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: FEBRUARY 21 , 2018 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 14.7 13.0 113 16.2 16.4 99 Black Bear 8170 32.5 28.0 116 30.6 29.1 105 Blind Bull Sum 8650 25.4 17.1 149 15.0 15.2 99 Cottonwood Creek 7670 16.8 15.7 107 18.5 18.5 100 East Rim Divide 7930 9.1 7.5 121 9.1 9.0 101 Grand Targhee 9260 35.4 27.9 127 23.2 23.7 98 Granite Creek 6770 14.0 13.0 108 16.3 15.7 104 Grassy Lake 7265 24.3 24.8 98 27.3 28.1 97 Gros Ventre Summit 8750 10.6 9.3 114 10.6 9.5 112 Gunsight Pass 9820 12.0 10.0 120 12.0 10.2 118 Lewis Lake Divide 7850 29.5 24.4 121 -M 27.4 * Phillips Bench 8200 18.8 18.7 101 20.0 21.5 93 Salt River Summit 7640 7.6 10.0 76 9.0 12.8 70 Snake River Station 6920 14.7 13.6 108 19.1 17.8 107 Spring Creek Divide 9000 19.8 17.2 115 18.8 18.3 103 Thumb Divide 7980 14.4 11.2 129 14.7 13.9 106 Togwotee Pass 9580 24.1 16.9 143 24.6 18.4 134 Two Ocean Plateau 9240 30.5 20.4 150 -M 20.5 * Willow Creek 8080 24.7 20.7 119 26.9 25.2 107 Younts Peak 8350 -M 11.2 * -M 12.1 * ----- ----- Basin Index (%) 119 103 MADISON-GALLATIN Black Bear 8170 32.5 28.0 116 30.6 29.1 105 Canyon 7870 14.3 9.9 144 16.0 12.5 128 Madison Plateau 7750 20.5 16.7 123 20.5 20.0 102 West Yellowstone 6700 10.4 8.2 127 13.4 11.1 121 Whiskey Creek 6800 12.0 11.3 106 14.3 15.4 93 ----- ----- Basin Index (%) 121 108 YELLOWSTONE Beartooth Lake 9360 32.9 15.8 208 28.6 15.0 191 Burnt Mtn 5880 6.0 3.8 158 12.1 9.0 134 Canyon 7870 14.3 9.9 144 16.0 12.5 128 Cole Creek 7850 11.2 9.0 124 7.3 8.6 85 Evening Star 9200 33.7 18.4 183 30.8 21.0 147 Fisher Creek 9100 42.9 24.6 174 37.2 24.2 154 Northeast Entrance 7350 12.2 7.6 161 15.1 9.5 159 Parker Peak 9400 27.4 14.9 184 21.9 13.3 165 Sylvan Lake 8420 19.8 15.0 132 21.3 17.1 125 Thumb Divide 7980 14.4 11.2 129 14.7 13.9 106 Two Ocean Plateau 9240 30.5 20.4 150 -M 20.5 * White Mill 8700 34.5 17.2 201 25.3 18.1 140 Wolverine 7650 17.5 8.2 213 17.4 9.5 183 ----- ----- Basin Index (%) 169 144 WIND RIVER Burroughs Creek 8750 13.2 -M * 14.8 -M * Castle Creek 8400 7.2 -M * 8.3 -M * Cold Springs 9630 7.4 5.3 140 7.9 7.1 111 Deer Park 9700 8.0 10.2 78 10.3 14.3 72 Hobbs Park 10100 12.6 9.0 140 10.7 9.0 119 Kirwin 9550 15.9 6.4 248 14.3 8.3 172 Little Warm 9370 12.3 7.7 160 13.0 9.3 140 Owl Creek 8975 3.2 3.6 89 5.0 4.1 122 South Pass 9040 8.1 10.6 76 -M 12.8 * St. Lawrence Alt 8620 2.3 4.9 47 6.8 6.1 111 Togwotee Pass 9580 24.1 16.9 143 24.6 18.4 134 Townsend Creek 8700 5.4 6.1 89 6.2 8.2 76 ----- ----- Basin Index (%) 123 117 BIGHORN BASIN Bald Mtn. 9380 17.1 13.8 124 11.6 12.3 94 Bear Trap Meadow 8200 7.4 4.0 185 8.4 5.8 145 Bone Springs Div 9350 15.4 11.2 