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 SATURDAY: DECEMBER 9 , 2017 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7030 6.5 4.7 138 8.3 7.3 114 Black Bear 8170 13.5 11.3 119 12.9 12.6 102 Blind Bull Sum 8650 11.2 6.2 181 7.3 6.8 107 Cottonwood Creek 7670 5.3 5.5 96 7.0 8.0 88 East Rim Divide 7930 3.2 2.4 133 4.0 4.0 100 Grand Targhee 9260 20.7 10.4 199 12.5 10.6 118 Granite Creek 6770 4.8 3.5 137 8.0 6.5 123 Grassy Lake 7265 7.8 7.9 99 11.2 11.8 95 Gros Ventre Summit 8750 6.8 4.5 151 6.3 4.7 134 Gunsight Pass 9820 6.0 3.8 158 6.6 4.7 140 Lewis Lake Divide 7850 10.1 8.8 115 13.2 11.9 111 Phillips Bench 8200 7.4 7.1 104 9.4 9.0 104 Salt River Summit 7760 2.0 2.7 74 4.0 5.2 77 Snake River Station 6920 4.8 3.9 123 8.5 7.9 108 Spring Creek Divide 9000 7.5 6.2 121 8.1 7.7 105 Thumb Divide 7980 6.5 3.8 171 8.1 6.4 127 Togwotee Pass 9580 13.2 8.2 161 12.8 8.5 151 Two Ocean Plateau 9240 17.0 9.8 173 11.5 9.5 121 Willow Creek 8380 9.0 7.0 129 12.4 11.2 111 Younts Peak 8350 -M 4.9 * -M 5.8 * ----- ----- Basin Index (%) 139 112 MADISON-GALLATIN Black Bear 8170 13.5 11.3 119 12.9 12.6 102 Canyon 7870 4.6 3.3 139 6.0 5.6 107 Madison Plateau 7750 7.6 6.6 115 8.9 8.7 102 West Yellowstone 6700 2.9 2.6 112 5.9 4.9 120 Whiskey Creek 6800 3.6 4.0 90 5.7 7.0 81 ----- ----- Basin Index (%) 116 102 YELLOWSTONE Beartooth Lake 9360 13.0 7.1 183 11.3 6.5 174 Burnt Mtn 5880 1.0 1.4 71 6.2 5.7 109 Canyon 7870 4.6 3.3 139 6.0 5.6 107 Cole Creek 7850 5.9 5.0 118 4.4 5.4 81 Evening Star 9200 14.7 8.2 179 15.1 9.8 154 Fisher Creek 9100 17.8 9.9 180 15.3 10.8 142 Northeast Entrance 7350 2.7 2.2 123 6.0 4.7 128 Parker Peak 9400 12.7 6.9 184 10.6 6.5 163 Sylvan Lake 8420 9.6 6.2 155 10.0 8.4 119 Thumb Divide 7980 6.5 3.8 171 8.1 6.4 127 Two Ocean Plateau 9240 17.0 9.8 173 11.5 9.5 121 White Mill 8700 13.8 6.9 200 9.6 8.3 116 Wolverine 7650 3.2 2.8 114 7.1 4.7 151 ----- ----- Basin Index (%) 167 131 WIND RIVER Burroughs Creek 8750 5.4 -M * 6.5 -M * Castle Creek 8400 2.6 -M * 4.1 -M * Cold Springs 9630 3.5 2.5 140 4.2 4.0 105 Deer Park 9700 5.8 4.6 126 6.6 6.6 100 Hobbs Park 10100 8.6 5.2 165 7.3 5.0 146 Kirwin 9550 8.5 3.7 230 7.1 4.5 158 Little Warm 9370 7.5 3.4 221 7.3 4.8 152 Owl Creek 8975 1.7 1.9 89 3.3 2.4 138 South Pass 9040 4.9 4.6 107 4.0 6.3 63 St. Lawrence Alt 8620 2.4 2.3 104 4.6 3.6 128 Togwotee Pass 9580 13.2 8.2 161 12.8 8.5 151 Townsend Creek 8700 3.2 2.9 110 4.5 4.8 94 ----- ----- Basin Index (%) 151 122 BIGHORN BASIN Bald Mtn. 9380 7.4 6.3 117 4.7 5.8 81 Bear Trap Meadow 8200 3.2 1.8 178 4.3 3.5 123 Bone Springs Div 9350 