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 21 , 2021 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 .0 .0 * 19.4 24.6 79 Blind Bull Sum 8650 16.9 19.4 87 15.1 23.3 65 Cottonwood Creek 7670 .0 5.4 0 26.0 30.0 87 East Rim Divide 7930 .1 .0 * 11.2 14.2 79 Grand Targhee 9260 29.5 41.8 71 32.1 36.8 87 Granite Creek 6770 2.8 .0 * -M 23.0 * Grassy Lake 7265 4.8 16.4 29 33.4 41.9 80 Gros Ventre Summit 8750 1.3 4.9 27 12.2 16.2 75 Gunsight Pass 9820 5.5 9.9 56 13.9 17.7 79 Lewis Lake Divide 7850 4.1 21.7 19 31.9 41.1 78 Loomis Park 8240 .0 1.9 0 16.4 20.6 80 Phillips Bench 8200 5.1 18.4 28 25.9 33.0 78 Salt River Summit 7640 .0 .0 * 15.5 20.0 78 Snake River Station 6920 .1 .0 * 20.8 26.6 78 Somsen Ranch 6800 .0 .0 * 15.2 20.0 76 Spring Creek Divide 9000 16.0 19.7 81 24.8 28.1 88 Thumb Divide 7980 .1 .8 12* 16.2 22.8 71 Togwotee Pass 9580 16.5 22.9 72 27.7 29.8 93 Triple Peak 8500 1.4 7.4 19 25.8 30.3 85 Two Ocean Plateau 9240 18.2 28.2 65 24.7 33.0 75 Willow Creek 8080 .8 15.8 5 29.5 41.0 72 Younts Peak 8350 .0 11.5 0 19.3 19.6 98 ----- ----- Basin Index (%) 50 80 MADISON HEADWATERS IN WYOMING Black Bear 8170 12.0 33.2 36 33.2 44.7 74 Canyon 7870 .5 1.6 31 15.1 19.9 76 Madison Plateau 7750 3.6 13.8 26 22.3 31.6 71 West Yellowstone 6700 .1 .0 * 13.9 17.6 79 Whiskey Creek 6800 .2 5.0 4 18.7 24.4 77 ----- ----- Basin Index (%) 31 75 YELLOWSTONE HEADWATERS IN WYOMING Beartooth Lake 9360 19.5 21.4 91 23.0 24.2 95 Canyon 7870 .5 1.6 31 15.1 19.9 76 Evening Star 9200 18.3 23.4 78 33.4 33.4 100 Fisher Creek 9100 24.5 32.5 75 35.9 38.5 93 Monument Peak 8850 11.5 19.2 60 27.6 27.0 102 Northeast Entrance 7350 .1 .0 * 16.1 15.6 103 Parker Peak 9400 14.0 19.6 71 26.7 22.5 119 Sylvan Lake 8420 .1 14.7 1 24.5 27.7 88 Thumb Divide 7980 .1 .8 12* 16.2 22.8 71 Two Ocean Plateau 9240 18.2 28.2 65 24.7 33.0 75 White Mill 8700 16.7 21.9 76 26.2 29.0 90 Wolverine 7650 .0 .0 * 18.6 15.6 119 ----- ----- Basin Index (%) 67 93 WIND RIVER Burroughs Creek 8750 .1 -M * 18.3 -M * Castle Creek 8400 .0 -M * 11.4 -M * Cold Springs 9630 .0 .0 * 14.5 14.4 101 Deer Park 9700 8.0 10.0 80 20.7 26.0 80 Hobbs Park 10100 11.2 12.7 88 19.4 19.4 100 Kirwin 9550 4.7 8.0 59 15.5 15.9 97 Little Warm 9370 1.3 2.1 62 16.2 17.4 93 South Pass 9040 5.8 5.8 100 18.1 22.5 80 St. Lawrence Alt 8620 .0 .0 * 11.2 13.5 83 Togwotee Pass 9580 16.5 22.9 72 27.7 29.8 93 Townsend Creek 8700 4.5 .0 * 17.4 17.2 101 ----- ----- Basin Index (%) 85 91 BIGHORN BASIN Bald Mtn. 9380 16.2 18.8 86 19.6 22.1 89 Bear Trap Meadow 8200 .0 .0 * 14.4 12.6 114 Bone Springs Div 9350 16.4 14.0 117 17.4 20.9 83 Grave Springs 8550 .2 1.9 11 12.3 15.1 81 Kirwin 9550 4.7 8.0 59 15.5 15.9 97 Marquette 8760 1.5 -M * 13.2 -M * Middle Powder 7760 2.5 4.4 57 13.6 16.3 83 Owl