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 22 , 2018 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 5.3 6.0 88 7.3 8.7 84 Black Bear 8170 9.9 14.7 67 12.3 15.6 79 Blind Bull Sum 8650 6.8 7.9 86 6.3 8.1 78 Cottonwood Creek 7670 6.9 7.2 96 9.4 9.7 97 East Rim Divide 7930 2.9 3.6 81 4.1 4.8 85 Grand Targhee 9260 16.7 14.8 113 14.1 13.0 108 Granite Creek 6770 4.6 4.9 94 7.1 8.0 89 Grassy Lake 7265 9.0 10.4 87 12.7 14.4 88 Gros Ventre Summit 8750 3.1 5.0 62 3.7 5.4 69 Gunsight Pass 9820 4.0 4.5 89 6.3 5.5 115 Lewis Lake Divide 7850 7.8 10.7 73 11.7 14.5 81 Phillips Bench 8200 6.1 8.9 69 9.6 10.9 88 Salt River Summit 7640 3.4 3.9 87 5.7 6.5 88 Snake River Station 6920 5.2 5.3 98 9.8 9.5 103 Spring Creek Divide 9000 7.5 8.2 91 9.2 9.4 98 Thumb Divide 7980 3.2 5.2 62 5.6 7.6 74 Togwotee Pass 9580 8.9 9.7 92 9.8 10.1 97 Two Ocean Plateau 9240 10.3 10.9 94 8.9 11.2 79 Willow Creek 8080 8.2 9.2 89 12.7 13.6 93 Younts Peak 8350 -M 5.9 * -M 6.7 * ----- ----- Basin Index (%) 86 89 MADISON-GALLATIN Black Bear 8170 9.9 14.7 67 12.3 15.6 79 Canyon 7870 3.8 4.5 84 5.4 6.8 79 Madison Plateau 7750 5.4 8.9 61 7.3 10.6 69 West Yellowstone 6700 3.0 3.8 79 4.6 6.0 77 Whiskey Creek 6800 3.0 5.6 54 3.8 8.5 45 ----- ----- Basin Index (%) 67 70 YELLOWSTONE Beartooth Lake 9360 6.7 8.7 77 5.7 8.0 71 Burnt Mtn 5880 2.3 1.8 128 5.9 6.2 95 Canyon 7870 3.8 4.5 84 5.4 6.8 79 Cole Creek 7850 6.5 5.7 114 6.6 6.0 110 Evening Star 9200 10.4 9.6 108 13.1 11.6 113 Fisher Creek 9100 9.2 13.1 70 12.7 13.1 97 Northeast Entrance 7350 3.9 2.9 134 6.4 5.5 116 Parker Peak 9400 9.6 8.5 113 10.6 7.6 139 Sylvan Lake 8420 8.6 8.0 108 13.2 9.9 133 Thumb Divide 7980 3.2 5.2 62 5.6 7.6 74 Two Ocean Plateau 9240 10.3 10.9 94 8.9 11.2 79 White Mill 8700 7.0 8.7 80 6.1 9.9 62 Wolverine 7650 3.9 3.9 100 5.6 5.6 100 ----- ----- Basin Index (%) 93 97 WIND RIVER Burroughs Creek 8750 2.8 -M * 4.3 -M * Castle Creek 8400 1.2 -M * 2.4 -M * Cold Springs 9630 2.5 2.9 86 2.7 4.5 60 Deer Park 9700 4.7 5.2 90 5.1 7.6 67 Hobbs Park 10100 4.3 6.0 72 3.7 5.6 66 Kirwin 9550 3.0 4.1 73 3.2 5.0 64 Little Warm 9370 2.7 3.9 69 3.6 5.5 65 Owl Creek 8975 2.5 2.3 109 3.1 2.6 119 South Pass 9040 3.7 5.6 66 4.2 7.4 57 St. Lawrence Alt 8620 1.5 2.6 58 3.5 4.0 88 Togwotee Pass 9580 8.9 9.7 92 9.8 10.1 97 Townsend Creek 8700 3.1 3.4 91 4.3 5.3 81 ----- ----- Basin Index (%) 81 75 BIGHORN BASIN Bald Mtn. 9380 8.1 7.3 111 5.2 7.0 74 Bear Trap Meadow 8200 3.6 2.3 157 3.7 3.9 95 Bone Springs Div 9350 6.3 6.6 95 5.4 6.4 84 Grave Springs 8550 3.1 2.8 111 4.0 4.6 87 Kirwin 9550 