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 FRIDAY: MAY 8 , 2020 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 8.7 5.5 158 21.2 23.5 90 Black Bear 8170 -M 36.9 * 35.1 42.8 82 Blind Bull Sum 8650 29.7 22.6 131 18.3 22.0 83 Cottonwood Creek 7670 19.3 13.3 145 33.2 28.6 116 East Rim Divide 7930 .0 6.6 0 11.9 13.4 89 Grand Targhee 9260 40.6 46.4 88 34.4 35.9 96 Granite Creek 6770 10.6 6.3 168 19.6 21.9 89 Grassy Lake 7265 24.1 26.7 90 36.7 40.3 91 Gros Ventre Summit 8750 11.3 10.0 113 15.3 15.2 101 Gunsight Pass 9820 13.4 11.8 114 16.1 16.7 96 Lewis Lake Divide 7850 20.8 29.5 71 34.2 39.5 87 Phillips Bench 8200 -M 23.4 * -M 31.6 * Salt River Summit 7640 4.2 5.7 74 17.8 18.9 94 Snake River Station 6920 7.0 3.5 200 23.3 25.4 92 Spring Creek Divide 9000 25.6 24.0 107 27.5 26.9 102 Thumb Divide 7980 9.0 9.4 96 18.7 21.6 87 Togwotee Pass 9580 28.5 25.2 113 30.5 28.3 108 Two Ocean Plateau 9240 32.6 29.7 110 29.0 30.9 94 Willow Creek 8080 28.4 21.5 132 41.2 38.9 106 Younts Peak 8350 6.9 15.6 44 16.9 18.3 92 ----- ----- Basin Index (%) 102 94 MADISON-GALLATIN Black Bear 8170 -M 36.9 * 35.1 42.8 82 Canyon 7870 10.2 8.0 128 17.3 18.6 93 Madison Plateau 7750 17.4 20.6 84 22.0 29.8 74 West Yellowstone 6700 .0 .0 * 10.5 16.5 64 Whiskey Creek 6800 10.4 11.5 90 19.6 22.9 86 ----- ----- Basin Index (%) 95 80 YELLOWSTONE Beartooth Lake 9360 25.2 23.0 110 24.7 22.8 108 Burnt Mtn 5880 .0 .0 * 16.2 16.9 96 Canyon 7870 10.2 8.0 128 17.3 18.6 93 Cole Creek 7850 17.6 17.0 104 16.3 17.5 93 Evening Star 9200 25.7 25.2 102 33.8 31.5 107 Fisher Creek 9100 34.4 33.8 102 37.8 36.3 104 Northeast Entrance 7350 .1 1.0 10 14.9 14.4 103 Parker Peak 9400 -M 21.7 * -M 20.9 * Sylvan Lake 8420 17.0 18.2 93 27.2 26.0 105 Thumb Divide 7980 9.0 9.4 96 18.7 21.6 87 Two Ocean Plateau 9240 32.6 29.7 110 29.0 30.9 94 White Mill 8700 29.2 24.5 119 25.0 27.2 92 Wolverine 7650 .4 .4 100* 14.8 14.3 103 Younts Peak 8350 6.9 15.6 44 16.9 18.3 92 ----- ----- Basin Index (%) 101 99 WIND RIVER Burroughs Creek 8750 5.7 -M * 15.2 -M * Castle Creek 8400 .0 -M * 8.3 -M * Cold Springs 9630 .0 1.6 0 9.2 13.2 70 Deer Park 9700 9.5 14.6 65 16.2 24.3 67 Hobbs Park 10100 11.3 15.9 71 14.5 17.6 82 Kirwin 9550 8.7 10.8 81 12.4 14.6 85 Little Warm 9370 9.1 6.9 132 11.8 16.1 73 Owl Creek 8975 .1 .5 20* 8.7 8.4 104 South Pass 9040 7.2 12.6 57 13.5 21.1 64 St. Lawrence Alt 8620 .0 1.4 0 9.3 12.2 76 Togwotee Pass 9580 28.5 25.2 113 30.5 28.3 108 Townsend Creek 8700 5.1 4.8 106 13.2 15.6 85 ----- ----- Basin Index (%) 84 81 BIGHORN BASIN Bald Mtn. 9380 21.9 20.4 107 17.8 20.7 86 Bear Trap Meadow 8200 .0 .2 0* 10.9 11.4 96 Bone Springs Div 9350 18.2 16.4 111 16.6 19.3 86 Grave Springs 8550 6.1 8.2 74 11.3 13.7 82 Kirwin 9550 8.7 10.8 81 12.4 14.6 85 