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 WEDNESDAY: DECEMBER 27 , 2017 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 7.9 6.7 118 9.8 9.3 105 Black Bear 8170 17.1 16.1 106 16.3 16.5 99 Blind Bull Sum 8650 13.8 8.4 164 8.6 8.6 100 Cottonwood Creek 7670 7.9 7.8 101 9.4 10.4 90 East Rim Divide 7930 4.2 4.0 105 5.1 5.1 100 Grand Targhee 9260 23.6 16.6 142 14.0 14.1 99 Granite Creek 6770 6.4 5.7 112 9.4 8.6 109 Grassy Lake 7265 10.8 11.4 95 14.3 15.6 92 Gros Ventre Summit 8750 8.0 5.6 143 7.2 5.7 126 Gunsight Pass 9820 7.3 5.4 135 7.9 5.9 134 Lewis Lake Divide 7850 12.4 12.1 102 15.7 15.5 101 Phillips Bench 8200 9.3 9.9 94 10.9 11.8 92 Salt River Summit 7640 3.6 4.4 82 5.5 6.9 80 Snake River Station 6920 6.2 5.7 109 10.4 10.2 102 Spring Creek Divide 9000 10.1 8.9 113 10.3 10.0 103 Thumb Divide 7980 8.0 5.7 140 9.6 8.0 120 Togwotee Pass 9580 15.5 10.3 150 15.4 10.7 144 Two Ocean Plateau 9240 18.9 11.6 163 13.5 11.8 114 Willow Creek 8080 12.3 9.9 124 15.5 14.5 107 Younts Peak 8350 -M 6.5 * -M 7.1 * ----- ----- Basin Index (%) 122 105 MADISON-GALLATIN Black Bear 8170 17.1 16.1 106 16.3 16.5 99 Canyon 7870 6.1 4.9 124 7.8 7.3 107 Madison Plateau 7750 9.8 9.6 102 11.0 11.3 97 West Yellowstone 6700 4.7 4.2 112 7.5 6.4 117 Whiskey Creek 6800 5.5 5.9 93 7.1 9.0 79 ----- ----- Basin Index (%) 106 98 YELLOWSTONE Beartooth Lake 9360 15.8 9.3 170 13.8 8.5 162 Burnt Mtn 5880 2.5 1.9 132 7.9 6.6 120 Canyon 7870 6.1 4.9 124 7.8 7.3 107 Cole Creek 7850 7.5 6.0 125 5.3 6.2 85 Evening Star 9200 17.0 10.4 163 18.0 12.3 146 Fisher Creek 9100 21.9 13.8 159 18.4 13.9 132 Northeast Entrance 7350 3.8 3.4 112 7.3 5.8 126 Parker Peak 9400 15.5 9.1 170 13.2 8.0 165 Sylvan Lake 8420 11.5 8.6 134 12.0 10.5 114 Thumb Divide 7980 8.0 5.7 140 9.6 8.0 120 Two Ocean Plateau 9240 18.9 11.6 163 13.5 11.8 114 White Mill 8700 16.1 9.2 175 11.5 10.5 110 Wolverine 7650 5.9 4.4 134 9.1 5.9 154 ----- ----- Basin Index (%) 153 128 WIND RIVER Burroughs Creek 8750 6.4 -M * 7.8 -M * Castle Creek 8400 3.8 -M * 5.1 -M * Cold Springs 9630 4.7 3.0 157 5.2 4.7 111 Deer Park 9700 6.8 6.2 110 7.5 8.2 91 Hobbs Park 10100 10.1 6.2 163 8.3 5.9 141 Kirwin 9550 9.8 4.2 233 8.4 5.3 158 Little Warm 9370 8.9 4.2 212 8.7 5.8 150 Owl Creek 8975 2.3 2.4 96 4.0 2.8 143 South Pass 9040 5.9 6.1 97 4.6 7.9 58 St. Lawrence Alt 8620 2.8 2.9 97 5.4 4.2 129 Togwotee Pass 9580 15.5 10.3 150 15.4 10.7 144 Townsend Creek 8700 4.2 3.8 111 5.7 5.6 102 ----- ----- Basin Index (%) 144 120 BIGHORN BASIN Bald Mtn. 9380 9.0 7.7 117 5.8 7.5 77 Bear Trap Meadow 8200 3.7 2.5 148 5.0 4.1 122 Bone Springs Div 