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 3 , 2020 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 11.4 8.4 136 21.2 22.9 93 Black Bear 8170 -M 37.3 * 35.2 42.0 84 Blind Bull Sum 8650 28.1 22.9 123 18.1 21.5 84 Cottonwood Creek 7670 21.5 14.7 146 32.9 27.7 119 East Rim Divide 7930 2.3 7.9 29 11.8 13.0 91 Grand Targhee 9260 40.9 45.5 90 34.5 34.9 99 Granite Creek 6770 13.3 7.8 171 -M 21.5 * Grassy Lake 7265 27.6 28.3 98 36.7 39.5 93 Gros Ventre Summit 8750 12.9 11.3 114 15.2 14.7 103 Gunsight Pass 9820 14.0 12.1 116 16.0 16.2 99 Lewis Lake Divide 7850 24.0 29.7 81 34.3 38.8 88 Phillips Bench 8200 28.3 24.8 114 33.3 30.9 108 Salt River Summit 7640 7.5 7.6 99 17.6 18.5 95 Snake River Station 6920 10.4 6.2 168 23.6 24.9 95 Spring Creek Divide 9000 26.3 24.3 108 27.3 26.4 103 Thumb Divide 7980 11.9 11.3 105 18.7 21.1 89 Togwotee Pass 9580 28.4 24.7 115 30.4 27.5 111 Two Ocean Plateau 9240 32.4 29.9 108 29.0 30.3 96 Willow Creek 8080 33.2 22.3 149 40.8 37.9 108 Younts Peak 8350 12.5 15.7 80 16.8 17.8 94 ----- ----- Basin Index (%) 109 97 MADISON-GALLATIN Black Bear 8170 -M 37.3 * 35.2 42.0 84 Canyon 7870 12.1 9.6 126 17.3 18.1 96 Madison Plateau 7750 18.7 21.0 89 22.0 29.1 76 West Yellowstone 6700 .1 .6 17* 10.3 16.0 64 Whiskey Creek 6800 12.3 13.8 89 19.6 22.5 87 ----- ----- Basin Index (%) 96 82 YELLOWSTONE Beartooth Lake 9360 25.0 22.7 110 24.6 22.1 111 Burnt Mtn 5880 .5 .0 * 16.0 16.1 99 Canyon 7870 12.1 9.6 126 17.3 18.1 96 Cole Creek 7850 18.1 16.7 108 16.0 16.6 96 Evening Star 9200 25.5 24.8 103 33.7 30.6 110 Fisher Creek 9100 34.1 32.6 105 37.4 35.4 106 Northeast Entrance 7350 3.3 2.0 165 14.7 13.9 106 Parker Peak 9400 -M 21.2 * -M 20.2 * Sylvan Lake 8420 18.4 19.3 95 27.0 25.3 107 Thumb Divide 7980 11.9 11.3 105 18.7 21.1 89 Two Ocean Plateau 9240 32.4 29.9 108 29.0 30.3 96 White Mill 8700 29.9 23.9 125 24.9 26.5 94 Wolverine 7650 4.6 1.4 329 14.8 13.9 106 Younts Peak 8350 12.5 15.7 80 16.8 17.8 94 ----- ----- Basin Index (%) 109 101 WIND RIVER Burroughs Creek 8750 8.7 -M * 15.5 -M * Castle Creek 8400 .0 -M * 8.3 -M * Cold Springs 9630 1.6 1.3 123 9.3 12.6 74 Deer Park 9700 11.2 15.7 71 16.2 23.6 69 Hobbs Park 10100 13.2 16.0 82 14.6 16.9 86 Kirwin 9550 10.8 10.6 102 12.5 14.0 89 Little Warm 9370 10.6 8.4 126 12.0 15.5 77 Owl Creek 8975 .1 .7 14 8.7 8.1 107 South Pass 9040 9.7 14.4 67 13.5 20.5 66 St. Lawrence Alt 8620 .0 2.1 0 9.3 11.7 79 Togwotee Pass 9580 28.4 24.7 115 30.4 27.5 111 Townsend Creek 8700 7.9 6.9 114 12.6 15.1 83 ----- ----- Basin Index (%) 93 84 BIGHORN BASIN Bald Mtn. 9380 21.7 20.5 106 18.4 19.9 92 Bear Trap Meadow 8200 .7 .6 117 10.7 10.8 99 Bone Springs Div 9350 18.9 16.4 115 16.6 18.4 90 Grave Springs 8550 6.9 9.4 73 11.0 13.0 85 Kirwin 9550 