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: APRIL 21 , 2020 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 15.9 11.7 136 20.1 21.8 92 Black Bear 8170 -M 36.9 * 33.8 40.0 84 Blind Bull Sum 8650 28.5 24.1 118 17.3 20.3 85 Cottonwood Creek 7670 25.7 18.3 140 31.0 26.0 119 East Rim Divide 7930 11.4 9.4 121 11.3 12.3 92 Grand Targhee 9260 45.7 42.2 108 29.7 32.8 91 Granite Creek 6770 18.8 10.5 179 18.1 20.4 89 Grassy Lake 7265 33.9 31.1 109 35.4 37.6 94 Gros Ventre Summit 8750 13.4 13.2 102 13.9 13.8 101 Gunsight Pass 9820 14.4 13.7 105 14.6 15.0 97 Lewis Lake Divide 7850 29.1 30.5 95 33.2 37.0 90 Phillips Bench 8200 -M 25.4 * -M 29.3 * Salt River Summit 7640 15.2 9.4 162 17.1 17.4 98 Snake River Station 6920 16.6 11.1 150 22.9 23.6 97 Spring Creek Divide 9000 28.0 23.5 119 26.5 24.9 106 Thumb Divide 7980 17.9 14.4 124 17.9 19.8 90 Togwotee Pass 9580 29.6 24.0 123 29.0 25.8 112 Two Ocean Plateau 9240 33.9 28.3 120 27.9 28.7 97 Willow Creek 8080 39.8 26.7 149 38.5 35.4 109 Younts Peak 8350 18.4 15.2 121 15.7 16.7 94 ----- ----- Basin Index (%) 122 97 MADISON-GALLATIN Black Bear 8170 -M 36.9 * 33.8 40.0 84 Canyon 7870 15.4 12.2 126 16.1 17.1 94 Madison Plateau 7750 23.0 22.9 100 20.6 27.6 75 West Yellowstone 6700 7.7 7.0 110 9.6 15.2 63 Whiskey Creek 6800 16.1 15.4 105 18.4 21.3 86 ----- ----- Basin Index (%) 108 81 YELLOWSTONE Beartooth Lake 9360 25.1 23.5 107 23.5 20.8 113 Burnt Mtn 5880 9.0 .0 * 16.7 14.4 116 Canyon 7870 15.4 12.2 126 16.1 17.1 94 Cole Creek 7850 20.6 16.4 126 15.9 14.7 108 Evening Star 9200 29.6 24.7 120 32.3 28.9 112 Fisher Creek 9100 34.7 32.6 106 35.5 33.5 106 Northeast Entrance 7350 9.8 6.4 153 13.4 13.0 103 Parker Peak 9400 28.8 21.1 136 25.7 18.8 137 Sylvan Lake 8420 23.0 20.4 113 25.7 23.7 108 Thumb Divide 7980 17.9 14.4 124 17.9 19.8 90 Two Ocean Plateau 9240 33.9 28.3 120 27.9 28.7 97 White Mill 8700 28.3 23.7 119 23.5 25.0 94 Wolverine 7650 12.8 6.9 186 14.3 12.9 111 Younts Peak 8350 18.4 15.2 121 15.7 16.7 94 ----- ----- Basin Index (%) 125 106 WIND RIVER Burroughs Creek 8750 14.5 -M * 15.0 -M * Castle Creek 8400 5.4 -M * 8.1 -M * Cold Springs 9630 8.2 4.3 191 9.0 11.0 82 Deer Park 9700 15.7 16.3 96 15.9 21.7 73 Hobbs Park 10100 15.5 14.9 104 14.5 14.9 97 Kirwin 9550 12.9 10.0 129 12.2 12.5 98 Little Warm 9370 13.1 10.0 131 11.2 14.0 80 Owl Creek 8975 6.9 3.7 186 8.5 6.9 123 South Pass 9040 13.5 15.4 88 13.5 18.7 72 St. Lawrence Alt 8620 5.4 5.2 104 9.1 10.0 91 Togwotee Pass 9580 29.6 24.0 123 29.0 25.8 112 Townsend Creek 8700 11.1 9.3 119 12.4 13.4 93 ----- ----- Basin Index (%) 117 91 BIGHORN BASIN Bald Mtn. 9380 22.4 19.9 113 18.1 18.3 99 Bear Trap Meadow 8200 8.4 2.9 290 10.4 9.5 109 Bone Springs Div 9350 19.0 16.1 118 16.2 16.9 96 Grave Springs 8550 10.1 9.5 106 10.9 11.8 92 Kirwin 9550 12.9 10.0 129 12.2 12.5 98 Marquette 8760 