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: MAY 11 , 2020 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 6.5 3.9 167 21.2 23.7 89 Black Bear 8170 -M 36.8 * 35.2 43.2 81 Blind Bull Sum 8650 29.9 22.4 133 18.4 22.3 83 Cottonwood Creek 7670 16.3 12.5 130 33.2 29.0 114 East Rim Divide 7930 .1 5.7 2 12.3 13.6 90 Grand Targhee 9260 39.8 46.3 86 34.5 36.1 96 Granite Creek 6770 8.4 4.7 179 19.9 22.2 90 Grassy Lake 7265 21.9 25.3 87 36.8 40.7 90 Gros Ventre Summit 8750 9.9 9.5 104 15.3 15.5 99 Gunsight Pass 9820 12.7 12.2 104 16.1 17.1 94 Lewis Lake Divide 7850 19.1 29.0 66 34.3 39.9 86 Phillips Bench 8200 23.8 23.0 103 33.4 32.0 104 Salt River Summit 7640 1.4 3.9 36 17.8 19.2 93 Snake River Station 6920 3.6 1.8 200 23.3 25.7 91 Spring Creek Divide 9000 24.0 23.5 102 27.5 27.2 101 Thumb Divide 7980 7.2 7.9 91 18.7 21.9 85 Togwotee Pass 9580 27.4 25.4 108 30.5 28.7 106 Two Ocean Plateau 9240 32.9 29.5 112 29.2 31.7 92 Willow Creek 8080 23.5 20.8 113 41.3 39.4 105 Younts Peak 8350 4.2 15.3 27 17.3 18.7 93 ----- ----- Basin Index (%) 97 94 MADISON-GALLATIN Black Bear 8170 -M 36.8 * 35.2 43.2 81 Canyon 7870 8.9 7.1 125 17.4 19.0 92 Madison Plateau 7750 15.5 19.6 79 22.0 30.1 73 West Yellowstone 6700 .0 .0 * 10.4 16.7 62 Whiskey Creek 6800 9.2 10.3 89 19.6 23.2 84 ----- ----- Basin Index (%) 91 79 YELLOWSTONE Beartooth Lake 9360 25.4 23.0 110 25.0 23.2 108 Burnt Mtn 5880 .0 .0 * 17.5 17.8 98 Canyon 7870 8.9 7.1 125 17.4 19.0 92 Cole Creek 7850 18.8 17.2 109 17.2 18.3 94 Evening Star 9200 25.3 25.5 99 34.1 32.0 107 Fisher Creek 9100 33.9 34.4 99 38.0 36.8 103 Northeast Entrance 7350 .0 .8 0* 15.0 14.7 102 Parker Peak 9400 -M 22.1 * -M 21.3 * Sylvan Lake 8420 15.9 18.0 88 27.2 26.5 103 Thumb Divide 7980 7.2 7.9 91 18.7 21.9 85 Two Ocean Plateau 9240 32.9 29.5 112 29.2 31.7 92 White Mill 8700 28.1 24.8 113 25.3 27.7 91 Wolverine 7650 .1 .0 * 14.9 14.7 101 Younts Peak 8350 4.2 15.3 27 17.3 18.7 93 ----- ----- Basin Index (%) 99 98 WIND RIVER Burroughs Creek 8750 4.1 -M * 15.4 -M * Castle Creek 8400 .0 -M * 8.3 -M * Cold Springs 9630 .0 1.2 0 9.4 13.5 70 Deer Park 9700 7.8 14.4 54 16.3 24.9 65 Hobbs Park 10100 10.2 15.8 65 14.8 18.0 82 Kirwin 9550 7.2 10.9 66 12.6 15.0 84 Little Warm 9370 7.1 6.6 108 12.0 16.4 73 Owl Creek 8975 .1 .5 20* 8.8 8.8 100 South Pass 9040 5.7 11.4 50 13.7 21.5 64 St. Lawrence Alt 8620 .0 .8 0 9.3 12.6 74 Togwotee Pass 9580 27.4 25.4 108 30.5 28.7 106 Townsend Creek 8700 3.9 3.4 115 13.3 16.0 83 ----- ----- Basin Index (%) 77 80 BIGHORN BASIN Bald Mtn. 9380 21.9 20.7 106 18.6 21.2 88 Bear Trap Meadow 8200 .0 .0 * 11.1 11.8 94 Bone Springs Div 9350 18.5 16.6 111 17.1 19.9 86 Grave Springs 8550 5.9 7.5 79 11.4 14.4 79 Kirwin 9550 7.2 10.9 66 12.6 