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 28 , 2018 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 15.6 13.4 116 17.0 17.1 99 Black Bear 8170 35.8 29.2 123 33.6 30.6 110 Blind Bull Sum 8650 26.5 17.6 151 16.0 15.9 101 Cottonwood Creek 7670 17.6 16.6 106 19.3 19.5 99 East Rim Divide 7930 9.9 8.0 124 9.8 9.5 103 Grand Targhee 9260 36.8 29.7 124 24.0 24.7 97 Granite Creek 6770 14.9 13.6 110 16.9 16.4 103 Grassy Lake 7265 26.2 25.9 101 29.4 29.3 100 Gros Ventre Summit 8750 10.6 9.6 110 10.8 10.0 108 Gunsight Pass 9820 12.4 10.5 118 12.3 10.8 114 Lewis Lake Divide 7850 32.2 25.1 128 -M 28.6 * Phillips Bench 8200 19.9 19.5 102 20.9 22.6 92 Salt River Summit 7640 8.3 10.5 79 10.1 13.4 75 Snake River Station 6920 15.6 14.1 111 19.9 18.5 108 Spring Creek Divide 9000 21.1 18.3 115 20.0 19.1 105 Thumb Divide 7980 15.3 12.1 126 15.5 14.5 107 Togwotee Pass 9580 24.9 17.5 142 25.5 19.3 132 Two Ocean Plateau 9240 31.5 21.4 147 20.3 21.5 94 Willow Creek 8080 26.0 22.1 118 28.2 26.7 106 Younts Peak 8350 -M 11.6 * -M 12.6 * ----- ----- Basin Index (%) 120 103 MADISON-GALLATIN Black Bear 8170 35.8 29.2 123 33.6 30.6 110 Canyon 7870 14.8 10.4 142 16.7 13.0 128 Madison Plateau 7750 22.9 17.7 129 22.4 21.1 106 West Yellowstone 6700 11.7 8.9 131 14.6 11.6 126 Whiskey Creek 6800 13.6 12.0 113 15.8 16.2 98 ----- ----- Basin Index (%) 126 111 YELLOWSTONE Beartooth Lake 9360 34.3 16.4 209 29.0 15.6 186 Burnt Mtn 5880 6.4 4.0 160 12.4 9.2 135 Canyon 7870 14.8 10.4 142 16.7 13.0 128 Cole Creek 7850 11.4 9.6 119 7.7 9.0 86 Evening Star 9200 34.8 18.9 184 31.0 22.0 141 Fisher Creek 9100 44.9 25.5 176 39.1 25.4 154 Northeast Entrance 7350 12.6 8.0 158 15.5 9.8 158 Parker Peak 9400 28.5 15.9 179 22.6 14.0 161 Sylvan Lake 8420 20.4 15.7 130 21.9 17.9 122 Thumb Divide 7980 15.3 12.1 126 15.5 14.5 107 Two Ocean Plateau 9240 31.5 21.4 147 20.3 21.5 94 White Mill 8700 35.8 18.1 198 26.6 18.8 141 Wolverine 7650 18.8 8.5 221 18.0 9.9 182 ----- ----- Basin Index (%) 168 138 WIND RIVER Burroughs Creek 8750 13.9 -M * 15.7 -M * Castle Creek 8400 7.4 -M * 8.6 -M * Cold Springs 9630 7.7 5.4 143 8.4 7.4 114 Deer Park 9700 9.1 10.8 84 11.8 15.1 78 Hobbs Park 10100 13.5 9.5 142 11.6 9.4 123 Kirwin 9550 16.4 6.9 238 14.8 8.7 170 Little Warm 9370 12.9 7.8 165 13.4 9.8 137 Owl Creek 8975 3.4 3.9 87 5.2 4.3 121 South Pass 9040 9.2 11.3 81 -M 13.3 * St. Lawrence Alt 8620 2.8 5.0 56 7.0 6.4 109 Togwotee Pass 9580 24.9 17.5 142 25.5 19.3 132 Townsend Creek 8700 6.0 6.3 95 7.2 8.5 85 ----- ----- Basin Index (%) 125 118 BIGHORN BASIN Bald Mtn. 9380 17.3 14.5 119 12.1 13.0 93 Bear Trap Meadow 8200 -M 4.3 * 8.5 6.1 139 Bone Springs Div 9350 15.5 11.7 132 