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 SATURDAY: MAY 2 , 2020 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 12.3 8.9 138 21.2 22.9 93 Black Bear 8170 -M 37.4 * 35.2 41.8 84 Blind Bull Sum 8650 28.5 23.0 124 18.1 21.4 85 Cottonwood Creek 7670 22.1 15.0 147 33.0 27.6 120 East Rim Divide 7930 3.4 8.2 41 11.7 13.0 90 Grand Targhee 9260 40.9 45.1 91 34.6 34.8 99 Granite Creek 6770 13.9 8.1 172 -M 21.4 * Grassy Lake 7265 28.3 28.7 99 36.7 39.4 93 Gros Ventre Summit 8750 13.3 11.5 116 15.2 14.7 103 Gunsight Pass 9820 14.5 12.3 118 15.9 16.1 99 Lewis Lake Divide 7850 24.7 29.9 83 34.3 38.7 89 Phillips Bench 8200 28.9 25.1 115 33.3 30.7 108 Salt River Summit 7640 8.0 7.8 103 17.6 18.4 96 Snake River Station 6920 11.2 6.8 165 23.7 24.8 96 Spring Creek Divide 9000 26.8 24.3 110 27.3 26.3 104 Thumb Divide 7980 12.8 11.9 108 18.7 21.0 89 Togwotee Pass 9580 28.7 24.8 116 30.4 27.4 111 Two Ocean Plateau 9240 32.0 29.8 107 29.0 30.2 96 Willow Creek 8080 -M 22.6 * 40.8 37.7 108 Younts Peak 8350 13.1 15.6 84 16.6 17.7 94 ----- ----- Basin Index (%) 108 98 MADISON-GALLATIN Black Bear 8170 -M 37.4 * 35.2 41.8 84 Canyon 7870 12.7 10.0 127 17.3 18.1 96 Madison Plateau 7750 19.4 21.2 92 22.0 29.0 76 West Yellowstone 6700 .2 1.2 17 10.3 16.0 64 Whiskey Creek 6800 12.9 14.2 91 19.6 22.4 88 ----- ----- Basin Index (%) 97 82 YELLOWSTONE Beartooth Lake 9360 25.4 22.7 112 24.3 22.0 110 Burnt Mtn 5880 1.4 .0 * 16.3 16.0 102 Canyon 7870 12.7 10.0 127 17.3 18.1 96 Cole Creek 7850 18.3 16.6 110 16.0 16.5 97 Evening Star 9200 26.3 24.8 106 33.6 30.5 110 Fisher Creek 9100 34.1 32.6 105 37.4 35.2 106 Northeast Entrance 7350 4.1 2.4 171 14.7 13.8 107 Parker Peak 9400 29.5 21.2 139 26.6 20.1 132 Sylvan Lake 8420 18.9 19.5 97 27.0 25.1 108 Thumb Divide 7980 12.8 11.9 108 18.7 21.0 89 Two Ocean Plateau 9240 32.0 29.8 107 29.0 30.2 96 White Mill 8700 30.3 23.8 127 24.8 26.4 94 Wolverine 7650 5.7 1.9 300 14.9 13.8 108 Younts Peak 8350 13.1 15.6 84 16.6 17.7 94 ----- ----- Basin Index (%) 114 104 WIND RIVER Burroughs Creek 8750 9.3 -M * 15.5 -M * Castle Creek 8400 .0 -M * 8.3 -M * Cold Springs 9630 2.5 1.2 208 9.3 12.5 74 Deer Park 9700 11.7 15.8 74 16.2 23.5 69 Hobbs Park 10100 13.7 16.0 86 14.6 16.8 87 Kirwin 9550 11.1 10.5 106 12.5 13.9 90 Little Warm 9370 11.0 8.6 128 11.9 15.4 77 Owl Creek 8975 .2 .8 25 8.7 8.0 109 South Pass 9040 10.2 14.7 69 13.5 20.5 66 St. Lawrence Alt 8620 .0 2.1 0 9.3 11.6 80 Togwotee Pass 9580 28.7 24.8 116 30.4 27.4 111 Townsend Creek 8700 8.4 7.3 115 12.5 15.0 83 ----- ----- Basin Index (%) 96 84 BIGHORN BASIN Bald Mtn. 9380 21.9 20.5 107 18.3 19.8 92 Bear Trap Meadow 8200 1.9 .7 271 10.6 10.7 99 Bone Springs Div 9350 19.0 16.5 115 16.6 18.3 91 Grave Springs 8550 7.4 9.5 78 11.0 13.0 85 Kirwin 