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 SUNDAY: DECEMBER 31 , 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 7.1 114 9.8 9.9 99 Black Bear 8170 17.6 17.5 101 16.9 17.7 95 Blind Bull Sum 8650 14.2 9.0 158 8.7 9.3 94 Cottonwood Creek 7670 8.1 8.3 98 9.9 11.0 90 East Rim Divide 7930 4.5 4.3 105 5.2 5.4 96 Grand Targhee 9260 23.7 17.5 135 14.3 14.7 97 Granite Creek 6770 6.6 6.4 103 9.7 9.3 104 Grassy Lake 7265 10.9 12.5 87 14.3 16.8 85 Gros Ventre Summit 8750 8.2 6.1 134 7.5 6.1 123 Gunsight Pass 9820 7.8 6.0 130 8.2 6.4 128 Lewis Lake Divide 7850 13.0 13.1 99 16.4 16.6 99 Phillips Bench 8200 9.8 10.8 91 11.3 12.7 89 Salt River Summit 7640 3.5 4.8 73 5.5 7.4 74 Snake River Station 6920 6.5 6.2 105 10.6 10.9 97 Spring Creek Divide 9000 10.3 10.0 103 10.6 10.7 99 Thumb Divide 7980 8.4 6.1 138 9.8 8.7 113 Togwotee Pass 9580 16.5 11.0 150 16.5 11.4 145 Two Ocean Plateau 9240 20.0 12.4 161 14.3 12.5 114 Willow Creek 8080 12.5 10.6 118 15.6 15.4 101 Younts Peak 8350 -M 7.0 * -M 7.6 * ----- ----- Basin Index (%) 117 101 MADISON-GALLATIN Black Bear 8170 17.6 17.5 101 16.9 17.7 95 Canyon 7870 7.0 5.3 132 8.7 7.8 112 Madison Plateau 7750 10.2 10.2 100 11.4 12.2 93 West Yellowstone 6700 5.0 4.6 109 7.8 7.0 111 Whiskey Creek 6800 5.7 6.5 88 7.3 9.6 76 ----- ----- Basin Index (%) 103 96 YELLOWSTONE Beartooth Lake 9360 19.6 9.9 198 17.9 9.1 197 Burnt Mtn 5880 2.7 1.8 150 8.0 6.7 119 Canyon 7870 7.0 5.3 132 8.7 7.8 112 Cole Creek 7850 7.9 6.3 125 5.6 6.3 89 Evening Star 9200 20.2 11.2 180 21.3 13.1 163 Fisher Creek 9100 26.0 14.5 179 22.0 14.8 149 Northeast Entrance 7350 5.0 4.0 125 8.4 6.1 138 Parker Peak 9400 17.3 9.7 178 -M 8.4 * Sylvan Lake 8420 12.4 9.1 136 13.0 11.1 117 Thumb Divide 7980 8.4 6.1 138 9.8 8.7 113 Two Ocean Plateau 9240 20.0 12.4 161 14.3 12.5 114 White Mill 8700 19.8 9.8 202 14.5 11.2 129 Wolverine 7650 8.3 4.7 177 10.8 6.2 174 ----- ----- Basin Index (%) 167 136 WIND RIVER Burroughs Creek 8750 7.6 -M * 8.9 -M * Castle Creek 8400 4.5 -M * 5.8 -M * Cold Springs 9630 5.3 3.1 171 5.6 4.9 114 Deer Park 9700 6.1 6.6 92 7.6 8.7 87 Hobbs Park 10100 10.0 6.5 154 8.2 6.1 134 Kirwin 9550 11.2 4.3 260 9.8 5.6 175 Little Warm 9370 9.4 4.4 214 9.2 6.1 151 Owl Creek 8975 2.4 2.5 96 4.1 2.9 141 South Pass 9040 5.9 6.6 89 4.7 8.2 57 St. Lawrence Alt 8620 -M 3.0 * 5.4 4.3 126 Togwotee Pass 9580 16.5 11.0 150 16.5 11.4 145 Townsend Creek 8700 4.1 4.1 100 5.4 5.8 93 ----- ----- Basin Index (%) 144 120 BIGHORN BASIN Bald Mtn. 9380 10.0 8.3 120 6.5 7.8 83 Bear Trap Meadow 8200 3.7 2.5 148 5.0 4.2 119 Bone Springs Div 9350 8.3 7.2 115 