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 WEDNESDAY: APRIL 22 , 2020 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 15.5 11.5 135 20.1 21.9 92 Black Bear 8170 -M 36.9 * 33.9 40.2 84 Blind Bull Sum 8650 28.7 24.2 119 17.3 20.4 85 Cottonwood Creek 7670 25.1 18.1 139 31.1 26.1 119 East Rim Divide 7930 10.5 9.4 112 11.3 12.3 92 Grand Targhee 9260 46.2 42.5 109 -M 32.9 * Granite Creek 6770 18.3 10.3 178 18.1 20.4 89 Grassy Lake 7265 33.5 30.8 109 35.4 37.7 94 Gros Ventre Summit 8750 13.3 13.0 102 14.0 13.8 101 Gunsight Pass 9820 14.3 13.7 104 14.6 15.0 97 Lewis Lake Divide 7850 28.6 30.6 93 33.2 37.1 89 Phillips Bench 8200 -M 25.3 * -M 29.4 * Salt River Summit 7640 14.6 9.2 159 17.1 17.5 98 Snake River Station 6920 15.8 11.1 142 22.8 23.7 96 Spring Creek Divide 9000 28.2 23.6 119 26.5 25.0 106 Thumb Divide 7980 17.4 14.4 121 17.9 19.8 90 Togwotee Pass 9580 29.4 24.2 121 29.0 25.9 112 Two Ocean Plateau 9240 34.1 28.5 120 27.8 28.8 97 Willow Creek 8080 39.9 26.6 150 38.5 35.6 108 Younts Peak 8350 18.4 15.2 121 15.8 16.8 94 ----- ----- Basin Index (%) 121 97 MADISON-GALLATIN Black Bear 8170 -M 36.9 * 33.9 40.2 84 Canyon 7870 15.1 12.1 125 16.1 17.2 94 Madison Plateau 7750 22.7 22.9 99 20.6 27.7 74 West Yellowstone 6700 7.0 6.5 108 9.6 15.2 63 Whiskey Creek 6800 15.8 15.4 103 18.4 21.4 86 ----- ----- Basin Index (%) 107 81 YELLOWSTONE Beartooth Lake 9360 25.0 23.6 106 23.5 20.9 112 Burnt Mtn 5880 8.6 .0 * 16.5 14.5 114 Canyon 7870 15.1 12.1 125 16.1 17.2 94 Cole Creek 7850 20.5 16.4 125 15.9 14.8 107 Evening Star 9200 29.3 24.6 119 32.3 29.0 111 Fisher Creek 9100 35.1 32.8 107 35.5 33.7 105 Northeast Entrance 7350 9.2 6.0 153 13.4 13.1 102 Parker Peak 9400 29.2 21.2 138 25.7 18.9 136 Sylvan Lake 8420 22.5 20.4 110 25.7 23.8 108 Thumb Divide 7980 17.4 14.4 121 17.9 19.8 90 Two Ocean Plateau 9240 34.1 28.5 120 27.8 28.8 97 White Mill 8700 28.1 23.7 119 23.6 25.1 94 Wolverine 7650 12.7 6.6 192 14.2 13.0 109 Younts Peak 8350 18.4 15.2 121 15.8 16.8 94 ----- ----- Basin Index (%) 124 105 WIND RIVER Burroughs Creek 8750 14.3 -M * 15.1 -M * Castle Creek 8400 4.6 -M * 8.1 -M * Cold Springs 9630 7.8 4.1 190 9.1 11.1 82 Deer Park 9700 15.2 16.3 93 15.9 21.8 73 Hobbs Park 10100 15.5 15.1 103 14.5 15.1 96 Kirwin 9550 12.9 10.0 129 12.2 12.7 96 Little Warm 9370 12.9 10.0 129 11.3 14.0 81 Owl Creek 8975 6.2 3.5 177 8.6 7.0 123 South Pass 9040 13.2 15.4 86 13.4 18.8 71 St. Lawrence Alt 8620 5.1 5.1 100 9.1 10.1 90 Togwotee Pass 9580 29.4 24.2 121 29.0 25.9 112 Townsend Creek 8700 11.1 9.1 122 12.4 13.5 92 ----- ----- Basin Index (%) 115 90 BIGHORN BASIN Bald Mtn. 9380 22.7 20.0 114 18.1 18.4 98 Bear Trap Meadow 8200 7.8 2.7 289 10.5 9.6 109 Bone Springs Div 9350 18.2 16.2 112 16.2 17.0 95 Grave Springs 8550 10.0 9.4 106 10.9 11.9 92 Kirwin 9550 12.9 10.0 129 12.2 12.7 96 Marquette 