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: MARCH 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 17.0 14.7 116 18.7 19.0 98 Black Bear 8170 39.4 32.5 121 36.6 34.5 106 Blind Bull Sum 8650 29.6 20.5 144 17.8 17.6 101 Cottonwood Creek 7670 20.0 19.9 101 22.3 21.9 102 East Rim Divide 7930 11.1 9.6 116 10.9 10.6 103 Grand Targhee 9260 41.8 33.0 127 27.1 27.1 100 Granite Creek 6770 16.4 15.0 109 18.3 18.2 101 Grassy Lake 7265 29.3 29.4 100 32.2 32.7 98 Gros Ventre Summit 8750 13.2 11.6 114 12.7 11.5 110 Gunsight Pass 9820 14.5 12.1 120 14.1 12.1 117 Lewis Lake Divide 7850 34.9 27.7 126 35.5 32.1 111 Phillips Bench 8200 23.4 22.4 104 23.9 25.3 94 Salt River Summit 7640 10.0 12.0 83 11.4 15.0 76 Snake River Station 6920 17.0 15.2 112 21.6 20.4 106 Spring Creek Divide 9000 23.8 21.1 113 22.3 21.5 104 Thumb Divide 7980 17.4 14.1 123 16.9 16.5 102 Togwotee Pass 9580 28.7 20.6 139 29.0 21.8 133 Two Ocean Plateau 9240 34.5 24.0 144 27.2 24.4 111 Willow Creek 8080 30.0 25.4 118 31.2 29.9 104 Younts Peak 8350 -M 13.4 * -M 14.1 * ----- ----- Basin Index (%) 119 104 MADISON-GALLATIN Black Bear 8170 39.4 32.5 121 36.6 34.5 106 Canyon 7870 16.0 11.8 136 18.1 14.6 124 Madison Plateau 7750 25.2 20.1 125 24.7 23.7 104 West Yellowstone 6700 12.9 9.9 130 15.9 12.8 124 Whiskey Creek 6800 15.3 14.2 108 17.4 18.2 96 ----- ----- Basin Index (%) 123 109 YELLOWSTONE Beartooth Lake 9360 36.2 19.3 188 31.1 17.7 176 Burnt Mtn 5880 6.7 4.6 146 13.0 10.9 119 Canyon 7870 16.0 11.8 136 18.1 14.6 124 Cole Creek 7850 13.1 12.0 109 8.3 10.7 78 Evening Star 9200 37.2 22.2 168 -M 24.4 * Fisher Creek 9100 48.1 28.2 171 42.3 28.5 148 Northeast Entrance 7350 13.3 9.0 148 16.5 11.0 150 Parker Peak 9400 30.5 17.6 173 26.7 15.7 170 Sylvan Lake 8420 22.9 18.2 126 24.4 20.0 122 Thumb Divide 7980 17.4 14.1 123 16.9 16.5 102 Two Ocean Plateau 9240 34.5 24.0 144 27.2 24.4 111 White Mill 8700 37.6 19.9 189 28.7 21.2 135 Wolverine 7650 20.0 8.9 225 19.2 11.0 175 ----- ----- Basin Index (%) 159 135 WIND RIVER Burroughs Creek 8750 15.1 -M * 16.8 -M * Castle Creek 8400 7.9 -M * 9.0 -M * Cold Springs 9630 8.8 6.3 140 9.0 8.6 105 Deer Park 9700 10.6 13.3 80 13.2 17.2 77 Hobbs Park 10100 14.7 11.8 125 12.7 11.1 114 Kirwin 9550 18.0 8.4 214 16.4 10.0 164 Little Warm 9370 14.2 9.2 154 14.7 11.2 131 Owl Creek 8975 3.7 4.6 80 5.4 5.0 108 South Pass 9040 10.3 13.8 75 -M 15.4 * St. Lawrence Alt 8620 3.0 6.1 49 7.3 7.5 97 Togwotee Pass 9580 28.7 20.6 139 29.0 21.8 133 Townsend Creek 8700 6.3 8.2 77 7.6 10.1 75 ----- ----- Basin Index (%) 116 112 BIGHORN BASIN Bald Mtn. 9380 18.6 16.5 113 12.9 14.9 87 Bear Trap Meadow 8200 8.4 5.1 165 8.8 7.1 124 Bone Springs Div 9350 16.7 14.1 118 