6.2 7.1 87 Grave Springs 8550 2.9 3.3 88 2.8 5.1 55 Kirwin 9550 11.2 4.3 260 9.8 5.6 175 Marquette 8760 3.5 -M * 6.6 -M * Middle Powder 7760 4.2 4.9 86 3.1 6.0 52 Owl Creek 8975 2.4 2.5 96 4.1 2.9 141 Powder River Pass 9480 7.5 4.7 160 6.2 5.9 105 Shell Creek 9580 10.4 7.2 144 7.1 6.5 109 Timber Creek 7950 2.1 2.1 100 2.0 3.9 51 ----- ----- Basin Index (%) 133 96 SHOSHONE RIVER Blackwater 9780 19.2 10.4 185 16.6 9.8 169 Evening Star 9200 20.2 11.2 180 21.3 13.1 163 Marquette 8760 3.5 -M * 6.6 -M * Sylvan Road 7120 6.4 5.3 121 10.8 8.9 121 Younts Peak 8350 -M 7.0 * -M 7.6 * ----- ----- Basin Index (%) 170 153 POWDER RIVER Bear Trap Meadow 8200 3.7 2.5 148 5.0 4.2 119 Cloud Peak Reservoir 9860 7.1 6.2 115 6.8 6.2 110 Grave Springs 8550 2.9 3.3 88 2.8 5.1 55 Hansen Sawmill 8360 3.3 3.0 110 4.6 4.0 115 Middle Powder 7760 4.2 4.9 86 3.1 6.0 52 Powder River Pass 9480 7.5 4.7 160 6.2 5.9 105 Soldier Park 8720 2.3 -M * 4.8 -M * ----- ----- Basin Index (%) 117 91 TONGUE RIVER Big Goose 7990 3.1 3.6 86 3.7 5.3 70 Bone Springs Div 9350 8.3 7.2 115 6.2 7.1 87 Burgess Junction 7880 3.9 4.7 83 3.8 5.9 64 Dome Lake 8880 5.4 5.4 100 4.9 6.7 73 Little Goose 8870 3.8 -M * 5.7 -M * Sucker Creek 8880 4.4 5.1 86 -M 6.7 * Tie Creek 6870 1.4 2.0 70 4.0 5.5 73 ----- ----- Basin Index (%) 95 74 BELLE FOURCHE Cole Canyon 5910 2.1 2.2 95 4.1 4.6 89 ----- ----- Basin Index (%) 95 89 CHEYENNE RIVER BASIN Blind Park 6890 3.0 3.2 94 5.0 6.0 83 North Rapid Creek 6130 3.2 3.2 100 3.5 5.0 70 ----- ----- Basin Index (%) 97 77 UPPER N. PLATTE Arapaho Ridge 10960 8.6 9.3 92 8.7 10.8 81 Blackhall Mtn 9820 11.2 -M * 11.7 -M * Columbine 9160 5.0 8.7 57 10.5 11.4 92 Divide Peak 8880 5.7 8.4 68 9.1 10.3 88 Joe Wright 10120 6.8 9.4 72 13.3 12.0 111 Laprele Creek 8375 2.4 3.9 62 4.0 5.9 68 Med Bow 10500 17.0 -M * 14.9 -M * North French Creek 10130 11.9 11.5 103 12.6 12.0 105 Never Summer 10280 8.1 8.6 94 6.9 -M * Old Battle 10000 9.8 12.4 79 9.6 16.2 59 Rawah 9020 4.7 4.3 109 7.9 7.3 108 Sage Creek Basin 7850 3.8 5.7 67 5.4 7.4 73 Sand Lake 10050 12.2 11.6 105 10.3 11.1 93 South Brush Creek 8440 4.6 4.7 98 6.3 7.1 89 Tower 10500 12.3 18.5 66 13.9 18.2 76 Webber Springs 9250 6.9 9.4 73 9.1 12.4 73 Willow Creek Pass 9540 6.6 5.4 122 7.1 6.5 109 Zirkel 9340 7.8 9.8 80 12.9 13.5 96 ----- ----- Basin Index (%) 83 87 SWEETWATER Deer Park 9700 6.1 6.6 92 7.6 8.7 87 Larsen Creek 9000 2.7 4.8 56 5.6 -M * South Pass 9040 5.9 6.6 89 4.7 8.2 57 ----- ----- Basin Index (%) 82 73 LOWER N. PLATTE Casper Mtn. 7900 3.9 5.8 67 3.5 7.4 47 Laprele Creek 8375 2.4 3.9 62 4.0 5.9 68 Reno Hill 8400 4.7 