11.6 11.7 99 Grave Springs 8550 5.3 6.7 79 4.4 7.8 56 Kirwin 9550 16.4 6.9 238 14.8 8.7 170 Marquette 8760 4.3 -M * 8.0 -M * Middle Powder 7760 6.9 7.9 87 -M 8.7 * Owl Creek 8975 3.4 3.9 87 5.2 4.3 121 Powder River Pass 9480 14.1 7.9 178 12.8 9.5 135 Shell Creek 9580 17.4 11.4 153 13.3 10.5 127 Timber Creek 7950 2.7 3.4 79 -M 5.2 * ----- ----- Basin Index (%) 133 116 SHOSHONE RIVER Blackwater 9780 28.7 17.0 169 26.7 16.0 167 Evening Star 9200 34.8 18.9 184 31.0 22.0 141 Marquette 8760 4.3 -M * 8.0 -M * Sylvan Road 7120 12.9 9.3 139 18.1 13.8 131 Younts Peak 8350 -M 11.6 * -M 12.6 * ----- ----- Basin Index (%) 169 146 POWDER RIVER Bear Trap Meadow 8200 -M 4.3 * 8.5 6.1 139 Cloud Peak Reservoir 9860 12.7 10.3 123 11.2 9.5 118 Grave Springs 8550 5.3 6.7 79 4.4 7.8 56 Hansen Sawmill 8360 6.6 4.6 143 8.0 6.0 133 Middle Powder 7760 6.9 7.9 87 -M 8.7 * Powder River Pass 9480 14.1 7.9 178 12.8 9.5 135 Soldier Park 8720 5.4 -M * 7.6 -M * ----- ----- Basin Index (%) 122 115 TONGUE RIVER Big Goose 7990 6.0 6.1 98 6.5 7.7 84 Bone Springs Div 9350 15.5 11.7 132 11.6 11.7 99 Burgess Junction 7880 7.4 8.2 90 6.7 8.9 75 Dome Lake 8880 11.9 8.5 140 9.3 9.9 94 Little Goose 8870 7.3 -M * 9.3 -M * Sucker Creek 8880 8.3 8.8 94 6.3 10.5 60 Tie Creek 6870 3.5 4.2 83 6.8 8.2 83 ----- ----- Basin Index (%) 111 83 BELLE FOURCHE Cole Canyon 5910 5.4 5.0 108 7.5 7.0 107 ----- ----- Basin Index (%) 108 107 CHEYENNE RIVER BASIN Blind Park 6890 6.9 6.4 108 9.3 9.3 100 North Rapid Creek 6130 6.4 5.8 110 6.8 7.5 91 ----- ----- Basin Index (%) 109 96 UPPER N. PLATTE Arapaho Ridge 10960 16.0 16.4 98 15.7 17.5 90 Blackhall Mtn 9820 22.2 -M * 21.8 -M * Columbine 9160 18.3 19.6 93 19.0 20.2 94 Divide Peak 8880 10.9 15.5 70 14.6 16.7 87 Joe Wright 10120 13.3 16.4 81 22.1 19.8 112 Laprele Creek 8375 5.3 7.7 69 6.8 9.2 74 Med Bow 10500 32.6 -M * 27.0 -M * North French Creek 10130 21.8 20.9 104 21.6 20.9 103 Never Summer 10280 14.5 16.0 91 11.6 -M * Old Battle 10000 20.5 23.8 86 19.8 27.7 71 Rawah 9020 9.0 8.6 105 12.2 10.8 113 Sage Creek Basin 7850 7.5 10.5 71 8.2 11.6 71 Sand Lake 10050 21.1 21.0 100 17.7 18.7 95 South Brush Creek 8440 7.9 10.1 78 9.5 11.7 81 Tower 10500 27.1 35.8 76 24.7 31.6 78 Webber Springs 9250 15.3 18.5 83 17.8 21.0 85 Willow Creek Pass 9540 10.7 9.4 114 11.2 10.2 110 Zirkel 9340 21.4 22.8 94 25.7 23.3 110 ----- ----- Basin Index (%) 88 91 SWEETWATER Deer Park 9700 9.1 10.8 84 11.8 15.1 78 Larsen Creek 9000 9.1 9.4 97 9.2 -M * South Pass 9040 9.2 11.3 81 -M 13.3 * ----- ----- Basin Index (%) 87 78* LOWER N. PLATTE Casper Mtn. 7900 6.3 10.0 63 5.2 11.0 47 Laprele Creek 8375 5.3 7.7 69 6.8 9.2 74 Reno Hill 8400 7.7 9.8 79 8.7 11.0 79 