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: DECEMBER 25 , 2017 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 7.8 6.5 120 9.6 9.0 107 Black Bear 8170 16.7 15.5 108 15.9 16.0 99 Blind Bull Sum 8650 13.0 8.2 159 8.2 8.4 98 Cottonwood Creek 7670 7.0 7.6 92 8.5 10.1 84 East Rim Divide 7930 3.8 3.8 100 4.8 4.9 98 Grand Targhee 9260 23.1 15.9 145 13.7 13.7 100 Granite Creek 6770 6.0 5.3 113 9.1 8.3 110 Grassy Lake 7265 10.4 10.9 95 13.8 15.1 91 Gros Ventre Summit 8750 7.8 5.3 147 7.2 5.5 131 Gunsight Pass 9820 7.1 5.0 142 7.7 5.7 135 Lewis Lake Divide 7850 12.0 11.4 105 15.2 15.0 101 Phillips Bench 8200 9.0 9.5 95 10.6 11.4 93 Salt River Summit 7640 3.3 4.2 79 5.2 6.7 78 Snake River Station 6920 6.1 5.5 111 10.2 9.9 103 Spring Creek Divide 9000 9.2 8.5 108 9.6 9.7 99 Thumb Divide 7980 7.8 5.5 142 9.4 7.8 121 Togwotee Pass 9580 14.9 10.1 148 14.8 10.5 141 Two Ocean Plateau 9240 18.6 11.3 165 13.2 11.5 115 Willow Creek 8080 11.6 9.6 121 14.8 14.1 105 Younts Peak 8350 -M 6.2 * -M 6.9 * ----- ----- Basin Index (%) 122 104 MADISON-GALLATIN Black Bear 8170 16.7 15.5 108 15.9 16.0 99 Canyon 7870 5.9 4.8 123 7.6 7.1 107 Madison Plateau 7750 9.6 9.3 103 10.9 10.9 100 West Yellowstone 6700 4.6 4.0 115 7.3 6.2 118 Whiskey Creek 6800 5.3 5.8 91 6.9 8.8 78 ----- ----- Basin Index (%) 107 99 YELLOWSTONE Beartooth Lake 9360 15.2 9.0 169 13.2 8.2 161 Burnt Mtn 5880 2.2 1.9 116 7.6 6.4 119 Canyon 7870 5.9 4.8 123 7.6 7.1 107 Cole Creek 7850 7.2 5.9 122 5.1 6.2 82 Evening Star 9200 16.5 10.1 163 17.2 12.0 143 Fisher Creek 9100 21.1 13.6 155 17.7 13.6 130 Northeast Entrance 7350 3.6 3.2 112 6.9 5.7 121 Parker Peak 9400 15.1 8.8 172 12.8 7.8 164 Sylvan Lake 8420 11.2 8.4 133 11.6 10.3 113 Thumb Divide 7980 7.8 5.5 142 9.4 7.8 121 Two Ocean Plateau 9240 18.6 11.3 165 13.2 11.5 115 White Mill 8700 15.6 8.9 175 11.1 10.3 108 Wolverine 7650 5.4 4.2 129 8.7 5.7 153 ----- ----- Basin Index (%) 152 126 WIND RIVER Burroughs Creek 8750 6.2 -M * 7.7 -M * Castle Creek 8400 3.7 -M * 5.0 -M * Cold Springs 9630 4.6 3.0 153 5.1 4.6 111 Deer Park 9700 6.9 5.7 121 7.5 7.9 95 Hobbs Park 10100 10.0 6.1 164 8.2 5.8 141 Kirwin 9550 9.4 4.2 224 7.9 5.2 152 Little Warm 9370 8.7 4.1 212 8.6 5.7 151 Owl Creek 8975 2.3 2.3 100 3.9 2.7 144 South Pass 9040 5.8 5.8 100 4.6 7.6 61 St. Lawrence Alt 8620 2.9 2.8 104 5.4 4.1 132 Togwotee Pass 9580 14.9 10.1 148 14.8 10.5 141 Townsend Creek 8700 4.2 3.6 117 5.6 5.5 102 ----- ----- Basin Index (%) 146 120 BIGHORN BASIN Bald Mtn. 9380 8.8 7.5 117 5.6 7.3 77 Bear Trap Meadow 8200 3.5 2.4 146 4.9 4.0 122 Bone Springs Div 9350 