Marquette 8760 4.3 -M * 11.0 -M * Middle Powder 7760 9.2 11.1 83 13.3 15.0 89 Owl Creek 8975 .1 .5 20* 8.7 8.4 104 Powder River Pass 9480 9.6 9.0 107 15.5 16.0 97 Shell Creek 9580 15.8 16.6 95 15.7 17.3 91 Timber Creek 7950 .3 1.8 17 8.4 10.7 79 ----- ----- Basin Index (%) 95 89 SHOSHONE RIVER Blackwater 9780 21.8 25.2 87 26.7 24.3 110 Evening Star 9200 25.7 25.2 102 33.8 31.5 107 Marquette 8760 4.3 -M * 11.0 -M * Sylvan Lake 8420 17.0 18.2 93 27.2 26.0 105 Sylvan Road 7120 .1 2.4 4 18.6 19.2 97 Younts Peak 8350 6.9 15.6 44 16.9 18.3 92 ----- ----- Basin Index (%) 83 103 POWDER RIVER Bear Trap Meadow 8200 .0 .2 0* 10.9 11.4 96 Cloud Peak Reservoir 9860 13.5 16.6 81 15.8 17.8 89 Grave Springs 8550 6.1 8.2 74 11.3 13.7 82 Hansen Sawmill 8360 1.3 1.5 87 11.1 11.6 96 Middle Powder 7760 9.2 11.1 83 13.3 15.0 89 Powder River Pass 9480 9.6 9.0 107 15.5 16.0 97 Soldier Park 8720 .5 -M * 10.9 -M * ----- ----- Basin Index (%) 85 91 TONGUE RIVER Big Goose 7990 6.0 10.3 58 11.6 15.4 75 Bone Springs Div 9350 18.2 16.4 111 16.6 19.3 86 Burgess Junction 7880 10.7 11.4 94 13.9 15.7 89 Dome Lake 8880 11.1 11.2 99 12.4 17.5 71 Little Goose 8870 8.7 -M * -M -M * Sucker Creek 8880 10.4 12.3 85 15.4 18.6 83 Tie Creek 6870 .3 1.8 17 14.5 15.5 94 ----- ----- Basin Index (%) 89 83 BELLE FOURCHE Blind Park 6890 .0 .0 * 10.4 15.1 69 Cole Canyon 5910 -M .0 * -M 13.2 * ----- ----- Basin Index (%) * 69 CHEYENNE RIVER BASIN Blind Park 6890 .0 .0 * 10.4 15.1 69 North Rapid Creek 6130 .0 .0 * -M 13.0 * ----- ----- Basin Index (%) * 69 UPPER N. PLATTE Arapaho Ridge 10960 21.7 22.3 97 25.5 27.0 94 Blackhall Mtn 9820 28.3 -M * 34.0 -M * Columbine 9160 16.9 14.4 117 33.0 29.3 113 Divide Peak 8880 11.3 15.6 72 25.2 25.2 100 Joe Wright 10120 22.1 22.9 97 31.4 30.9 102 Laprele Creek 8375 3.8 4.0 95 14.7 15.8 93 Med Bow 10500 42.4 -M * 41.4 -M * Never Summer 10280 21.6 22.1 98 18.8 -M * North French Creek 10130 34.3 32.8 105 37.4 31.9 117 Old Battle 10000 34.4 36.2 95 35.5 40.4 88 Rawah 9020 5.3 3.4 156 17.7 17.9 99 Sage Creek Basin 7850 -M .0 * 14.6 16.7 87 Sand Lake 10050 33.0 31.8 104 32.6 30.1 108 South Brush Creek 8440 2.0 6.2 32 16.3 18.7 87 Tower 10500 48.5 51.4 94 48.7 46.1 106 Webber Springs 9250 18.4 20.2 91 30.1 30.8 98 Whiskey Park 8950 24.6 27.0 91 35.7 32.6 110 Willow Creek Pass 9540 13.1 14.0 94 15.9 16.3 98 Zirkel 9340 16.6 20.1 83 -M 32.0 * ----- ----- Basin Index (%) 95 101 SWEETWATER Deer Park 9700 9.5 14.6 65 16.2 24.3 67 Larsen Creek 9000 .0 7.1 0 11.0 -M * South Pass 9040 7.2 12.6 57 13.5 21.1 64 ----- ----- Basin Index (%) 49 65 LOWER N. PLATTE Casper Mtn. 7900 10.1 11.9 85 14.0 19.0 74 Laprele Creek 8375 3.8 4.0 95 14.7 15.8 93 Reno Hill 8400 14.2 11.4 125 20.3 19.9 102 Windy Peak 7900 .4 1.6 25 11.2 13.6 