12.5 13.4 93 Grave Springs 8550 6.0 8.1 74 4.5 9.0 50 Kirwin 9550 18.0 8.4 214 16.4 10.0 164 Marquette 8760 5.1 -M * 8.8 -M * Middle Powder 7760 7.9 9.8 81 -M 10.0 * Owl Creek 8975 3.7 4.6 80 5.4 5.0 108 Powder River Pass 9480 14.8 9.2 161 13.6 10.8 126 Shell Creek 9580 18.6 12.8 145 14.0 11.9 118 Timber Creek 7950 2.9 4.2 69 -M 6.1 * ----- ----- Basin Index (%) 125 107 SHOSHONE RIVER Blackwater 9780 31.6 20.8 152 29.3 18.1 162 Evening Star 9200 37.2 22.2 168 -M 24.4 * Marquette 8760 5.1 -M * 8.8 -M * Sylvan Road 7120 13.5 10.4 130 19.6 15.1 130 Younts Peak 8350 -M 13.4 * -M 14.1 * ----- ----- Basin Index (%) 154 147* POWDER RIVER Bear Trap Meadow 8200 8.4 5.1 165 8.8 7.1 124 Cloud Peak Reservoir 9860 13.5 12.9 105 12.0 11.2 107 Grave Springs 8550 6.0 8.1 74 4.5 9.0 50 Hansen Sawmill 8360 6.7 5.7 118 8.1 7.1 114 Middle Powder 7760 7.9 9.8 81 -M 10.0 * Powder River Pass 9480 14.8 9.2 161 13.6 10.8 126 Soldier Park 8720 5.4 -M * 8.0 -M * ----- ----- Basin Index (%) 113 104 TONGUE RIVER Big Goose 7990 6.5 7.8 83 6.8 9.2 74 Bone Springs Div 9350 16.7 14.1 118 12.5 13.4 93 Burgess Junction 7880 8.1 9.5 85 6.9 10.5 66 Dome Lake 8880 12.9 10.2 126 9.8 11.5 85 Little Goose 8870 7.9 -M * 10.0 -M * Sucker Creek 8880 8.8 10.9 81 6.6 12.2 54 Tie Creek 6870 3.8 5.0 76 7.3 9.8 74 ----- ----- Basin Index (%) 99 75 BELLE FOURCHE Cole Canyon 5910 6.6 5.5 120 8.1 7.9 103 ----- ----- Basin Index (%) 120 103 CHEYENNE RIVER BASIN Blind Park 6890 7.1 7.2 99 10.0 10.5 95 North Rapid Creek 6130 6.9 6.5 106 7.4 8.6 86 ----- ----- Basin Index (%) 102 91 UPPER N. PLATTE Arapaho Ridge 10960 17.2 18.0 96 16.9 19.7 86 Blackhall Mtn 9820 24.3 -M * 23.8 -M * Columbine 9160 20.5 22.0 93 20.6 22.9 90 Divide Peak 8880 12.8 17.6 73 16.3 19.1 85 Joe Wright 10120 15.8 19.1 83 25.1 22.9 110 Laprele Creek 8375 5.8 9.1 64 7.1 10.8 66 Med Bow 10500 35.9 -M * 28.8 -M * North French Creek 10130 24.1 25.2 96 23.6 23.7 100 Never Summer 10280 16.6 17.8 93 13.7 -M * Old Battle 10000 22.1 26.3 84 21.3 31.4 68 Rawah 9020 9.8 9.4 104 13.2 12.2 108 Sage Creek Basin 7850 8.8 11.5 77 9.5 12.9 74 Sand Lake 10050 23.1 24.6 94 19.5 21.7 90 South Brush Creek 8440 9.2 11.1 83 10.2 13.3 77 Tower 10500 30.2 40.0 76 26.1 35.8 73 Webber Springs 9250 16.6 21.0 79 19.2 23.9 80 Willow Creek Pass 9540 11.9 10.9 109 12.7 11.7 109 Zirkel 9340 24.3 25.7 95 27.7 25.5 109 ----- ----- Basin Index (%) 87 87 SWEETWATER Deer Park 9700 10.6 13.3 80 13.2 17.2 77 Larsen Creek 9000 10.3 11.2 92 10.2 -M * South Pass 9040 10.3 13.8 75 -M 15.4 * ----- ----- Basin Index (%) 81 77* LOWER N. PLATTE Casper Mtn. 7900 7.3 12.2 60 5.6 12.8 44 Laprele Creek 8375 5.8 9.1 64 7.1 10.8 66 Reno Hill 8400 8.9 11.9 75 9.9 13.0 76 