15.0 84 Marquette 8760 4.6 -M * 11.3 -M * Middle Powder 7760 9.0 10.5 86 13.4 15.5 86 Owl Creek 8975 .1 .5 20* 8.8 8.8 100 Powder River Pass 9480 9.0 9.0 100 15.6 16.4 95 Shell Creek 9580 15.8 16.8 94 15.8 17.7 89 Timber Creek 7950 .4 1.3 31 8.8 11.2 79 ----- ----- Basin Index (%) 94 88 SHOSHONE RIVER Blackwater 9780 22.7 24.6 92 26.9 24.7 109 Evening Star 9200 25.3 25.5 99 34.1 32.0 107 Marquette 8760 4.6 -M * 11.3 -M * Sylvan Lake 8420 15.9 18.0 88 27.2 26.5 103 Sylvan Road 7120 .1 1.2 8 19.1 19.4 98 Younts Peak 8350 4.2 15.3 27 17.3 18.7 93 ----- ----- Basin Index (%) 81 103 POWDER RIVER Bear Trap Meadow 8200 .0 .0 * 11.1 11.8 94 Cloud Peak Reservoir 9860 13.9 16.8 83 16.5 18.4 90 Grave Springs 8550 5.9 7.5 79 11.4 14.4 79 Hansen Sawmill 8360 .8 1.0 80 11.3 12.0 94 Middle Powder 7760 9.0 10.5 86 13.4 15.5 86 Powder River Pass 9480 9.0 9.0 100 15.6 16.4 95 Soldier Park 8720 .4 -M * 11.1 -M * ----- ----- Basin Index (%) 86 90 TONGUE RIVER Big Goose 7990 6.0 10.3 58 11.9 16.0 74 Bone Springs Div 9350 18.5 16.6 111 17.1 19.9 86 Burgess Junction 7880 11.2 11.4 98 14.4 16.2 89 Dome Lake 8880 11.2 11.1 101 12.7 18.1 70 Little Goose 8870 8.9 -M * -M -M * Sucker Creek 8880 10.6 12.7 83 16.1 19.2 84 Tie Creek 6870 .1 1.2 8 14.9 16.2 92 ----- ----- Basin Index (%) 91 82 BELLE FOURCHE Blind Park 6890 .0 .0 * 10.5 15.7 67 Cole Canyon 5910 -M .0 * -M 13.8 * ----- ----- Basin Index (%) * 67 CHEYENNE RIVER BASIN Blind Park 6890 .0 .0 * 10.5 15.7 67 North Rapid Creek 6130 .0 .0 * -M 13.8 * ----- ----- Basin Index (%) * 67 UPPER N. PLATTE Arapaho Ridge 10960 19.7 22.3 88 25.7 27.6 93 Blackhall Mtn 9820 26.2 -M * 34.1 -M * Columbine 9160 13.0 11.9 109 33.6 29.7 113 Divide Peak 8880 8.6 13.7 63 25.3 25.6 99 Joe Wright 10120 20.5 23.2 88 31.4 31.5 100 Laprele Creek 8375 2.3 2.0 115 14.8 16.2 91 Med Bow 10500 41.2 -M * 41.6 -M * Never Summer 10280 19.5 22.2 88 18.8 -M * North French Creek 10130 33.0 32.7 101 37.4 32.5 115 Old Battle 10000 33.0 36.9 89 35.5 40.9 87 Rawah 9020 3.2 2.4 133 17.8 18.3 97 Sage Creek Basin 7850 -M .0 * 14.5 16.9 86 Sand Lake 10050 32.0 31.7 101 32.7 30.7 107 South Brush Creek 8440 .0 4.4 0 16.4 19.1 86 Tower 10500 47.6 51.2 93 48.9 46.6 105 Webber Springs 9250 16.1 19.0 85 30.1 31.2 96 Whiskey Park 8950 23.9 26.5 90 35.7 33.0 108 Willow Creek Pass 9540 11.7 13.0 90 15.9 16.5 96 Zirkel 9340 12.9 19.3 67 -M 32.8 * ----- ----- Basin Index (%) 89 100 SWEETWATER Deer Park 9700 7.8 14.4 54 16.3 24.9 65 Larsen Creek 9000 .0 6.2 0 11.0 -M * South Pass 9040 5.7 11.4 50 13.7 21.5 64 ----- ----- Basin Index (%) 42 65 LOWER N. PLATTE Casper Mtn. 7900 9.1 11.1 82 14.2 19.6 72 Laprele Creek 8375 2.3 2.0 115 14.8 16.2 91 Reno Hill 8400 14.0 10.0 140 20.6 20.4 101 Windy Peak 7900 -M .0 * -M 13.9 * ----- ----- Basin Index (%) 110 88 LARAMIE RIVER Brooklyn Lake 10240 23.5 21.1 111 31.8 26.1 122 Cinnabar Park 9574 17.7 17.0 104 30.1 28.4 106 Crow Creek 8330 .1 .0 * 14.6 14.4 101 Deadman Hill 10220 17.0 18.5 92 20.6 21.8 94 Rawah 9020 3.2 2.4 133 17.8 18.3 97 Roach 9700 8.4 15.5 54 19.6 23.4 84 Windy Peak 7900 -M .0 * -M 13.9 * ----- ----- Basin Index (%) 94 102 S. PLATTE Black Mountain 8920 2.5 -M * 17.1 -M * Crow Creek 8330 .1 .0 * 14.6 14.4 101 Deadman Hill 10220 17.0 18.5 92 20.6 21.8 94 ----- ----- Basin Index (%) 92* 97 LITTLE SNAKE RIVER Battle Mountain 7440 .0 .0 * 17.3 18.0 96 Divide Peak 8880 8.6 13.7 63 25.3 25.6 99 Elk River 8700 5.0 7.0 71 20.5 23.8 86 Little Snake River 8915 17.3 20.1 86 37.2 34.4 108 Old Battle 10000 33.0 36.9 89 35.5 40.9 87 Sage Creek Basin 7850 -M .0 * 14.5 16.9 86 Sandstone RS 8150 .0 1.3 0* 19.1 21.9 87 Whiskey Park 8950 23.9 26.5 90 35.7 33.0 108 ----- ----- Basin Index (%) 83 96 UPPER GREEN RIVER Big Sandy Opening 9080 1.3 8.6 15 10.5 16.2 65 Blind Bull Sum 8650 29.9 22.4 133 18.4 22.3 83 East Rim Divide 7930 .1 5.7 2 12.3 13.6 90 Elkhart Park G.S. 9400 5.2 9.5 55 12.1 16.0 76 Gros Ventre Summit 8750 9.9 9.5 104 15.3 15.5 99 Gunsight Pass 9820 12.7 12.2 104 16.1 17.1 94 Indian Creek 9425 15.2 21.1 72 18.3 26.2 70 Kendall R.S. 7740 .0 .0 * 13.8 16.2 85 Loomis Park 8240 7.0 7.0 100 21.8 19.9 110 New Fork Lake 8340 .2 2.4 8 10.8 12.9 84 Pocket Creek 9360 -M -M * 9.8 -M * Snider Basin 8060 .0 7.2 0 15.3 16.3 94 Spring Creek Divide 9000 24.0 23.5 102 27.5 27.2 101 Triple Peak 8500 16.4 14.5 113 30.5 29.2 104 ----- ----- Basin Index (%) 85 90 LOWER GREEN RIVER Blacks Fork Jct 8869 .0 -M * 14.0 -M * Buck Pasture 9632 8.2 -M * 20.3 -M * EF Blacks Fork GS 9360 2.6 -M * 15.0 -M * Hams Fork 7840 .0 .2 0* 13.5 13.9 97 Hewinta 9500 .0 1.5 0 17.0 17.2 99 Hickerson Park 9122 .0 .0 * 13.1 12.9 102 Hole-in-Rock 9168 .1 .0 * 13.3 12.4 107 Indian Creek 9425 15.2 21.1 72 18.3 26.2 70 Kelley R.S. 8180 3.5 8.1 43 18.0 21.2 85 Spirit Lk 10235 10.1 -M * 19.9 -M * Steel Creek Park 10158 14.3 17.6 81 20.9 20.3 103 ----- ----- Basin Index (%) 68* 92 UPPER BEAR RIVER Bear River RS 8777 -M -M * -M -M * Bug Lake 7987 6.4 12.0 53 19.9 22.7 88 Burts Miller Ranch 8000 .0 -M * 7.9 -M * Chalk Creek #1 9171 -M 21.2 * -M 29.9 * Hayden Fork 9130 .4 5.4 7 23.2 25.0 93 Kelley R.S. 8180 3.5 8.1 43 18.0 21.2 85 Lily Lake 9133 .8 4.5 18 14.7 20.7 71 Monte Cristo 8932 16.5 21.0 79 27.9 30.8 91 Salt River Summit 7640 1.4 3.9 36 17.8 19.2 93 Spring Creek Divide 9000 24.0 23.5 102 27.5 27.2 101 ----- ----- Basin Index (%) 68 89 ----------------------------------------------------------------------------- -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.