9550 11.1 10.5 106 12.5 13.9 90 Marquette 8760 6.6 -M * 11.0 -M * Middle Powder 7760 10.1 11.5 88 12.9 14.2 91 Owl Creek 8975 .2 .8 25 8.7 8.0 109 Powder River Pass 9480 10.7 9.2 116 14.9 15.1 99 Shell Creek 9580 16.5 15.9 104 15.6 16.4 95 Timber Creek 7950 .4 3.0 13 8.4 10.1 83 ----- ----- Basin Index (%) 101 93 SHOSHONE RIVER Blackwater 9780 25.7 25.5 101 26.7 23.6 113 Evening Star 9200 26.3 24.8 106 33.6 30.5 110 Marquette 8760 6.6 -M * 11.0 -M * Sylvan Lake 8420 18.9 19.5 97 27.0 25.1 108 Sylvan Road 7120 1.0 5.2 19 18.7 18.6 101 Younts Peak 8350 13.1 15.6 84 16.6 17.7 94 ----- ----- Basin Index (%) 94 106 POWDER RIVER Bear Trap Meadow 8200 1.9 .7 271 10.6 10.7 99 Cloud Peak Reservoir 9860 14.3 16.4 87 15.7 16.7 94 Grave Springs 8550 7.4 9.5 78 11.0 13.0 85 Hansen Sawmill 8360 3.5 2.1 167 10.6 11.0 96 Middle Powder 7760 10.1 11.5 88 12.9 14.2 91 Powder River Pass 9480 10.7 9.2 116 14.9 15.1 99 Soldier Park 8720 2.9 -M * 10.6 -M * ----- ----- Basin Index (%) 97 94 TONGUE RIVER Big Goose 7990 7.7 9.2 84 11.3 14.2 80 Bone Springs Div 9350 19.0 16.5 115 16.6 18.3 91 Burgess Junction 7880 11.5 12.0 96 13.6 14.9 91 Dome Lake 8880 12.6 11.4 111 11.9 16.6 72 Little Goose 8870 9.7 -M * -M -M * Sucker Creek 8880 12.0 12.0 100 15.1 17.5 86 Tie Creek 6870 2.2 2.6 85 14.2 14.5 98 ----- ----- Basin Index (%) 102 86 BELLE FOURCHE Blind Park 6890 -M .3 * 9.7 14.5 67 Cole Canyon 5910 -M .4 * -M 12.1 * ----- ----- Basin Index (%) * 67 CHEYENNE RIVER BASIN Blind Park 6890 -M .3 * 9.7 14.5 67 North Rapid Creek 6130 .0 .7 0 9.4 12.4 76 ----- ----- Basin Index (%) 0 71 UPPER N. PLATTE Arapaho Ridge 10960 23.1 22.3 104 25.5 26.3 97 Blackhall Mtn 9820 29.7 -M * 32.8 -M * Columbine 9160 21.9 17.8 123 33.1 28.7 115 Divide Peak 8880 14.6 18.0 81 24.1 24.4 99 Joe Wright 10120 23.5 23.1 102 30.9 30.0 103 Laprele Creek 8375 6.8 5.8 117 14.4 15.1 95 Med Bow 10500 43.3 -M * 39.9 -M * Never Summer 10280 22.4 21.8 103 18.4 -M * North French Creek 10130 34.6 32.8 105 35.9 30.8 117 Old Battle 10000 33.6 34.7 97 33.3 39.3 85 Rawah 9020 7.4 5.6 132 16.8 17.3 97 Sage Creek Basin 7850 3.1 1.1 282* 13.9 16.2 86 Sand Lake 10050 32.9 31.4 105 30.8 29.2 105 South Brush Creek 8440 5.0 8.8 57 14.8 17.9 83 Tower 10500 46.4 50.2 92 47.5 44.9 106 Webber Springs 9250 19.2 21.5 89 28.7 30.1 95 Whiskey Park 8950 26.7 26.6 100 34.6 31.6 109 Willow Creek Pass 9540 14.7 14.3 103 15.7 15.8 99 Zirkel 9340 20.2 20.9 97 35.0 31.1 113 ----- ----- Basin Index (%) 100 101 SWEETWATER Deer Park 9700 11.7 15.8 74 16.2 23.5 69 Larsen Creek 9000 .1 8.9 1 11.0 -M * South Pass 9040 10.2 14.7 69 13.5 20.5 66 ----- ----- Basin Index (%) 56 68 LOWER N. PLATTE Casper Mtn. 7900 12.5 13.0 96 13.6 18.1 75 Laprele Creek 8375 6.8 5.8 117 14.4 15.1 95 Reno Hill 8400 15.7 