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 FRIDAY: APRIL 17 , 2020 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 17.3 12.5 138 20.0 21.5 93 Black Bear 8170 -M 36.8 * -M 39.3 * Blind Bull Sum 8650 28.1 23.9 118 17.2 20.0 86 Cottonwood Creek 7670 26.6 19.3 138 30.9 25.3 122 East Rim Divide 7930 12.0 9.7 124 11.2 12.1 93 Grand Targhee 9260 45.5 41.5 110 29.3 32.3 91 Granite Creek 6770 18.7 11.7 160 -M 20.1 * Grassy Lake 7265 34.4 31.6 109 35.5 36.9 96 Gros Ventre Summit 8750 13.5 13.1 103 13.7 13.5 101 Gunsight Pass 9820 14.4 13.4 107 14.5 14.6 99 Lewis Lake Divide 7850 29.3 30.2 97 33.3 36.4 91 Phillips Bench 8200 -M 25.9 * -M 28.8 * Salt River Summit 7640 15.3 10.6 144 16.9 17.1 99 Snake River Station 6920 18.0 12.1 149 22.9 23.2 99 Spring Creek Divide 9000 28.2 23.4 121 26.3 24.4 108 Thumb Divide 7980 18.5 14.4 128 17.9 19.3 93 Togwotee Pass 9580 29.5 23.3 127 29.0 25.2 115 Two Ocean Plateau 9240 33.8 27.6 122 27.8 28.1 99 Willow Creek 8080 40.0 26.7 150 37.6 34.7 108 Younts Peak 8350 18.8 14.9 126 15.4 16.4 94 ----- ----- Basin Index (%) 123 100 MADISON-GALLATIN Black Bear 8170 -M 36.8 * -M 39.3 * Canyon 7870 15.6 12.4 126 16.0 16.8 95 Madison Plateau 7750 23.2 22.7 102 20.6 27.1 76 West Yellowstone 6700 9.6 8.1 119 9.6 14.7 65 Whiskey Creek 6800 16.2 14.9 109 18.3 20.9 88 ----- ----- Basin Index (%) 111 81 YELLOWSTONE Beartooth Lake 9360 24.9 22.8 109 23.2 20.4 114 Burnt Mtn 5880 9.7 .0 * 16.2 13.7 118 Canyon 7870 15.6 12.4 126 16.0 16.8 95 Cole Creek 7850 20.5 15.9 129 15.7 14.2 111 Evening Star 9200 29.7 25.0 119 32.1 28.3 113 Fisher Creek 9100 34.4 32.1 107 35.0 32.9 106 Northeast Entrance 7350 10.4 7.6 137 13.4 12.7 106 Parker Peak 9400 -M 20.7 * -M 18.4 * Sylvan Lake 8420 23.7 20.2 117 25.6 23.2 110 Thumb Divide 7980 18.5 14.4 128 17.9 19.3 93 Two Ocean Plateau 9240 33.8 27.6 122 27.8 28.1 99 White Mill 8700 28.1 23.6 119 23.3 24.6 95 Wolverine 7650 13.1 8.1 162 14.1 12.6 112 Younts Peak 8350 18.8 14.9 126 15.4 16.4 94 ----- ----- Basin Index (%) 125 105 WIND RIVER Burroughs Creek 8750 14.5 -M * 15.0 -M * Castle Creek 8400 6.0 -M * 7.9 -M * Cold Springs 9630 8.5 5.4 157 8.8 10.6 83 Deer Park 9700 16.1 16.0 101 15.5 21.0 74 Hobbs Park 10100 15.8 14.8 107 14.1 14.4 98 Kirwin 9550 12.6 10.0 126 11.9 12.2 98 Little Warm 9370 13.3 10.2 130 10.6 13.6 78 Owl Creek 8975 7.3 4.7 155 8.4 6.6 127 South Pass 9040 13.6 15.7 87 13.1 18.2 72 St. Lawrence Alt 8620 5.9 6.0 98 9.0 9.6 94 Togwotee Pass 9580 29.5 23.3 127 29.0 25.2 115 Townsend Creek 8700 11.3 9.8 115 12.1 12.9 94 ----- ----- Basin Index (%) 116 92 BIGHORN BASIN Bald Mtn. 9380 21.8 19.5 112 16.4 17.9 92 Bear Trap Meadow 8200 8.4 4.0 210 10.0 9.2 109 Bone Springs Div 9350 19.2 16.4 117 15.6 16.4 95 Grave Springs 8550 10.1 9.6 105 10.9 11.3 96 Kirwin 9550 12.6 10.0 126 11.9 12.2 98 Marquette 8760 9.2 -M * 10.6 -M * Middle Powder 7760 13.4 12.5 107 12.5 12.5 