138 11.1 11.0 101 Grave Springs 8550 5.1 6.0 85 4.2 7.4 57 Kirwin 9550 15.9 6.4 248 14.3 8.3 172 Marquette 8760 4.2 -M * 8.2 -M * Middle Powder 7760 6.7 7.4 91 -M 8.3 * Owl Creek 8975 3.2 3.6 89 5.0 4.1 122 Powder River Pass 9480 13.9 7.5 185 12.4 9.0 138 Shell Creek 9580 17.1 10.5 163 13.0 10.0 130 Timber Creek 7950 2.5 3.1 81 -M 4.9 * ----- ----- Basin Index (%) 142 118 SHOSHONE RIVER Blackwater 9780 28.0 16.3 172 25.7 15.3 168 Evening Star 9200 33.7 18.4 183 30.8 21.0 147 Marquette 8760 4.2 -M * 8.2 -M * Sylvan Road 7120 12.2 8.8 139 17.8 13.4 133 Younts Peak 8350 -M 11.2 * -M 12.1 * ----- ----- Basin Index (%) 170 149 POWDER RIVER Bear Trap Meadow 8200 7.4 4.0 185 8.4 5.8 145 Cloud Peak Reservoir 9860 12.4 9.9 125 10.6 9.0 118 Grave Springs 8550 5.1 6.0 85 4.2 7.4 57 Hansen Sawmill 8360 6.4 4.4 145 7.9 5.7 139 Middle Powder 7760 6.7 7.4 91 -M 8.3 * Powder River Pass 9480 13.9 7.5 185 12.4 9.0 138 Soldier Park 8720 4.6 -M * 7.3 -M * ----- ----- Basin Index (%) 132 118 TONGUE RIVER Big Goose 7990 5.8 5.9 98 6.3 7.5 84 Bone Springs Div 9350 15.4 11.2 138 11.1 11.0 101 Burgess Junction 7880 7.3 7.7 95 6.4 8.5 75 Dome Lake 8880 11.5 8.1 142 9.1 9.5 96 Little Goose 8870 7.1 -M * 8.9 -M * Sucker Creek 8880 8.0 8.3 96 5.7 10.0 57 Tie Creek 6870 3.4 4.1 83 6.4 7.9 81 ----- ----- Basin Index (%) 113 83 BELLE FOURCHE Cole Canyon 5910 5.5 4.7 117 7.4 6.8 109 ----- ----- Basin Index (%) 117 109 CHEYENNE RIVER BASIN Blind Park 6890 6.8 5.9 115 9.2 8.9 103 North Rapid Creek 6130 6.2 5.6 111 6.6 7.2 92 ----- ----- Basin Index (%) 113 98 UPPER N. PLATTE Arapaho Ridge 10960 15.2 15.5 98 14.9 16.7 89 Blackhall Mtn 9820 21.1 -M * 20.8 -M * Columbine 9160 17.1 18.4 93 14.4 19.3 75 Divide Peak 8880 10.2 14.8 69 13.9 16.1 86 Joe Wright 10120 12.5 15.4 81 21.0 18.8 112 Laprele Creek 8375 5.0 7.1 70 6.5 8.9 73 Med Bow 10500 31.6 -M * 26.4 -M * North French Creek 10130 21.0 19.7 107 21.0 19.9 106 Never Summer 10280 13.7 14.8 93 11.2 -M * Old Battle 10000 19.4 22.9 85 18.5 26.7 69 Rawah 9020 8.7 7.8 112 11.6 10.2 114 Sage Creek Basin 7850 7.0 10.4 67 7.8 11.3 69 Sand Lake 10050 20.1 19.6 103 16.7 17.9 93 South Brush Creek 8440 7.9 9.3 85 9.1 11.0 83 Tower 10500 25.4 34.4 74 23.1 30.2 76 Webber Springs 9250 14.5 17.6 82 16.6 20.1 83 Willow Creek Pass 9540 10.2 9.0 113 10.8 9.8 110 Zirkel 9340 20.3 21.9 93 24.7 22.3 111 ----- ----- Basin Index (%) 88 89 SWEETWATER Deer Park 9700 8.0 10.2 78 10.3 14.3 72 Larsen Creek 9000 7.6 8.9 85 8.2 -M * South Pass 9040 8.1 10.6 76 -M 12.8 * ----- ----- Basin Index (%) 80 72* LOWER N. PLATTE Casper Mtn. 7900 6.2 9.5 65 4.6 10.5 44 Laprele Creek 8375 5.0 7.1 70 6.5 8.9 73 Reno Hill 8400 7.1 9.3 76 