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 MONDAY: APRIL 13 , 2020 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 17.1 14.0 122 19.4 21.2 92 Black Bear 8170 32.2 36.6 88 33.6 38.7 87 Blind Bull Sum 8650 27.1 23.7 114 16.4 19.7 83 Cottonwood Creek 7670 25.2 20.3 124 30.0 25.0 120 East Rim Divide 7930 11.0 10.1 109 10.2 11.9 86 Grand Targhee 9260 45.1 40.4 112 29.3 31.4 93 Granite Creek 6770 18.0 13.0 138 17.3 19.8 87 Grassy Lake 7265 34.3 31.4 109 35.1 36.4 96 Gros Ventre Summit 8750 13.2 12.9 102 13.1 13.2 99 Gunsight Pass 9820 13.9 13.6 102 13.9 14.1 99 Lewis Lake Divide 7850 -M 30.2 * -M 35.8 * Phillips Bench 8200 -M 26.0 * -M 28.4 * Salt River Summit 7640 -M 11.8 * -M 16.9 * Snake River Station 6920 19.3 13.6 142 22.7 22.7 100 Spring Creek Divide 9000 27.2 23.0 118 25.4 24.1 105 Thumb Divide 7980 17.8 14.6 122 17.8 18.9 94 Togwotee Pass 9580 28.7 22.8 126 28.1 24.7 114 Two Ocean Plateau 9240 33.2 26.9 123 27.2 27.6 99 Willow Creek 8080 38.7 27.2 142 37.1 34.2 108 Younts Peak 8350 18.2 14.6 125 14.8 16.0 92 ----- ----- Basin Index (%) 117 98 MADISON-GALLATIN Black Bear 8170 32.2 36.6 88 33.6 38.7 87 Canyon 7870 15.6 12.3 127 15.8 16.5 96 Madison Plateau 7750 23.2 22.3 104 20.5 26.6 77 West Yellowstone 6700 -M 8.5 * -M 14.3 * Whiskey Creek 6800 16.3 14.6 112 18.2 20.5 89 ----- ----- Basin Index (%) 102 86 YELLOWSTONE Beartooth Lake 9360 24.5 22.0 111 22.7 20.1 113 Burnt Mtn 5880 8.9 1.7 524 14.9 13.3 112 Canyon 7870 15.6 12.3 127 15.8 16.5 96 Cole Creek 7850 18.7 15.4 121 14.4 13.7 105 Evening Star 9200 29.0 24.4 119 31.4 27.8 113 Fisher Creek 9100 34.0 31.7 107 34.5 32.2 107 Northeast Entrance 7350 10.8 8.4 129 13.1 12.5 105 Parker Peak 9400 -M 20.2 * -M 18.0 * Sylvan Lake 8420 23.2 19.8 117 24.9 22.7 110 Thumb Divide 7980 17.8 14.6 122 17.8 18.9 94 Two Ocean Plateau 9240 33.2 26.9 123 27.2 27.6 99 White Mill 8700 27.7 23.3 119 22.9 24.1 95 Wolverine 7650 12.7 9.1 140 13.6 12.4 110 Younts Peak 8350 18.2 14.6 125 14.8 16.0 92 ----- ----- Basin Index (%) 122 104 WIND RIVER Burroughs Creek 8750 14.0 -M * 14.5 -M * Castle Creek 8400 5.8 -M * 7.7 -M * Cold Springs 9630 7.2 6.0 120 7.5 10.3 73 Deer Park 9700 14.8 16.2 91 14.1 20.5 69 Hobbs Park 10100 14.3 14.9 96 12.5 14.1 89 Kirwin 9550 11.9 9.9 120 11.3 11.9 95 Little Warm 9370 12.7 10.3 123 10.1 13.2 77 Owl Creek 8975 6.5 5.4 120 7.8 6.3 124 South Pass 9040 12.5 15.8 79 11.8 17.9 66 St. Lawrence Alt 8620 4.7 6.7 70 8.0 9.3 86 Togwotee Pass 9580 28.7 22.8 126 28.1 24.7 114 Townsend Creek 8700 9.8 10.0 98 10.3 12.7 81 ----- ----- Basin Index (%) 104 86 BIGHORN BASIN Bald Mtn. 9380 21.0 19.3 109 15.3 17.5 87 Bear Trap Meadow 8200 7.9 4.6 172 9.4 8.9 106 Bone Springs Div 9350 18.5 17.0 109 14.8 16.0 92 Grave Springs 8550 9.9 9.6 103 10.6 11.0 96 Kirwin 9550 11.9 9.9 120 11.3 11.9 95 