10.8 10.6 102 12.5 14.0 89 Marquette 8760 6.3 -M * 11.0 -M * Middle Powder 7760 9.7 11.4 85 12.9 14.3 90 Owl Creek 8975 .1 .7 14 8.7 8.1 107 Powder River Pass 9480 10.3 9.1 113 15.0 15.2 99 Shell Creek 9580 16.2 16.0 101 15.6 16.5 95 Timber Creek 7950 .4 2.7 15 8.5 10.2 83 ----- ----- Basin Index (%) 98 93 SHOSHONE RIVER Blackwater 9780 25.1 25.7 98 26.8 23.7 113 Evening Star 9200 25.5 24.8 103 33.7 30.6 110 Marquette 8760 6.3 -M * 11.0 -M * Sylvan Lake 8420 18.4 19.3 95 27.0 25.3 107 Sylvan Road 7120 .1 4.6 2 18.9 18.7 101 Younts Peak 8350 12.5 15.7 80 16.8 17.8 94 ----- ----- Basin Index (%) 91 106 POWDER RIVER Bear Trap Meadow 8200 .7 .6 117 10.7 10.8 99 Cloud Peak Reservoir 9860 13.9 16.4 85 15.7 16.9 93 Grave Springs 8550 6.9 9.4 73 11.0 13.0 85 Hansen Sawmill 8360 3.0 1.8 167 10.7 11.0 97 Middle Powder 7760 9.7 11.4 85 12.9 14.3 90 Powder River Pass 9480 10.3 9.1 113 15.0 15.2 99 Soldier Park 8720 2.3 -M * 10.6 -M * ----- ----- Basin Index (%) 91 94 TONGUE RIVER Big Goose 7990 7.4 9.3 80 11.3 14.3 79 Bone Springs Div 9350 18.9 16.4 115 16.6 18.4 90 Burgess Junction 7880 11.1 11.8 94 13.6 15.0 91 Dome Lake 8880 12.0 11.3 106 12.0 16.6 72 Little Goose 8870 9.3 -M * -M -M * Sucker Creek 8880 11.3 12.0 94 15.2 17.6 86 Tie Creek 6870 1.6 2.5 64 14.2 14.6 97 ----- ----- Basin Index (%) 98 86 BELLE FOURCHE Blind Park 6890 -M .2 * 10.0 14.6 68 Cole Canyon 5910 -M .1 * -M 12.3 * ----- ----- Basin Index (%) * 68 CHEYENNE RIVER BASIN Blind Park 6890 -M .2 * 10.0 14.6 68 North Rapid Creek 6130 .0 .5 0* 9.7 12.6 77 ----- ----- Basin Index (%) 0* 72 UPPER N. PLATTE Arapaho Ridge 10960 22.8 22.3 102 25.5 26.4 97 Blackhall Mtn 9820 29.1 -M * 33.0 -M * Columbine 9160 21.2 17.5 121 33.3 28.8 116 Divide Peak 8880 13.6 17.8 76 24.2 24.6 98 Joe Wright 10120 23.2 22.9 101 31.1 30.2 103 Laprele Creek 8375 6.1 5.6 109 14.5 15.2 95 Med Bow 10500 42.2 -M * 40.1 -M * Never Summer 10280 22.1 21.8 101 18.5 -M * North French Creek 10130 34.5 32.8 105 36.3 31.1 117 Old Battle 10000 33.5 34.7 97 33.3 39.5 84 Rawah 9020 7.0 5.2 135 16.9 17.5 97 Sage Creek Basin 7850 1.8 1.0 180* 13.9 16.3 85 Sand Lake 10050 32.8 31.5 104 31.2 29.3 106 South Brush Creek 8440 4.3 8.4 51 15.0 18.1 83 Tower 10500 46.9 50.4 93 48.0 45.1 106 Webber Springs 9250 18.5 21.3 87 28.8 30.2 95 Whiskey Park 8950 26.0 26.8 97 34.8 31.8 109 Willow Creek Pass 9540 14.3 14.5 99 15.7 16.0 98 Zirkel 9340 19.2 20.8 92 35.2 31.2 113 ----- ----- Basin Index (%) 98 101 SWEETWATER Deer Park 9700 11.2 15.7 71 16.2 23.6 69 Larsen Creek 9000 .0 8.6 0 10.9 -M * South Pass 9040 9.7 14.4 67 13.5 20.5 66 ----- ----- Basin Index (%) 54 67 LOWER N. PLATTE Casper Mtn. 7900 12.0 12.8 94 13.6 18.3 74 Laprele Creek 8375 6.1 5.6 109 14.5 15.2 95 Reno Hill 8400 15.2 12.2 