8760 9.4 -M * 10.7 -M * Middle Powder 7760 13.0 12.4 105 12.6 13.0 97 Owl Creek 8975 6.2 3.5 177 8.6 7.0 123 Powder River Pass 9480 12.5 10.2 123 14.2 13.9 102 Shell Creek 9580 16.5 15.6 106 15.4 15.0 103 Timber Creek 7950 5.5 4.4 125 8.4 8.6 98 ----- ----- Basin Index (%) 120 100 SHOSHONE RIVER Blackwater 9780 25.4 24.0 106 25.5 22.0 116 Evening Star 9200 29.3 24.6 119 32.3 29.0 111 Marquette 8760 9.4 -M * 10.7 -M * Sylvan Lake 8420 22.5 20.4 110 25.7 23.8 108 Sylvan Road 7120 8.6 9.2 93 17.8 17.8 100 Younts Peak 8350 18.4 15.2 121 15.8 16.8 94 ----- ----- Basin Index (%) 112 107 POWDER RIVER Bear Trap Meadow 8200 7.8 2.7 289 10.5 9.6 109 Cloud Peak Reservoir 9860 15.7 16.0 98 15.2 15.2 100 Grave Springs 8550 10.0 9.4 106 10.9 11.9 92 Hansen Sawmill 8360 7.9 4.5 176 10.2 9.8 104 Middle Powder 7760 13.0 12.4 105 12.6 13.0 97 Powder River Pass 9480 12.5 10.2 123 14.2 13.9 102 Soldier Park 8720 7.5 -M * 10.2 -M * ----- ----- Basin Index (%) 121 100 TONGUE RIVER Big Goose 7990 10.0 9.2 109 11.0 12.9 85 Bone Springs Div 9350 18.2 16.2 112 16.2 17.0 95 Burgess Junction 7880 12.5 12.7 98 13.6 13.7 99 Dome Lake 8880 14.4 11.8 122 11.4 15.1 75 Little Goose 8870 12.3 -M * -M -M * Sucker Creek 8880 14.5 12.7 114 14.8 16.0 92 Tie Creek 6870 7.6 4.1 185 14.0 13.1 107 ----- ----- Basin Index (%) 116 92 BELLE FOURCHE Blind Park 6890 3.8 3.9 97 9.3 13.3 70 Cole Canyon 5910 -M 1.6 * -M 10.6 * ----- ----- Basin Index (%) 97 70 CHEYENNE RIVER BASIN Blind Park 6890 3.8 3.9 97 9.3 13.3 70 North Rapid Creek 6130 5.5 3.9 141 9.2 11.3 81 ----- ----- Basin Index (%) 119 75 UPPER N. PLATTE Arapaho Ridge 10960 24.0 21.4 112 24.0 24.5 98 Blackhall Mtn 9820 33.0 -M * 31.8 -M * Columbine 9160 28.6 20.6 139 30.9 27.2 114 Divide Peak 8880 22.6 18.4 123 23.3 23.0 101 Joe Wright 10120 24.0 22.5 107 29.5 28.1 105 Laprele Creek 8375 11.4 7.7 148 13.9 13.9 100 Med Bow 10500 46.1 -M * 38.4 -M * Never Summer 10280 21.8 20.8 105 16.8 -M * North French Creek 10130 35.9 32.1 112 34.6 28.9 120 Old Battle 10000 34.2 33.2 103 32.6 37.4 87 Rawah 9020 10.8 8.2 132 16.1 15.7 103 Sage Creek Basin 7850 12.5 4.9 255 13.3 15.3 87 Sand Lake 10050 32.2 30.6 105 29.4 27.1 108 South Brush Creek 8440 11.5 9.7 119 14.3 16.7 86 Tower 10500 46.4 48.5 96 45.6 42.5 107 Webber Springs 9250 23.3 21.8 107 27.6 28.6 97 Whiskey Park 8950 34.2 25.7 133 33.7 29.9 113 Willow Creek Pass 9540 15.3 13.4 114 14.6 14.6 100 Zirkel 9340 -M 22.6 * -M 29.9 * ----- ----- Basin Index (%) 114 103 SWEETWATER Deer Park 9700 15.2 16.3 93 15.9 21.8 73 Larsen Creek 9000 5.4 10.1 53 10.6 -M * South Pass 9040 13.2 15.4 86 13.4 18.8 71 ----- ----- Basin Index (%) 81 72 LOWER N. PLATTE Casper Mtn. 7900 16.2 14.3 113 12.6 16.8 75 Laprele Creek 8375 11.4 7.7 148 13.9 13.9 100 Reno Hill 8400 18.1 14.0 129 18.8 17.4 108 Windy Peak 7900 9.5 6.4 148 9.9 11.8 84 ----- ----- Basin Index (%) 130 92 LARAMIE RIVER Brooklyn Lake 10240 30.2 22.4 135 29.6 23.1 128 Cinnabar Park 9574 24.7 19.9 124 28.6 25.7 111 Crow Creek 8330 7.3 .4 1825* 12.8 12.1 106 Deadman Hill 10220 21.5 17.4 124 19.3 19.2 101 Rawah 9020 10.8 8.2 132 16.1 15.7 103 Roach 9700 16.9 16.6 102 18.4 20.9 88 Windy Peak 7900 9.5 6.4 148 9.9 11.8 84 ----- ----- Basin Index (%) 132 105 S. PLATTE Black Mountain 8920 11.7 -M * 15.9 -M * Crow Creek 8330 7.3 .4 1825* 12.8 12.1 106 Deadman Hill 10220 21.5 17.4 124 19.3 19.2 101 ----- ----- Basin Index (%) 162* 103 LITTLE SNAKE RIVER Battle Mountain 7440 8.2 3.5 234 15.2 16.2 94 Divide Peak 8880 22.6 18.4 123 23.3 23.0 101 Elk River 8700 19.9 15.0 133 19.5 21.5 91 Little Snake River 8915 28.3 23.8 119 34.7 31.2 111 Old Battle 10000 34.2 33.2 103 32.6 37.4 87 Sage Creek Basin 7850 12.5 4.9 255 13.3 15.3 87 Sandstone RS 8150 14.3 9.8 146 17.5 19.7 89 Whiskey Park 8950 34.2 25.7 133 33.7 29.9 113 ----- ----- Basin Index (%) 130 98 UPPER GREEN RIVER Big Sandy Opening 9080 10.9 12.4 88 10.0 14.3 70 Blind Bull Sum 8650 28.7 24.2 119 17.3 20.4 85 East Rim Divide 7930 10.5 9.4 112 11.3 12.3 92 Elkhart Park G.S. 9400 10.9 11.9 92 11.2 14.2 79 Gros Ventre Summit 8750 13.3 13.0 102 14.0 13.8 101 Gunsight Pass 9820 14.3 13.7 104 14.6 15.0 97 Indian Creek 9425 24.8 23.5 106 17.8 23.8 75 Kendall R.S. 7740 9.9 7.7 129 12.8 14.8 86 Loomis Park 8240 15.3 12.5 122 20.1 18.1 111 New Fork Lake 8340 9.6 8.3 116 10.0 11.4 88 Pocket Creek 9360 -M -M * 9.4 -M * Snider Basin 8060 11.0 10.5 105 15.0 14.9 101 Spring Creek Divide 9000 28.2 23.6 119 26.5 25.0 106 Triple Peak 8500 29.3 19.2 153 28.5 26.6 107 ----- ----- Basin Index (%) 114 93 LOWER GREEN RIVER Blacks Fork Jct 8869 8.1 -M * 13.3 -M * Buck Pasture 9632 18.4 -M * 19.1 -M * EF Blacks Fork GS 9360 14.4 -M * 13.4 -M * Hams Fork 7840 9.0 6.0 150 12.3 12.2 101 Hewinta 9500 13.4 7.6 176 16.1 15.2 106 Hickerson Park 9122 9.8 5.2 188 12.4 11.2 111 Hole-in-Rock 9168 10.2 5.6 182 12.4 10.7 116 Indian Creek 9425 24.8 23.5 106 17.8 23.8 75 Kelley R.S. 8180 15.5 12.2 127 17.3 19.1 91 Spirit Lk 10235 17.7 -M * 19.3 -M * Steel Creek Park 10158 18.8 16.3 115 19.9 18.0 111 ----- ----- Basin Index (%) 133 98 UPPER BEAR RIVER Bear River RS 8777 7.2 -M * 12.6 -M * Bug Lake 7987 18.9 16.6 114 19.6 20.6 95 Burts Miller Ranch 8000 .3 -M * 7.8 -M * Chalk Creek #1 9171 21.7 24.5 89 20.7 27.1 76 Hayden Fork 9130 15.8 11.2 141 22.2 22.6 98 Kelley R.S. 8180 15.5 12.2 127 17.3 19.1 91 Lily Lake 9133 12.4 10.2 122 14.0 18.5 76 Monte Cristo 8932 29.6 27.3 108 27.5 27.7 99 Salt River Summit 7640 14.6 9.2 159 17.1 17.5 98 Spring Creek Divide 9000 28.2 23.6 119 26.5 25.0 106 ----- ----- Basin Index (%) 116 93 ----------------------------------------------------------------------------- -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.