Marquette 8760 7.7 -M * 9.3 -M * Middle Powder 7760 12.8 12.4 103 12.3 12.2 101 Owl Creek 8975 6.5 5.4 120 7.8 6.3 124 Powder River Pass 9480 12.6 10.3 122 12.8 13.0 98 Shell Creek 9580 15.5 15.6 99 14.4 14.2 101 Timber Creek 7950 6.1 5.2 117 7.7 7.7 100 ----- ----- Basin Index (%) 112 98 SHOSHONE RIVER Blackwater 9780 24.4 23.5 104 24.4 21.0 116 Evening Star 9200 29.0 24.4 119 31.4 27.8 113 Marquette 8760 7.7 -M * 9.3 -M * Sylvan Lake 8420 23.2 19.8 117 24.9 22.7 110 Sylvan Road 7120 11.6 10.4 112 -M 16.9 * Younts Peak 8350 18.2 14.6 125 14.8 16.0 92 ----- ----- Basin Index (%) 115 109 POWDER RIVER Bear Trap Meadow 8200 7.9 4.6 172 9.4 8.9 106 Cloud Peak Reservoir 9860 15.1 15.3 99 13.8 14.0 99 Grave Springs 8550 9.9 9.6 103 10.6 11.0 96 Hansen Sawmill 8360 7.6 6.1 125 9.4 9.0 104 Middle Powder 7760 12.8 12.4 103 12.3 12.2 101 Powder River Pass 9480 12.6 10.3 122 12.8 13.0 98 Soldier Park 8720 7.3 -M * 9.5 -M * ----- ----- Basin Index (%) 113 100 TONGUE RIVER Big Goose 7990 9.2 9.9 93 10.5 12.0 88 Bone Springs Div 9350 18.5 17.0 109 14.8 16.0 92 Burgess Junction 7880 11.4 12.2 93 12.6 12.9 98 Dome Lake 8880 13.9 12.0 116 10.4 14.2 73 Little Goose 8870 11.6 -M * 8.9 -M * Sucker Creek 8880 13.6 12.6 108 13.0 15.0 87 Tie Creek 6870 7.7 5.1 151 13.1 12.1 108 ----- ----- Basin Index (%) 108 91 BELLE FOURCHE Blind Park 6890 3.8 5.8 66 8.4 12.4 68 Cole Canyon 5910 -M 3.8 * -M 9.9 * ----- ----- Basin Index (%) 66 68 CHEYENNE RIVER BASIN Blind Park 6890 3.8 5.8 66 8.4 12.4 68 North Rapid Creek 6130 5.7 5.9 97 8.8 10.3 85 ----- ----- Basin Index (%) 81 76 UPPER N. PLATTE Arapaho Ridge 10960 22.7 21.5 106 22.5 23.6 95 Blackhall Mtn 9820 30.6 -M * 29.6 -M * Columbine 9160 26.9 22.6 119 28.7 26.2 110 Divide Peak 8880 20.0 20.3 99 21.8 22.0 99 Joe Wright 10120 21.3 22.0 97 27.4 26.7 103 Laprele Creek 8375 11.7 9.3 126 13.1 13.0 101 Med Bow 10500 43.2 -M * 35.8 -M * Never Summer 10280 20.8 20.5 101 15.8 -M * North French Creek 10130 33.3 31.2 107 32.4 27.5 118 Old Battle 10000 32.3 32.1 101 30.3 35.8 85 Rawah 9020 9.8 10.0 98 14.6 15.0 97 Sage Creek Basin 7850 11.7 9.9 118 12.4 15.0 83 Sand Lake 10050 30.1 30.1 100 27.4 25.6 107 South Brush Creek 8440 10.1 11.3 89 13.2 15.8 84 Tower 10500 47.0 47.2 100 43.1 40.8 106 Webber Springs 9250 21.8 23.4 93 25.4 27.4 93 Whiskey Park 8950 32.0 27.5 116 31.8 28.5 112 Willow Creek Pass 9540 14.1 12.6 112 13.2 13.9 95 Zirkel 9340 25.5 24.7 103 31.4 29.1 108 ----- ----- Basin Index (%) 104 101 SWEETWATER Deer Park 9700 14.8 16.2 91 14.1 20.5 69 Larsen Creek 9000 6.4 11.0 58 9.6 -M * South Pass 9040 12.5 15.8 79 11.8 17.9 66 ----- ----- Basin Index (%) 78 67 LOWER N. PLATTE Casper Mtn. 7900 16.1 14.5 111 12.0 15.7 76 Laprele Creek 8375 11.7 9.3 126 13.1 13.0 101 Reno Hill 8400 17.1 14.2 120 -M 16.2 * Windy Peak 7900 8.8 7.5 117 