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: APRIL 18 , 2020 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 17.6 12.2 144 20.1 21.6 93 Black Bear 8170 -M 36.8 * 33.8 39.5 86 Blind Bull Sum 8650 28.2 23.9 118 17.2 20.1 86 Cottonwood Creek 7670 26.4 19.1 138 30.9 25.5 121 East Rim Divide 7930 12.1 9.6 126 11.2 12.1 93 Grand Targhee 9260 45.6 41.7 109 29.5 32.3 91 Granite Creek 6770 18.9 11.4 166 -M 20.2 * Grassy Lake 7265 34.7 31.5 110 35.5 37.1 96 Gros Ventre Summit 8750 13.7 13.2 104 13.8 13.5 102 Gunsight Pass 9820 14.7 13.5 109 14.6 14.6 100 Lewis Lake Divide 7850 29.5 30.2 98 33.2 36.5 91 Phillips Bench 8200 -M 25.8 * -M 28.9 * Salt River Summit 7640 15.6 10.3 151 17.0 17.2 99 Snake River Station 6920 18.4 11.7 157 22.8 23.3 98 Spring Creek Divide 9000 28.2 23.5 120 26.4 24.6 107 Thumb Divide 7980 18.4 14.5 127 17.9 19.5 92 Togwotee Pass 9580 29.5 23.5 126 29.0 25.4 114 Two Ocean Plateau 9240 33.9 27.8 122 27.8 28.2 99 Willow Creek 8080 40.6 26.8 151 38.5 34.9 110 Younts Peak 8350 18.9 15.0 126 15.5 16.4 95 ----- ----- Basin Index (%) 124 98 MADISON-GALLATIN Black Bear 8170 -M 36.8 * 33.8 39.5 86 Canyon 7870 15.6 12.4 126 16.1 16.8 96 Madison Plateau 7750 23.4 22.8 103 20.6 27.2 76 West Yellowstone 6700 9.4 8.0 118 9.6 14.9 64 Whiskey Creek 6800 16.2 15.1 107 18.4 21.0 88 ----- ----- Basin Index (%) 111 82 YELLOWSTONE Beartooth Lake 9360 25.0 23.0 109 23.4 20.5 114 Burnt Mtn 5880 9.6 .0 * 16.6 13.9 119 Canyon 7870 15.6 12.4 126 16.1 16.8 96 Cole Creek 7850 20.6 16.0 129 15.8 14.2 111 Evening Star 9200 29.8 25.0 119 32.2 28.4 113 Fisher Creek 9100 34.5 32.2 107 35.2 33.0 107 Northeast Entrance 7350 10.2 7.3 140 13.5 12.8 105 Parker Peak 9400 -M 20.8 * -M 18.5 * Sylvan Lake 8420 23.6 20.3 116 25.7 23.3 110 Thumb Divide 7980 18.4 14.5 127 17.9 19.5 92 Two Ocean Plateau 9240 33.9 27.8 122 27.8 28.2 99 White Mill 8700 28.1 23.6 119 23.4 24.7 95 Wolverine 7650 13.2 7.8 169 14.3 12.7 113 Younts Peak 8350 18.9 15.0 126 15.5 16.4 95 ----- ----- Basin Index (%) 125 105 WIND RIVER Burroughs Creek 8750 14.6 -M * 15.2 -M * Castle Creek 8400 6.1 -M * 8.0 -M * Cold Springs 9630 8.5 5.1 167 8.9 10.7 83 Deer Park 9700 16.0 16.1 99 15.8 21.1 75 Hobbs Park 10100 15.9 14.8 107 14.5 14.5 100 Kirwin 9550 12.7 10.0 127 12.1 12.2 99 Little Warm 9370 13.4 10.2 131 10.9 13.7 80 Owl Creek 8975 7.3 4.4 166 8.5 6.6 129 South Pass 9040 13.7 15.7 87 13.3 18.3 73 St. Lawrence Alt 8620 6.0 5.7 105 9.1 9.7 94 Togwotee Pass 9580 29.5 23.5 126 29.0 25.4 114 Townsend Creek 8700 11.4 9.7 118 12.4 13.0 95 ----- ----- Basin Index (%) 117 93 BIGHORN BASIN Bald Mtn. 9380 21.9 19.6 112 17.2 17.9 96 Bear Trap Meadow 8200 8.6 3.8 226 10.3 9.2 112 Bone Springs Div 9350 19.2 16.3 118 15.7 16.5 95 Grave Springs 8550 10.1 9.7 104 11.0 11.3 97 Kirwin 9550 12.7 10.0 127 12.1 12.2 99 Marquette 8760 9.4 -M * 10.7 -M * Middle Powder 7760 13.4 12.5 107 12.7 12.5 102 Owl Creek 8975 7.3 4.4 166 8.5 6.6 129 Powder River Pass 9480 12.9 10.1 128 14.0 13.5 104 Shell Creek 9580 16.3 15.3 107 15.0 14.6 103 Timber Creek 7950 6.6 5.1 129 8.4 8.2 102 ----- ----- Basin Index (%) 121 102 SHOSHONE RIVER Blackwater 9780 25.2 23.8 106 25.3 21.6 117 Evening Star 9200 29.8 25.0 119 32.2 28.4 113 Marquette 8760 9.4 -M * 10.7 -M * Sylvan Lake 8420 23.6 20.3 116 25.7 23.3 110 Sylvan Road 7120 11.9 10.2 117 -M 17.4 * Younts Peak 8350 18.9 15.0 126 15.5 16.4 95 ----- ----- Basin Index (%) 116 110 POWDER RIVER Bear Trap Meadow 8200 8.6 3.8 226 10.3 9.2 112 Cloud Peak Reservoir 9860 15.9 15.6 102 15.1 14.5 104 Grave Springs 8550 10.1 9.7 104 11.0 11.3 97 Hansen Sawmill 8360 8.3 5.2 160 10.1 9.3 109 Middle Powder 7760 13.4 12.5 107 12.7 12.5 102 Powder River Pass 9480 12.9 10.1 128 14.0 13.5 104 Soldier Park 8720 8.1 -M * 10.0 -M * ----- ----- Basin Index (%) 122 104 TONGUE RIVER Big Goose 7990 9.7 9.5 102 10.9 12.3 89 Bone Springs Div 9350 19.2 16.3 118 15.7 16.5 95 Burgess Junction 7880 12.4 12.3 101 13.2 13.2 100 Dome Lake 8880 14.9 11.9 125 11.3 14.6 77 Little Goose 8870 12.4 -M * 9.4 -M * Sucker Creek 8880 14.4 12.7 113 14.2 15.5 92 Tie Creek 6870 8.3 4.5 184 13.9 12.6 110 ----- ----- Basin Index (%) 117 94 BELLE FOURCHE Blind Park 6890 4.0 4.4 91 9.0 12.6 71 Cole Canyon 5910 -M 2.4 * -M 10.1 * ----- ----- Basin Index (%) 91 71 CHEYENNE RIVER BASIN Blind Park 6890 4.0 4.4 91 9.0 12.6 71 North Rapid Creek 6130 6.3 4.6 137 9.0 10.5 86 ----- ----- Basin Index (%) 114 78 UPPER N. PLATTE Arapaho Ridge 10960 23.6 21.4 110 23.5 24.0 98 Blackhall Mtn 9820 32.9 -M * 31.6 -M * Columbine 9160 29.0 21.0 138 30.2 26.6 114 Divide Peak 8880 22.0 19.3 114 23.2 22.5 103 Joe Wright 10120 23.4 22.1 106 29.1 27.4 106 Laprele Creek 8375 12.3 8.6 143 13.8 13.4 103 Med Bow 10500 45.1 -M * 38.2 -M * Never Summer 10280 21.5 20.6 104 16.6 -M * North French Creek 10130 35.4 32.0 111 34.4 28.1 122 Old Battle 10000 34.3 32.4 106 32.3 36.6 88 Rawah 9020 11.2 8.9 126 15.9 15.5 103 Sage Creek Basin 7850 13.0 7.1 183 13.2 15.1 87 Sand Lake 10050 31.7 30.4 104 29.0 26.4 110 South Brush Creek 8440 11.8 10.1 117 14.3 16.2 88 Tower 10500 49.2 47.7 103 44.7 41.6 107 Webber Springs 9250 23.3 22.6 103 27.3 28.1 97 Whiskey Park 8950 34.4 26.2 131 33.6 29.3 115 Willow Creek Pass 9540 15.3 12.8 120 14.4 14.2 101 Zirkel 9340 -M 23.0 * -M 29.5 * ----- ----- Basin Index (%) 114 104 SWEETWATER Deer Park 9700 16.0 16.1 99 15.8 21.1 75 Larsen Creek 9000 7.2 10.5 69 10.5 -M * South Pass 9040 13.7 15.7 87 13.3 18.3 73 ----- ----- Basin Index (%) 87 74 LOWER N. PLATTE Casper Mtn. 7900 17.0 14.5 117 12.6 16.2 78 Laprele Creek 8375 12.3 8.6 143 13.8 13.4 103 Reno Hill 8400 18.1 14.0 129 18.6 16.8 111 Windy Peak 7900 10.0 6.9 145 9.7 11.4 85 ----- ----- Basin