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: APRIL 25 , 2020 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 15.5 10.8 144 20.5 22.1 93 Black Bear 8170 -M 36.9 * 34.1 40.7 84 Blind Bull Sum 8650 29.5 24.3 121 17.6 20.7 85 Cottonwood Creek 7670 25.8 17.3 149 32.1 26.5 121 East Rim Divide 7930 9.7 9.0 108 11.4 12.4 92 Grand Targhee 9260 46.9 43.1 109 33.6 33.5 100 Granite Creek 6770 17.6 9.5 185 18.7 20.6 91 Grassy Lake 7265 32.6 30.2 108 35.9 38.2 94 Gros Ventre Summit 8750 14.0 12.5 112 14.8 14.0 106 Gunsight Pass 9820 14.9 13.5 110 15.5 15.4 101 Lewis Lake Divide 7850 28.6 30.7 93 33.6 37.5 90 Phillips Bench 8200 -M 25.4 * -M 29.8 * Salt River Summit 7640 13.5 8.5 159 17.5 17.8 98 Snake River Station 6920 15.5 10.1 153 23.3 24.0 97 Spring Creek Divide 9000 28.8 23.7 122 27.0 25.4 106 Thumb Divide 7980 16.6 14.2 117 18.2 20.2 90 Togwotee Pass 9580 29.5 24.4 121 29.4 26.3 112 Two Ocean Plateau 9240 34.7 29.0 120 28.2 29.2 97 Willow Creek 8080 39.6 25.7 154 39.7 36.3 109 Younts Peak 8350 18.3 15.1 121 15.9 17.0 94 ----- ----- Basin Index (%) 123 98 MADISON-GALLATIN Black Bear 8170 -M 36.9 * 34.1 40.7 84 Canyon 7870 14.8 11.7 126 16.2 17.4 93 Madison Plateau 7750 21.9 22.6 97 20.7 28.0 74 West Yellowstone 6700 5.2 5.1 102 9.6 15.4 62 Whiskey Creek 6800 15.0 15.5 97 18.5 21.7 85 ----- ----- Basin Index (%) 104 80 YELLOWSTONE Beartooth Lake 9360 25.2 23.6 107 23.6 21.2 111 Burnt Mtn 5880 7.2 .0 * 16.5 14.9 111 Canyon 7870 14.8 11.7 126 16.2 17.4 93 Cole Creek 7850 20.5 16.3 126 16.0 15.2 105 Evening Star 9200 29.3 24.5 120 32.4 29.4 110 Fisher Creek 9100 35.2 33.2 106 35.8 34.1 105 Northeast Entrance 7350 8.3 5.1 163 13.7 13.3 103 Parker Peak 9400 29.0 21.8 133 25.8 19.3 134 Sylvan Lake 8420 22.1 20.3 109 26.0 24.2 107 Thumb Divide 7980 16.6 14.2 117 18.2 20.2 90 Two Ocean Plateau 9240 34.7 29.0 120 28.2 29.2 97 White Mill 8700 28.3 23.8 119 23.7 25.4 93 Wolverine 7650 11.3 5.6 202 14.4 13.2 109 Younts Peak 8350 18.3 15.1 121 15.9 17.0 94 ----- ----- Basin Index (%) 123 104 WIND RIVER Burroughs Creek 8750 13.4 -M * 15.2 -M * Castle Creek 8400 3.8 -M * 8.1 -M * Cold Springs 9630 7.0 3.1 226 9.1 11.6 78 Deer Park 9700 15.1 16.3 93 16.0 22.7 70 Hobbs Park 10100 15.2 15.6 97 14.5 15.7 92 Kirwin 9550 12.9 10.1 128 12.2 13.0 94 Little Warm 9370 13.3 9.5 140 11.5 14.5 79 Owl Creek 8975 5.0 2.7 185 8.6 7.3 118 South Pass 9040 12.9 15.2 85 13.4 19.4 69 St. Lawrence Alt 8620 4.2 4.9 86 9.1 10.6 86 Togwotee Pass 9580 29.5 24.4 121 29.4 26.3 112 Townsend Creek 8700 11.2 8.8 127 12.4 14.1 88 ----- ----- Basin Index (%) 114 88 BIGHORN BASIN Bald Mtn. 9380 23.0 20.4 113 18.0 18.7 96 Bear Trap Meadow 8200 6.9 2.0 345 10.5 9.9 106 Bone Springs Div 9350 19.0 16.4 116 16.2 17.3 94 Grave Springs 8550 9.9 9.2 108 11.0 12.2 90 Kirwin 9550 12.9 10.1 128 12.2 13.0 94 Marquette 