12.4 127 19.9 19.0 105 Windy Peak 7900 4.1 3.7 111 11.1 13.0 85 ----- ----- Basin Index (%) 112 90 LARAMIE RIVER Brooklyn Lake 10240 27.7 23.3 119 30.7 24.8 124 Cinnabar Park 9574 21.3 19.2 111 29.4 27.0 109 Crow Creek 8330 .0 .0 * 13.5 13.5 100 Deadman Hill 10220 19.2 19.1 101 19.7 20.8 95 Rawah 9020 7.4 5.6 132 16.8 17.3 97 Roach 9700 12.9 17.1 75 19.0 22.4 85 Windy Peak 7900 4.1 3.7 111 11.1 13.0 85 ----- ----- Basin Index (%) 105 101 S. PLATTE Black Mountain 8920 7.2 -M * 16.5 -M * Crow Creek 8330 .0 .0 * 13.5 13.5 100 Deadman Hill 10220 19.2 19.1 101 19.7 20.8 95 ----- ----- Basin Index (%) 101* 97 LITTLE SNAKE RIVER Battle Mountain 7440 .1 .0 * 15.8 17.2 92 Divide Peak 8880 14.6 18.0 81 24.1 24.4 99 Elk River 8700 11.4 12.9 88 20.0 22.8 88 Little Snake River 8915 21.9 22.1 99 36.0 32.9 109 Old Battle 10000 33.6 34.7 97 33.3 39.3 85 Sage Creek Basin 7850 3.1 1.1 282* 13.9 16.2 86 Sandstone RS 8150 6.7 5.6 120 17.6 20.8 85 Whiskey Park 8950 26.7 26.6 100 34.6 31.6 109 ----- ----- Basin Index (%) 98 95 UPPER GREEN RIVER Big Sandy Opening 9080 7.9 10.2 77 10.4 15.2 68 Blind Bull Sum 8650 28.5 23.0 124 18.1 21.4 85 East Rim Divide 7930 3.4 8.2 41 11.7 13.0 90 Elkhart Park G.S. 9400 8.8 11.1 79 11.9 15.1 79 Gros Ventre Summit 8750 13.3 11.5 116 15.2 14.7 103 Gunsight Pass 9820 14.5 12.3 118 15.9 16.1 99 Indian Creek 9425 20.0 22.8 88 18.2 25.1 73 Kendall R.S. 7740 5.7 3.8 150 13.7 15.6 88 Loomis Park 8240 11.6 10.8 107 21.2 19.0 112 New Fork Lake 8340 5.5 6.3 87 -M 12.2 * Pocket Creek 9360 -M -M * 9.7 -M * Snider Basin 8060 3.8 9.1 42 15.3 15.7 97 Spring Creek Divide 9000 26.8 24.3 110 27.3 26.3 104 Triple Peak 8500 23.3 17.1 136 30.3 28.0 108 ----- ----- Basin Index (%) 102 93 LOWER GREEN RIVER Blacks Fork Jct 8869 1.9 -M * 13.5 -M * Buck Pasture 9632 12.6 -M * 19.4 -M * EF Blacks Fork GS 9360 8.0 -M * 13.8 -M * Hams Fork 7840 1.4 2.5 56 12.9 13.2 98 Hewinta 9500 4.7 4.6 102 16.3 16.3 100 Hickerson Park 9122 3.0 3.9 77 12.4 12.1 102 Hole-in-Rock 9168 2.6 2.2 118 12.6 11.6 109 Indian Creek 9425 20.0 22.8 88 18.2 25.1 73 Kelley R.S. 8180 9.6 11.2 86 17.8 20.2 88 Spirit Lk 10235 13.6 -M * 19.5 -M * Steel Creek Park 10158 15.9 17.2 92 20.1 19.2 105 ----- ----- Basin Index (%) 89 94 UPPER BEAR RIVER Bear River RS 8777 .0 -M * 12.6 -M * Bug Lake 7987 12.7 14.7 86 19.9 21.8 91 Burts Miller Ranch 8000 .0 -M * 7.8 -M * Chalk Creek #1 9171 15.6 24.0 65 21.1 28.6 74 Hayden Fork 9130 6.8 9.1 75 22.5 23.9 94 Kelley R.S. 8180 9.6 11.2 86 17.8 20.2 88 Lily Lake 9133 6.6 10.0 66 14.1 19.6 72 Monte Cristo 8932 23.1 26.2 88 28.0 29.3 96 Salt River Summit 7640 8.0 7.8 103 17.6 18.4 96 Spring Creek Divide 9000 26.8 24.3 110 27.3 26.3 104 ----- ----- Basin Index (%) 86 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.