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 29 , 2017 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 8.1 6.9 117 9.9 9.6 103 Black Bear 8170 17.6 16.8 105 16.9 17.0 99 Blind Bull Sum 8650 14.2 8.8 161 8.8 8.9 99 Cottonwood Creek 7670 8.1 8.0 101 9.7 10.7 91 East Rim Divide 7930 4.6 4.2 110 5.3 5.3 100 Grand Targhee 9260 23.7 17.2 138 14.2 14.6 97 Granite Creek 6770 6.6 6.0 110 9.6 9.0 107 Grassy Lake 7265 11.0 11.9 92 14.5 16.2 90 Gros Ventre Summit 8750 8.1 5.9 137 7.5 5.9 127 Gunsight Pass 9820 7.6 5.8 131 8.2 6.1 134 Lewis Lake Divide 7850 12.9 12.6 102 16.0 16.1 99 Phillips Bench 8200 9.6 10.4 92 11.0 12.2 90 Salt River Summit 7640 3.7 4.6 80 5.7 7.2 79 Snake River Station 6920 6.6 5.8 114 10.8 10.5 103 Spring Creek Divide 9000 10.3 9.4 110 10.6 10.4 102 Thumb Divide 7980 8.4 5.9 142 9.9 8.3 119 Togwotee Pass 9580 15.8 10.6 149 15.8 11.0 144 Two Ocean Plateau 9240 19.4 12.0 162 13.8 12.1 114 Willow Creek 8080 12.6 10.2 124 15.7 15.0 105 Younts Peak 8350 -M 6.8 * -M 7.4 * ----- ----- Basin Index (%) 121 104 MADISON-GALLATIN Black Bear 8170 17.6 16.8 105 16.9 17.0 99 Canyon 7870 6.6 5.1 129 8.4 7.5 112 Madison Plateau 7750 10.1 9.9 102 11.3 11.8 96 West Yellowstone 6700 5.1 4.4 116 7.7 6.7 115 Whiskey Creek 6800 5.8 6.2 94 6.9 9.3 74 ----- ----- Basin Index (%) 107 98 YELLOWSTONE Beartooth Lake 9360 17.4 9.6 181 15.4 8.8 175 Burnt Mtn 5880 2.7 1.9 142 8.1 6.6 123 Canyon 7870 6.6 5.1 129 8.4 7.5 112 Cole Creek 7850 7.9 6.2 127 5.7 6.3 90 Evening Star 9200 18.5 10.7 173 19.5 12.6 155 Fisher Creek 9100 24.0 14.1 170 19.8 14.4 138 Northeast Entrance 7350 4.4 3.7 119 7.8 5.9 132 Parker Peak 9400 16.5 9.4 176 -M 8.2 * Sylvan Lake 8420 12.1 8.9 136 12.7 10.8 118 Thumb Divide 7980 8.4 5.9 142 9.9 8.3 119 Two Ocean Plateau 9240 19.4 12.0 162 13.8 12.1 114 White Mill 8700 17.9 9.4 190 12.9 10.8 119 Wolverine 7650 7.3 4.5 162 10.1 6.0 168 ----- ----- Basin Index (%) 161 131 WIND RIVER Burroughs Creek 8750 7.0 -M * 8.5 -M * Castle Creek 8400 4.3 -M * 5.7 -M * Cold Springs 9630 5.1 3.0 170 5.5 4.8 115 Deer Park 9700 6.4 6.6 97 7.7 8.4 92 Hobbs Park 10100 10.4 6.3 165 8.5 6.0 142 Kirwin 9550 10.6 4.2 252 9.3 5.4 172 Little Warm 9370 9.2 4.3 214 9.0 6.0 150 Owl Creek 8975 2.5 2.4 104 4.1 2.8 146 South Pass 9040 6.1 6.3 97 4.9 8.1 60 St. Lawrence Alt 8620 3.0 2.9 103 5.5 4.2 131 Togwotee Pass 9580 15.8 10.6 149 15.8 11.0 144 Townsend Creek 8700 4.4 3.9 113 5.9 5.7 104 ----- ----- Basin Index (%) 146 122 BIGHORN BASIN Bald Mtn. 9380 9.5 8.0 119 6.2 7.6 82 Bear Trap Meadow 8200 3.9 2.5 156 5.0 4.2 119 