3.0 4.1 73 3.2 5.0 64 Marquette 8760 3.1 -M * 4.3 -M * Middle Powder 7760 3.8 4.3 88 3.3 5.6 59 Owl Creek 8975 2.5 2.3 109 3.1 2.6 119 Powder River Pass 9480 4.3 4.0 108 4.0 5.3 75 Shell Creek 9580 -M 6.5 * -M 5.9 * Timber Creek 7950 1.4 1.9 74 3.1 3.7 84 ----- ----- Basin Index (%) 101 79 SHOSHONE RIVER Blackwater 9780 9.7 9.3 104 10.2 9.0 113 Evening Star 9200 10.4 9.6 108 13.1 11.6 113 Marquette 8760 3.1 -M * 4.3 -M * Sylvan Road 7120 5.1 4.5 113 7.7 8.1 95 Younts Peak 8350 -M 5.9 * -M 6.7 * ----- ----- Basin Index (%) 108 108 POWDER RIVER Bear Trap Meadow 8200 3.6 2.3 157 3.7 3.9 95 Cloud Peak Reservoir 9860 5.6 5.3 106 5.4 5.8 93 Grave Springs 8550 3.1 2.8 111 4.0 4.6 87 Hansen Sawmill 8360 2.1 2.6 81 3.8 3.7 103 Middle Powder 7760 3.8 4.3 88 3.3 5.6 59 Powder River Pass 9480 4.3 4.0 108 4.0 5.3 75 Soldier Park 8720 1.7 -M * 3.7 -M * ----- ----- Basin Index (%) 106 84 TONGUE RIVER Big Goose 7990 2.8 3.2 88 4.9 4.9 100 Bone Springs Div 9350 6.3 6.6 95 5.4 6.4 84 Burgess Junction 7880 3.3 4.1 80 4.1 5.4 76 Dome Lake 8880 2.5 4.7 53 3.8 6.2 61 Little Goose 8870 4.1 -M * 3.9 -M * Sucker Creek 8880 5.0 4.4 114 4.7 6.1 77 Tie Creek 6870 1.5 1.4 107 5.3 5.1 104 ----- ----- Basin Index (%) 88 83 BELLE FOURCHE Cole Canyon 5910 1.9 1.1 173 4.6 4.2 110 ----- ----- Basin Index (%) 173 110 CHEYENNE RIVER BASIN Blind Park 6890 2.6 2.4 108 3.0 5.3 57 North Rapid Creek 6130 1.8 2.5 72 2.7 4.5 60 ----- ----- Basin Index (%) 90 58 UPPER N. PLATTE Arapaho Ridge 10960 9.6 8.3 116 10.9 9.7 112 Blackhall Mtn 9820 10.3 -M * 13.5 -M * Columbine 9160 8.8 7.7 114 11.7 10.2 115 Divide Peak 8880 5.9 7.1 83 8.8 9.2 96 Joe Wright 10120 8.2 8.6 95 14.0 10.9 128 Laprele Creek 8375 4.7 3.3 142 6.0 5.3 113 Med Bow 10500 15.7 -M * 16.4 -M * North French Creek 10130 12.5 10.3 121 14.4 10.7 135 Never Summer 10280 8.4 7.5 112 9.0 -M * Old Battle 10000 12.1 11.2 108 14.3 14.4 99 Rawah 9020 3.6 3.8 95 6.6 6.7 99 Sage Creek Basin 7850 4.3 4.7 91 6.7 6.3 106 Sand Lake 10050 10.8 10.0 108 9.7 10.0 97 South Brush Creek 8440 4.3 4.2 102 5.6 6.5 86 Tower 10500 17.5 17.7 99 16.3 16.4 99 Webber Springs 9250 7.6 8.4 90 11.4 11.0 104 Willow Creek Pass 9540 5.8 4.9 118 7.8 5.8 134 Zirkel 9340 9.9 8.1 122 14.4 12.0 120 ----- ----- Basin Index (%) 107 109 SWEETWATER Deer Park 9700 4.7 5.2 90 5.1 7.6 67 Larsen Creek 9000 2.6 4.1 63 5.6 -M * South Pass 9040 3.7 5.6 66 4.2 7.4 57 ----- ----- Basin Index (%) 74 62 LOWER N. PLATTE Casper Mtn. 7900 4.5 5.2 87 4.8 6.7 72 Laprele Creek 8375 4.7 3.3 142 6.0 5.3 113 Reno Hill 8400 5.5 5.2 106 6.7 6.4 105 Windy Peak 