5.7 5.6 102 4.5 5.4 83 Grave Springs 8550 2.2 2.2 100 2.3 4.0 58 Kirwin 9550 8.5 3.7 230 7.1 4.5 158 Marquette 8760 3.0 -M * 5.4 -M * Middle Powder 7760 3.5 3.3 106 2.8 4.8 58 Owl Creek 8975 1.7 1.9 89 3.3 2.4 138 Powder River Pass 9480 6.2 3.4 182 5.3 4.6 115 Shell Creek 9580 8.0 5.2 154 5.1 5.1 100 Timber Creek 7950 1.3 1.9 68 1.2 3.4 35 ----- ----- Basin Index (%) 135 93 SHOSHONE RIVER Blackwater 9780 14.8 7.6 195 12.2 7.5 163 Evening Star 9200 14.7 8.2 179 15.1 9.8 154 Marquette 8760 3.0 -M * 5.4 -M * Sylvan Road 7120 4.1 3.5 117 8.0 6.8 118 Younts Peak 8350 -M 4.9 * -M 5.8 * ----- ----- Basin Index (%) 174 146 POWDER RIVER Bear Trap Meadow 8200 3.2 1.8 178 4.3 3.5 123 Cloud Peak Reservoir 9860 4.9 4.3 114 5.7 5.1 112 Grave Springs 8550 2.2 2.2 100 2.3 4.0 58 Hansen Sawmill 8360 2.5 1.9 132 3.7 3.3 112 Middle Powder 7760 3.5 3.3 106 2.8 4.8 58 Powder River Pass 9480 6.2 3.4 182 5.3 4.6 115 Soldier Park 8720 1.5 -M * 3.8 -M * ----- ----- Basin Index (%) 133 95 TONGUE RIVER Big Goose 7990 2.2 2.8 79 3.0 4.3 70 Bone Springs Div 9350 5.7 5.6 102 4.5 5.4 83 Burgess Junction 7880 2.6 3.4 76 2.7 4.6 59 Dome Lake 8880 3.4 4.1 83 3.8 5.4 70 Little Goose 8870 2.6 -M * 4.5 -M * Sucker Creek 8880 3.2 3.7 86 -M 5.2 * Tie Creek 6870 .7 1.0 70 3.4 4.5 76 ----- ----- Basin Index (%) 86 72 BELLE FOURCHE Cole Canyon 5910 1.4 1.1 127 3.3 3.9 85 ----- ----- Basin Index (%) 127 85 CHEYENNE RIVER BASIN Blind Park 6890 2.4 1.9 126 4.2 4.8 88 North Rapid Creek 6130 2.6 1.9 137 3.0 4.0 75 ----- ----- Basin Index (%) 132 82 UPPER N. PLATTE Arapaho Ridge 10960 5.8 6.5 89 6.2 8.3 75 Blackhall Mtn 9820 7.8 -M * 8.4 -M * Columbine 9160 3.0 5.4 56 7.2 8.2 88 Divide Peak 8880 3.7 5.4 69 7.0 7.6 92 Joe Wright 10120 4.8 6.7 72 10.5 9.1 115 Laprele Creek 8375 1.8 2.5 72 3.3 4.5 73 Med Bow 10500 11.5 -M * -M -M * North French Creek 10130 8.2 8.1 101 9.0 8.7 103 Never Summer 10280 6.1 5.8 105 6.1 -M * Old Battle 10000 7.3 8.9 82 6.9 11.6 59 Rawah 9020 3.5 3.0 117 6.5 5.6 116 Sage Creek Basin 7850 2.1 3.1 68 3.9 5.2 75 Sand Lake 10050 8.9 8.2 109 7.9 8.3 95 South Brush Creek 8440 3.4 3.1 110 4.9 5.4 91 Tower 10500 9.0 13.2 68 10.7 13.3 80 Webber Springs 9250 4.7 6.1 77 6.9 8.9 78 Willow Creek Pass 9540 5.2 3.9 133 5.3 5.0 106 Zirkel 9340 4.8 5.6 86 9.5 9.9 96 ----- ----- Basin Index (%) 86 88 SWEETWATER Deer Park 9700 5.8 4.6 126 6.6 6.6 100 Larsen Creek 9000 2.1 3.1 68 4.2 -M * South Pass 9040 4.9 4.6 107 4.0 6.3 63 ----- ----- Basin Index (%) 104 82 LOWER N. PLATTE Casper Mtn. 7900 2.9 3.9 74 2.9 5.9 49 Laprele Creek 8375 1.8 2.5 72 3.3 4.5 73 Reno Hill 