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: APRIL 27 , 2020 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 14.9 10.4 143 20.7 22.3 93 Black Bear 8170 -M 37.0 * 34.1 41.1 83 Blind Bull Sum 8650 29.9 24.1 124 17.8 20.8 86 Cottonwood Creek 7670 25.0 16.7 150 32.2 26.8 120 East Rim Divide 7930 8.3 8.8 94 11.5 12.5 92 Grand Targhee 9260 47.5 43.6 109 33.9 33.6 101 Granite Creek 6770 16.8 9.0 187 19.0 20.8 91 Grassy Lake 7265 31.6 30.0 105 36.0 38.5 94 Gros Ventre Summit 8750 14.3 12.1 118 15.0 14.2 106 Gunsight Pass 9820 15.3 13.3 115 15.8 15.5 102 Lewis Lake Divide 7850 28.0 30.7 91 33.7 37.8 89 Phillips Bench 8200 -M 25.6 * -M 30.0 * Salt River Summit 7640 12.4 8.2 151 17.5 18.0 97 Snake River Station 6920 14.8 9.4 157 23.3 24.2 96 Spring Creek Divide 9000 29.0 24.0 121 26.9 25.6 105 Thumb Divide 7980 15.7 13.9 113 18.2 20.4 89 Togwotee Pass 9580 29.8 24.6 121 29.8 26.6 112 Two Ocean Plateau 9240 35.0 29.3 119 28.4 29.5 96 Willow Creek 8080 39.4 24.9 158 40.1 36.7 109 Younts Peak 8350 17.9 15.1 119 16.0 17.2 93 ----- ----- Basin Index (%) 122 97 MADISON-GALLATIN Black Bear 8170 -M 37.0 * 34.1 41.1 83 Canyon 7870 14.2 11.5 123 16.2 17.6 92 Madison Plateau 7750 20.8 22.2 94 20.8 28.3 73 West Yellowstone 6700 3.7 4.2 88 9.6 15.6 62 Whiskey Creek 6800 14.4 15.4 94 18.5 21.9 84 ----- ----- Basin Index (%) 100 80 YELLOWSTONE Beartooth Lake 9360 24.7 23.4 106 23.6 21.4 110 Burnt Mtn 5880 5.6 .0 * 16.1 15.0 107 Canyon 7870 14.2 11.5 123 16.2 17.6 92 Cole Creek 7850 20.0 16.3 123 16.0 15.7 102 Evening Star 9200 29.2 24.6 119 32.5 29.7 109 Fisher Creek 9100 35.1 33.2 106 35.9 34.4 104 Northeast Entrance 7350 7.1 4.6 154 13.6 13.4 101 Parker Peak 9400 29.3 21.8 134 25.9 19.6 132 Sylvan Lake 8420 21.4 20.3 105 26.1 24.5 107 Thumb Divide 7980 15.7 13.9 113 18.2 20.4 89 Two Ocean Plateau 9240 35.0 29.3 119 28.4 29.5 96 White Mill 8700 28.5 23.7 120 23.7 25.7 92 Wolverine 7650 10.1 4.8 210 14.4 13.4 107 Younts Peak 8350 17.9 15.1 119 16.0 17.2 93 ----- ----- Basin Index (%) 121 103 WIND RIVER Burroughs Creek 8750 12.8 -M * 15.4 -M * Castle Creek 8400 2.6 -M * 8.2 -M * Cold Springs 9630 6.2 2.4 258 9.2 11.9 77 Deer Park 9700 14.3 16.3 88 16.1 22.9 70 Hobbs Park 10100 15.0 15.8 95 14.5 16.2 90 Kirwin 9550 12.9 10.2 126 12.3 13.3 92 Little Warm 9370 13.0 9.2 141 11.8 14.7 80 Owl Creek 8975 3.7 2.0 185 8.6 7.5 115 South Pass 9040 12.2 15.2 80 13.5 19.8 68 St. Lawrence Alt 8620 3.2 4.2 76 9.2 11.0 84 Togwotee Pass 9580 29.8 24.6 121 29.8 26.6 112 Townsend Creek 8700 10.7 8.4 127 12.5 14.5 86 ----- ----- Basin Index (%) 112 87 BIGHORN BASIN Bald Mtn. 9380 22.8 20.6 111 18.4 19.1 96 Bear Trap Meadow 8200 5.9 1.6 369 10.6 10.1 105 Bone Springs Div 9350 18.6 16.5 113 16.3 17.6 93 Grave Springs 8550 9.5 9.1 104 11.0 12.3 89 Kirwin 9550 12.9 10.2 126 12.3 13.3 92 Marquette 