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 TUESDAY: DECEMBER 26 , 2017 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 8.0 6.6 121 9.9 9.1 109 Black Bear 8170 17.0 15.8 108 16.3 16.2 101 Blind Bull Sum 8650 13.7 8.3 165 8.5 8.5 100 Cottonwood Creek 7670 7.7 7.7 100 9.2 10.2 90 East Rim Divide 7930 4.2 3.9 108 5.1 5.0 102 Grand Targhee 9260 23.5 16.3 144 13.9 14.1 99 Granite Creek 6770 6.4 5.5 116 9.5 8.5 112 Grassy Lake 7265 10.8 11.1 97 14.3 15.4 93 Gros Ventre Summit 8750 8.0 5.5 145 7.3 5.6 130 Gunsight Pass 9820 7.3 5.2 140 7.9 5.8 136 Lewis Lake Divide 7850 12.4 11.8 105 15.5 15.3 101 Phillips Bench 8200 9.3 9.7 96 10.9 11.6 94 Salt River Summit 7640 3.7 4.3 86 5.6 6.8 82 Snake River Station 6920 6.3 5.6 112 10.6 10.0 106 Spring Creek Divide 9000 10.0 8.7 115 10.3 9.9 104 Thumb Divide 7980 7.9 5.6 141 9.6 7.9 122 Togwotee Pass 9580 15.4 10.2 151 15.3 10.6 144 Two Ocean Plateau 9240 18.9 11.5 164 13.4 11.6 116 Willow Creek 8080 12.2 9.8 124 15.4 14.3 108 Younts Peak 8350 -M 6.4 * -M 7.0 * ----- ----- Basin Index (%) 124 106 MADISON-GALLATIN Black Bear 8170 17.0 15.8 108 16.3 16.2 101 Canyon 7870 6.1 4.8 127 7.8 7.2 108 Madison Plateau 7750 9.8 9.5 103 11.0 11.1 99 West Yellowstone 6700 4.7 4.1 115 7.5 6.4 117 Whiskey Creek 6800 5.4 5.8 93 7.1 8.9 80 ----- ----- Basin Index (%) 108 100 YELLOWSTONE Beartooth Lake 9360 15.6 9.1 171 13.6 8.4 162 Burnt Mtn 5880 2.4 1.9 126 7.7 6.4 120 Canyon 7870 6.1 4.8 127 7.8 7.2 108 Cole Creek 7850 7.2 6.0 120 5.1 6.2 82 Evening Star 9200 16.9 10.2 166 17.8 12.2 146 Fisher Creek 9100 21.6 13.7 158 18.2 13.7 133 Northeast Entrance 7350 3.8 3.3 115 7.2 5.7 126 Parker Peak 9400 15.5 9.0 172 13.1 7.9 166 Sylvan Lake 8420 11.5 8.5 135 12.0 10.4 115 Thumb Divide 7980 7.9 5.6 141 9.6 7.9 122 Two Ocean Plateau 9240 18.9 11.5 164 13.4 11.6 116 White Mill 8700 15.9 9.0 177 11.3 10.4 109 Wolverine 7650 5.7 4.3 133 8.9 5.8 153 ----- ----- Basin Index (%) 154 128 WIND RIVER Burroughs Creek 8750 6.5 -M * 7.8 -M * Castle Creek 8400 3.9 -M * 5.3 -M * Cold Springs 9630 4.7 3.0 157 5.2 4.7 111 Deer Park 9700 6.8 6.0 113 7.5 8.0 94 Hobbs Park 10100 10.1 6.1 166 8.3 5.8 143 Kirwin 9550 9.8 4.2 233 8.3 5.2 160 Little Warm 9370 8.9 4.1 217 8.7 5.8 150 Owl Creek 8975 2.4 2.4 100 4.0 2.7 148 South Pass 9040 6.0 6.0 100 4.7 7.7 61 St. Lawrence Alt 8620 3.1 2.8 111 5.5 4.1 134 Togwotee Pass 9580 15.4 10.2 151 15.3 10.6 144 Townsend Creek 8700 4.2 3.7 114 5.7 5.6 102 ----- ----- Basin Index (%) 147 122 BIGHORN BASIN Bald Mtn. 9380 8.9 7.6 117 5.7 7.4 77 Bear Trap Meadow 8200 3.4 2.5 136 4.9 4.1 120 Bone Springs Div 