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 4 , 2020 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 10.8 7.8 138 21.2 23.1 92 Black Bear 8170 35.3 37.3 95 35.2 42.2 83 Blind Bull Sum 8650 28.4 22.8 125 18.3 21.6 85 Cottonwood Creek 7670 21.3 14.4 148 33.3 27.8 120 East Rim Divide 7930 1.2 7.7 16 11.8 13.1 90 Grand Targhee 9260 40.6 45.7 89 34.5 35.2 98 Granite Creek 6770 12.8 7.6 168 -M 21.6 * Grassy Lake 7265 27.0 27.9 97 36.7 39.7 92 Gros Ventre Summit 8750 12.7 11.1 114 15.2 14.9 102 Gunsight Pass 9820 14.3 12.0 119 16.1 16.3 99 Lewis Lake Divide 7850 23.5 29.6 79 34.3 39.0 88 Phillips Bench 8200 27.9 24.5 114 33.3 31.0 107 Salt River Summit 7640 6.7 7.4 91 17.8 18.6 96 Snake River Station 6920 9.9 5.6 177 23.5 25.0 94 Spring Creek Divide 9000 26.4 24.3 109 27.6 26.5 104 Thumb Divide 7980 11.1 10.8 103 18.7 21.3 88 Togwotee Pass 9580 28.6 24.7 116 30.5 27.7 110 Two Ocean Plateau 9240 32.6 29.9 109 29.0 30.5 95 Willow Creek 8080 32.6 22.0 148 41.3 38.1 108 Younts Peak 8350 11.3 15.8 72 16.8 18.0 93 ----- ----- Basin Index (%) 107 97 MADISON-GALLATIN Black Bear 8170 35.3 37.3 95 35.2 42.2 83 Canyon 7870 11.4 9.1 125 17.3 18.2 95 Madison Plateau 7750 18.4 20.9 88 22.0 29.2 75 West Yellowstone 6700 .0 .2 0* 10.4 16.2 64 Whiskey Creek 6800 11.9 13.3 89 19.7 22.6 87 ----- ----- Basin Index (%) 95 81 YELLOWSTONE Beartooth Lake 9360 25.2 22.7 111 24.6 22.2 111 Burnt Mtn 5880 .0 .0 * 16.8 16.2 104 Canyon 7870 11.4 9.1 125 17.3 18.2 95 Cole Creek 7850 17.8 16.7 107 16.0 16.7 96 Evening Star 9200 25.7 24.9 103 33.7 30.8 109 Fisher Creek 9100 34.0 32.7 104 37.4 35.5 105 Northeast Entrance 7350 2.7 1.6 169 14.7 14.0 105 Parker Peak 9400 28.9 21.2 136 26.6 20.3 131 Sylvan Lake 8420 18.6 19.0 98 27.1 25.4 107 Thumb Divide 7980 11.1 10.8 103 18.7 21.3 88 Two Ocean Plateau 9240 32.6 29.9 109 29.0 30.5 95 White Mill 8700 29.5 24.0 123 24.9 26.6 94 Wolverine 7650 3.4 1.1 309 14.9 14.0 106 Younts Peak 8350 11.3 15.8 72 16.8 18.0 93 ----- ----- Basin Index (%) 110 103 WIND RIVER Burroughs Creek 8750 8.0 -M * 15.5 -M * Castle Creek 8400 .0 -M * 8.3 -M * Cold Springs 9630 .6 1.4 43 9.3 12.7 73 Deer Park 9700 10.9 15.4 71 16.2 23.8 68 Hobbs Park 10100 12.8 16.0 80 14.6 17.0 86 Kirwin 9550 10.3 10.6 97 12.5 14.1 89 Little Warm 9370 10.6 8.1 131 11.9 15.6 76 Owl Creek 8975 .0 .6 0 8.7 8.1 107 South Pass 9040 9.1 14.1 65 13.5 20.7 65 St. Lawrence Alt 8620 .0 2.0 0 9.3 11.8 79 Togwotee Pass 9580 28.6 24.7 116 30.5 27.7 110 Townsend Creek 8700 7.3 6.6 111 12.6 15.2 83 ----- ----- Basin Index (%) 91 83 BIGHORN BASIN Bald Mtn. 9380 21.4 20.4 105 18.3 20.0 92 Bear Trap Meadow 8200 .1 .4 25* 10.8 10.9 99 Bone Springs Div 9350 18.4 16.4 112 16.6 18.6 89 Grave Springs 8550 6.3 9.3 68 11.0 13.1 84 Kirwin 9550 10.3 10.6 97 12.5 14.1 