8400 3.9 4.3 91 4.9 5.5 89 Windy Peak 7900 1.3 2.1 62 3.0 4.0 75 ----- ----- Basin Index (%) 77 71 LARAMIE RIVER Brooklyn Lake 10240 5.4 5.1 106 7.1 6.7 106 Cinnabar Park 9574 6.6 6.2 106 8.7 8.1 107 Crow Creek 8330 .1 3.2 3 4.4 4.1 107 Deadman Hill 10220 7.5 5.1 147 7.9 5.9 134 Rawah 9020 3.5 3.0 117 6.5 5.6 116 Roach 9700 4.8 4.6 104 7.0 6.5 108 ----- ----- Basin Index (%) 103 113 S. PLATTE Black Mountain 8920 3.6 -M * 5.8 -M * Crow Creek 8330 .1 3.2 3 4.4 4.1 107 Deadman Hill 10220 7.5 5.1 147 7.9 5.9 134 ----- ----- Basin Index (%) 92 123 LITTLE SNAKE RIVER Battle Mountain 7440 .8 2.2 36 2.4 5.2 46 Divide Peak 8880 3.7 5.4 69 7.0 7.6 92 Elk River 8700 3.5 3.9 90 6.0 6.5 92 Little Snake River 8915 4.0 4.5 89 8.5 10.6 80 Old Battle 10000 7.3 8.9 82 6.9 11.6 59 Sage Creek Basin 7850 2.1 3.1 68 3.9 5.2 75 Sandstone RS 8150 1.7 2.7 63 3.0 6.2 48 Whiskey Park 8950 4.8 6.3 76 7.7 8.6 90 ----- ----- Basin Index (%) 75 74 UPPER GREEN RIVER Big Sandy Opening 9080 4.1 4.0 102 4.6 4.7 98 Blind Bull Sum 8650 11.2 6.2 181 7.3 6.8 107 East Rim Divide 7930 3.2 2.4 133 4.0 4.0 100 Elkhart Park G.S. 9400 3.7 3.8 97 4.1 4.8 85 Gros Ventre Summit 8750 6.8 4.5 151 6.3 4.7 134 Gunsight Pass 9820 6.0 3.8 158 6.6 4.7 140 Kendall R.S. 7740 4.2 3.1 135 5.2 4.7 111 Loomis Park 8240 5.0 3.8 132 5.8 5.7 102 New Fork Lake 8340 3.3 2.7 122 3.0 3.8 79 Pocket Creek 9360 4.6 -M * 3.8 -M * Snider Basin 8060 2.1 3.1 68 4.8 4.6 104 Spring Creek Divide 9000 7.5 6.2 121 8.1 7.7 105 Triple Peak 8500 8.0 5.7 140 10.3 8.0 129 ----- ----- Basin Index (%) 132 109 LOWER GREEN RIVER Blacks Fork Jct 8869 1.9 -M * 3.1 -M * Buck Pasture 9632 3.2 -M * 4.3 -M * EF Blacks Fork GS 9360 2.2 -M * 3.1 -M * Hams Fork 7840 1.5 2.8 54 3.2 3.8 84 Hewinta 9500 1.0 2.2 45 3.5 5.1 69 Hickerson Park 9122 2.2 1.7 129 1.8 4.1 44 Hole-in-Rock 9168 1.5 1.9 79 2.2 3.9 56 Indian Creek 9425 6.6 6.7 99 5.4 7.0 77 Kelley R.S. 8180 3.3 3.7 89 4.4 5.9 75 Spirit Lk 10235 2.3 -M * 2.6 -M * Steel Creek Park 10158 4.4 4.8 92 4.4 5.8 76 ----- ----- Basin Index (%) 86 70 UPPER BEAR RIVER Bear River RS 8777 1.9 -M * 3.4 -M * Bug Lake 7987 4.0 4.2 95 5.9 6.6 89 Burts Miller Ranch 8000 .3 -M * 2.0 -M * Chalk Creek #1 9171 4.3 7.0 61 5.5 8.7 63 Hayden Fork 9130 3.0 3.5 86 4.6 7.1 65 Kelley R.S. 8180 3.3 3.7 89 4.4 5.9 75 Lily Lake 9133 2.2 3.5 63 3.6 6.2 58 Monte Cristo 8932 6.4 6.8 94 6.6 8.5 78 Salt River Summit 7760 2.0 2.7 74 4.0 5.2 77 ----- ----- Basin Index (%) 80 72 ----------------------------------------------------------------------------- -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.