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 SUNDAY: MAY 17 , 2020 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 2.3 .0 * 21.8 24.2 90 Black Bear 8170 -M 35.3 * 36.3 44.3 82 Blind Bull Sum 8650 29.2 21.5 136 19.2 23.0 83 Cottonwood Creek 7670 13.3 8.9 149 34.0 29.6 115 East Rim Divide 7930 .1 2.6 4 12.6 14.0 90 Grand Targhee 9260 40.3 44.0 92 35.7 36.7 97 Granite Creek 6770 4.3 .0 * 20.6 22.7 91 Grassy Lake 7265 18.5 20.4 91 37.8 41.5 91 Gros Ventre Summit 8750 7.6 7.6 100 15.8 15.9 99 Gunsight Pass 9820 11.8 11.7 101 16.7 17.5 95 Lewis Lake Divide 7850 17.2 24.5 70 35.2 40.6 87 Phillips Bench 8200 -M 21.0 * -M 32.6 * Salt River Summit 7640 .0 .6 0* 18.2 19.7 92 Snake River Station 6920 .1 .0 * 24.2 26.2 92 Spring Creek Divide 9000 22.9 22.0 104 28.3 27.8 102 Thumb Divide 7980 4.2 3.6 117 19.3 22.5 86 Togwotee Pass 9580 27.0 23.8 113 31.7 29.3 108 Two Ocean Plateau 9240 33.2 29.0 114 30.8 32.4 95 Willow Creek 8080 22.8 18.8 121 43.0 40.4 106 Younts Peak 8350 1.7 12.9 13 18.1 19.2 94 ----- ----- Basin Index (%) 102 95 MADISON-GALLATIN Black Bear 8170 -M 35.3 * 36.3 44.3 82 Canyon 7870 6.8 4.2 162 18.3 19.6 93 Madison Plateau 7750 13.3 15.9 84 22.9 31.1 74 West Yellowstone 6700 .0 .0 * 10.8 17.4 62 Whiskey Creek 6800 6.4 7.6 84 20.0 24.0 83 ----- ----- Basin Index (%) 96 79 YELLOWSTONE Beartooth Lake 9360 26.7 22.3 120 26.2 23.9 110 Burnt Mtn 5880 .0 .0 * 17.8 18.9 94 Canyon 7870 6.8 4.2 162 18.3 19.6 93 Cole Creek 7850 18.9 16.8 112 17.7 19.2 92 Evening Star 9200 25.5 24.9 102 35.3 32.9 107 Fisher Creek 9100 35.8 33.6 107 40.2 37.9 106 Northeast Entrance 7350 .0 .0 * 16.3 15.3 107 Parker Peak 9400 -M 20.9 * -M 22.1 * Sylvan Lake 8420 14.4 16.3 88 28.3 27.2 104 Thumb Divide 7980 4.2 3.6 117 19.3 22.5 86 Two Ocean Plateau 9240 33.2 29.0 114 30.8 32.4 95 White Mill 8700 28.5 23.7 120 26.8 28.6 94 Wolverine 7650 .1 .0 * 15.5 15.3 101 Younts Peak 8350 1.7 12.9 13 18.1 19.2 94 ----- ----- Basin Index (%) 105 99 WIND RIVER Burroughs Creek 8750 .3 -M * 15.8 -M * Castle Creek 8400 .0 -M * 8.8 -M * Cold Springs 9630 .1 .0 * 9.7 14.2 68 Deer Park 9700 5.2 12.4 42 16.7 25.7 65 Hobbs Park 10100 7.4 14.4 51 15.4 19.0 81 Kirwin 9550 3.8 9.7 39 12.6 15.6 81 Little Warm 9370 4.2 4.9 86 12.5 17.1 73 Owl Creek 8975 .1 .0 * 9.0 9.4 96 South Pass 9040 1.9 9.2 21 14.2 22.2 64 St. Lawrence Alt 8620 .0 .0 * 9.6 13.2 73 Togwotee Pass 9580 27.0 23.8 113 31.7 29.3 108 Townsend Creek 8700 .1 .3 33* 13.9 16.8 83 ----- ----- Basin Index (%) 67 80 BIGHORN BASIN Bald Mtn. 9380 22.5 20.3 111 19.6 21.8 90 Bear Trap Meadow 8200 .0 .0 * 11.9 12.4 96 Bone Springs Div 9350 18.9 15.3 124 18.0 20.5 88 Grave Springs 8550 3.0 5.2 58 11.6 14.8 78 Kirwin 9550 3.8 9.7 39 12.6 15.6 