89 Marquette 8760 5.7 -M * 11.0 -M * Middle Powder 7760 9.0 11.4 79 12.9 14.4 90 Owl Creek 8975 .0 .6 0 8.7 8.1 107 Powder River Pass 9480 9.8 9.1 108 15.0 15.4 97 Shell Creek 9580 15.9 16.0 99 15.7 16.6 95 Timber Creek 7950 .4 2.5 16 8.5 10.2 83 ----- ----- Basin Index (%) 95 92 SHOSHONE RIVER Blackwater 9780 25.1 25.8 97 26.7 23.8 112 Evening Star 9200 25.7 24.9 103 33.7 30.8 109 Marquette 8760 5.7 -M * 11.0 -M * Sylvan Lake 8420 18.6 19.0 98 27.1 25.4 107 Sylvan Road 7120 .0 4.1 0 18.6 18.8 99 Younts Peak 8350 11.3 15.8 72 16.8 18.0 93 ----- ----- Basin Index (%) 90 105 POWDER RIVER Bear Trap Meadow 8200 .1 .4 25* 10.8 10.9 99 Cloud Peak Reservoir 9860 13.5 16.3 83 15.7 17.0 92 Grave Springs 8550 6.3 9.3 68 11.0 13.1 84 Hansen Sawmill 8360 2.3 1.7 135 10.8 11.1 97 Middle Powder 7760 9.0 11.4 79 12.9 14.4 90 Powder River Pass 9480 9.8 9.1 108 15.0 15.4 97 Soldier Park 8720 1.3 -M * 10.6 -M * ----- ----- Basin Index (%) 85 93 TONGUE RIVER Big Goose 7990 6.7 9.4 71 11.3 14.4 78 Bone Springs Div 9350 18.4 16.4 112 16.6 18.6 89 Burgess Junction 7880 10.7 11.8 91 13.7 15.1 91 Dome Lake 8880 11.6 11.3 103 12.0 16.7 72 Little Goose 8870 8.7 -M * 10.5 -M * Sucker Creek 8880 10.7 11.9 90 15.2 17.7 86 Tie Creek 6870 .8 2.5 32 14.2 14.7 97 ----- ----- Basin Index (%) 93 85 BELLE FOURCHE Blind Park 6890 .0 .2 0* 10.1 14.6 69 Cole Canyon 5910 .0 .0 * 14.3 12.4 115 ----- ----- Basin Index (%) 0* 90 CHEYENNE RIVER BASIN Blind Park 6890 .0 .2 0* 10.1 14.6 69 North Rapid Creek 6130 .0 .0 * 9.7 12.6 77 ----- ----- Basin Index (%) 0* 73 UPPER N. PLATTE Arapaho Ridge 10960 22.6 22.3 101 25.6 26.5 97 Blackhall Mtn 9820 29.4 -M * 33.8 -M * Columbine 9160 19.9 17.1 116 33.4 28.9 116 Divide Peak 8880 13.5 17.5 77 24.8 24.8 100 Joe Wright 10120 23.0 22.9 100 31.1 30.4 102 Laprele Creek 8375 5.6 5.4 104 14.6 15.3 95 Med Bow 10500 42.9 -M * 41.1 -M * Never Summer 10280 21.9 21.8 100 18.5 -M * North French Creek 10130 34.8 32.7 106 36.9 31.2 118 Old Battle 10000 34.3 34.8 99 34.6 39.7 87 Rawah 9020 6.2 4.8 129 17.0 17.6 97 Sage Creek Basin 7850 1.4 .8 175* 14.5 16.4 88 Sand Lake 10050 33.3 31.6 105 32.1 29.5 109 South Brush Creek 8440 4.2 7.9 53 15.8 18.2 87 Tower 10500 47.2 50.7 93 48.4 45.3 107 Webber Springs 9250 18.5 21.1 88 29.7 30.3 98 Whiskey Park 8950 25.8 26.9 96 35.2 32.0 110 Willow Creek Pass 9540 13.7 14.5 94 15.7 16.0 98 Zirkel 9340 17.9 20.7 86 35.4 31.3 113 ----- ----- Basin Index (%) 97 103 SWEETWATER Deer Park 9700 10.9 15.4 71 16.2 23.8 68 Larsen Creek 9000 .0 8.3 0 11.0 -M * South Pass 9040 9.1 14.1 65 13.5 20.7 65 ----- ----- Basin Index (%) 53 67 LOWER N. PLATTE Casper Mtn. 7900 11.3 12.5 90 13.7 18.4 74 Laprele Creek 8375 5.6 5.4 104 14.6 15.3 95 Reno Hill 8400 15.0 12.1 124 20.1 19.3 104 Windy Peak 7900 2.4 3.1 77 11.3 