Creek 8975 .0 .0 * 11.6 9.7 120 Powder River Pass 9480 7.2 4.7 153 14.8 17.3 86 Shell Creek 9580 14.5 14.9 97 17.2 18.5 93 Timber Creek 7950 .3 .0 * 13.4 12.2 110 ----- ----- Basin Index (%) 93 93 SHOSHONE RIVER Blackwater 9780 20.6 24.0 86 26.6 26.1 102 Evening Star 9200 18.3 23.4 78 33.4 33.4 100 Marquette 8760 1.5 -M * 13.2 -M * Sylvan Lake 8420 .1 14.7 1 24.5 27.7 88 Sylvan Road 7120 .0 .0 * 15.8 20.3 78 Younts Peak 8350 .0 11.5 0 19.3 19.6 98 ----- ----- Basin Index (%) 53 94 POWDER RIVER Bear Trap Meadow 8200 .0 .0 * 14.4 12.6 114 Cloud Peak Reservoir 9860 14.8 14.3 103 23.2 19.7 118 Grave Springs 8550 .2 1.9 11 12.3 15.1 81 Hansen Sawmill 8360 1.2 .0 * 15.9 13.0 122 Middle Powder 7760 2.5 4.4 57 13.6 16.3 83 Powder River Pass 9480 7.2 4.7 153 14.8 17.3 86 Soldier Park 8720 2.1 -M * 16.2 -M * ----- ----- Basin Index (%) 102 100 TONGUE RIVER Big Goose 7990 6.9 3.8 182 17.9 17.2 104 Bone Springs Div 9350 16.4 14.0 117 17.4 20.9 83 Burgess Junction 7880 9.5 7.6 125 18.7 17.0 110 Dome Lake 8880 11.1 5.4 206 20.0 19.1 105 Little Goose 8870 11.1 -M * 21.5 -M * Sucker Creek 8880 10.9 8.1 135 23.6 20.3 116 Tie Creek 6870 .0 .0 * 15.6 17.3 90 ----- ----- Basin Index (%) 141 101 BELLE FOURCHE Blind Park 6890 .1 .0 * 12.8 16.7 77 Cole Canyon 5910 .0 .0 * 10.4 14.9 70 North Rapid Creek 6130 .3 .0 * 12.5 14.6 86 ----- ----- Basin Index (%) * 77 CHEYENNE RIVER BASIN Blind Park 6890 .1 .0 * 12.8 16.7 77 North Rapid Creek 6130 .3 .0 * 12.5 14.6 86 ----- ----- Basin Index (%) * 81 UPPER N. PLATTE Arapaho Ridge 10960 15.6 17.3 90 25.7 28.5 90 Blackhall Mtn 9820 19.6 -M * 31.6 -M * Cinnabar Park 9574 11.6 11.5 101 25.4 29.6 86 Columbine 9160 .0 1.7 0* 24.0 30.7 78 Divide Peak 8880 .0 4.7 0 21.2 26.5 80 Joe Wright 10120 19.4 20.7 94 29.7 33.0 90 Laprele Creek 8375 .0 .0 * 16.4 17.0 96 Med Bow 10500 32.1 -M * 34.5 -M * Never Summer 10280 15.3 19.7 78 17.3 -M * North French Creek 10130 20.7 28.9 72 31.0 33.8 92 Old Battle 10000 24.2 32.2 75 33.2 42.2 79 Rawah 9020 .0 .4 0* 16.9 18.9 89 Sage Creek Basin 7850 -M .0 * 12.8 17.4 74 Sand Lake 10050 28.8 27.4 105 31.1 32.0 97 South Brush Creek 8440 .0 .0 * 12.1 20.2 60 Tower 10500 26.7 47.3 56 38.4 47.9 80 Webber Springs 9250 8.9 10.9 82 25.2 32.1 79 Whiskey Park 8950 13.5 20.9 65 28.8 33.9 85 Willow Creek Pass 9540 6.3 8.8 72 13.5 17.4 78 Zirkel 9340 1.0 8.1 12 30.5 33.4 91 ----- ----- Basin Index (%) 74 84 SWEETWATER Deer Park 9700 8.0 10.0 80 20.7 26.0 80 Larsen Creek 9000 .0 3.3 0 12.0 -M * South Pass 9040 5.8 5.8 100 18.1 22.5 80 ----- ----- Basin Index (%) 72 80 LOWER N. PLATTE Casper Mtn. 7900 .8 3.6 22 15.1 20.5 74 Laprele Creek 8375 .0 .0 * 16.4 17.0 96 Reno Hill 8400 6.1 2.6 235 -M 21.5 * Windy Peak 7900 .4 .0 * 15.5 14.9 104 ----- ----- Basin Index (%) 118 90 