 26.4 28.2 94 Windy Peak 7900 .1 .0 * 22.6 22.5 100 ----- ----- Basin Index (%) * 98 LARAMIE RIVER Brooklyn Lake 10240 .0 .0 * 33.6 34.9 96 Cinnabar Park 9574 .0 .0 * 35.3 37.6 94 Crow Creek 8330 -M .0 * 20.1 25.5 79 Deadman Hill 10220 .1 .0 * 35.0 30.6 114 Rawah 9020 .1 .0 * 27.2 26.7 102 Roach 9700 .1 .0 * 34.6 32.9 105 ----- ----- Basin Index (%) * 99 S. PLATTE Black Mountain 8920 .0 -M * 26.1 -M * Crow Creek 8330 -M .0 * 20.1 25.5 79 Deadman Hill 10220 .1 .0 * 35.0 30.6 114 ----- ----- Basin Index (%) * 98 LITTLE SNAKE RIVER Battle Mountain 7440 .0 .0 * 22.8 23.8 96 Divide Peak 8880 .0 .0 * 30.8 33.3 92 Elk River 8700 .1 .0 * 29.7 31.9 93 Little Snake River 8915 .2 .0 * 53.8 43.2 125 Old Battle 10000 .2 .0 * 52.3 51.1 102 Sage Creek Basin 7850 -M .0 * 22.5 22.7 99 Sandstone RS 8150 .2 .0 * 23.5 28.9 81 Whiskey Park 8950 .2 .0 * 41.4 41.3 100 ----- ----- Basin Index (%) * 100 UPPER GREEN RIVER Big Sandy Opening 9080 .6 .0 * 33.4 23.7 141 Blind Bull Sum 8650 .6 .0 * 46.7 30.3 154 East Rim Divide 7930 .0 .0 * 29.6 19.6 151 Elkhart Park G.S. 9400 .3 .0 * 34.7 24.2 143 Gros Ventre Summit 8750 .1 .0 * 35.3 23.1 153 Gunsight Pass 9820 1.6 .0 * -M 25.5 * Kendall R.S. 7740 .2 .0 * 40.1 22.6 177 Loomis Park 8240 .1 .0 * 43.6 27.3 160 New Fork Lake 8340 .1 .0 * 27.4 19.9 138 Pocket Creek 9360 .8 -M * 33.6 -M * Snider Basin 8060 .0 .0 * 33.2 21.6 154 Spring Creek Divide 9000 .3 .0 * 51.5 35.3 146 Triple Peak 8500 .0 .0 * 52.9 37.6 141 ----- ----- Basin Index (%) * 150 LOWER GREEN RIVER Blacks Fork Jct 8869 .0 -M * 24.9 -M * Buck Pasture 9632 .1 -M * 36.0 -M * EF Blacks Fork GS 9360 .0 -M * 31.0 -M * Hams Fork 7840 -M .0 * -M 19.4 * Hewinta 9500 .0 .0 * 28.8 25.6 112 Hickerson Park 9122 .4 .0 * 23.3 21.4 109 Hole-in-Rock 9168 .0 .0 * 25.0 20.9 120 Indian Creek 9425 .0 .0 * 51.4 33.3 154 Kelley R.S. 8180 .1 .0 * 41.8 27.6 151 Spirit Lk 10235 .2 -M * 31.7 -M * Steel Creek Park 10158 .4 .0 * 35.0 29.5 119 ----- ----- Basin Index (%) * 130 UPPER BEAR RIVER Bear River RS 8777 .1 -M * 27.2 -M * Bug Lake 7987 .8 .0 * 44.2 29.2 151 Burts Miller Ranch 8000 .4 -M * 15.5 -M * Chalk Creek #1 9171 .6 .0 * 51.2 39.7 129 Hayden Fork 9130 .2 .0 * 41.1 33.7 122 Kelley R.S. 8180 .1 .0 * 41.8 27.6 151 Lily Lake 9133 .0 .0 * 31.4 28.9 109 Monte Cristo 8932 .3 .0 * 52.9 38.7 137 Salt River Summit 7760 .0 .0 * 35.9 26.2 137 ----- ----- Basin Index (%) * 133 ----------------------------------------------------------------------------- -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.