6.8 6.9 99 5.2 6.6 79 Grave Springs 8550 2.8 3.0 93 2.7 4.7 57 Kirwin 9550 9.4 4.2 224 7.9 5.2 152 Marquette 8760 3.4 -M * 6.2 -M * Middle Powder 7760 4.1 4.6 89 3.0 5.8 52 Owl Creek 8975 2.3 2.3 100 3.9 2.7 144 Powder River Pass 9480 6.9 4.2 164 5.6 5.5 102 Shell Creek 9580 8.9 6.8 131 6.0 6.1 98 Timber Creek 7950 1.9 2.0 95 1.5 3.8 39 ----- ----- Basin Index (%) 126 90 SHOSHONE RIVER Blackwater 9780 16.3 9.7 168 13.9 9.2 151 Evening Star 9200 16.5 10.1 163 17.2 12.0 143 Marquette 8760 3.4 -M * 6.2 -M * Sylvan Road 7120 4.9 4.8 102 9.3 8.3 112 Younts Peak 8350 -M 6.2 * -M 6.9 * ----- ----- Basin Index (%) 153 137 POWDER RIVER Bear Trap Meadow 8200 3.5 2.4 146 4.9 4.0 122 Cloud Peak Reservoir 9860 5.7 5.6 102 6.0 5.9 102 Grave Springs 8550 2.8 3.0 93 2.7 4.7 57 Hansen Sawmill 8360 2.7 2.7 100 4.1 3.8 108 Middle Powder 7760 4.1 4.6 89 3.0 5.8 52 Powder River Pass 9480 6.9 4.2 164 5.6 5.5 102 Soldier Park 8720 1.4 -M * 4.0 -M * ----- ----- Basin Index (%) 114 89 TONGUE RIVER Big Goose 7990 2.5 3.4 74 3.3 5.1 65 Bone Springs Div 9350 6.8 6.9 99 5.2 6.6 79 Burgess Junction 7880 3.3 4.3 77 3.3 5.6 59 Dome Lake 8880 3.8 4.9 78 4.3 6.4 67 Little Goose 8870 3.3 -M * 5.0 -M * Sucker Creek 8880 3.8 4.7 81 -M 6.4 * Tie Creek 6870 1.1 1.6 69 2.4 5.3 45 ----- ----- Basin Index (%) 83 64 BELLE FOURCHE Cole Canyon 5910 1.7 1.5 113 3.7 4.4 84 ----- ----- Basin Index (%) 113 84 CHEYENNE RIVER BASIN Blind Park 6890 2.5 2.7 93 4.6 5.6 82 North Rapid Creek 6130 2.8 2.8 100 3.2 4.7 68 ----- ----- Basin Index (%) 96 76 UPPER N. PLATTE Arapaho Ridge 10960 7.7 8.7 89 8.0 10.0 80 Blackhall Mtn 9820 10.3 -M * 10.8 -M * Columbine 9160 4.5 8.0 56 9.6 10.7 90 Divide Peak 8880 5.2 7.5 69 8.5 9.5 89 Joe Wright 10120 6.4 8.9 72 12.1 11.4 106 Laprele Creek 8375 2.3 3.6 64 3.8 5.6 68 Med Bow 10500 14.7 -M * 13.0 -M * North French Creek 10130 10.2 10.6 96 10.9 11.1 98 Never Summer 10280 7.6 8.0 95 6.8 -M * Old Battle 10000 9.3 11.7 79 8.7 14.9 58 Rawah 9020 4.2 3.9 108 7.2 6.8 106 Sage Creek Basin 7850 3.6 5.1 71 5.2 6.6 79 Sand Lake 10050 11.1 10.5 106 9.4 10.4 90 South Brush Creek 8440 4.3 4.3 100 5.9 6.7 88 Tower 10500 -M 18.2 * -M 16.9 * Webber Springs 9250 6.4 8.8 73 8.7 11.4 76 Willow Creek Pass 9540 6.5 5.1 127 6.9 6.1 113 Zirkel 9340 6.7 8.6 78 11.5 12.4 93 ----- ----- Basin Index (%) 85 87 SWEETWATER Deer Park 9700 6.9 5.7 121 7.5 7.9 95 Larsen Creek 9000 2.9 4.4 66 5.4 -M * South Pass 9040 5.8 5.8 100 4.6 7.6 61 ----- ----- Basin Index (%) 98 78 LOWER N. PLATTE Casper Mtn. 7900 4.0 5.4 74 3.4 7.0 49 Laprele Creek 8375 2.3 3.6 64 3.8 5.6 68 Reno Hill 