Bone Springs Div 9350 7.7 7.1 108 6.0 6.9 87 Grave Springs 8550 3.0 3.2 94 2.9 4.9 59 Kirwin 9550 10.6 4.2 252 9.3 5.4 172 Marquette 8760 3.6 -M * 6.4 -M * Middle Powder 7760 4.3 4.8 90 3.4 6.0 57 Owl Creek 8975 2.5 2.4 104 4.1 2.8 146 Powder River Pass 9480 7.3 4.5 162 6.2 5.7 109 Shell Creek 9580 9.9 7.0 141 6.7 6.4 105 Timber Creek 7950 2.1 2.1 100 1.9 3.9 49 ----- ----- Basin Index (%) 133 96 SHOSHONE RIVER Blackwater 9780 18.0 10.2 176 15.6 9.6 162 Evening Star 9200 18.5 10.7 173 19.5 12.6 155 Marquette 8760 3.6 -M * 6.4 -M * Sylvan Road 7120 5.8 5.1 114 10.1 8.7 116 Younts Peak 8350 -M 6.8 * -M 7.4 * ----- ----- Basin Index (%) 163 146 POWDER RIVER Bear Trap Meadow 8200 3.9 2.5 156 5.0 4.2 119 Cloud Peak Reservoir 9860 6.4 6.0 107 6.6 6.1 108 Grave Springs 8550 3.0 3.2 94 2.9 4.9 59 Hansen Sawmill 8360 3.3 2.9 114 4.6 4.0 115 Middle Powder 7760 4.3 4.8 90 3.4 6.0 57 Powder River Pass 9480 7.3 4.5 162 6.2 5.7 109 Soldier Park 8720 2.1 -M * 4.5 -M * ----- ----- Basin Index (%) 118 93 TONGUE RIVER Big Goose 7990 3.1 3.6 86 3.7 5.2 71 Bone Springs Div 9350 7.7 7.1 108 6.0 6.9 87 Burgess Junction 7880 3.8 4.6 83 3.9 5.8 67 Dome Lake 8880 4.6 5.2 88 4.6 6.6 70 Little Goose 8870 3.7 -M * 5.6 -M * Sucker Creek 8880 4.2 5.0 84 3.3 6.6 50 Tie Creek 6870 1.5 1.9 79 4.5 5.5 82 ----- ----- Basin Index (%) 91 71 BELLE FOURCHE Cole Canyon 5910 2.1 2.0 105 4.1 4.6 89 ----- ----- Basin Index (%) 105 89 CHEYENNE RIVER BASIN Blind Park 6890 2.9 3.1 94 4.9 5.8 84 North Rapid Creek 6130 3.4 3.1 110 3.7 4.9 76 ----- ----- Basin Index (%) 102 80 UPPER N. PLATTE Arapaho Ridge 10960 8.6 9.1 95 8.7 10.4 84 Blackhall Mtn 9820 11.2 -M * 11.7 -M * Columbine 9160 5.1 8.4 61 10.5 11.2 94 Divide Peak 8880 5.7 8.1 70 9.0 10.0 90 Joe Wright 10120 7.0 9.2 76 13.3 11.8 113 Laprele Creek 8375 2.5 3.8 66 4.0 5.8 69 Med Bow 10500 16.9 -M * 14.8 -M * North French Creek 10130 11.8 11.1 106 12.5 11.6 108 Never Summer 10280 8.1 8.4 96 7.1 -M * Old Battle 10000 9.9 12.2 81 9.5 15.7 61 Rawah 9020 4.7 4.1 115 7.9 7.1 111 Sage Creek Basin 7850 3.9 5.5 71 5.4 7.0 77 Sand Lake 10050 12.2 11.2 109 10.3 10.9 94 South Brush Creek 8440 4.6 4.5 102 6.3 7.0 90 Tower 10500 12.3 18.4 67 13.7 17.8 77 Webber Springs 9250 7.0 9.2 76 9.1 12.0 76 Willow Creek Pass 9540 6.6 5.3 125 7.1 6.3 113 Zirkel 9340 8.0 9.4 85 12.9 12.8 101 ----- ----- Basin Index (%) 86 89 SWEETWATER Deer Park 9700 6.4 6.6 97 7.7 8.4 92 Larsen Creek 9000 3.2 4.7 68 5.7 -M * South Pass 9040 6.1 6.3 97 4.9 8.1 60 ----- ----- Basin Index (%) 89 76 LOWER N. PLATTE Casper Mtn. 7900 4.0 5.6 71 