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: DECEMBER 20 , 2019 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 4.9 5.8 84 5.4 8.5 64 Black Bear 8170 9.9 14.2 70 10.2 15.1 68 Blind Bull Sum 8650 8.1 7.8 104 5.1 7.9 65 Cottonwood Creek 7670 8.6 7.0 123 8.8 9.5 93 East Rim Divide 7930 3.8 3.5 109 3.4 4.6 74 Grand Targhee 9260 15.5 14.3 108 9.8 12.7 77 Granite Creek 6770 4.7 4.7 100 5.1 7.8 65 Grassy Lake 7265 8.4 10.0 84 14.7 13.9 106 Gros Ventre Summit 8750 4.1 4.8 85 4.1 5.3 77 Gunsight Pass 9820 4.8 4.4 109 5.1 5.4 94 Lewis Lake Divide 7850 7.0 10.2 69 9.8 14.0 70 Phillips Bench 8200 8.4 8.7 97 8.4 10.6 79 Salt River Summit 7640 4.5 3.7 122 5.2 6.2 84 Snake River Station 6920 5.4 5.2 104 7.2 9.3 77 Spring Creek Divide 9000 7.6 8.1 94 7.7 9.2 84 Thumb Divide 7980 4.5 5.0 90 5.4 7.4 73 Togwotee Pass 9580 10.0 9.4 106 9.3 9.9 94 Two Ocean Plateau 9240 10.7 10.8 99 8.0 10.9 73 Willow Creek 8080 9.2 8.8 105 11.1 13.2 84 Younts Peak 8350 6.6 5.7 116 4.2 6.6 64 ----- ----- Basin Index (%) 96 79 MADISON-GALLATIN Black Bear 8170 9.9 14.2 70 10.2 15.1 68 Canyon 7870 4.6 4.3 107 4.8 6.6 73 Madison Plateau 7750 6.5 8.5 76 6.3 10.3 61 West Yellowstone 6700 3.4 3.6 94 2.8 5.9 47 Whiskey Creek 6800 4.8 5.2 92 6.0 8.3 72 ----- ----- Basin Index (%) 82 65 YELLOWSTONE Beartooth Lake 9360 8.9 8.4 106 8.0 7.7 104 Burnt Mtn 5880 1.7 1.7 100 6.1 6.2 98 Canyon 7870 4.6 4.3 107 4.8 6.6 73 Cole Creek 7850 7.1 5.6 127 5.9 5.9 100 Evening Star 9200 10.5 9.4 112 11.8 11.3 104 Fisher Creek 9100 11.1 12.6 88 11.9 12.7 94 Northeast Entrance 7350 3.8 2.8 136 5.0 5.3 94 Parker Peak 9400 10.2 8.3 123 9.3 7.5 124 Sylvan Lake 8420 7.7 7.7 100 9.1 9.6 95 Thumb Divide 7980 4.5 5.0 90 5.4 7.4 73 Two Ocean Plateau 9240 10.7 10.8 99 8.0 10.9 73 White Mill 8700 9.7 8.5 114 7.5 9.6 78 Wolverine 7650 5.3 3.6 147 6.0 5.5 109 Younts Peak 8350 6.6 5.7 116 4.2 6.6 64 ----- ----- Basin Index (%) 108 91 WIND RIVER Burroughs Creek 8750 4.8 -M * 6.0 -M * Castle Creek 8400 2.6 -M * 3.3 -M * Cold Springs 9630 3.5 2.8 125 3.5 4.5 78 Deer Park 9700 5.1 5.2 98 4.5 7.4 61 Hobbs Park 10100 5.2 5.9 88 4.9 5.5 89 Kirwin 9550 6.1 4.1 149 4.8 5.0 96 Little Warm 9370 5.5 3.8 145 3.5 5.4 65 Owl Creek 8975 2.6 2.3 113 3.1 2.6 119 South Pass 9040 4.3 5.5 78 3.8 7.2 53 St. Lawrence Alt 8620 2.5 2.5 100 3.3 3.9 85 Togwotee Pass 9580 10.0 9.4 106 9.3 9.9 94 Townsend Creek 8700 4.3 3.3 130 4.5 5.2 87 ----- ----- Basin Index (%) 110 80 BIGHORN BASIN Bald Mtn. 9380 10.0 7.1 141 7.2 6.8 106 Bear Trap Meadow 8200 4.6 2.2 209 5.6 3.8 147 Bone Springs Div 9350 7.5 6.4 117 5.7 6.2 92 Grave Springs 8550 5.0 2.7 185 5.7 4.4 130 Kirwin 9550 6.1 4.1 149 4.8 5.0 96 Marquette 8760 3.8 -M * 4.6 -M * Middle Powder 7760 5.6 4.0 140 6.4 5.5 116 Owl Creek 8975 2.6 2.3 113 3.1 2.6 119 Powder River Pass 9480 6.2 3.9 159 6.4 5.1 125 Shell Creek 9580 7.0 6.3 111 5.1 5.8 88 Timber Creek 7950 3.3 1.9 174 3.8 3.6 106 ----- ----- Basin Index (%) 142 110 SHOSHONE RIVER Blackwater 9780 9.5 9.2 103 8.7 8.8 99 Evening Star 9200 10.5 9.4 112 11.8 11.3 104 Marquette 8760 3.8 -M * 4.6 -M * Sylvan Lake 8420 7.7 7.7 100 9.1 9.6 95 Sylvan Road 7120 4.7 4.3 109 8.1 7.9 103 Younts Peak 8350 6.6 5.7 116 4.2 6.6 64 ----- ----- Basin Index (%) 107 95 POWDER RIVER Bear Trap Meadow 8200 4.6 2.2 209 5.6 3.8 147 Cloud Peak Reservoir 9860 5.7 5.1 112 6.2 5.6 111 Grave Springs 8550 5.0 2.7 185 5.7 4.4 130 Hansen Sawmill 8360 3.3 2.4 138 4.0 3.7 108 Middle Powder 7760 5.6 4.0 140 6.4 5.5 116 Powder River Pass 9480 6.2 3.9 159 6.4 5.1 125 Soldier Park 8720 2.1 -M * 4.1 -M * ----- ----- Basin Index (%) 150 122 TONGUE RIVER Big Goose 7990 3.6 3.1 116 4.9 4.7 104 Bone Springs Div 9350 7.5 6.4 117 5.7 6.2 92 Burgess Junction 7880 4.8 4.0 120 -M 5.2 * Dome Lake 8880 3.8 4.6 83 3.4 6.1 56 Little Goose 8870 4.5 -M * 4.0 -M * Sucker Creek 8880 6.0 4.2 143 5.2 6.0 87 Tie Creek 6870 3.1 1.2 258 6.0 4.9 122 ----- ----- Basin Index (%) 123 90 BELLE FOURCHE Blind Park 6890 3.6 2.3 157 4.5 5.2 87 Cole Canyon 5910 2.6 1.0 260 6.5 4.1 159 ----- ----- Basin Index (%) 188 118 CHEYENNE RIVER BASIN Blind Park 6890 3.6 2.3 157 4.5 5.2 87 North Rapid Creek 6130 3.1 2.5 124 4.5 4.4 102 ----- ----- Basin Index (%) 140 94 UPPER N. PLATTE Arapaho Ridge 10960 9.2 8.0 115 9.2 9.4 98 Blackhall Mtn 9820 11.1 -M * 11.7 -M * Columbine 9160 10.4 7.3 142 -M 9.9 * Divide Peak 8880 8.3 6.8 122 9.2 8.9 103 Joe Wright 10120 6.7 8.3 81 10.4 10.6 98 Laprele Creek 8375 5.8 3.2 181 6.3 5.2 121 Med Bow 10500 16.1 -M * 14.2 -M * Never Summer 10280 7.7 7.2 107 5.6 -M * North French Creek 10130 11.9 10.0 119 12.1 10.4 116 Old Battle 10000 12.6 10.9 116 12.0 14.0 86 Rawah 9020 5.6 3.7 151 7.0 6.4 109 Sage Creek Basin 7850 6.0 4.4 136 5.0 6.1 82 Sand Lake 10050 11.5 9.7 119 10.8 9.8 110 South Brush Creek 8440 4.7 4.1 115 5.3 6.3 84 Tower 10500 16.7 17.1 98 16.0 15.9 101 Webber Springs 9250 8.9 8.2 109 9.9 10.7 93 Whiskey Park 8950 11.7 8.0 146 12.8 10.3 124 Willow Creek Pass 9540 5.3 4.8 110 4.8 5.7 84 Zirkel 9340 10.3 7.8 132 12.3 11.7 105 ----- ----- Basin Index (%) 118 101 SWEETWATER Deer Park 9700 5.1 5.2 98 4.5 7.4 61 Larsen Creek 9000 -M 4.0 * 3.0 -M * South Pass 9040 4.3 5.5 78 3.8 7.2 53 ----- ----- Basin Index (%) 88 57 LOWER N. PLATTE Casper Mtn. 7900 7.9 5.0 158 5.9 6.6 89 Laprele Creek 8375 5.8 3.2 181 6.3 5.2 121 Reno Hill 8400 7.8 5.1 153 8.3 6.3 132 Windy Peak 7900 4.7 2.7 174 4.0 4.6 