8400 4.6 5.4 85 5.7 6.6 86 Windy Peak 7900 2.0 2.9 69 3.6 4.8 75 ----- ----- Basin Index (%) 75 69 LARAMIE RIVER Brooklyn Lake 10240 8.0 7.3 110 9.2 8.5 108 Cinnabar Park 9574 9.0 7.8 115 11.3 10.3 110 Crow Creek 8330 .8 3.9 21 5.6 5.1 110 Deadman Hill 10220 8.9 6.8 131 9.0 7.3 123 Rawah 9020 4.2 3.9 108 7.2 6.8 106 Roach 9700 6.1 6.4 95 8.4 8.3 101 ----- ----- Basin Index (%) 102 110 S. PLATTE Black Mountain 8920 4.3 -M * 6.7 -M * Crow Creek 8330 .8 3.9 21 5.6 5.1 110 Deadman Hill 10220 8.9 6.8 131 9.0 7.3 123 ----- ----- Basin Index (%) 91 118 LITTLE SNAKE RIVER Battle Mountain 7440 1.4 3.4 41 4.3 6.5 66 Divide Peak 8880 5.2 7.5 69 8.5 9.5 89 Elk River 8700 4.7 5.9 80 6.8 8.3 82 Little Snake River 8915 6.1 7.7 79 10.8 13.5 80 Old Battle 10000 9.3 11.7 79 8.7 14.9 58 Sage Creek Basin 7850 3.6 5.1 71 5.2 6.6 79 Sandstone RS 8150 3.0 4.1 73 -M 7.9 * Whiskey Park 8950 6.7 8.6 78 9.7 11.0 88 ----- ----- Basin Index (%) 74 77 UPPER GREEN RIVER Big Sandy Opening 9080 5.7 5.1 112 6.0 5.7 105 Blind Bull Sum 8650 13.0 8.2 159 8.2 8.4 98 East Rim Divide 7930 3.8 3.8 100 4.8 4.9 98 Elkhart Park G.S. 9400 4.8 4.9 98 5.1 5.8 88 Gros Ventre Summit 8750 7.8 5.3 147 7.2 5.5 131 Gunsight Pass 9820 7.1 5.0 142 7.7 5.7 135 Kendall R.S. 7740 5.4 4.3 126 6.6 5.8 114 Loomis Park 8240 6.2 5.6 111 6.9 7.2 96 New Fork Lake 8340 4.6 4.0 115 4.2 4.6 91 Pocket Creek 9360 5.5 -M * 4.3 -M * Snider Basin 8060 3.9 4.6 85 6.1 5.9 103 Spring Creek Divide 9000 9.2 8.5 108 9.6 9.7 99 Triple Peak 8500 9.9 7.6 130 11.9 9.9 120 ----- ----- Basin Index (%) 122 107 LOWER GREEN RIVER Blacks Fork Jct 8869 3.2 -M * 4.2 -M * Buck Pasture 9632 5.0 -M * 5.7 -M * EF Blacks Fork GS 9360 3.0 -M * 3.8 -M * Hams Fork 7840 2.8 4.0 70 4.0 4.7 85 Hewinta 9500 2.6 3.3 79 5.0 6.1 82 Hickerson Park 9122 3.0 2.4 125 2.7 4.7 57 Hole-in-Rock 9168 2.5 2.8 89 3.1 4.4 70 Indian Creek 9425 7.9 9.5 83 6.1 8.8 69 Kelley R.S. 8180 4.6 5.6 82 5.8 7.5 77 Spirit Lk 10235 3.4 -M * 3.8 -M * Steel Creek Park 10158 5.4 5.8 93 5.9 7.0 84 ----- ----- Basin Index (%) 86 75 UPPER BEAR RIVER Bear River RS 8777 3.2 -M * 4.7 -M * Bug Lake 7987 5.1 5.8 88 7.6 8.2 93 Burts Miller Ranch 8000 2.0 -M * 3.0 -M * Chalk Creek #1 9171 6.0 9.4 64 6.8 10.7 64 Hayden Fork 9130 5.0 4.8 104 6.6 8.8 75 Kelley R.S. 8180 4.6 5.6 82 5.8 7.5 77 Lily Lake 9133 4.6 4.7 98 5.0 7.5 67 Monte Cristo 8932 8.8 9.1 97 8.7 10.7 81 Salt River Summit 7640 3.3 4.2 79 5.2 6.7 78 ----- ----- Basin Index (%) 86 76 ----------------------------------------------------------------------------- -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.