9350 6.9 6.9 100 5.3 6.8 78 Grave Springs 8550 2.8 3.0 93 2.7 4.7 57 Kirwin 9550 9.8 4.2 233 8.3 5.2 160 Marquette 8760 3.7 -M * 6.3 -M * Middle Powder 7760 4.1 4.7 87 2.8 5.8 48 Owl Creek 8975 2.4 2.4 100 4.0 2.7 148 Powder River Pass 9480 7.0 4.3 163 5.7 5.6 102 Shell Creek 9580 9.1 6.9 132 6.0 6.2 97 Timber Creek 7950 1.9 2.0 95 1.5 3.8 39 ----- ----- Basin Index (%) 127 90 SHOSHONE RIVER Blackwater 9780 16.7 9.8 170 14.3 9.3 154 Evening Star 9200 16.9 10.2 166 17.8 12.2 146 Marquette 8760 3.7 -M * 6.3 -M * Sylvan Road 7120 5.2 4.9 106 9.6 8.4 114 Younts Peak 8350 -M 6.4 * -M 7.0 * ----- ----- Basin Index (%) 156 139 POWDER RIVER Bear Trap Meadow 8200 3.4 2.5 136 4.9 4.1 120 Cloud Peak Reservoir 9860 5.8 5.7 102 6.0 6.0 100 Grave Springs 8550 2.8 3.0 93 2.7 4.7 57 Hansen Sawmill 8360 2.7 2.7 100 4.2 3.9 108 Middle Powder 7760 4.1 4.7 87 2.8 5.8 48 Powder River Pass 9480 7.0 4.3 163 5.7 5.6 102 Soldier Park 8720 1.5 -M * 4.0 -M * ----- ----- Basin Index (%) 113 87 TONGUE RIVER Big Goose 7990 2.5 3.5 71 3.4 5.1 67 Bone Springs Div 9350 6.9 6.9 100 5.3 6.8 78 Burgess Junction 7880 3.4 4.4 77 3.3 5.6 59 Dome Lake 8880 3.8 5.0 76 4.3 6.4 67 Little Goose 8870 3.3 -M * 5.0 -M * Sucker Creek 8880 3.9 4.8 81 -M 6.4 * Tie Creek 6870 1.3 1.7 76 -M 5.3 * ----- ----- Basin Index (%) 83 68 BELLE FOURCHE Cole Canyon 5910 1.7 1.6 106 3.8 4.5 84 ----- ----- Basin Index (%) 106 84 CHEYENNE RIVER BASIN Blind Park 6890 2.5 2.8 89 4.7 5.7 82 North Rapid Creek 6130 2.8 2.9 97 3.2 4.7 68 ----- ----- Basin Index (%) 93 76 UPPER N. PLATTE Arapaho Ridge 10960 8.5 8.8 97 8.6 10.1 85 Blackhall Mtn 9820 11.2 -M * 11.7 -M * Columbine 9160 5.2 8.1 64 10.2 10.8 94 Divide Peak 8880 5.8 7.6 76 9.0 9.7 93 Joe Wright 10120 7.1 9.0 79 13.2 11.5 115 Laprele Creek 8375 2.4 3.6 67 3.9 5.6 70 Med Bow 10500 16.4 -M * 14.4 -M * North French Creek 10130 11.5 10.7 107 12.1 11.2 108 Never Summer 10280 8.2 8.1 101 7.0 -M * Old Battle 10000 9.8 11.8 83 9.4 15.1 62 Rawah 9020 4.7 3.9 121 7.8 7.0 111 Sage Creek Basin 7850 3.8 5.1 75 5.4 6.7 81 Sand Lake 10050 12.0 10.6 113 10.1 10.6 95 South Brush Creek 8440 4.4 4.4 100 6.1 6.8 90 Tower 10500 -M 18.2 * -M 17.1 * Webber Springs 9250 6.9 8.9 78 9.0 11.5 78 Willow Creek Pass 9540 6.6 5.1 129 7.1 6.1 116 Zirkel 9340 7.9 8.8 90 12.8 12.5 102 ----- ----- Basin Index (%) 92 92 SWEETWATER Deer Park 9700 6.8 6.0 113 7.5 8.0 94 Larsen Creek 9000 3.1 4.4 70 5.6 -M * South Pass 9040 6.0 6.0 100 4.7 7.7 61 ----- ----- Basin Index (%) 97 78 LOWER N. PLATTE Casper Mtn. 7900 3.9 5.4 72 3.4 7.1 48 Laprele Creek 8375 2.4 3.6 67 3.9 5.6 70 Reno Hill 8400 