LARAMIE RIVER Brooklyn Lake 10240 14.7 15.5 95 30.1 27.3 110 Cinnabar Park 9574 11.6 11.5 101 25.4 29.6 86 Crow Creek 8330 .1 .0 * 14.7 15.2 97 Deadman Hill 10220 15.7 16.0 98 23.2 23.1 100 Rawah 9020 .0 .4 0* 16.9 18.9 89 Roach 9700 10.1 10.8 94 24.4 24.7 99 Windy Peak 7900 .4 .0 * 15.5 14.9 104 ----- ----- Basin Index (%) 97 98 S. PLATTE Crow Creek 8330 .1 .0 * 14.7 15.2 97 ----- ----- Basin Index (%) * 97 LITTLE SNAKE RIVER Battle Mountain 7440 .0 .0 * 12.6 18.6 68 Divide Peak 8880 .0 4.7 0 21.2 26.5 80 Elk River 8700 .0 .0 * 16.0 24.6 65 Elkhead Divide 8780 .1 -M * 19.7 -M * Little Snake River 8915 4.1 12.2 34 31.0 35.2 88 Old Battle 10000 24.2 32.2 75 33.2 42.2 79 Sage Creek Basin 7850 -M .0 * 12.8 17.4 74 Sandstone RS 8150 -M .0 * 15.4 22.5 68 Whiskey Park 8950 13.5 20.9 65 28.8 33.9 85 ----- ----- Basin Index (%) 60* 77 UPPER GREEN RIVER Big Sandy Opening 9080 .0 2.2 0 11.3 16.9 67 Blind Bull Sum 8650 16.9 19.4 87 15.1 23.3 65 East Rim Divide 7930 .1 .0 * 11.2 14.2 79 Elkhart Park G.S. 9400 .1 5.2 2 12.1 16.8 72 Gros Ventre Summit 8750 1.3 4.9 27 12.2 16.2 75 Gunsight Pass 9820 5.5 9.9 56 13.9 17.7 79 Indian Creek 9425 6.9 17.8 39 21.0 27.1 77 Kendall R.S. 7740 .0 .0 * 14.9 16.8 89 Larsen Creek 9000 .0 3.3 0 12.0 -M * Loomis Park 8240 .0 1.9 0 16.4 20.6 80 New Fork Lake 8340 .0 .0 * 12.2 13.6 90 Pocket Creek 9360 -M -M * -M -M * Snider Basin 8060 -M .0 * -M 16.8 * Spring Creek Divide 9000 16.0 19.7 81 24.8 28.1 88 Triple Peak 8500 1.4 7.4 19 25.8 30.3 85 ----- ----- Basin Index (%) 53 79 LOWER GREEN RIVER Blacks Fork Jct 8869 .4 -M * 11.8 -M * Buck Pasture 9632 .0 -M * 16.9 -M * EF Blacks Fork GS 9360 .0 -M * 14.2 -M * Hams Fork 7840 .0 .0 * 13.2 14.4 92 Henrys Fork 10182 -M -M * 14.8 -M * Hewinta 9500 .0 .0 * 15.2 17.8 85 Hickerson Park 9122 .0 .0 * 12.4 13.5 92 Hole-in-Rock 9168 .0 .0 * 13.4 13.1 102 Indian Creek 9425 6.9 17.8 39 21.0 27.1 77 Kelley R.S. 8180 .0 2.1 0 16.6 21.8 76 Spirit Lk 10235 1.0 -M * 17.8 -M * Steel Creek Park 10158 8.1 14.2 57 19.1 21.1 91 ----- ----- Basin Index (%) 44* 86 UPPER BEAR RIVER Bear River RS 8777 .0 -M * 12.0 -M * Bug Lake 7987 .2 3.8 5 16.7 23.6 71 Burts Miller Ranch 8000 .0 -M * 8.0 -M * Chalk Creek #1 9171 .4 14.6 3 19.6 30.9 63 Dry Bread Pond 8302 .0 .0 * 16.6 23.6 70 Giveout 6930 .0 .0 * 11.8 15.3 77 Hayden Fork 9130 .0 .0 * 19.7 25.9 76 Kelley R.S. 8180 .0 2.1 0 16.6 21.8 76 Lily Lake 9133 .1 .0 * 13.4 21.4 63 Monte Cristo 8932 .6 13.9 4 21.8 31.6 69 Salt River Summit 7640 .0 .0 * 15.5 20.0 78 Spring Creek Divide 9000 16.0 19.7 81 24.8 28.1 88 Trial Lake 9992 .6 15.4 4 19.1 29.4 65 ----- ----- Basin Index (%) 26* 72 ----------------------------------------------------------------------------- -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.