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: FEBRUARY 20 , 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 16.3 99 Black Bear 8170 32.4 27.8 117 30.5 29.0 105 Blind Bull Sum 8650 25.4 16.9 150 15.1 15.1 100 Cottonwood Creek 7670 16.8 15.5 108 18.5 18.4 101 East Rim Divide 7930 9.2 7.5 123 9.2 8.9 103 Grand Targhee 9260 35.3 27.6 128 23.2 23.7 98 Granite Creek 6770 14.0 13.0 108 16.3 15.6 104 Grassy Lake 7265 24.1 24.7 98 27.1 27.9 97 Gros Ventre Summit 8750 10.6 9.2 115 10.6 9.5 112 Gunsight Pass 9820 12.1 9.9 122 12.0 10.2 118 Lewis Lake Divide 7850 29.5 24.2 122 27.7 27.3 101 Phillips Bench 8200 18.8 18.6 101 20.0 21.3 94 Salt River Summit 7640 7.6 9.8 78 9.2 12.6 73 Snake River Station 6920 14.6 13.6 107 19.1 17.7 108 Spring Creek Divide 9000 19.7 17.0 116 18.8 18.2 103 Thumb Divide 7980 14.5 11.1 131 14.7 13.8 107 Togwotee Pass 9580 24.1 16.8 143 24.6 18.3 134 Two Ocean Plateau 9240 30.6 20.2 151 20.2 20.4 99 Willow Creek 8080 24.6 20.5 120 26.8 25.1 107 Younts Peak 8350 -M 11.1 * -M 12.0 * ----- ----- Basin Index (%) 119 103 MADISON-GALLATIN Black Bear 8170 32.4 27.8 117 30.5 29.0 105 Canyon 7870 14.3 9.8 146 15.9 12.4 128 Madison Plateau 7750 20.4 16.5 124 20.4 19.8 103 West Yellowstone 6700 10.4 8.1 128 13.3 11.0 121 Whiskey Creek 6800 11.9 11.3 105 14.1 15.3 92 ----- ----- Basin Index (%) 122 108 YELLOWSTONE Beartooth Lake 9360 32.9 15.7 210 28.5 14.9 191 Burnt Mtn 5880 5.9 3.8 155 12.0 8.9 135 Canyon 7870 14.3 9.8 146 15.9 12.4 128 Cole Creek 7850 11.1 8.9 125 7.2 8.6 84 Evening Star 9200 33.8 18.3 185 30.8 20.9 147 Fisher Creek 9100 42.9 24.4 176 37.2 24.0 155 Northeast Entrance 7350 12.2 7.5 163 15.1 9.4 161 Parker Peak 9400 27.4 14.7 186 21.8 13.2 165 Sylvan Lake 8420 19.8 14.9 133 21.2 17.0 125 Thumb Divide 7980 14.5 11.1 131 14.7 13.8 107 Two Ocean Plateau 9240 30.6 20.2 151 20.2 20.4 99 White Mill 8700 34.5 17.0 203 25.3 18.0 141 Wolverine 7650 17.4 8.2 212 17.2 9.4 183 ----- ----- Basin Index (%) 170 140 WIND RIVER Burroughs Creek 8750 13.1 -M * 14.4 -M * Castle Creek 8400 7.2 -M * 8.3 -M * Cold Springs 9630 7.4 5.3 140 7.7 7.0 110 Deer Park 9700 8.0 10.1 79 10.3 14.3 72 Hobbs Park 10100 12.7 9.0 141 10.7 8.9 120 Kirwin 9550 15.9 6.4 248 14.4 8.3 173 Little Warm 9370 12.5 7.6 164 12.9 9.3 139 Owl Creek 8975 3.2 3.5 91 4.9 4.0 122 South Pass 9040 8.0 10.6 75 -M 12.7 * St. Lawrence Alt 8620 2.4 4.8 50 6.8 6.1 111 Togwotee Pass 9580 24.1 16.8 143 24.6 18.3 134 Townsend Creek 8700 5.5 6.0 92 6.2 8.2 76 ----- ----- Basin Index (%) 124 117 BIGHORN BASIN Bald Mtn. 9380 17.0 13.7 124 11.6 12.2 95 Bear Trap Meadow 8200 7.3 3.9 187 8.4 5.8 145 Bone Springs