13.2 86 ----- ----- Basin Index (%) 104 90 LARAMIE RIVER Brooklyn Lake 10240 27.0 23.0 117 31.2 25.1 124 Cinnabar Park 9574 20.6 18.8 110 29.8 27.3 109 Crow Creek 8330 .0 .0 * 14.4 13.7 105 Deadman Hill 10220 18.2 19.1 95 19.9 21.0 95 Rawah 9020 6.2 4.8 129 17.0 17.6 97 Roach 9700 11.8 17.1 69 19.2 22.6 85 Windy Peak 7900 2.4 3.1 77 11.3 13.2 86 ----- ----- Basin Index (%) 100 102 S. PLATTE Black Mountain 8920 6.2 -M * 16.8 -M * Crow Creek 8330 .0 .0 * 14.4 13.7 105 Deadman Hill 10220 18.2 19.1 95 19.9 21.0 95 ----- ----- Basin Index (%) 95* 99 LITTLE SNAKE RIVER Battle Mountain 7440 .1 .0 * 16.3 17.4 94 Divide Peak 8880 13.5 17.5 77 24.8 24.8 100 Elk River 8700 9.9 12.0 82 20.1 23.1 87 Little Snake River 8915 21.0 21.7 97 36.9 33.2 111 Old Battle 10000 34.3 34.8 99 34.6 39.7 87 Sage Creek Basin 7850 1.4 .8 175* 14.5 16.4 88 Sandstone RS 8150 5.7 4.6 124 18.4 21.0 88 Whiskey Park 8950 25.8 26.9 96 35.2 32.0 110 ----- ----- Basin Index (%) 94 97 UPPER GREEN RIVER Big Sandy Opening 9080 6.8 9.4 72 10.5 15.5 68 Blind Bull Sum 8650 28.4 22.8 125 18.3 21.6 85 East Rim Divide 7930 1.2 7.7 16 11.8 13.1 90 Elkhart Park G.S. 9400 8.3 10.6 78 12.0 15.2 79 Gros Ventre Summit 8750 12.7 11.1 114 15.2 14.9 102 Gunsight Pass 9820 14.3 12.0 119 16.1 16.3 99 Indian Creek 9425 19.3 22.1 87 18.3 25.3 72 Kendall R.S. 7740 4.6 2.6 177 13.8 15.7 88 Loomis Park 8240 10.6 10.0 106 21.4 19.2 111 New Fork Lake 8340 4.6 5.5 84 -M 12.3 * Pocket Creek 9360 -M -M * 9.9 -M * Snider Basin 8060 2.3 8.5 27 15.4 15.8 97 Spring Creek Divide 9000 26.4 24.3 109 27.6 26.5 104 Triple Peak 8500 22.0 16.3 135 30.4 28.2 108 ----- ----- Basin Index (%) 99 93 LOWER GREEN RIVER Blacks Fork Jct 8869 1.2 -M * 14.0 -M * Buck Pasture 9632 12.5 -M * 20.1 -M * EF Blacks Fork GS 9360 7.6 -M * 14.4 -M * Hams Fork 7840 .0 1.5 0 13.3 13.3 100 Hewinta 9500 4.4 4.2 105 16.9 16.5 102 Hickerson Park 9122 2.4 3.2 75 13.2 12.2 108 Hole-in-Rock 9168 2.1 1.7 124 13.3 11.8 113 Indian Creek 9425 19.3 22.1 87 18.3 25.3 72 Kelley R.S. 8180 8.6 10.4 83 18.0 20.5 88 Spirit Lk 10235 13.4 -M * 19.8 -M * Steel Creek Park 10158 16.4 17.4 94 20.8 19.5 107 ----- ----- Basin Index (%) 88 96 UPPER BEAR RIVER Bear River RS 8777 .0 -M * 12.9 -M * Bug Lake 7987 11.6 13.8 84 19.9 22.0 90 Burts Miller Ranch 8000 .0 -M * 7.9 -M * Chalk Creek #1 9171 14.5 23.4 62 21.3 28.9 74 Hayden Fork 9130 6.1 8.6 71 23.1 24.1 96 Kelley R.S. 8180 8.6 10.4 83 18.0 20.5 88 Lily Lake 9133 5.9 9.7 61 14.7 19.9 74 Monte Cristo 8932 21.3 25.3 84 28.0 29.7 94 Salt River Summit 7640 6.7 7.4 91 17.8 18.6 96 Spring Creek Divide 9000 26.4 24.3 109 27.6 26.5 104 ----- ----- Basin Index (%) 82 90 ----------------------------------------------------------------------------- -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.