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 20 , 2017 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 7.0 5.8 121 8.9 8.5 105 Black Bear 8170 14.7 14.2 104 14.0 15.1 93 Blind Bull Sum 8650 11.6 7.8 149 7.7 7.9 97 Cottonwood Creek 7670 5.6 7.0 80 7.3 9.5 77 East Rim Divide 7930 3.4 3.5 97 4.3 4.6 93 Grand Targhee 9260 21.4 14.3 150 13.1 12.7 103 Granite Creek 6770 5.3 4.7 113 8.4 7.8 108 Grassy Lake 7265 8.8 10.0 88 12.4 13.9 89 Gros Ventre Summit 8750 7.2 4.8 150 6.6 5.3 125 Gunsight Pass 9820 6.6 4.4 150 7.2 5.4 133 Lewis Lake Divide 7850 10.6 10.2 104 13.8 14.0 99 Phillips Bench 8200 8.1 8.7 93 9.6 10.6 91 Salt River Summit 7640 2.5 3.7 68 4.4 6.2 71 Snake River Station 6920 5.2 5.2 100 9.4 9.3 101 Spring Creek Divide 9000 7.8 8.1 96 8.4 9.2 91 Thumb Divide 7980 7.3 5.0 146 8.9 7.4 120 Togwotee Pass 9580 13.7 9.4 146 13.5 9.9 136 Two Ocean Plateau 9240 17.5 10.8 162 12.2 10.9 112 Willow Creek 8080 9.7 8.8 110 13.0 13.2 98 Younts Peak 8350 -M 5.7 * -M 6.6 * ----- ----- Basin Index (%) 119 101 MADISON-GALLATIN Black Bear 8170 14.7 14.2 104 14.0 15.1 93 Canyon 7870 5.0 4.3 116 6.7 6.6 102 Madison Plateau 7750 8.5 8.5 100 9.8 10.3 95 West Yellowstone 6700 3.9 3.6 108 6.5 5.9 110 Whiskey Creek 6800 4.5 5.2 87 5.7 8.3 69 ----- ----- Basin Index (%) 102 92 YELLOWSTONE Beartooth Lake 9360 14.1 8.4 168 12.4 7.7 161 Burnt Mtn 5880 1.6 1.7 94 6.8 6.2 110 Canyon 7870 5.0 4.3 116 6.7 6.6 102 Cole Creek 7850 6.7 5.6 120 4.8 5.9 81 Evening Star 9200 15.7 9.4 167 16.3 11.3 144 Fisher Creek 9100 19.6 12.6 156 16.3 12.7 128 Northeast Entrance 7350 3.2 2.8 114 6.6 5.3 125 Parker Peak 9400 14.3 8.3 172 11.9 7.5 159 Sylvan Lake 8420 10.6 7.7 138 10.9 9.6 114 Thumb Divide 7980 7.3 5.0 146 8.9 7.4 120 Two Ocean Plateau 9240 17.5 10.8 162 12.2 10.9 112 White Mill 8700 14.6 8.5 172 10.2 9.6 106 Wolverine 7650 4.4 3.6 122 8.1 5.5 147 ----- ----- Basin Index (%) 152 124 WIND RIVER Burroughs Creek 8750 5.7 -M * 7.2 -M * Castle Creek 8400 3.4 -M * 4.9 -M * Cold Springs 9630 3.9 2.8 139 4.4 4.5 98 Deer Park 9700 6.2 5.2 119 6.9 7.4 93 Hobbs Park 10100 9.3 5.9 158 7.5 5.5 136 Kirwin 9550 9.1 4.1 222 7.6 5.0 152 Little Warm 9370 8.0 3.8 211 7.6 5.4 141 Owl Creek 8975 2.2 2.3 96 3.8 2.6 146 South Pass 9040 5.3 5.5 96 4.2 7.2 58 St. Lawrence Alt 8620 2.9 2.5 116 5.1 3.9 131 Togwotee Pass 9580 13.7 9.4 146 13.5 9.9 136 Townsend Creek 8700 3.9 3.3 118 5.1 5.2 98 ----- ----- Basin Index (%) 144 116 BIGHORN BASIN Bald Mtn. 9380 8.3 7.1 117 5.3 6.8 78 Bear Trap Meadow 8200 3.6 2.2 164 4.7 3.8 124 Bone Springs Div 9350 6.4 6.4 100 5.2 