Windy Peak 7900 5.7 7.1 80 7.1 9.1 78 ----- ----- Basin Index (%) 69 65 LARAMIE RIVER Brooklyn Lake 10240 21.6 17.7 122 21.9 18.5 118 Cinnabar Park 9574 19.3 18.0 107 22.2 21.4 104 Crow Creek 8330 3.7 6.9 54 9.7 8.9 109 Deadman Hill 10220 18.2 13.9 131 17.4 15.0 116 Rawah 9020 9.8 9.4 104 13.2 12.2 108 Roach 9700 12.2 14.0 87 15.2 16.9 90 ----- ----- Basin Index (%) 106 107 S. PLATTE Black Mountain 8920 9.6 -M * 12.2 -M * Crow Creek 8330 3.7 6.9 54 9.7 8.9 109 Deadman Hill 10220 18.2 13.9 131 17.4 15.0 116 ----- ----- Basin Index (%) 105 113 LITTLE SNAKE RIVER Battle Mountain 7440 6.4 11.4 56 9.0 13.6 66 Divide Peak 8880 12.8 17.6 73 16.3 19.1 85 Elk River 8700 13.4 17.4 77 14.1 18.0 78 Little Snake River 8915 18.6 21.1 88 24.3 26.5 92 Old Battle 10000 22.1 26.3 84 21.3 31.4 68 Sage Creek Basin 7850 8.8 11.5 77 9.5 12.9 74 Sandstone RS 8150 8.0 12.2 66 7.5 16.7 45 Whiskey Park 8950 21.1 24.3 87 22.3 25.0 89 ----- ----- Basin Index (%) 78 76 UPPER GREEN RIVER Big Sandy Opening 9080 11.7 11.7 100 11.6 11.8 98 Blind Bull Sum 8650 29.6 20.5 144 17.8 17.6 101 East Rim Divide 7930 11.1 9.6 116 10.9 10.6 103 Elkhart Park G.S. 9400 11.2 10.7 105 10.8 11.8 92 Gros Ventre Summit 8750 13.2 11.6 114 12.7 11.5 110 Gunsight Pass 9820 14.5 12.1 120 14.1 12.1 117 Kendall R.S. 7740 13.6 11.3 120 13.9 13.0 107 Loomis Park 8240 16.0 13.3 120 16.6 15.6 106 New Fork Lake 8340 11.1 9.3 119 -M 9.7 * Pocket Creek 9360 7.9 -M * 7.9 -M * Snider Basin 8060 12.2 11.0 111 13.7 12.8 107 Spring Creek Divide 9000 23.8 21.1 113 22.3 21.5 104 Triple Peak 8500 26.2 19.5 134 27.9 22.7 123 ----- ----- Basin Index (%) 120 107 LOWER GREEN RIVER Blacks Fork Jct 8869 6.9 -M * 8.2 -M * Buck Pasture 9632 10.7 -M * 11.7 -M * EF Blacks Fork GS 9360 10.2 -M * -M -M * Hams Fork 7840 8.6 10.3 83 8.6 10.2 84 Hewinta 9500 7.9 9.9 80 10.3 12.3 84 Hickerson Park 9122 7.6 6.6 115 7.0 8.9 79 Hole-in-Rock 9168 6.9 6.6 105 7.4 8.3 89 Indian Creek 9425 19.5 21.3 92 14.3 20.2 71 Kelley R.S. 8180 12.3 13.4 92 13.4 16.2 83 Spirit Lk 10235 9.2 -M * 10.6 -M * Steel Creek Park 10158 12.5 13.4 93 12.6 14.3 88 ----- ----- Basin Index (%) 92 81 UPPER BEAR RIVER Bear River RS 8777 8.1 -M * 9.6 -M * Bug Lake 7987 14.2 16.7 85 14.4 17.4 83 Burts Miller Ranch 8000 5.2 -M * 5.8 -M * Chalk Creek #1 9171 13.5 21.2 64 14.6 22.2 66 Hayden Fork 9130 11.4 14.3 80 14.1 18.6 76 Kelley R.S. 8180 12.3 13.4 92 13.4 16.2 83 Lily Lake 9133 8.4 11.4 74 10.3 15.0 69 Monte Cristo 8932 19.1 24.4 78 18.1 23.1 78 Salt River Summit 7640 10.0 12.0 83 11.4 15.0 76 ----- ----- Basin Index (%) 78 76 ----------------------------------------------------------------------------- -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.