81 Marquette 8760 1.8 -M * 11.6 -M * Middle Powder 7760 5.4 7.7 70 13.7 16.0 86 Owl Creek 8975 .1 .0 * 9.0 9.4 96 Powder River Pass 9480 9.3 7.4 126 16.8 17.0 99 Shell Creek 9580 16.4 16.1 102 16.4 18.3 90 Timber Creek 7950 .3 .0 * 9.0 11.9 76 ----- ----- Basin Index (%) 98 88 SHOSHONE RIVER Blackwater 9780 23.6 24.9 95 28.0 25.6 109 Evening Star 9200 25.5 24.9 102 35.3 32.9 107 Marquette 8760 1.8 -M * 11.6 -M * Sylvan Lake 8420 14.4 16.3 88 28.3 27.2 104 Sylvan Road 7120 .0 .0 * 19.1 20.0 96 Younts Peak 8350 1.7 12.9 13 18.1 19.2 94 ----- ----- Basin Index (%) 83 103 POWDER RIVER Bear Trap Meadow 8200 .0 .0 * 11.9 12.4 96 Cloud Peak Reservoir 9860 13.4 15.8 85 17.1 19.3 89 Grave Springs 8550 3.0 5.2 58 11.6 14.8 78 Hansen Sawmill 8360 .1 .0 * 12.6 12.6 100 Middle Powder 7760 5.4 7.7 70 13.7 16.0 86 Powder River Pass 9480 9.3 7.4 126 16.8 17.0 99 Soldier Park 8720 .3 -M * 12.2 -M * ----- ----- Basin Index (%) 86 91 TONGUE RIVER Big Goose 7990 4.8 7.5 64 12.6 16.8 75 Bone Springs Div 9350 18.9 15.3 124 18.0 20.5 88 Burgess Junction 7880 9.8 9.8 100 14.6 16.7 87 Dome Lake 8880 10.3 8.5 121 13.4 18.7 72 Little Goose 8870 7.8 -M * -M -M * Sucker Creek 8880 9.6 10.3 93 16.5 19.9 83 Tie Creek 6870 .0 .0 * 15.5 16.9 92 ----- ----- Basin Index (%) 104 83 BELLE FOURCHE Blind Park 6890 .0 .0 * 11.2 16.4 68 Cole Canyon 5910 -M .0 * 16.4 14.6 112 ----- ----- Basin Index (%) * 89 CHEYENNE RIVER BASIN Blind Park 6890 .0 .0 * 11.2 16.4 68 North Rapid Creek 6130 .0 .0 * -M 14.3 * ----- ----- Basin Index (%) * 68 UPPER N. PLATTE Arapaho Ridge 10960 19.3 20.5 94 26.6 28.4 94 Blackhall Mtn 9820 24.2 -M * 35.2 -M * Columbine 9160 8.4 6.4 131 34.6 30.4 114 Divide Peak 8880 2.8 8.6 33 25.7 26.2 98 Joe Wright 10120 18.8 22.3 84 32.9 32.5 101 Laprele Creek 8375 .0 .0 * 14.9 16.6 90 Med Bow 10500 40.7 -M * 43.2 -M * Never Summer 10280 18.2 21.7 84 19.7 -M * North French Creek 10130 32.8 31.3 105 39.2 33.4 117 Old Battle 10000 32.2 33.9 95 36.5 41.8 87 Rawah 9020 .0 .9 0* 18.7 18.8 99 Sage Creek Basin 7850 -M .0 * 15.3 17.2 89 Sand Lake 10050 30.4 29.3 104 33.7 31.5 107 South Brush Creek 8440 .0 .5 0* 17.6 19.8 89 Tower 10500 47.0 49.0 96 50.4 47.5 106 Webber Springs 9250 13.0 14.8 88 31.0 31.8 97 Whiskey Park 8950 19.5 23.8 82 36.8 33.7 109 Willow Creek Pass 9540 9.1 10.6 86 16.4 17.1 96 Zirkel 9340 7.2 14.3 50 36.5 33.3 110 ----- ----- Basin Index (%) 90 101 SWEETWATER Deer Park 9700 5.2 12.4 42 16.7 25.7 65 Larsen Creek 9000 .0 4.5 0 11.6 -M * South Pass 9040 1.9 9.2 21 14.2 22.2 64 ----- ----- Basin Index (%) 27 65 LOWER N. PLATTE Casper Mtn. 7900 4.9 7.4 66 14.4 20.1 72 Laprele Creek 8375 .0 .0 * 14.9 16.6 90 Reno Hill 8400 10.5 6.4 164 20.8 21.0 99 Windy Peak 7900 -M .0 * -M 14.4 * ----- ----- Basin Index (%) 112 87 LARAMIE RIVER Brooklyn Lake 10240 21.0 18.7 112 32.8 26.9 122 Cinnabar Park 9574 15.5 14.4 108 31.1 29.4 106 Crow Creek 8330 .0 .0 * 15.6 15.0 104 Deadman Hill 10220 14.9 17.9 83 21.5 22.7 95 Rawah 9020 .0 .9 0* 18.7 18.8 99 Roach 9700 4.7 13.1 36 20.5 24.3 84 Windy Peak 7900 -M .0 * -M 14.4 * ----- ----- Basin Index (%) 86 102 S. PLATTE Black Mountain 8920 .6 -M * 17.9 -M * Crow Creek 8330 .0 .0 * 15.6 15.0 104 Deadman Hill 10220 14.9 17.9 83 21.5 22.7 95 ----- ----- Basin Index (%) 83* 98 LITTLE SNAKE RIVER Battle Mountain 7440 .0 .0 * 17.4 18.5 94 Divide Peak 8880 2.8 8.6 33 25.7 26.2 98 Elk River 8700 .0 1.2 0* 21.0 24.4 86 Little Snake River 8915 12.8 16.5 78 38.4 35.0 110 Old Battle 10000 32.2 33.9 95 36.5 41.8 87 Sage Creek Basin 7850 -M .0 * 15.3 17.2 89 Sandstone RS 8150 .0 .0 * 19.8 22.3 89 Whiskey Park 8950 19.5 23.8 82 36.8 33.7 109 ----- ----- Basin Index (%) 80 96 UPPER GREEN RIVER Big Sandy Opening 9080 .2 6.1 3 11.1 16.6 67 Blind Bull Sum 8650 29.2 21.5 136 19.2 23.0 83 East Rim Divide 7930 .1 2.6 4 12.6 14.0 90 Elkhart Park G.S. 9400 3.1 7.5 41 12.6 16.5 76 Gros Ventre Summit 8750 7.6 7.6 100 15.8 15.9 99 Gunsight Pass 9820 11.8 11.7 101 16.7 17.5 95 Indian Creek 9425 13.3 20.5 65 18.7 26.8 70 Kendall R.S. 7740 .0 .0 * 14.2 16.6 86 Loomis Park 8240 4.1 4.8 85 22.5 20.4 110 New Fork Lake 8340 .0 .4 0* 11.2 13.4 84 Pocket Creek 9360 -M -M * 10.3 -M * Snider Basin 8060 .0 2.9 0 15.9 16.6 96 Spring Creek Divide 9000 22.9 22.0 104 28.3 27.8 102 Triple Peak 8500 14.2 11.1 128 31.0 30.0 103 ----- ----- Basin Index (%) 90 90 LOWER GREEN RIVER Blacks Fork Jct 8869 .0 -M * 14.0 -M * Buck Pasture 9632 4.8 -M * 20.5 -M * EF Blacks Fork GS 9360 .0 -M * 15.7 -M * Hams Fork 7840 .0 .0 * 13.8 14.2 97 Hewinta 9500 .0 .0 * 17.0 17.6 97 Hickerson Park 9122 .0 .0 * 13.4 13.3 101 Hole-in-Rock 9168 .0 .0 * 13.4 12.8 105 Indian Creek 9425 13.3 20.5 65 18.7 26.8 70 Kelley R.S. 8180 .0 5.1 0 18.3 21.6 85 Spirit Lk 10235 7.0 -M * 20.2 -M * Steel Creek Park 10158 12.4 15.8 78 21.0 20.8 101 ----- ----- Basin Index (%) 62* 91 UPPER BEAR RIVER Bear River RS 8777 .0 -M * 12.9 -M * Bug Lake 7987 1.0 8.4 12 20.1 23.2 87 Burts Miller Ranch 8000 .0 -M * 7.9 -M * Chalk Creek #1 9171 5.9 18.0 33 21.5 30.6 70 Hayden Fork 9130 .0 1.1 0* 23.2 25.6 91 Kelley R.S. 8180 .0 5.1 0 18.3 21.6 85 Lily Lake 9133 .1 .0 * 14.8 21.2 70 Monte Cristo 8932 12.8 17.5 73 28.3 31.4 90 Salt River Summit 7640 .0 .6 0* 18.2 19.7 92 Spring Creek Divide 9000 22.9 22.0 104 28.3 27.8 102 ----- ----- Basin Index (%) 59 86 ----------------------------------------------------------------------------- -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.