4.5 5.4 83 5.6 6.7 84 Windy Peak 7900 1.9 3.0 63 3.5 4.9 71 ----- ----- Basin Index (%) 73 67 LARAMIE RIVER Brooklyn Lake 10240 9.5 7.4 128 10.6 8.6 123 Cinnabar Park 9574 10.3 7.9 130 12.6 10.5 120 Crow Creek 8330 .9 4.0 22 5.7 5.2 110 Deadman Hill 10220 9.7 6.8 143 9.7 7.3 133 Rawah 9020 4.7 3.9 121 7.8 7.0 111 Roach 9700 6.6 6.5 102 8.9 8.4 106 ----- ----- Basin Index (%) 114 118 S. PLATTE Black Mountain 8920 4.5 -M * 6.9 -M * Crow Creek 8330 .9 4.0 22 5.7 5.2 110 Deadman Hill 10220 9.7 6.8 143 9.7 7.3 133 ----- ----- Basin Index (%) 98 123 LITTLE SNAKE RIVER Battle Mountain 7440 1.5 3.5 43 4.5 6.6 68 Divide Peak 8880 5.8 7.6 76 9.0 9.7 93 Elk River 8700 5.2 6.0 87 7.1 8.5 84 Little Snake River 8915 6.7 7.9 85 11.6 13.7 85 Old Battle 10000 9.8 11.8 83 9.4 15.1 62 Sage Creek Basin 7850 3.8 5.1 75 5.4 6.7 81 Sandstone RS 8150 3.2 4.1 78 -M 8.0 * Whiskey Park 8950 7.3 8.7 84 10.3 11.1 93 ----- ----- Basin Index (%) 79 80 UPPER GREEN RIVER Big Sandy Opening 9080 5.9 5.2 113 6.2 5.8 107 Blind Bull Sum 8650 13.7 8.3 165 8.5 8.5 100 East Rim Divide 7930 4.2 3.9 108 5.1 5.0 102 Elkhart Park G.S. 9400 5.1 5.1 100 5.3 5.9 90 Gros Ventre Summit 8750 8.0 5.5 145 7.3 5.6 130 Gunsight Pass 9820 7.3 5.2 140 7.9 5.8 136 Kendall R.S. 7740 5.8 4.3 135 6.8 5.9 115 Loomis Park 8240 6.6 5.7 116 7.3 7.3 100 New Fork Lake 8340 5.0 4.1 122 4.4 4.7 94 Pocket Creek 9360 5.7 -M * 4.5 -M * Snider Basin 8060 4.5 4.7 96 6.6 6.0 110 Spring Creek Divide 9000 10.0 8.7 115 10.3 9.9 104 Triple Peak 8500 10.6 7.6 139 12.7 10.0 127 ----- ----- Basin Index (%) 127 110 LOWER GREEN RIVER Blacks Fork Jct 8869 3.5 -M * 4.5 -M * Buck Pasture 9632 5.5 -M * 6.1 -M * EF Blacks Fork GS 9360 3.3 -M * 3.9 -M * Hams Fork 7840 3.3 4.1 80 4.3 4.8 90 Hewinta 9500 3.0 3.4 88 5.3 6.1 87 Hickerson Park 9122 3.1 2.5 124 2.6 4.7 55 Hole-in-Rock 9168 2.5 2.8 89 3.1 4.4 70 Indian Creek 9425 8.5 9.6 89 6.5 9.0 72 Kelley R.S. 8180 5.0 5.7 88 6.2 7.7 81 Spirit Lk 10235 3.4 -M * 3.8 -M * Steel Creek Park 10158 6.3 5.9 107 6.4 7.1 90 ----- ----- Basin Index (%) 93 79 UPPER BEAR RIVER Bear River RS 8777 3.4 -M * 4.9 -M * Bug Lake 7987 5.2 5.8 90 7.8 8.3 94 Burts Miller Ranch 8000 2.1 -M * 3.1 -M * Chalk Creek #1 9171 6.3 9.4 67 7.2 10.8 67 Hayden Fork 9130 5.5 5.0 110 7.1 8.9 80 Kelley R.S. 8180 5.0 5.7 88 6.2 7.7 81 Lily Lake 9133 4.9 4.8 102 5.4 7.6 71 Monte Cristo 8932 9.1 9.3 98 8.9 10.8 82 Salt River Summit 7640 3.7 4.3 86 5.6 6.8 82 ----- ----- Basin Index (%) 90 79 ----------------------------------------------------------------------------- -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.