3.7 7.3 51 Laprele Creek 8375 2.5 3.8 66 4.0 5.8 69 Reno Hill 8400 4.8 5.6 86 5.9 6.9 86 Windy Peak 7900 2.2 3.0 73 3.9 5.1 76 ----- ----- Basin Index (%) 75 70 LARAMIE RIVER Brooklyn Lake 10240 9.9 7.6 130 11.0 8.9 124 Cinnabar Park 9574 10.5 8.5 124 12.8 10.9 117 Crow Creek 8330 1.0 4.2 24 5.9 5.4 109 Deadman Hill 10220 9.9 7.0 141 9.9 7.6 130 Rawah 9020 4.7 4.1 115 7.9 7.1 111 Roach 9700 6.8 6.8 100 9.1 8.7 105 ----- ----- Basin Index (%) 112 116 S. PLATTE Black Mountain 8920 4.6 -M * 6.9 -M * Crow Creek 8330 1.0 4.2 24 5.9 5.4 109 Deadman Hill 10220 9.9 7.0 141 9.9 7.6 130 ----- ----- Basin Index (%) 97 122 LITTLE SNAKE RIVER Battle Mountain 7440 1.5 3.7 41 4.5 6.7 67 Divide Peak 8880 5.7 8.1 70 9.0 10.0 90 Elk River 8700 5.3 6.4 83 7.3 8.8 83 Little Snake River 8915 6.8 8.6 79 11.6 14.1 82 Old Battle 10000 9.9 12.2 81 9.5 15.7 61 Sage Creek Basin 7850 3.9 5.5 71 5.4 7.0 77 Sandstone RS 8150 3.1 4.2 74 -M 8.2 * Whiskey Park 8950 7.3 9.1 80 10.3 11.5 90 ----- ----- Basin Index (%) 75 78 UPPER GREEN RIVER Big Sandy Opening 9080 6.1 5.6 109 6.4 6.0 107 Blind Bull Sum 8650 14.2 8.8 161 8.8 8.9 99 East Rim Divide 7930 4.6 4.2 110 5.3 5.3 100 Elkhart Park G.S. 9400 5.6 5.5 102 5.7 6.2 92 Gros Ventre Summit 8750 8.1 5.9 137 7.5 5.9 127 Gunsight Pass 9820 7.6 5.8 131 8.2 6.1 134 Kendall R.S. 7740 6.6 4.6 143 7.6 6.2 123 Loomis Park 8240 7.0 6.2 113 7.6 7.8 97 New Fork Lake 8340 5.6 4.4 127 -M 5.0 * Pocket Creek 9360 5.7 -M * 4.6 -M * Snider Basin 8060 4.8 4.9 98 6.9 6.3 110 Spring Creek Divide 9000 10.3 9.4 110 10.6 10.4 102 Triple Peak 8500 11.1 7.9 141 13.1 10.5 125 ----- ----- Basin Index (%) 125 110 LOWER GREEN RIVER Blacks Fork Jct 8869 3.4 -M * 4.5 -M * Buck Pasture 9632 5.5 -M * 6.1 -M * EF Blacks Fork GS 9360 3.2 -M * 4.0 -M * Hams Fork 7840 3.3 4.4 75 4.3 5.0 86 Hewinta 9500 3.0 3.6 83 5.4 6.2 87 Hickerson Park 9122 3.0 2.7 111 2.8 4.8 58 Hole-in-Rock 9168 2.6 2.9 90 3.2 4.6 70 Indian Creek 9425 8.6 9.9 87 6.6 9.4 70 Kelley R.S. 8180 5.1 6.0 85 6.2 8.1 77 Spirit Lk 10235 3.4 -M * 3.8 -M * Steel Creek Park 10158 -M 6.1 * 6.4 7.3 88 ----- ----- Basin Index (%) 87 77 UPPER BEAR RIVER Bear River RS 8777 3.4 -M * 4.9 -M * Bug Lake 7987 5.4 6.1 89 7.8 8.6 91 Burts Miller Ranch 8000 2.2 -M * 3.1 -M * Chalk Creek #1 9171 6.3 9.5 66 7.1 11.1 64 Hayden Fork 9130 5.4 5.5 98 7.0 9.2 76 Kelley R.S. 8180 5.1 6.0 85 6.2 8.1 77 Lily Lake 9133 4.9 4.9 100 5.3 7.8 68 Monte Cristo 8932 9.0 9.7 93 9.0 11.3 80 Salt River Summit 7640 3.7 4.6 80 5.7 7.2 79 ----- ----- 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.