87 ----- ----- Basin Index (%) 164 108 LARAMIE RIVER Brooklyn Lake 10240 10.3 6.9 149 10.6 7.9 134 Cinnabar Park 9574 10.3 7.5 137 11.6 9.8 118 Crow Creek 8330 4.2 3.8 111 5.9 4.6 128 Deadman Hill 10220 8.2 6.1 134 7.2 6.7 107 Rawah 9020 5.6 3.7 151 7.0 6.4 109 Roach 9700 6.8 5.6 121 6.4 7.7 83 Windy Peak 7900 4.7 2.7 174 4.0 4.6 87 ----- ----- Basin Index (%) 138 110 S. PLATTE Black Mountain 8920 5.3 -M * 6.1 -M * Crow Creek 8330 4.2 3.8 111 5.9 4.6 128 Deadman Hill 10220 8.2 6.1 134 7.2 6.7 107 ----- ----- Basin Index (%) 125 116 LITTLE SNAKE RIVER Battle Mountain 7440 5.2 3.1 168 5.6 6.1 92 Divide Peak 8880 8.3 6.8 122 9.2 8.9 103 Elk River 8700 7.7 5.3 145 6.4 7.7 83 Little Snake River 8915 10.1 6.6 153 13.7 12.6 109 Old Battle 10000 12.6 10.9 116 12.0 14.0 86 Sage Creek Basin 7850 6.0 4.4 136 5.0 6.1 82 Sandstone RS 8150 6.6 3.8 174 6.3 7.4 85 Whiskey Park 8950 11.7 8.0 146 12.8 10.3 124 ----- ----- Basin Index (%) 139 97 UPPER GREEN RIVER Big Sandy Opening 9080 3.6 4.7 77 3.1 5.3 58 Blind Bull Sum 8650 8.1 7.8 104 5.1 7.9 65 East Rim Divide 7930 3.8 3.5 109 3.4 4.6 74 Elkhart Park G.S. 9400 3.8 4.5 84 4.1 5.4 76 Gros Ventre Summit 8750 4.1 4.8 85 4.1 5.3 77 Gunsight Pass 9820 4.8 4.4 109 5.1 5.4 94 Indian Creek 9425 7.6 8.5 89 6.2 8.3 75 Kendall R.S. 7740 3.5 3.9 90 3.7 5.4 69 Loomis Park 8240 4.7 5.1 92 7.5 6.7 112 New Fork Lake 8340 4.2 3.5 120 3.2 4.4 73 Pocket Creek 9360 -M -M * 2.7 -M * Snider Basin 8060 4.2 4.2 100 4.9 5.5 89 Spring Creek Divide 9000 7.6 8.1 94 7.7 9.2 84 Triple Peak 8500 8.6 7.1 121 8.7 9.3 94 ----- ----- Basin Index (%) 98 81 LOWER GREEN RIVER Blacks Fork Jct 8869 2.9 -M * 5.5 -M * Buck Pasture 9632 7.5 -M * 7.5 -M * EF Blacks Fork GS 9360 5.6 -M * 5.2 -M * Hams Fork 7840 3.7 3.5 106 4.6 4.4 105 Hewinta 9500 4.3 3.1 139 6.6 5.8 114 Hickerson Park 9122 5.3 2.1 252 6.1 4.5 136 Hole-in-Rock 9168 5.8 2.4 242 6.2 4.2 148 Indian Creek 9425 7.6 8.5 89 6.2 8.3 75 Kelley R.S. 8180 5.6 4.8 117 6.2 7.0 89 Spirit Lk 10235 7.9 -M * 8.8 -M * Steel Creek Park 10158 7.4 5.5 135 8.3 6.6 126 ----- ----- Basin Index (%) 133 108 UPPER BEAR RIVER Bear River RS 8777 3.6 -M * 5.0 -M * Bug Lake 7987 7.5 5.4 139 7.6 7.7 99 Burts Miller Ranch 8000 3.2 -M * 3.4 -M * Chalk Creek #1 9171 8.1 8.8 92 7.5 10.1 74 Hayden Fork 9130 6.0 4.5 133 8.7 8.2 106 Kelley R.S. 8180 5.6 4.8 117 6.2 7.0 89 Lily Lake 9133 4.6 4.5 102 5.5 7.1 77 Monte Cristo 8932 11.2 8.5 132 10.1 10.0 101 Salt River Summit 7640 4.5 3.7 122 5.2 6.2 84 Spring Creek Divide 9000 7.6 8.1 94 7.7 9.2 84 ----- ----- Basin Index (%) 114 89 ----------------------------------------------------------------------------- -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.