8760 9.2 -M * 10.8 -M * Middle Powder 7760 12.9 12.3 105 12.7 13.3 95 Owl Creek 8975 5.0 2.7 185 8.6 7.3 118 Powder River Pass 9480 12.3 10.2 121 14.3 14.2 101 Shell Creek 9580 16.3 15.8 103 15.5 15.3 101 Timber Creek 7950 4.3 3.7 116 8.4 9.0 93 ----- ----- Basin Index (%) 119 98 SHOSHONE RIVER Blackwater 9780 25.8 24.4 106 25.8 22.5 115 Evening Star 9200 29.3 24.5 120 32.4 29.4 110 Marquette 8760 9.2 -M * 10.8 -M * Sylvan Lake 8420 22.1 20.3 109 26.0 24.2 107 Sylvan Road 7120 6.8 8.3 82 18.0 17.9 101 Younts Peak 8350 18.3 15.1 121 15.9 17.0 94 ----- ----- Basin Index (%) 110 106 POWDER RIVER Bear Trap Meadow 8200 6.9 2.0 345 10.5 9.9 106 Cloud Peak Reservoir 9860 15.6 16.3 96 15.2 15.6 97 Grave Springs 8550 9.9 9.2 108 11.0 12.2 90 Hansen Sawmill 8360 6.9 4.3 160 10.2 10.1 101 Middle Powder 7760 12.9 12.3 105 12.7 13.3 95 Powder River Pass 9480 12.3 10.2 121 14.3 14.2 101 Soldier Park 8720 6.8 -M * 10.2 -M * ----- ----- Basin Index (%) 119 98 TONGUE RIVER Big Goose 7990 9.7 9.1 107 11.1 13.4 83 Bone Springs Div 9350 19.0 16.4 116 16.2 17.3 94 Burgess Junction 7880 12.6 12.4 102 13.7 13.9 99 Dome Lake 8880 13.9 11.8 118 11.4 15.4 74 Little Goose 8870 12.1 -M * -M -M * Sucker Creek 8880 14.4 12.7 113 14.9 16.4 91 Tie Creek 6870 7.0 3.5 200 14.1 13.6 104 ----- ----- Basin Index (%) 116 90 BELLE FOURCHE Blind Park 6890 2.5 3.6 69 9.3 13.6 68 Cole Canyon 5910 -M .8 * -M 10.9 * ----- ----- Basin Index (%) 69 68 CHEYENNE RIVER BASIN Blind Park 6890 2.5 3.6 69 9.3 13.6 68 North Rapid Creek 6130 4.2 3.5 120 9.3 11.6 80 ----- ----- Basin Index (%) 94 74 UPPER N. PLATTE Arapaho Ridge 10960 24.8 21.8 114 24.9 25.4 98 Blackhall Mtn 9820 33.5 -M * 32.6 -M * Columbine 9160 27.8 20.6 135 32.1 27.7 116 Divide Peak 8880 21.2 18.1 117 24.0 23.5 102 Joe Wright 10120 24.9 23.2 107 30.5 28.8 106 Laprele Creek 8375 10.5 7.3 144 14.2 14.3 99 Med Bow 10500 46.7 -M * 38.7 -M * Never Summer 10280 22.9 21.1 109 18.0 -M * North French Creek 10130 36.5 32.6 112 35.8 29.5 121 Old Battle 10000 35.0 34.1 103 33.0 37.9 87 Rawah 9020 11.0 8.0 138 16.6 16.6 100 Sage Creek Basin 7850 10.8 2.7 400 13.5 15.6 87 Sand Lake 10050 33.5 31.0 108 30.5 27.9 109 South Brush Creek 8440 10.7 10.0 107 14.5 17.0 85 Tower 10500 44.1 49.3 89 46.8 43.3 108 Webber Springs 9250 23.2 21.9 106 28.1 29.0 97 Whiskey Park 8950 33.8 25.6 132 34.3 30.4 113 Willow Creek Pass 9540 16.1 13.7 118 15.4 15.1 102 Zirkel 9340 -M 22.3 * -M 30.3 * ----- ----- Basin Index (%) 113 103 SWEETWATER Deer Park 9700 15.1 16.3 93 16.0 22.7 70 Larsen Creek 9000 4.0 9.8 41 10.7 -M * South Pass 9040 12.9 15.2 85 13.4 19.4 69 ----- ----- Basin Index (%) 77 70 LOWER N. PLATTE Casper Mtn. 7900 16.1 14.2 113 13.3 17.1 78 Laprele Creek 8375 10.5 7.3 144 14.2 14.3 99 Reno Hill 8400 18.5 13.8 134 19.5 17.9 109 Windy Peak 7900 8.8 6.1 144 10.2 12.3 83 ----- ----- Basin Index (%) 130 93 LARAMIE RIVER Brooklyn Lake 10240 30.6 22.8 134 30.4 23.7 128 Cinnabar Park 9574 24.6 20.0 123 29.0 26.1 111 Crow Creek 8330 6.7 .0 * 13.3 12.8 104 Deadman Hill 10220 22.0 18.1 122 19.6 19.8 99 Rawah 9020 11.0 8.0 138 16.6 16.6 100 Roach 9700 16.7 16.8 99 18.6 21.4 87 Windy Peak 7900 8.8 6.1 144 10.2 12.3 83 ----- ----- Basin Index (%) 131 104 S. PLATTE Black Mountain 8920 11.1 -M * 16.3 -M * Crow Creek 8330 6.7 .0 * 13.3 12.8 104 Deadman Hill 10220 22.0 18.1 122 19.6 19.8 99 ----- ----- Basin Index (%) 159* 101 LITTLE SNAKE RIVER Battle Mountain 7440 6.6 1.9 347 15.4 16.5 93 Divide Peak 8880 21.2 18.1 117 24.0 23.5 102 Elk River 8700 18.0 14.6 123 19.7 21.9 90 Little Snake River 8915 28.3 23.3 121 35.6 31.7 112 Old Battle 10000 35.0 34.1 103 33.0 37.9 87 Sage Creek Basin 7850 10.8 2.7 400 13.5 15.6 87 Sandstone RS 8150 13.0 8.6 151 17.5 20.1 87 Whiskey Park 8950 33.8 25.6 132 34.3 30.4 113 ----- ----- Basin Index (%) 129 98 UPPER GREEN RIVER Big Sandy Opening 9080 10.7 12.1 88 10.2 14.6 70 Blind Bull Sum 8650 29.5 24.3 121 17.6 20.7 85 East Rim Divide 7930 9.7 9.0 108 11.4 12.4 92 Elkhart Park G.S. 9400 11.0 11.8 93 11.5 14.4 80 Gros Ventre Summit 8750 14.0 12.5 112 14.8 14.0 106 Gunsight Pass 9820 14.9 13.5 110 15.5 15.4 101 Indian Creek 9425 24.5 23.7 103 18.1 24.2 75 Kendall R.S. 7740 9.7 6.6 147 13.4 15.0 89 Loomis Park 8240 15.2 11.9 128 20.8 18.3 114 New Fork Lake 8340 9.3 7.4 126 10.4 11.6 90 Pocket Creek 9360 -M -M * 9.6 -M * Snider Basin 8060 9.6 10.1 95 15.1 15.1 100 Spring Creek Divide 9000 28.8 23.7 122 27.0 25.4 106 Triple Peak 8500 29.5 19.0 155 29.5 27.0 109 ----- ----- Basin Index (%) 117 94 LOWER GREEN RIVER Blacks Fork Jct 8869 7.1 -M * 13.5 -M * Buck Pasture 9632 17.8 -M * 19.3 -M * EF Blacks Fork GS 9360 13.5 -M * 13.5 -M * Hams Fork 7840 7.4 5.0 148 12.6 12.5 101 Hewinta 9500 11.0 6.9 159 16.3 15.5 105 Hickerson Park 9122 8.5 5.0 170 12.5 11.5 109 Hole-in-Rock 9168 8.7 5.0 174 12.6 11.0 115 Indian Creek 9425 24.5 23.7 103 18.1 24.2 75 Kelley R.S. 8180 14.3 11.9 120 17.6 19.5 90 Spirit Lk 10235 17.6 -M * 19.4 -M * Steel Creek Park 10158 19.0 16.5 115 20.0 18.4 109 ----- ----- Basin Index (%) 126 97 UPPER BEAR RIVER Bear River RS 8777 5.5 -M * 12.7 -M * Bug Lake 7987 17.8 16.2 110 19.8 20.9 95 Burts Miller Ranch 8000 .0 -M * 7.8 -M * Chalk Creek #1 9171 21.1 24.6 86 21.0 27.5 76 Hayden Fork 9130 14.1 10.7 132 22.4 22.9 98 Kelley R.S. 8180 14.3 11.9 120 17.6 19.5 90 Lily Lake 9133 11.9 9.9 120 14.1 18.8 75 Monte Cristo 8932 29.3 27.4 107 27.9 28.2 99 Salt River Summit 7640 13.5 8.5 159 17.5 17.8 98 Spring Creek Divide 9000 28.8 23.7 122 27.0 25.4 106 ----- ----- Basin Index (%) 113 92 ----------------------------------------------------------------------------- -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.