82 ----- ----- Basin Index (%) 99 88 LARAMIE RIVER Brooklyn Lake 10240 25.8 21.9 118 31.7 25.7 123 Cinnabar Park 9574 18.8 18.0 104 30.0 28.0 107 Crow Creek 8330 .1 .0 * 14.6 14.1 104 Deadman Hill 10220 18.1 18.7 97 20.5 21.5 95 Rawah 9020 5.3 3.4 156 17.7 17.9 99 Roach 9700 10.4 16.4 63 19.5 23.1 84 Windy Peak 7900 .4 1.6 25 11.2 13.6 82 ----- ----- Basin Index (%) 99 101 S. PLATTE Black Mountain 8920 4.2 -M * 17.0 -M * Crow Creek 8330 .1 .0 * 14.6 14.1 104 Deadman Hill 10220 18.1 18.7 97 20.5 21.5 95 ----- ----- Basin Index (%) 97* 99 LITTLE SNAKE RIVER Battle Mountain 7440 .0 .0 * 17.0 17.7 96 Divide Peak 8880 11.3 15.6 72 25.2 25.2 100 Elk River 8700 8.5 9.3 91 20.4 23.5 87 Little Snake River 8915 20.4 20.9 98 37.1 34.0 109 Old Battle 10000 34.4 36.2 95 35.5 40.4 88 Sage Creek Basin 7850 -M .0 * 14.6 16.7 87 Sandstone RS 8150 3.5 2.7 130 18.9 21.5 88 Whiskey Park 8950 24.6 27.0 91 35.7 32.6 110 ----- ----- Basin Index (%) 92 97 UPPER GREEN RIVER Big Sandy Opening 9080 4.0 8.7 46 10.5 15.9 66 Blind Bull Sum 8650 29.7 22.6 131 18.3 22.0 83 East Rim Divide 7930 .0 6.6 0 11.9 13.4 89 Elkhart Park G.S. 9400 6.7 9.8 68 12.0 15.7 76 Gros Ventre Summit 8750 11.3 10.0 113 15.3 15.2 101 Gunsight Pass 9820 13.4 11.8 114 16.1 16.7 96 Indian Creek 9425 17.3 21.1 82 18.2 25.8 71 Kendall R.S. 7740 1.7 .2 850* 13.7 16.0 86 Loomis Park 8240 8.9 8.0 111 21.6 19.6 110 New Fork Lake 8340 1.9 3.5 54 10.9 12.7 86 Pocket Creek 9360 -M -M * 9.8 -M * Snider Basin 8060 .0 7.6 0 15.4 16.1 96 Spring Creek Divide 9000 25.6 24.0 107 27.5 26.9 102 Triple Peak 8500 18.8 15.3 123 30.4 28.9 105 ----- ----- Basin Index (%) 93 91 LOWER GREEN RIVER Blacks Fork Jct 8869 .0 -M * 14.0 -M * Buck Pasture 9632 10.8 -M * 20.4 -M * EF Blacks Fork GS 9360 4.8 -M * 14.7 -M * Hams Fork 7840 .0 .3 0* 13.4 13.6 99 Hewinta 9500 2.5 2.9 86 16.7 16.9 99 Hickerson Park 9122 .0 1.2 0 13.2 12.6 105 Hole-in-Rock 9168 .0 .7 0* 13.2 12.1 109 Indian Creek 9425 17.3 21.1 82 18.2 25.8 71 Kelley R.S. 8180 5.9 8.9 66 17.9 20.8 86 Spirit Lk 10235 12.0 -M * 19.8 -M * Steel Creek Park 10158 16.5 17.7 93 20.9 19.9 105 ----- ----- Basin Index (%) 80* 93 UPPER BEAR RIVER Bear River RS 8777 .0 -M * 12.9 -M * Bug Lake 7987 9.2 12.6 73 19.8 22.4 88 Burts Miller Ranch 8000 .0 -M * 7.8 -M * Chalk Creek #1 9171 12.4 22.2 56 21.2 29.4 72 Hayden Fork 9130 3.1 6.6 47 23.2 24.6 94 Kelley R.S. 8180 5.9 8.9 66 17.9 20.8 86 Lily Lake 9133 3.5 7.0 50 14.8 20.3 73 Monte Cristo 8932 19.1 22.7 84 28.0 30.3 92 Salt River Summit 7640 4.2 5.7 74 17.8 18.9 94 Spring Creek Divide 9000 25.6 24.0 107 27.5 26.9 102 ----- ----- Basin Index (%) 76 88 ----------------------------------------------------------------------------- -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.