8.4 10.5 80 Windy Peak 7900 4.5 5.4 83 6.0 7.4 81 ----- ----- Basin Index (%) 73 68 LARAMIE RIVER Brooklyn Lake 10240 19.2 14.4 133 19.8 15.2 130 Cinnabar Park 9574 17.9 16.2 110 20.2 19.0 106 Crow Creek 8330 -M 6.6 * 8.1 7.5 108 Deadman Hill 10220 15.3 11.9 129 14.8 12.1 122 Rawah 9020 8.7 7.8 112 11.6 10.2 114 Roach 9700 11.1 12.0 92 13.7 13.9 99 ----- ----- Basin Index (%) 116 113 S. PLATTE Black Mountain 8920 7.1 -M * 9.9 -M * Crow Creek 8330 -M 6.6 * 8.1 7.5 108 Deadman Hill 10220 15.3 11.9 129 14.8 12.1 122 ----- ----- Basin Index (%) 129* 117 LITTLE SNAKE RIVER Battle Mountain 7440 5.0 9.0 56 6.7 11.6 58 Divide Peak 8880 10.2 14.8 69 13.9 16.1 86 Elk River 8700 11.8 14.2 83 12.5 15.2 82 Little Snake River 8915 16.2 18.9 86 21.6 24.2 89 Old Battle 10000 19.4 22.9 85 18.5 26.7 69 Sage Creek Basin 7850 7.0 10.4 67 7.8 11.3 69 Sandstone RS 8150 7.0 10.2 69 6.2 14.3 43 Whiskey Park 8950 17.5 20.0 88 19.7 21.3 92 ----- ----- Basin Index (%) 78 76 UPPER GREEN RIVER Big Sandy Opening 9080 9.1 9.4 97 9.1 9.9 92 Blind Bull Sum 8650 25.4 17.1 149 15.0 15.2 99 East Rim Divide 7930 9.1 7.5 121 9.1 9.0 101 Elkhart Park G.S. 9400 9.0 8.9 101 8.6 9.9 87 Gros Ventre Summit 8750 10.6 9.3 114 10.6 9.5 112 Gunsight Pass 9820 12.0 10.0 120 12.0 10.2 118 Kendall R.S. 7740 11.6 9.3 125 12.2 11.0 111 Loomis Park 8240 13.2 11.0 120 14.0 13.3 105 New Fork Lake 8340 9.2 7.7 119 -M 8.2 * Pocket Creek 9360 6.3 -M * 6.0 -M * Snider Basin 8060 9.7 9.1 107 11.4 10.9 105 Spring Creek Divide 9000 19.8 17.2 115 18.8 18.3 103 Triple Peak 8500 22.2 16.0 139 24.2 19.0 127 ----- ----- Basin Index (%) 121 106 LOWER GREEN RIVER Blacks Fork Jct 8869 5.1 -M * 7.2 -M * Buck Pasture 9632 8.3 -M * 9.6 -M * EF Blacks Fork GS 9360 6.7 -M * -M -M * Hams Fork 7840 6.7 8.7 77 7.0 8.7 80 Hewinta 9500 5.8 7.3 79 8.3 10.2 81 Hickerson Park 9122 5.3 5.3 100 4.5 7.1 63 Hole-in-Rock 9168 4.5 5.1 88 4.9 6.7 73 Indian Creek 9425 15.4 17.4 89 11.0 16.8 65 Kelley R.S. 8180 9.2 11.0 84 10.5 13.8 76 Spirit Lk 10235 5.7 -M * 6.8 -M * Steel Creek Park 10158 9.8 10.7 92 10.1 11.7 86 ----- ----- Basin Index (%) 87 75 UPPER BEAR RIVER Bear River RS 8777 6.7 -M * 8.1 -M * Bug Lake 7987 11.5 13.8 83 12.1 14.7 82 Burts Miller Ranch 8000 4.2 -M * 4.7 -M * Chalk Creek #1 9171 10.7 17.0 63 11.9 18.6 64 Hayden Fork 9130 9.2 11.4 81 11.5 15.5 74 Kelley R.S. 8180 9.2 11.0 84 10.5 13.8 76 Lily Lake 9133 7.7 9.6 80 8.7 12.6 69 Monte Cristo 8932 14.6 19.6 74 14.5 19.5 74 Salt River Summit 7640 7.6 10.0 76 9.0 12.8 70 ----- ----- Basin Index (%) 76 73 ----------------------------------------------------------------------------- -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.