Div 9350 15.4 11.2 138 11.1 11.0 101 Grave Springs 8550 5.1 5.9 86 4.2 7.4 57 Kirwin 9550 15.9 6.4 248 14.4 8.3 173 Marquette 8760 -M -M * 8.0 -M * Middle Powder 7760 6.6 7.4 89 -M 8.2 * Owl Creek 8975 3.2 3.5 91 4.9 4.0 122 Powder River Pass 9480 13.9 7.4 188 12.4 9.0 138 Shell Creek 9580 17.2 10.5 164 12.8 9.9 129 Timber Creek 7950 2.5 3.1 81 -M 4.9 * ----- ----- Basin Index (%) 143 118 SHOSHONE RIVER Blackwater 9780 28.0 16.2 173 25.7 15.2 169 Evening Star 9200 33.8 18.3 185 30.8 20.9 147 Marquette 8760 -M -M * 8.0 -M * Sylvan Road 7120 12.2 8.8 139 17.7 13.3 133 Younts Peak 8350 -M 11.1 * -M 12.0 * ----- ----- Basin Index (%) 171 150 POWDER RIVER Bear Trap Meadow 8200 7.3 3.9 187 8.4 5.8 145 Cloud Peak Reservoir 9860 12.4 9.9 125 10.5 9.0 117 Grave Springs 8550 5.1 5.9 86 4.2 7.4 57 Hansen Sawmill 8360 6.4 4.4 145 7.8 5.7 137 Middle Powder 7760 6.6 7.4 89 -M 8.2 * Powder River Pass 9480 13.9 7.4 188 12.4 9.0 138 Soldier Park 8720 4.3 -M * 7.2 -M * ----- ----- Basin Index (%) 133 117 TONGUE RIVER Big Goose 7990 5.6 5.9 95 6.1 7.5 81 Bone Springs Div 9350 15.4 11.2 138 11.1 11.0 101 Burgess Junction 7880 7.3 7.6 96 6.3 8.5 74 Dome Lake 8880 11.4 8.0 142 9.1 9.4 97 Little Goose 8870 6.9 -M * 8.8 -M * Sucker Creek 8880 8.0 8.2 98 5.6 9.9 57 Tie Creek 6870 3.4 4.1 83 6.1 7.9 77 ----- ----- Basin Index (%) 114 82 BELLE FOURCHE Cole Canyon 5910 5.5 4.7 117 7.1 6.8 104 ----- ----- Basin Index (%) 117 104 CHEYENNE RIVER BASIN Blind Park 6890 6.9 5.8 119 9.1 8.9 102 North Rapid Creek 6130 6.3 5.6 112 6.5 7.2 90 ----- ----- Basin Index (%) 116 97 UPPER N. PLATTE Arapaho Ridge 10960 15.2 15.3 99 15.0 16.6 90 Blackhall Mtn 9820 21.1 -M * 20.9 -M * Columbine 9160 17.1 18.2 94 -M 19.1 * Divide Peak 8880 10.1 14.6 69 13.8 16.0 86 Joe Wright 10120 12.6 15.3 82 21.2 18.6 114 Laprele Creek 8375 5.0 7.0 71 6.4 8.8 73 Med Bow 10500 31.5 -M * 26.6 -M * North French Creek 10130 21.0 19.6 107 21.0 19.8 106 Never Summer 10280 13.8 14.7 94 11.2 -M * Old Battle 10000 19.4 22.8 85 18.7 26.4 71 Rawah 9020 8.7 7.7 113 11.8 10.1 117 Sage Creek Basin 7850 6.9 10.2 68 7.8 11.3 69 Sand Lake 10050 20.2 19.4 104 16.7 17.8 94 South Brush Creek 8440 7.9 9.1 87 9.1 10.9 83 Tower 10500 25.4 34.0 75 23.2 29.9 78 Webber Springs 9250 14.6 17.4 84 16.7 19.9 84 Willow Creek Pass 9540 10.2 8.9 115 10.8 9.7 111 Zirkel 9340 20.3 21.7 94 24.6 22.2 111 ----- ----- Basin Index (%) 89 91 SWEETWATER Deer Park 9700 8.0 10.1 79 10.3 14.3 72 Larsen Creek 9000 7.6 8.8 86 8.2 -M * South Pass 9040 8.0 10.6 75 -M 12.7 * ----- ----- Basin Index (%) 80 72* LOWER N. PLATTE Casper Mtn. 7900 6.2 9.4 66 4.3 10.4 41 Laprele Creek 8375 