6.2 84 Grave Springs 8550 2.7 2.7 100 2.5 4.4 57 Kirwin 9550 9.1 4.1 222 7.6 5.0 152 Marquette 8760 3.3 -M * 5.8 -M * Middle Powder 7760 3.8 4.0 95 3.0 5.5 55 Owl Creek 8975 2.2 2.3 96 3.8 2.6 146 Powder River Pass 9480 6.5 3.9 167 5.6 5.1 110 Shell Creek 9580 8.8 6.3 140 5.7 5.8 98 Timber Creek 7950 1.8 1.9 95 1.4 3.6 39 ----- ----- Basin Index (%) 130 92 SHOSHONE RIVER Blackwater 9780 15.5 9.2 168 13.0 8.8 148 Evening Star 9200 15.7 9.4 167 16.3 11.3 144 Marquette 8760 3.3 -M * 5.8 -M * Sylvan Road 7120 4.5 4.3 105 8.5 7.9 108 Younts Peak 8350 -M 5.7 * -M 6.6 * ----- ----- Basin Index (%) 156 135 POWDER RIVER Bear Trap Meadow 8200 3.6 2.2 164 4.7 3.8 124 Cloud Peak Reservoir 9860 5.4 5.1 106 6.2 5.6 111 Grave Springs 8550 2.7 2.7 100 2.5 4.4 57 Hansen Sawmill 8360 2.8 2.4 117 4.0 3.7 108 Middle Powder 7760 3.8 4.0 95 3.0 5.5 55 Powder River Pass 9480 6.5 3.9 167 5.6 5.1 110 Soldier Park 8720 1.7 -M * 4.2 -M * ----- ----- Basin Index (%) 122 93 TONGUE RIVER Big Goose 7990 2.7 3.1 87 3.4 4.7 72 Bone Springs Div 9350 6.4 6.4 100 5.2 6.2 84 Burgess Junction 7880 3.2 4.0 80 3.2 5.2 62 Dome Lake 8880 3.9 4.6 85 4.1 6.1 67 Little Goose 8870 3.2 -M * 5.1 -M * Sucker Creek 8880 3.8 4.2 90 -M 6.0 * Tie Creek 6870 1.1 1.2 92 4.7 4.9 96 ----- ----- Basin Index (%) 90 76 BELLE FOURCHE Cole Canyon 5910 1.7 1.0 170 3.6 4.1 88 ----- ----- Basin Index (%) 170 88 CHEYENNE RIVER BASIN Blind Park 6890 2.7 2.3 117 4.5 5.2 87 North Rapid Creek 6130 2.9 2.5 116 3.4 4.4 77 ----- ----- Basin Index (%) 117 82 UPPER N. PLATTE Arapaho Ridge 10960 6.1 8.0 76 6.4 9.4 68 Blackhall Mtn 9820 8.3 -M * 8.8 -M * Columbine 9160 3.3 7.3 45 7.0 9.9 71 Divide Peak 8880 4.1 6.8 60 7.3 8.9 82 Joe Wright 10120 5.7 8.3 69 11.0 10.6 104 Laprele Creek 8375 2.1 3.2 66 3.5 5.2 67 Med Bow 10500 11.8 -M * 10.5 -M * North French Creek 10130 8.5 10.0 85 9.4 10.4 90 Never Summer 10280 6.7 7.2 93 6.3 -M * Old Battle 10000 7.6 10.9 70 7.2 14.0 51 Rawah 9020 3.7 3.7 100 6.9 6.4 108 Sage Creek Basin 7850 2.6 4.4 59 4.1 6.1 67 Sand Lake 10050 9.3 9.7 96 8.2 9.8 84 South Brush Creek 8440 3.7 4.1 90 5.3 6.3 84 Tower 10500 9.2 17.1 54 10.9 15.9 69 Webber Springs 9250 5.1 8.2 62 7.3 10.7 68 Willow Creek Pass 9540 5.4 4.8 112 5.8 5.7 102 Zirkel 9340 5.1 7.8 65 9.9 11.7 85 ----- ----- Basin Index (%) 73 78 SWEETWATER Deer Park 9700 6.2 5.2 119 6.9 7.4 93 Larsen Creek 9000 2.6 4.0 65 4.7 -M * South Pass 9040 5.3 5.5 96 4.2 7.2 58 ----- ----- Basin Index (%) 96 76 LOWER N. PLATTE Casper Mtn. 7900 3.4 5.0 68 3.1 6.6 47 Laprele Creek 8375 2.1 3.2 66 3.5 5.2 67 Reno Hill 8400 