8760 9.0 -M * 10.9 -M * Middle Powder 7760 12.6 12.2 103 12.8 13.7 93 Owl Creek 8975 3.7 2.0 185 8.6 7.5 115 Powder River Pass 9480 12.0 10.0 120 14.3 14.5 99 Shell Creek 9580 16.3 15.9 103 15.6 15.7 99 Timber Creek 7950 3.1 3.6 86 8.4 9.3 90 ----- ----- Basin Index (%) 115 96 SHOSHONE RIVER Blackwater 9780 25.9 24.7 105 26.0 22.8 114 Evening Star 9200 29.2 24.6 119 32.5 29.7 109 Marquette 8760 9.0 -M * 10.9 -M * Sylvan Lake 8420 21.4 20.3 105 26.1 24.5 107 Sylvan Road 7120 5.5 7.5 73 18.2 18.1 101 Younts Peak 8350 17.9 15.1 119 16.0 17.2 93 ----- ----- Basin Index (%) 108 106 POWDER RIVER Bear Trap Meadow 8200 5.9 1.6 369 10.6 10.1 105 Cloud Peak Reservoir 9860 15.4 16.5 93 15.3 16.0 96 Grave Springs 8550 9.5 9.1 104 11.0 12.3 89 Hansen Sawmill 8360 6.5 3.8 171 10.2 10.3 99 Middle Powder 7760 12.6 12.2 103 12.8 13.7 93 Powder River Pass 9480 12.0 10.0 120 14.3 14.5 99 Soldier Park 8720 6.2 -M * 10.3 -M * ----- ----- Basin Index (%) 116 96 TONGUE RIVER Big Goose 7990 9.6 9.1 105 11.1 13.5 82 Bone Springs Div 9350 18.6 16.5 113 16.3 17.6 93 Burgess Junction 7880 12.6 12.3 102 13.7 14.3 96 Dome Lake 8880 13.5 11.7 115 11.5 15.9 72 Little Goose 8870 11.9 -M * -M -M * Sucker Creek 8880 14.1 12.5 113 15.1 16.7 90 Tie Creek 6870 6.0 3.0 200 14.2 13.7 104 ----- ----- Basin Index (%) 114 89 BELLE FOURCHE Blind Park 6890 1.3 2.7 48 9.3 13.8 67 Cole Canyon 5910 -M .4 * -M 11.2 * ----- ----- Basin Index (%) 48 67 CHEYENNE RIVER BASIN Blind Park 6890 1.3 2.7 48 9.3 13.8 67 North Rapid Creek 6130 3.2 2.7 119 9.3 11.8 79 ----- ----- Basin Index (%) 83 73 UPPER N. PLATTE Arapaho Ridge 10960 25.4 22.1 115 25.5 25.7 99 Blackhall Mtn 9820 33.3 -M * 32.6 -M * Columbine 9160 28.2 19.9 142 32.9 27.9 118 Divide Peak 8880 20.5 17.9 115 24.1 23.8 101 Joe Wright 10120 25.3 23.4 108 30.9 29.2 106 Laprele Creek 8375 10.0 7.1 141 14.3 14.6 98 Med Bow 10500 46.6 -M * 39.1 -M * Never Summer 10280 23.4 21.4 109 18.5 -M * North French Creek 10130 36.6 32.9 111 35.8 30.0 119 Old Battle 10000 35.3 34.4 103 33.2 38.4 86 Rawah 9020 10.9 7.8 140 16.7 16.8 99 Sage Creek Basin 7850 9.4 1.7 553 13.6 15.8 86 Sand Lake 10050 33.8 31.2 108 30.6 28.4 108 South Brush Creek 8440 10.0 10.0 100 14.6 17.4 84 Tower 10500 44.0 49.7 89 47.1 43.8 108 Webber Springs 9250 22.6 22.0 103 28.2 29.4 96 Whiskey Park 8950 33.5 25.7 130 34.4 30.8 112 Willow Creek Pass 9540 16.5 13.8 120 15.6 15.3 102 Zirkel 9340 -M 21.9 * -M 30.5 * ----- ----- Basin Index (%) 113 103 SWEETWATER Deer Park 9700 14.3 16.3 88 16.1 22.9 70 Larsen Creek 9000 2.4 9.6 25 10.9 -M * South Pass 9040 12.2 15.2 80 13.5 19.8 68 ----- ----- Basin Index (%) 70 69 LOWER N. PLATTE Casper Mtn. 7900 15.8 14.1 112 13.5 17.5 77 Laprele Creek 8375 10.0 7.1 141 14.3 14.6 98 Reno Hill 8400 18.1 13.6 133 19.8 18.3 108 Windy Peak 7900 8.0 5.5 145 10.4 12.6 83 ----- ----- Basin Index (%) 129 92 LARAMIE RIVER Brooklyn Lake 10240 30.5 23.0 133 30.4 24.1 126 Cinnabar Park 9574 24.3 20.1 121 29.0 26.4 110 Crow Creek 8330 5.4 .0 * 13.3 13.0 102 Deadman Hill 10220 22.2 18.5 120 19.7 20.1 98 Rawah 9020 10.9 7.8 140 16.7 16.8 99 Roach 9700 16.4 17.0 96 18.8 21.7 87 Windy Peak 7900 8.0 5.5 145 10.4 12.6 83 ----- ----- Basin Index (%) 128 103 S. PLATTE Black Mountain 8920 10.5 -M * 16.3 -M * Crow Creek 8330 5.4 .0 * 13.3 13.0 102 Deadman Hill 10220 22.2 18.5 120 19.7 20.1 98 ----- ----- Basin Index (%) 149* 100 LITTLE SNAKE RIVER Battle Mountain 7440 5.2 1.0 520* 15.4 16.8 92 Divide Peak 8880 20.5 17.9 115 24.1 23.8 101 Elk River 8700 16.9 14.3 118 19.8 22.2 89 Little Snake River 8915 27.5 23.1 119 35.6 32.0 111 Old Battle 10000 35.3 34.4 103 33.2 38.4 86 Sage Creek Basin 7850 9.4 1.7 553 13.6 15.8 86 Sandstone RS 8150 11.8 7.7 153 17.5 20.3 86 Whiskey Park 8950 33.5 25.7 130 34.4 30.8 112 ----- ----- Basin Index (%) 127 97 UPPER GREEN RIVER Big Sandy Opening 9080 10.3 11.8 87 10.3 14.8 70 Blind Bull Sum 8650 29.9 24.1 124 17.8 20.8 86 East Rim Divide 7930 8.3 8.8 94 11.5 12.5 92 Elkhart Park G.S. 9400 10.9 11.8 92 11.7 14.6 80 Gros Ventre Summit 8750 14.3 12.1 118 15.0 14.2 106 Gunsight Pass 9820 15.3 13.3 115 15.8 15.5 102 Indian Creek 9425 23.5 23.8 99 18.1 24.4 74 Kendall R.S. 7740 8.8 5.9 149 13.6 15.1 90 Loomis Park 8240 14.5 11.5 126 20.9 18.5 113 New Fork Lake 8340 8.6 7.1 121 10.5 11.7 90 Pocket Creek 9360 -M -M * 9.6 -M * Snider Basin 8060 8.0 10.0 80 15.1 15.2 99 Spring Creek Divide 9000 29.0 24.0 121 26.9 25.6 105 Triple Peak 8500 28.0 18.8 149 29.6 27.3 108 ----- ----- Basin Index (%) 114 94 LOWER GREEN RIVER Blacks Fork Jct 8869 5.7 -M * 13.4 -M * Buck Pasture 9632 16.6 -M * 19.2 -M * EF Blacks Fork GS 9360 12.0 -M * 13.5 -M * Hams Fork 7840 6.3 4.4 143 12.7 12.7 100 Hewinta 9500 9.1 6.1 149 16.3 15.7 104 Hickerson Park 9122 7.3 5.0 146 12.4 11.7 106 Hole-in-Rock 9168 7.2 4.2 171 12.5 11.2 112 Indian Creek 9425 23.5 23.8 99 18.1 24.4 74 Kelley R.S. 8180 13.0 11.8 110 17.6 19.7 89 Spirit Lk 10235 16.8 -M * 19.3 -M * Steel Creek Park 10158 18.4 16.7 110 20.1 18.6 108 ----- ----- Basin Index (%) 118 96 UPPER BEAR RIVER Bear River RS 8777 3.8 -M * 12.7 -M * Bug Lake 7987 16.8 16.1 104 19.8 21.1 94 Burts Miller Ranch 8000 .0 -M * 7.8 -M * Chalk Creek #1 9171 19.7 24.7 80 21.0 27.8 76 Hayden Fork 9130 11.9 10.1 118 22.4 23.2 97 Kelley R.S. 8180 13.0 11.8 110 17.6 19.7 89 Lily Lake 9133 10.8 9.7 111 14.1 19.0 74 Monte Cristo 8932 28.0 27.3 103 28.0 28.5 98 Salt River Summit 7640 12.4 8.2 151 17.5 18.0 97 Spring Creek Divide 9000 29.0 24.0 121 26.9 25.6 105 ----- ----- Basin Index (%) 107 91 ----------------------------------------------------------------------------- -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.