5.0 7.0 71 6.4 8.8 73 Reno Hill 8400 6.9 9.2 75 8.3 10.5 79 Windy Peak 7900 4.3 5.4 80 5.7 7.4 77 ----- ----- Basin Index (%) 72 67 LARAMIE RIVER Brooklyn Lake 10240 19.3 14.3 135 19.8 15.0 132 Cinnabar Park 9574 18.0 16.2 111 20.4 18.9 108 Crow Creek 8330 -M 6.6 * 8.1 7.4 109 Deadman Hill 10220 15.4 11.8 131 14.8 11.9 124 Rawah 9020 8.7 7.7 113 11.8 10.1 117 Roach 9700 11.1 11.9 93 13.7 13.8 99 ----- ----- Basin Index (%) 117 115 S. PLATTE Black Mountain 8920 7.1 -M * 9.9 -M * Crow Creek 8330 -M 6.6 * 8.1 7.4 109 Deadman Hill 10220 15.4 11.8 131 14.8 11.9 124 ----- ----- Basin Index (%) 131* 119 LITTLE SNAKE RIVER Battle Mountain 7440 5.1 8.9 57 -M 11.4 * Divide Peak 8880 10.1 14.6 69 13.8 16.0 86 Elk River 8700 11.7 14.1 83 12.4 15.1 82 Little Snake River 8915 16.3 18.8 87 21.5 24.1 89 Old Battle 10000 19.4 22.8 85 18.7 26.4 71 Sage Creek Basin 7850 6.9 10.2 68 7.8 11.3 69 Sandstone RS 8150 7.0 10.2 69 6.2 14.2 44 Whiskey Park 8950 17.4 19.8 88 19.5 21.1 92 ----- ----- Basin Index (%) 79 78 UPPER GREEN RIVER Big Sandy Opening 9080 9.2 9.3 99 9.2 9.8 94 Blind Bull Sum 8650 25.4 16.9 150 15.1 15.1 100 East Rim Divide 7930 9.2 7.5 123 9.2 8.9 103 Elkhart Park G.S. 9400 9.1 8.8 103 8.6 9.8 88 Gros Ventre Summit 8750 10.6 9.2 115 10.6 9.5 112 Gunsight Pass 9820 12.1 9.9 122 12.0 10.2 118 Kendall R.S. 7740 11.7 9.2 127 12.1 10.9 111 Loomis Park 8240 13.2 10.9 121 14.0 13.2 106 New Fork Lake 8340 9.3 7.6 122 8.3 8.2 101 Pocket Creek 9360 6.4 -M * 6.1 -M * Snider Basin 8060 9.8 9.1 108 11.4 10.8 106 Spring Creek Divide 9000 19.7 17.0 116 18.8 18.2 103 Triple Peak 8500 22.3 15.8 141 24.2 18.8 129 ----- ----- Basin Index (%) 123 107 LOWER GREEN RIVER Blacks Fork Jct 8869 5.5 -M * 7.0 -M * Buck Pasture 9632 8.5 -M * 9.5 -M * EF Blacks Fork GS 9360 6.9 -M * 4.7 -M * Hams Fork 7840 6.8 8.6 79 7.6 8.6 88 Hewinta 9500 5.8 7.2 81 8.4 10.1 83 Hickerson Park 9122 5.5 5.3 104 4.7 7.1 66 Hole-in-Rock 9168 4.7 5.0 94 5.3 6.7 79 Indian Creek 9425 15.5 17.2 90 11.1 16.7 66 Kelley R.S. 8180 9.2 11.0 84 10.5 13.7 77 Spirit Lk 10235 5.9 -M * 6.8 -M * Steel Creek Park 10158 9.9 10.6 93 10.2 11.6 88 ----- ----- Basin Index (%) 88 78 UPPER BEAR RIVER Bear River RS 8777 6.8 -M * 8.2 -M * Bug Lake 7987 11.5 13.7 84 12.1 14.6 83 Burts Miller Ranch 8000 4.2 -M * 5.0 -M * Chalk Creek #1 9171 10.7 16.8 64 11.9 18.4 65 Hayden Fork 9130 9.1 11.3 81 11.5 15.4 75 Kelley R.S. 8180 9.2 11.0 84 10.5 13.7 77 Lily Lake 9133 7.8 9.4 83 8.6 12.5 69 Monte Cristo 8932 14.5 19.4 75 14.4 19.3 75 Salt River Summit 7640 7.6 9.8 78 9.2 12.6 73 ----- ----- Basin Index (%) 77 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.