125 19.9 19.2 104 Windy Peak 7900 3.2 3.4 94 11.2 13.2 85 ----- ----- Basin Index (%) 107 90 LARAMIE RIVER Brooklyn Lake 10240 27.4 23.1 119 31.0 25.0 124 Cinnabar Park 9574 20.8 19.0 109 29.5 27.3 108 Crow Creek 8330 .0 .0 * 14.0 13.6 103 Deadman Hill 10220 18.9 19.2 98 19.8 20.9 95 Rawah 9020 7.0 5.2 135 16.9 17.5 97 Roach 9700 12.4 17.1 73 19.1 22.5 85 Windy Peak 7900 3.2 3.4 94 11.2 13.2 85 ----- ----- Basin Index (%) 103 101 S. PLATTE Black Mountain 8920 6.7 -M * 16.6 -M * Crow Creek 8330 .0 .0 * 14.0 13.6 103 Deadman Hill 10220 18.9 19.2 98 19.8 20.9 95 ----- ----- Basin Index (%) 98* 98 LITTLE SNAKE RIVER Battle Mountain 7440 .0 .0 * 15.6 17.3 90 Divide Peak 8880 13.6 17.8 76 24.2 24.6 98 Elk River 8700 11.0 12.5 88 20.0 23.0 87 Little Snake River 8915 21.5 21.8 99 36.0 33.1 109 Old Battle 10000 33.5 34.7 97 33.3 39.5 84 Sage Creek Basin 7850 1.8 1.0 180* 13.9 16.3 85 Sandstone RS 8150 5.9 5.1 116 17.7 21.0 84 Whiskey Park 8950 26.0 26.8 97 34.8 31.8 109 ----- ----- Basin Index (%) 95 95 UPPER GREEN RIVER Big Sandy Opening 9080 7.1 9.8 72 10.3 15.3 67 Blind Bull Sum 8650 28.1 22.9 123 18.1 21.5 84 East Rim Divide 7930 2.3 7.9 29 11.8 13.0 91 Elkhart Park G.S. 9400 8.4 10.8 78 11.9 15.2 78 Gros Ventre Summit 8750 12.9 11.3 114 15.2 14.7 103 Gunsight Pass 9820 14.0 12.1 116 16.0 16.2 99 Indian Creek 9425 19.6 22.5 87 18.2 25.2 72 Kendall R.S. 7740 5.1 3.2 159 13.8 15.6 88 Loomis Park 8240 11.0 10.5 105 21.4 19.1 112 New Fork Lake 8340 4.9 6.0 82 -M 12.3 * Pocket Creek 9360 -M -M * 9.7 -M * Snider Basin 8060 3.2 8.9 36 15.3 15.7 97 Spring Creek Divide 9000 26.3 24.3 108 27.3 26.4 103 Triple Peak 8500 22.3 16.7 134 30.3 28.1 108 ----- ----- Basin Index (%) 99 93 LOWER GREEN RIVER Blacks Fork Jct 8869 1.5 -M * 13.6 -M * Buck Pasture 9632 12.1 -M * 19.5 -M * EF Blacks Fork GS 9360 7.7 -M * 13.8 -M * Hams Fork 7840 .3 2.0 15 13.2 13.2 100 Hewinta 9500 4.4 4.4 100 16.4 16.4 100 Hickerson Park 9122 2.4 3.5 69 12.4 12.2 102 Hole-in-Rock 9168 2.2 2.0 110 12.7 11.6 109 Indian Creek 9425 19.6 22.5 87 18.2 25.2 72 Kelley R.S. 8180 9.0 10.8 83 17.8 20.3 88 Spirit Lk 10235 13.4 -M * 19.4 -M * Steel Creek Park 10158 15.8 17.4 91 20.1 19.3 104 ----- ----- Basin Index (%) 86 94 UPPER BEAR RIVER Bear River RS 8777 .0 -M * 12.7 -M * Bug Lake 7987 12.0 14.2 85 19.9 21.8 91 Burts Miller Ranch 8000 .0 -M * 7.8 -M * Chalk Creek #1 9171 15.0 23.8 63 21.1 28.7 74 Hayden Fork 9130 6.3 8.8 72 22.5 24.0 94 Kelley R.S. 8180 9.0 10.8 83 17.8 20.3 88 Lily Lake 9133 6.1 9.9 62 14.2 19.8 72 Monte Cristo 8932 22.1 25.8 86 28.0 29.5 95 Salt River Summit 7640 7.5 7.6 99 17.6 18.5 95 Spring Creek Divide 9000 26.3 24.3 108 27.3 26.4 103 ----- ----- Basin Index (%) 83 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.