9.4 -M * 10.7 -M * Middle Powder 7760 13.3 12.4 107 12.6 12.9 98 Owl Creek 8975 6.9 3.7 186 8.5 6.9 123 Powder River Pass 9480 12.8 10.2 125 14.1 13.8 102 Shell Creek 9580 16.8 15.4 109 15.4 14.9 103 Timber Creek 7950 6.1 4.6 133 8.4 8.5 99 ----- ----- Basin Index (%) 123 101 SHOSHONE RIVER Blackwater 9780 25.4 23.8 107 25.5 21.9 116 Evening Star 9200 29.6 24.7 120 32.3 28.9 112 Marquette 8760 9.4 -M * 10.7 -M * Sylvan Lake 8420 23.0 20.4 113 25.7 23.7 108 Sylvan Road 7120 9.6 9.5 101 -M 17.7 * Younts Peak 8350 18.4 15.2 121 15.7 16.7 94 ----- ----- Basin Index (%) 113 109 POWDER RIVER Bear Trap Meadow 8200 8.4 2.9 290 10.4 9.5 109 Cloud Peak Reservoir 9860 16.1 15.9 101 15.2 15.0 101 Grave Springs 8550 10.1 9.5 106 10.9 11.8 92 Hansen Sawmill 8360 8.1 4.6 176 10.2 9.7 105 Middle Powder 7760 13.3 12.4 107 12.6 12.9 98 Powder River Pass 9480 12.8 10.2 125 14.1 13.8 102 Soldier Park 8720 7.7 -M * 10.2 -M * ----- ----- Basin Index (%) 124 101 TONGUE RIVER Big Goose 7990 10.0 9.2 109 11.1 12.8 87 Bone Springs Div 9350 19.0 16.1 118 16.2 16.9 96 Burgess Junction 7880 12.8 12.6 102 13.7 13.6 101 Dome Lake 8880 15.0 11.8 127 11.4 15.0 76 Little Goose 8870 12.6 -M * 9.5 -M * Sucker Creek 8880 14.9 12.7 117 14.7 15.9 92 Tie Creek 6870 8.0 4.2 190 14.0 13.0 108 ----- ----- Basin Index (%) 120 93 BELLE FOURCHE Blind Park 6890 4.5 4.0 112 9.3 13.2 70 Cole Canyon 5910 -M 1.8 * -M 10.5 * ----- ----- Basin Index (%) 112 70 CHEYENNE RIVER BASIN Blind Park 6890 4.5 4.0 112 9.3 13.2 70 North Rapid Creek 6130 5.9 4.0 148 9.3 11.2 83 ----- ----- Basin Index (%) 130 76 UPPER N. PLATTE Arapaho Ridge 10960 24.0 21.3 113 24.0 24.4 98 Blackhall Mtn 9820 33.1 -M * 31.8 -M * Columbine 9160 29.3 20.6 142 30.8 27.0 114 Divide Peak 8880 22.4 18.6 120 23.3 22.9 102 Joe Wright 10120 23.9 22.4 107 29.5 27.9 106 Laprele Creek 8375 11.8 7.8 151 13.9 13.8 101 Med Bow 10500 45.1 -M * 38.3 -M * Never Summer 10280 21.8 20.7 105 16.8 -M * North French Creek 10130 35.6 32.0 111 34.6 28.7 121 Old Battle 10000 34.3 32.9 104 32.5 37.2 87 Rawah 9020 11.2 8.3 135 16.1 15.6 103 Sage Creek Basin 7850 13.0 5.4 241 13.3 15.3 87 Sand Lake 10050 32.2 30.6 105 29.4 27.0 109 South Brush Creek 8440 11.8 9.7 122 14.3 16.5 87 Tower 10500 47.8 48.2 99 45.5 42.3 108 Webber Springs 9250 23.4 21.8 107 27.6 28.5 97 Whiskey Park 8950 34.5 25.8 134 33.7 29.7 113 Willow Creek Pass 9540 15.5 13.3 117 14.6 14.5 101 Zirkel 9340 -M 22.6 * -M 29.8 * ----- ----- Basin Index (%) 116 103 SWEETWATER Deer Park 9700 15.7 16.3 96 15.9 21.7 73 Larsen Creek 9000 6.1 10.2 60 10.5 -M * South Pass 9040 13.5 15.4 88 13.5 18.7 72 ----- ----- Basin Index (%) 84 73 LOWER N. PLATTE Casper Mtn. 7900 16.6 14.4 115 12.5 16.7 75 Laprele Creek 8375 11.8 7.8 151 13.9 13.8 101 Reno Hill 8400 18.2 14.0 130 18.7 17.3 108 Windy Peak 7900 10.1 6.5 155 9.9 11.7 85 ----- ----- Basin