9350 6.9 7.0 99 5.3 6.8 78 Grave Springs 8550 2.9 3.1 94 2.7 4.9 55 Kirwin 9550 9.8 4.2 233 8.4 5.3 158 Marquette 8760 3.7 -M * 6.4 -M * Middle Powder 7760 4.3 4.7 91 3.1 5.9 53 Owl Creek 8975 2.3 2.4 96 4.0 2.8 143 Powder River Pass 9480 7.0 4.4 159 5.7 5.6 102 Shell Creek 9580 9.1 6.9 132 6.1 6.3 97 Timber Creek 7950 2.0 2.0 100 1.5 3.8 39 ----- ----- Basin Index (%) 127 90 SHOSHONE RIVER Blackwater 9780 16.8 10.0 168 14.4 9.4 153 Evening Star 9200 17.0 10.4 163 18.0 12.3 146 Marquette 8760 3.7 -M * 6.4 -M * Sylvan Road 7120 5.3 5.0 106 9.6 8.5 113 Younts Peak 8350 -M 6.5 * -M 7.1 * ----- ----- Basin Index (%) 154 139 POWDER RIVER Bear Trap Meadow 8200 3.7 2.5 148 5.0 4.1 122 Cloud Peak Reservoir 9860 5.8 5.8 100 6.1 6.1 100 Grave Springs 8550 2.9 3.1 94 2.7 4.9 55 Hansen Sawmill 8360 2.9 2.8 104 4.2 3.9 108 Middle Powder 7760 4.3 4.7 91 3.1 5.9 53 Powder River Pass 9480 7.0 4.4 159 5.7 5.6 102 Soldier Park 8720 1.7 -M * 4.2 -M * ----- ----- Basin Index (%) 114 88 TONGUE RIVER Big Goose 7990 2.7 3.5 77 3.5 5.2 67 Bone Springs Div 9350 6.9 7.0 99 5.3 6.8 78 Burgess Junction 7880 3.4 4.5 76 3.5 5.7 61 Dome Lake 8880 3.9 5.0 78 4.3 6.5 66 Little Goose 8870 3.3 -M * 5.1 -M * Sucker Creek 8880 3.9 4.8 81 -M 6.5 * Tie Creek 6870 1.3 1.8 72 4.1 5.4 76 ----- ----- Basin Index (%) 83 70 BELLE FOURCHE Cole Canyon 5910 1.8 1.8 100 3.9 4.5 87 ----- ----- Basin Index (%) 100 87 CHEYENNE RIVER BASIN Blind Park 6890 2.6 2.9 90 4.7 5.7 82 North Rapid Creek 6130 2.9 2.9 100 3.3 4.8 69 ----- ----- Basin Index (%) 95 76 UPPER N. PLATTE Arapaho Ridge 10960 8.5 8.9 96 8.6 10.2 84 Blackhall Mtn 9820 11.2 -M * 11.6 -M * Columbine 9160 4.9 8.2 60 -M 10.9 * Divide Peak 8880 5.7 7.8 73 9.0 9.8 92 Joe Wright 10120 7.1 9.0 79 13.3 11.6 115 Laprele Creek 8375 2.3 3.7 62 3.8 5.7 67 Med Bow 10500 16.8 -M * 14.7 -M * North French Creek 10130 11.8 10.8 109 12.5 11.4 110 Never Summer 10280 8.0 8.2 98 7.0 -M * Old Battle 10000 9.8 12.0 82 9.3 15.4 60 Rawah 9020 4.7 4.0 118 7.7 7.0 110 Sage Creek Basin 7850 3.7 5.2 71 5.4 6.8 79 Sand Lake 10050 12.0 10.8 111 10.1 10.6 95 South Brush Creek 8440 4.5 4.4 102 6.2 6.9 90 Tower 10500 -M 18.3 * -M 17.3 * Webber Springs 9250 6.9 9.0 77 9.1 11.7 78 Willow Creek Pass 9540 6.6 5.2 127 7.0 6.2 113 Zirkel 9340 7.9 8.9 89 12.8 12.6 102 ----- ----- Basin Index (%) 90 91 SWEETWATER Deer Park 9700 6.8 6.2 110 7.5 8.2 91 Larsen Creek 9000 3.0 4.5 67 5.6 -M * South Pass 9040 5.9 6.1 97 4.6 7.9 58 ----- ----- Basin Index (%) 93 75 LOWER N. PLATTE Casper Mtn. 7900 4.0 5.5 73 3.4 7.1 48 Laprele Creek 8375 2.3 3.7 62 3.8 5.7 67 Reno Hill 8400 