Index (%) 130 95 LARAMIE RIVER Brooklyn Lake 10240 30.1 22.1 136 29.3 22.4 131 Cinnabar Park 9574 25.3 20.5 123 28.4 25.2 113 Crow Creek 8330 8.4 1.7 494 12.7 11.9 107 Deadman Hill 10220 21.4 16.6 129 19.1 18.6 103 Rawah 9020 11.2 8.9 126 15.9 15.5 103 Roach 9700 17.0 16.5 103 18.1 20.3 89 Windy Peak 7900 10.0 6.9 145 9.7 11.4 85 ----- ----- Basin Index (%) 132 106 S. PLATTE Black Mountain 8920 13.0 -M * 15.7 -M * Crow Creek 8330 8.4 1.7 494 12.7 11.9 107 Deadman Hill 10220 21.4 16.6 129 19.1 18.6 103 ----- ----- Basin Index (%) 163 104 LITTLE SNAKE RIVER Battle Mountain 7440 9.4 5.4 174 15.0 15.8 95 Divide Peak 8880 22.0 19.3 114 23.2 22.5 103 Elk River 8700 20.7 16.1 129 19.4 21.0 92 Little Snake River 8915 28.9 25.0 116 34.5 31.0 111 Old Battle 10000 34.3 32.4 106 32.3 36.6 88 Sage Creek Basin 7850 13.0 7.1 183 13.2 15.1 87 Sandstone RS 8150 16.7 10.8 155 17.4 19.2 91 Whiskey Park 8950 34.4 26.2 131 33.6 29.3 115 ----- ----- Basin Index (%) 126 99 UPPER GREEN RIVER Big Sandy Opening 9080 11.2 12.7 88 9.9 13.9 71 Blind Bull Sum 8650 28.2 23.9 118 17.2 20.1 86 East Rim Divide 7930 12.1 9.6 126 11.2 12.1 93 Elkhart Park G.S. 9400 11.1 12.0 92 11.0 13.9 79 Gros Ventre Summit 8750 13.7 13.2 104 13.8 13.5 102 Gunsight Pass 9820 14.7 13.5 109 14.6 14.6 100 Indian Creek 9425 24.9 23.3 107 17.7 23.3 76 Kendall R.S. 7740 11.1 9.0 123 12.7 14.6 87 Loomis Park 8240 15.8 13.2 120 20.0 17.8 112 New Fork Lake 8340 11.1 9.2 121 -M 11.2 * Pocket Creek 9360 -M -M * 9.3 -M * Snider Basin 8060 13.1 11.1 118 14.8 14.6 101 Spring Creek Divide 9000 28.2 23.5 120 26.4 24.6 107 Triple Peak 8500 29.5 19.3 153 28.0 26.1 107 ----- ----- Basin Index (%) 116 94 LOWER GREEN RIVER Blacks Fork Jct 8869 8.4 -M * 13.2 -M * Buck Pasture 9632 19.2 -M * 19.0 -M * EF Blacks Fork GS 9360 15.2 -M * 13.2 -M * Hams Fork 7840 11.4 7.5 152 12.3 11.9 103 Hewinta 9500 13.4 8.7 154 16.1 14.8 109 Hickerson Park 9122 10.5 5.8 181 12.4 10.9 114 Hole-in-Rock 9168 10.6 6.2 171 12.3 10.4 118 Indian Creek 9425 24.9 23.3 107 17.7 23.3 76 Kelley R.S. 8180 15.8 13.1 121 17.1 18.7 91 Spirit Lk 10235 17.8 -M * 19.2 -M * Steel Creek Park 10158 18.8 16.1 117 19.7 17.5 113 ----- ----- Basin Index (%) 131 100 UPPER BEAR RIVER Bear River RS 8777 9.1 -M * 12.5 -M * Bug Lake 7987 19.2 18.0 107 19.5 20.1 97 Burts Miller Ranch 8000 2.7 -M * 7.7 -M * Chalk Creek #1 9171 21.9 24.8 88 20.7 26.4 78 Hayden Fork 9130 17.4 12.6 138 22.1 22.1 100 Kelley R.S. 8180 15.8 13.1 121 17.1 18.7 91 Lily Lake 9133 12.9 11.3 114 13.9 18.1 77 Monte Cristo 8932 30.0 27.6 109 27.5 27.0 102 Salt River Summit 7640 15.6 10.3 151 17.0 17.2 99 Spring Creek Divide 9000 28.2 23.5 120 26.4 24.6 107 ----- ----- Basin Index (%) 114 94 ----------------------------------------------------------------------------- -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.