Index (%) 133 92 LARAMIE RIVER Brooklyn Lake 10240 30.5 22.3 137 29.6 22.9 129 Cinnabar Park 9574 24.8 20.0 124 28.5 25.4 112 Crow Creek 8330 7.8 .3 2600* 12.8 12.0 107 Deadman Hill 10220 21.6 17.2 126 19.2 19.0 101 Rawah 9020 11.2 8.3 135 16.1 15.6 103 Roach 9700 17.0 16.6 102 18.4 20.7 89 Windy Peak 7900 10.1 6.5 155 9.9 11.7 85 ----- ----- Basin Index (%) 135 106 S. PLATTE Black Mountain 8920 12.2 -M * 15.8 -M * Crow Creek 8330 7.8 .3 2600* 12.8 12.0 107 Deadman Hill 10220 21.6 17.2 126 19.2 19.0 101 ----- ----- Basin Index (%) 168* 103 LITTLE SNAKE RIVER Battle Mountain 7440 8.9 3.9 228 15.2 16.1 94 Divide Peak 8880 22.4 18.6 120 23.3 22.9 102 Elk River 8700 20.6 15.2 136 19.5 21.4 91 Little Snake River 8915 28.9 24.1 120 34.7 31.2 111 Old Battle 10000 34.3 32.9 104 32.5 37.2 87 Sage Creek Basin 7850 13.0 5.4 241 13.3 15.3 87 Sandstone RS 8150 15.4 10.0 154 17.5 19.6 89 Whiskey Park 8950 34.5 25.8 134 33.7 29.7 113 ----- ----- Basin Index (%) 131 98 UPPER GREEN RIVER Big Sandy Opening 9080 11.2 12.6 89 10.0 14.2 70 Blind Bull Sum 8650 28.5 24.1 118 17.3 20.3 85 East Rim Divide 7930 11.4 9.4 121 11.3 12.3 92 Elkhart Park G.S. 9400 10.9 11.9 92 11.1 14.1 79 Gros Ventre Summit 8750 13.4 13.2 102 13.9 13.8 101 Gunsight Pass 9820 14.4 13.7 105 14.6 15.0 97 Indian Creek 9425 24.7 23.4 106 17.8 23.7 75 Kendall R.S. 7740 10.5 8.1 130 12.8 14.8 86 Loomis Park 8240 15.5 12.8 121 20.1 18.0 112 New Fork Lake 8340 10.1 8.6 117 10.0 11.3 88 Pocket Creek 9360 -M -M * 9.3 -M * Snider Basin 8060 11.5 10.6 108 14.9 14.8 101 Spring Creek Divide 9000 28.0 23.5 119 26.5 24.9 106 Triple Peak 8500 29.8 19.2 155 28.5 26.5 108 ----- ----- Basin Index (%) 115 93 LOWER GREEN RIVER Blacks Fork Jct 8869 8.2 -M * 13.3 -M * Buck Pasture 9632 18.8 -M * 19.1 -M * EF Blacks Fork GS 9360 14.8 -M * 13.4 -M * Hams Fork 7840 10.2 6.4 159 12.3 12.1 102 Hewinta 9500 13.8 7.9 175 16.2 15.0 108 Hickerson Park 9122 10.2 5.3 192 12.4 11.1 112 Hole-in-Rock 9168 10.3 5.7 181 12.4 10.6 117 Indian Creek 9425 24.7 23.4 106 17.8 23.7 75 Kelley R.S. 8180 16.0 12.4 129 17.3 19.0 91 Spirit Lk 10235 17.9 -M * 19.3 -M * Steel Creek Park 10158 19.0 16.2 117 19.9 17.8 112 ----- ----- Basin Index (%) 135 99 UPPER BEAR RIVER Bear River RS 8777 7.9 -M * 12.6 -M * Bug Lake 7987 19.2 16.9 114 19.5 20.5 95 Burts Miller Ranch 8000 .7 -M * 7.8 -M * Chalk Creek #1 9171 21.8 24.5 89 20.7 26.9 77 Hayden Fork 9130 16.7 11.4 146 22.2 22.5 99 Kelley R.S. 8180 16.0 12.4 129 17.3 19.0 91 Lily Lake 9133 12.8 10.4 123 14.0 18.4 76 Monte Cristo 8932 30.0 27.4 109 27.5 27.5 100 Salt River Summit 7640 15.2 9.4 162 17.1 17.4 98 Spring Creek Divide 9000 28.0 23.5 119 26.5 24.9 106 ----- ----- Basin Index (%) 118 93 ----------------------------------------------------------------------------- -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.