4.5 5.5 82 5.6 6.8 82 Windy Peak 7900 2.0 3.0 67 3.6 5.0 72 ----- ----- Basin Index (%) 72 67 LARAMIE RIVER Brooklyn Lake 10240 9.8 7.4 132 10.9 8.8 124 Cinnabar Park 9574 10.4 8.1 128 12.7 10.6 120 Crow Creek 8330 1.0 4.0 25 5.8 5.3 109 Deadman Hill 10220 9.8 6.9 142 9.8 7.4 132 Rawah 9020 4.7 4.0 118 7.7 7.0 110 Roach 9700 6.7 6.6 102 9.0 8.5 106 ----- ----- Basin Index (%) 115 117 S. PLATTE Black Mountain 8920 4.5 -M * 6.9 -M * Crow Creek 8330 1.0 4.0 25 5.8 5.3 109 Deadman Hill 10220 9.8 6.9 142 9.8 7.4 132 ----- ----- Basin Index (%) 99 123 LITTLE SNAKE RIVER Battle Mountain 7440 1.6 3.5 46 -M 6.6 * Divide Peak 8880 5.7 7.8 73 9.0 9.8 92 Elk River 8700 5.2 6.1 85 7.2 8.6 84 Little Snake River 8915 6.6 8.1 81 11.4 13.8 83 Old Battle 10000 9.8 12.0 82 9.3 15.4 60 Sage Creek Basin 7850 3.7 5.2 71 5.4 6.8 79 Sandstone RS 8150 3.2 4.1 78 -M 8.1 * Whiskey Park 8950 7.3 8.8 83 10.2 11.3 90 ----- ----- Basin Index (%) 78 80 UPPER GREEN RIVER Big Sandy Opening 9080 5.9 5.3 111 6.2 5.9 105 Blind Bull Sum 8650 13.8 8.4 164 8.6 8.6 100 East Rim Divide 7930 4.2 4.0 105 5.1 5.1 100 Elkhart Park G.S. 9400 5.0 5.2 96 5.2 6.0 87 Gros Ventre Summit 8750 8.0 5.6 143 7.2 5.7 126 Gunsight Pass 9820 7.3 5.4 135 7.9 5.9 134 Kendall R.S. 7740 5.6 4.4 127 6.7 6.0 112 Loomis Park 8240 6.5 5.9 110 7.2 7.5 96 New Fork Lake 8340 4.8 4.2 114 4.1 4.8 85 Pocket Creek 9360 5.5 -M * 4.4 -M * Snider Basin 8060 4.6 4.8 96 6.7 6.1 110 Spring Creek Divide 9000 10.1 8.9 113 10.3 10.0 103 Triple Peak 8500 10.7 7.7 139 12.8 10.2 125 ----- ----- Basin Index (%) 124 108 LOWER GREEN RIVER Blacks Fork Jct 8869 3.3 -M * 4.6 -M * Buck Pasture 9632 5.4 -M * 6.2 -M * EF Blacks Fork GS 9360 3.2 -M * 4.0 -M * Hams Fork 7840 3.2 4.2 76 4.2 4.8 88 Hewinta 9500 2.9 3.4 85 5.4 6.2 87 Hickerson Park 9122 3.0 2.6 115 2.4 4.8 50 Hole-in-Rock 9168 2.5 2.8 89 3.2 4.5 71 Indian Creek 9425 8.5 9.7 88 6.4 9.1 70 Kelley R.S. 8180 4.9 5.8 84 6.0 7.8 77 Spirit Lk 10235 3.3 -M * 3.8 -M * Steel Creek Park 10158 6.4 6.0 107 6.4 7.1 90 ----- ----- Basin Index (%) 91 77 UPPER BEAR RIVER Bear River RS 8777 3.3 -M * 4.9 -M * Bug Lake 7987 5.2 5.9 88 7.8 8.4 93 Burts Miller Ranch 8000 2.1 -M * 3.0 -M * Chalk Creek #1 9171 6.3 9.4 67 7.2 11.0 65 Hayden Fork 9130 5.4 5.1 106 7.0 9.0 78 Kelley R.S. 8180 4.9 5.8 84 6.0 7.8 77 Lily Lake 9133 4.8 4.8 100 5.4 7.7 70 Monte Cristo 8932 9.1 9.4 97 8.9 11.0 81 Salt River Summit 7640 3.6 4.4 82 5.5 6.9 80 ----- ----- Basin Index (%) 88 77 ----------------------------------------------------------------------------- -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.