4.5 5.1 88 5.4 6.3 86 Windy Peak 7900 1.6 2.7 59 3.4 4.6 74 ----- ----- Basin Index (%) 72 68 LARAMIE RIVER Brooklyn Lake 10240 5.7 6.9 83 7.3 7.9 92 Cinnabar Park 9574 7.0 7.5 93 9.1 9.8 93 Crow Creek 8330 -M 3.8 * 4.6 4.6 100 Deadman Hill 10220 7.9 6.1 130 8.2 6.7 122 Rawah 9020 3.7 3.7 100 6.9 6.4 108 Roach 9700 5.2 5.6 93 7.5 7.7 97 ----- ----- Basin Index (%) 99 101 S. PLATTE Black Mountain 8920 3.9 -M * 6.2 -M * Crow Creek 8330 -M 3.8 * 4.6 4.6 100 Deadman Hill 10220 7.9 6.1 130 8.2 6.7 122 ----- ----- Basin Index (%) 130* 113 LITTLE SNAKE RIVER Battle Mountain 7440 .9 3.1 29 4.2 6.1 69 Divide Peak 8880 4.1 6.8 60 7.3 8.9 82 Elk River 8700 3.6 5.3 68 6.0 7.7 78 Little Snake River 8915 4.3 6.6 65 8.9 12.6 71 Old Battle 10000 7.6 10.9 70 7.2 14.0 51 Sage Creek Basin 7850 2.6 4.4 59 4.1 6.1 67 Sandstone RS 8150 1.9 3.8 50 -M 7.4 * Whiskey Park 8950 5.0 8.0 62 7.9 10.3 77 ----- ----- Basin Index (%) 61 69 UPPER GREEN RIVER Big Sandy Opening 9080 4.8 4.7 102 5.2 5.3 98 Blind Bull Sum 8650 11.6 7.8 149 7.7 7.9 97 East Rim Divide 7930 3.4 3.5 97 4.3 4.6 93 Elkhart Park G.S. 9400 4.2 4.5 93 4.5 5.4 83 Gros Ventre Summit 8750 7.2 4.8 150 6.6 5.3 125 Gunsight Pass 9820 6.6 4.4 150 7.2 5.4 133 Kendall R.S. 7740 4.4 3.9 113 5.4 5.4 100 Loomis Park 8240 5.4 5.1 106 6.1 6.7 91 New Fork Lake 8340 3.7 3.5 106 3.3 4.4 75 Pocket Creek 9360 4.8 -M * 3.8 -M * Snider Basin 8060 2.9 4.2 69 5.3 5.5 96 Spring Creek Divide 9000 7.8 8.1 96 8.4 9.2 91 Triple Peak 8500 8.4 7.1 118 10.5 9.3 113 ----- ----- Basin Index (%) 114 100 LOWER GREEN RIVER Blacks Fork Jct 8869 2.5 -M * 3.4 -M * Buck Pasture 9632 3.8 -M * 4.6 -M * EF Blacks Fork GS 9360 2.5 -M * 3.8 -M * Hams Fork 7840 1.8 3.5 51 3.3 4.4 75 Hewinta 9500 1.9 3.1 61 4.3 5.8 74 Hickerson Park 9122 2.6 2.1 124 2.1 4.5 47 Hole-in-Rock 9168 1.9 2.4 79 2.5 4.2 60 Indian Creek 9425 6.7 8.5 79 5.5 8.3 66 Kelley R.S. 8180 3.6 4.8 75 4.7 7.0 67 Spirit Lk 10235 2.8 -M * 3.2 -M * Steel Creek Park 10158 4.7 5.5 85 4.9 6.6 74 ----- ----- Basin Index (%) 78 67 UPPER BEAR RIVER Bear River RS 8777 2.3 -M * 3.8 -M * Bug Lake 7987 4.3 5.4 80 6.4 7.7 83 Burts Miller Ranch 8000 1.4 -M * 2.5 -M * Chalk Creek #1 9171 4.9 8.8 56 5.7 10.1 56 Hayden Fork 9130 3.5 4.5 78 5.0 8.2 61 Kelley R.S. 8180 3.6 4.8 75 4.7 7.0 67 Lily Lake 9133 2.8 4.5 62 4.0 7.1 56 Monte Cristo 8932 6.6 8.5 78 6.8 10.0 68 Salt River Summit 7640 2.5 3.7 68 4.4 6.2 71 ----- ----- Basin Index (%) 70 66 ----------------------------------------------------------------------------- -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.