5.7 82 5.7 7.0 81 Windy Peak 7900 2.1 3.1 68 3.8 5.1 75 ----- ----- Basin Index (%) 71 67 LARAMIE RIVER Brooklyn Lake 10240 10.0 7.8 128 11.1 9.2 121 Cinnabar Park 9574 10.5 8.9 118 12.8 11.4 112 Crow Creek 8330 1.0 4.4 23 5.9 5.4 109 Deadman Hill 10220 9.9 7.2 138 9.9 7.7 129 Rawah 9020 4.7 4.3 109 7.9 7.3 108 Roach 9700 6.7 6.9 97 9.1 8.9 102 ----- ----- Basin Index (%) 108 114 S. PLATTE Black Mountain 8920 4.5 -M * 6.9 -M * Crow Creek 8330 1.0 4.4 23 5.9 5.4 109 Deadman Hill 10220 9.9 7.2 138 9.9 7.7 129 ----- ----- Basin Index (%) 94 121 LITTLE SNAKE RIVER Battle Mountain 7440 1.5 4.0 38 4.5 6.9 65 Divide Peak 8880 5.7 8.4 68 9.1 10.3 88 Elk River 8700 5.3 6.6 80 7.3 9.0 81 Little Snake River 8915 6.7 8.9 75 11.6 14.6 79 Old Battle 10000 9.8 12.4 79 9.6 16.2 59 Sage Creek Basin 7850 3.8 5.7 67 5.4 7.4 73 Sandstone RS 8150 3.1 4.3 72 -M 8.4 * Whiskey Park 8950 7.2 9.4 77 10.3 11.9 87 ----- ----- Basin Index (%) 72 76 UPPER GREEN RIVER Big Sandy Opening 9080 6.0 5.8 103 6.3 6.2 102 Blind Bull Sum 8650 14.2 9.0 158 8.7 9.3 94 East Rim Divide 7930 4.5 4.3 105 5.2 5.4 96 Elkhart Park G.S. 9400 5.7 5.7 100 5.7 6.3 90 Gros Ventre Summit 8750 8.2 6.1 134 7.5 6.1 123 Gunsight Pass 9820 7.8 6.0 130 8.2 6.4 128 Kendall R.S. 7740 6.8 4.8 142 7.8 6.5 120 Loomis Park 8240 7.2 6.5 111 7.8 8.0 98 New Fork Lake 8340 5.6 4.5 124 4.7 5.1 92 Pocket Creek 9360 5.2 -M * 4.3 -M * Snider Basin 8060 4.7 5.1 92 6.7 6.5 103 Spring Creek Divide 9000 10.3 10.0 103 10.6 10.7 99 Triple Peak 8500 11.1 8.2 135 13.1 10.9 120 ----- ----- Basin Index (%) 121 106 LOWER GREEN RIVER Blacks Fork Jct 8869 3.4 -M * 4.5 -M * Buck Pasture 9632 5.4 -M * 6.1 -M * EF Blacks Fork GS 9360 3.2 -M * 3.8 -M * Hams Fork 7840 3.2 4.5 71 4.2 5.1 82 Hewinta 9500 3.0 3.7 81 5.2 6.4 81 Hickerson Park 9122 3.0 2.8 107 2.8 4.9 57 Hole-in-Rock 9168 2.5 2.9 86 3.2 4.6 70 Indian Creek 9425 8.5 10.0 85 6.4 9.8 65 Kelley R.S. 8180 4.9 6.1 80 6.1 8.3 73 Spirit Lk 10235 3.4 -M * 3.9 -M * Steel Creek Park 10158 6.4 6.2 103 6.4 7.4 86 ----- ----- Basin Index (%) 87 74 UPPER BEAR RIVER Bear River RS 8777 3.4 -M * 4.9 -M * Bug Lake 7987 5.2 6.2 84 7.8 8.9 88 Burts Miller Ranch 8000 2.4 -M * 3.0 -M * Chalk Creek #1 9171 6.3 9.6 66 7.1 11.4 62 Hayden Fork 9130 5.3 5.8 91 7.0 9.5 74 Kelley R.S. 8180 4.9 6.1 80 6.1 8.3 73 Lily Lake 9133 4.8 5.1 94 5.4 7.9 68 Monte Cristo 8932 9.0 10.0 90 9.0 11.6 78 Salt River Summit 7640 3.5 4.8 73 5.5 7.4 74 ----- ----- Basin Index (%) 82 74 ----------------------------------------------------------------------------- -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.