Windy Peak 7900 5.0 5.7 88 6.5 7.7 84 ----- ----- Basin Index (%) 73 70 LARAMIE RIVER Brooklyn Lake 10240 19.8 14.8 134 20.3 15.9 128 Cinnabar Park 9574 18.4 16.9 109 20.6 19.6 105 Crow Creek 8330 -M 6.7 * 8.2 7.7 106 Deadman Hill 10220 15.9 12.4 128 15.2 12.6 121 Rawah 9020 9.0 8.6 105 12.2 10.8 113 Roach 9700 11.3 12.3 92 14.2 14.6 97 ----- ----- Basin Index (%) 114 112 S. PLATTE Black Mountain 8920 7.5 -M * 10.2 -M * Crow Creek 8330 -M 6.7 * 8.2 7.7 106 Deadman Hill 10220 15.9 12.4 128 15.2 12.6 121 ----- ----- Basin Index (%) 128* 115 LITTLE SNAKE RIVER Battle Mountain 7440 5.4 9.8 55 7.0 12.1 58 Divide Peak 8880 10.9 15.5 70 14.6 16.7 87 Elk River 8700 12.2 15.2 80 13.2 15.8 84 Little Snake River 8915 17.4 19.6 89 22.8 24.9 92 Old Battle 10000 20.5 23.8 86 19.8 27.7 71 Sage Creek Basin 7850 7.5 10.5 71 8.2 11.6 71 Sandstone RS 8150 7.4 10.3 72 6.9 15.0 46 Whiskey Park 8950 18.8 21.2 89 20.7 22.2 93 ----- ----- Basin Index (%) 80 78 UPPER GREEN RIVER Big Sandy Opening 9080 10.2 9.9 103 10.2 10.4 98 Blind Bull Sum 8650 26.5 17.6 151 16.0 15.9 101 East Rim Divide 7930 9.9 8.0 124 9.8 9.5 103 Elkhart Park G.S. 9400 9.8 9.3 105 9.4 10.4 90 Gros Ventre Summit 8750 10.6 9.6 110 10.8 10.0 108 Gunsight Pass 9820 12.4 10.5 118 12.3 10.8 114 Kendall R.S. 7740 12.5 9.7 129 12.9 11.6 111 Loomis Park 8240 14.2 11.6 122 15.0 14.0 107 New Fork Lake 8340 9.8 8.1 121 9.0 8.7 103 Pocket Creek 9360 6.9 -M * 6.7 -M * Snider Basin 8060 10.6 9.5 112 12.4 11.5 108 Spring Creek Divide 9000 21.1 18.3 115 20.0 19.1 105 Triple Peak 8500 23.3 16.6 140 25.2 20.1 125 ----- ----- Basin Index (%) 123 107 LOWER GREEN RIVER Blacks Fork Jct 8869 5.6 -M * 7.1 -M * Buck Pasture 9632 8.6 -M * 9.8 -M * EF Blacks Fork GS 9360 7.0 -M * 4.6 -M * Hams Fork 7840 7.5 9.1 82 7.4 9.1 81 Hewinta 9500 6.0 7.8 77 8.6 10.7 80 Hickerson Park 9122 5.7 5.8 98 5.1 7.5 68 Hole-in-Rock 9168 4.9 5.5 89 5.4 7.0 77 Indian Creek 9425 16.7 18.7 89 12.3 17.7 69 Kelley R.S. 8180 10.1 12.0 84 11.5 14.5 79 Spirit Lk 10235 6.4 -M * 7.4 -M * Steel Creek Park 10158 10.2 11.4 89 10.5 12.3 85 ----- ----- Basin Index (%) 87 77 UPPER BEAR RIVER Bear River RS 8777 6.9 -M * 8.3 -M * Bug Lake 7987 12.5 14.6 86 12.9 15.4 84 Burts Miller Ranch 8000 4.0 -M * 5.1 -M * Chalk Creek #1 9171 11.0 18.1 61 12.3 19.3 64 Hayden Fork 9130 9.3 11.9 78 11.9 16.3 73 Kelley R.S. 8180 10.1 12.0 84 11.5 14.5 79 Lily Lake 9133 8.0 10.1 79 8.8 13.1 67 Monte Cristo 8932 15.6 20.6 76 15.5 20.4 76 Salt River Summit 7640 8.3 10.5 79 10.1 13.4 75 ----- ----- Basin Index (%) 76 74 ----------------------------------------------------------------------------- -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.