7900 4.2 2.8 150 4.7 4.7 100 ----- ----- Basin Index (%) 115 96 LARAMIE RIVER Brooklyn Lake 10240 9.1 7.1 128 11.0 8.2 134 Cinnabar Park 9574 9.0 7.6 118 11.5 10.0 115 Crow Creek 8330 1.3 3.9 33 4.4 4.9 90 Deadman Hill 10220 7.1 6.4 111 7.3 7.0 104 Rawah 9020 3.6 3.8 95 6.6 6.7 99 Roach 9700 5.6 5.9 95 7.6 7.9 96 ----- ----- Basin Index (%) 103 108 S. PLATTE Black Mountain 8920 3.2 -M * 4.3 -M * Crow Creek 8330 1.3 3.9 33 4.4 4.9 90 Deadman Hill 10220 7.1 6.4 111 7.3 7.0 104 ----- ----- Basin Index (%) 82 98 LITTLE SNAKE RIVER Battle Mountain 7440 4.4 3.2 138 6.7 6.3 106 Divide Peak 8880 5.9 7.1 83 8.8 9.2 96 Elk River 8700 5.4 5.6 96 6.3 8.0 79 Little Snake River 8915 8.8 7.0 126 16.2 12.9 126 Old Battle 10000 12.1 11.2 108 14.3 14.4 99 Sage Creek Basin 7850 4.3 4.7 91 6.7 6.3 106 Sandstone RS 8150 5.4 3.9 138 7.2 7.6 95 Whiskey Park 8950 9.1 8.2 111 13.1 10.6 124 ----- ----- Basin Index (%) 109 105 UPPER GREEN RIVER Big Sandy Opening 9080 4.1 4.8 85 5.2 5.5 95 Blind Bull Sum 8650 6.8 7.9 86 6.3 8.1 78 East Rim Divide 7930 2.9 3.6 81 4.1 4.8 85 Elkhart Park G.S. 9400 4.1 4.6 89 5.3 5.6 95 Gros Ventre Summit 8750 3.1 5.0 62 3.7 5.4 69 Gunsight Pass 9820 4.0 4.5 89 6.3 5.5 115 Kendall R.S. 7740 3.3 4.1 80 4.4 5.6 79 Loomis Park 8240 4.8 5.2 92 6.3 6.9 91 New Fork Lake 8340 3.0 3.7 81 3.6 4.5 80 Pocket Creek 9360 5.9 -M * 6.6 -M * Snyder Basin 8060 4.1 4.4 93 6.0 5.7 105 Spring Creek Divide 9000 7.5 8.2 91 9.2 9.4 98 Triple Peak 8500 7.9 7.3 108 10.0 9.6 104 ----- ----- Basin Index (%) 88 92 LOWER GREEN RIVER Blacks Fork Jct 8869 2.9 -M * 5.3 -M * Buck Pasture 9632 5.2 -M * 8.4 -M * EF Blacks Fork GS 9360 3.8 -M * 4.9 -M * Hams Fork 7840 3.5 3.7 95 5.0 4.5 111 Hewinta 9500 2.9 3.2 91 6.2 5.9 105 Hickerson Park 9122 2.5 2.2 114 5.1 4.5 113 Hole-in-Rock 9168 1.9 2.5 76 4.9 4.2 117 Indian Creek 9425 6.3 8.9 71 5.8 8.6 67 Kelley R.S. 8180 4.7 5.1 92 5.8 7.3 79 Spirit Lk 10235 4.8 -M * 6.6 -M * Steel Creek Park 10158 5.4 5.7 95 7.4 6.8 109 ----- ----- Basin Index (%) 87 96 UPPER BEAR RIVER Bear River RS 8777 2.8 -M * 6.0 -M * Bug Lake 7987 4.0 5.5 73 8.8 7.9 111 Burts Miller Ranch 8000 1.3 -M * 3.4 -M * Chalk Creek #1 9171 5.8 9.1 64 10.9 10.3 106 Hayden Fork 9130 4.3 4.6 93 8.9 8.4 106 Kelley R.S. 8180 4.7 5.1 92 5.8 7.3 79 Lily Lake 9133 4.3 4.6 93 6.8 7.3 93 Monte Cristo 8932 7.5 8.8 85 9.7 10.3 94 Salt River Summit 7640 3.4 3.9 87 5.7 6.5 88 ----- ----- Basin Index (%) 82 98 ----------------------------------------------------------------------------- -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.