8.9 11.0 81 ----- ----- Basin Index (%) 118 86 LARAMIE RIVER Brooklyn Lake 10240 27.6 22.3 124 26.6 21.8 122 Cinnabar Park 9574 22.7 21.3 107 25.6 24.8 103 Crow Creek 8330 6.2 5.5 113 10.9 11.4 96 Deadman Hill 10220 19.2 16.6 116 17.1 18.0 95 Rawah 9020 9.8 10.0 98 14.6 15.0 97 Roach 9700 14.4 16.5 87 16.0 19.9 80 Windy Peak 7900 8.8 7.5 117 8.9 11.0 81 ----- ----- Basin Index (%) 109 98 S. PLATTE Black Mountain 8920 9.6 -M * 13.5 -M * Crow Creek 8330 6.2 5.5 113 10.9 11.4 96 Deadman Hill 10220 19.2 16.6 116 17.1 18.0 95 ----- ----- Basin Index (%) 115 95 LITTLE SNAKE RIVER Battle Mountain 7440 8.4 7.7 109 14.2 15.4 92 Divide Peak 8880 20.0 20.3 99 21.8 22.0 99 Elk River 8700 18.0 17.8 101 18.2 20.6 88 Little Snake River 8915 26.5 26.0 102 32.5 30.7 106 Old Battle 10000 32.3 32.1 101 30.3 35.8 85 Sage Creek Basin 7850 11.7 9.9 118 12.4 15.0 83 Sandstone RS 8150 14.3 12.4 115 16.0 18.8 85 Whiskey Park 8950 32.0 27.5 116 31.8 28.5 112 ----- ----- Basin Index (%) 106 95 UPPER GREEN RIVER Big Sandy Opening 9080 10.5 12.9 81 9.4 13.6 69 Blind Bull Sum 8650 27.1 23.7 114 16.4 19.7 83 East Rim Divide 7930 11.0 10.1 109 10.2 11.9 86 Elkhart Park G.S. 9400 10.5 12.2 86 10.7 13.6 79 Gros Ventre Summit 8750 13.2 12.9 102 13.1 13.2 99 Gunsight Pass 9820 13.9 13.6 102 13.9 14.1 99 Indian Creek 9425 23.6 24.3 97 16.8 22.9 73 Kendall R.S. 7740 10.3 10.4 99 11.6 14.3 81 Loomis Park 8240 14.9 13.7 109 18.9 17.5 108 New Fork Lake 8340 10.3 9.8 105 9.4 10.9 86 Pocket Creek 9360 -M -M * 8.7 -M * Snider Basin 8060 11.9 12.0 99 14.1 14.4 98 Spring Creek Divide 9000 27.2 23.0 118 25.4 24.1 105 Triple Peak 8500 27.9 20.3 137 26.9 25.6 105 ----- ----- Basin Index (%) 107 91 LOWER GREEN RIVER Blacks Fork Jct 8869 -M -M * -M -M * Buck Pasture 9632 -M -M * -M -M * EF Blacks Fork GS 9360 13.5 -M * 12.1 -M * Hams Fork 7840 10.5 9.2 114 11.7 11.6 101 Hewinta 9500 10.9 10.3 106 14.8 14.5 102 Hickerson Park 9122 10.1 7.2 140 12.0 10.6 113 Hole-in-Rock 9168 -M 7.1 * -M 10.1 * Indian Creek 9425 23.6 24.3 97 16.8 22.9 73 Kelley R.S. 8180 15.1 14.0 108 16.5 18.3 90 Spirit Lk 10235 -M -M * -M -M * Steel Creek Park 10158 17.7 16.1 110 18.3 17.1 107 ----- ----- Basin Index (%) 108 95 UPPER BEAR RIVER Bear River RS 8777 8.2 -M * 11.9 -M * Bug Lake 7987 18.5 19.2 96 18.8 19.8 95 Burts Miller Ranch 8000 2.5 -M * 7.2 -M * Chalk Creek #1 9171 -M 24.8 * -M 25.9 * Hayden Fork 9130 14.5 14.4 101 21.0 21.6 97 Kelley R.S. 8180 15.1 14.0 108 16.5 18.3 90 Lily Lake 9133 12.0 12.7 94 13.3 17.7 75 Monte Cristo 8932 28.8 27.8 104 26.6 26.5 100 Salt River Summit 7640 -M 11.8 * -M 16.9 * Spring Creek Divide 9000 27.2 23.0 118 25.4 24.1 105 ----- ----- Basin Index (%) 105 95 ----------------------------------------------------------------------------- -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.