100 Owl Creek 8975 7.3 4.7 155 8.4 6.6 127 Powder River Pass 9480 12.9 10.1 128 13.8 13.4 103 Shell Creek 9580 16.2 15.3 106 14.9 14.5 103 Timber Creek 7950 6.8 5.1 133 8.4 8.1 104 ----- ----- Basin Index (%) 120 101 SHOSHONE RIVER Blackwater 9780 25.2 23.7 106 25.2 21.5 117 Evening Star 9200 29.7 25.0 119 32.1 28.3 113 Marquette 8760 9.2 -M * 10.6 -M * Sylvan Lake 8420 23.7 20.2 117 25.6 23.2 110 Sylvan Road 7120 12.1 10.2 119 -M 17.2 * Younts Peak 8350 18.8 14.9 126 15.4 16.4 94 ----- ----- Basin Index (%) 116 110 POWDER RIVER Bear Trap Meadow 8200 8.4 4.0 210 10.0 9.2 109 Cloud Peak Reservoir 9860 15.9 15.5 103 14.5 14.4 101 Grave Springs 8550 10.1 9.6 105 10.9 11.3 96 Hansen Sawmill 8360 8.2 5.4 152 10.0 9.3 108 Middle Powder 7760 13.4 12.5 107 12.5 12.5 100 Powder River Pass 9480 12.9 10.1 128 13.8 13.4 103 Soldier Park 8720 7.7 -M * 9.8 -M * ----- ----- Basin Index (%) 121 102 TONGUE RIVER Big Goose 7990 9.6 9.6 100 10.9 12.2 89 Bone Springs Div 9350 19.2 16.4 117 15.6 16.4 95 Burgess Junction 7880 12.3 12.2 101 13.1 13.1 100 Dome Lake 8880 14.8 11.9 124 11.0 14.5 76 Little Goose 8870 12.3 -M * 9.3 -M * Sucker Creek 8880 14.3 12.7 113 13.9 15.4 90 Tie Creek 6870 8.2 4.5 182 13.8 12.4 111 ----- ----- Basin Index (%) 116 93 BELLE FOURCHE Blind Park 6890 3.9 4.6 85 8.9 12.5 71 Cole Canyon 5910 -M 2.6 * -M 10.1 * ----- ----- Basin Index (%) 85 71 CHEYENNE RIVER BASIN Blind Park 6890 3.9 4.6 85 8.9 12.5 71 North Rapid Creek 6130 6.2 4.8 129 9.0 10.5 86 ----- ----- Basin Index (%) 107 78 UPPER N. PLATTE Arapaho Ridge 10960 23.6 21.5 110 23.5 23.9 98 Blackhall Mtn 9820 32.8 -M * 31.6 -M * Columbine 9160 28.5 21.2 134 30.3 26.6 114 Divide Peak 8880 21.6 19.6 110 23.0 22.4 103 Joe Wright 10120 23.2 22.1 105 29.1 27.2 107 Laprele Creek 8375 12.0 8.8 136 13.6 13.3 102 Med Bow 10500 45.2 -M * 38.2 -M * Never Summer 10280 21.6 20.6 105 16.6 -M * North French Creek 10130 35.2 32.0 110 34.4 28.0 123 Old Battle 10000 34.2 32.3 106 32.1 36.4 88 Rawah 9020 11.2 9.2 122 15.9 15.3 104 Sage Creek Basin 7850 12.5 7.6 164 13.2 15.0 88 Sand Lake 10050 31.5 30.4 104 28.7 26.2 110 South Brush Creek 8440 11.5 10.3 112 14.2 16.1 88 Tower 10500 49.1 47.5 103 44.5 41.4 107 Webber Springs 9250 23.2 22.8 102 27.1 27.9 97 Whiskey Park 8950 34.0 26.5 128 33.5 29.1 115 Willow Creek Pass 9540 15.2 12.7 120 14.3 14.1 101 Zirkel 9340 -M 23.2 * -M 29.5 * ----- ----- Basin Index (%) 112 104 SWEETWATER Deer Park 9700 16.1 16.0 101 15.5 21.0 74 Larsen Creek 9000 7.1 10.6 67 10.4 -M * South Pass 9040 13.6 15.7 87 13.1 18.2 72 ----- ----- Basin Index (%) 87 73 LOWER N. PLATTE Casper Mtn. 7900 17.0 14.4 118 12.5 16.1 78 Laprele Creek 8375 12.0 8.8 136 13.6 13.3 102 Reno Hill 8400 18.0 14.1 128 17.5 16.6 105 Windy Peak 7900 9.6 7.1 135 9.3 11.3 82 ----- ----- Basin Index (%) 127 92 LARAMIE RIVER Brooklyn Lake 10240 29.9 22.1 135 29.2 22.3 131 Cinnabar Park 9574 25.1 20.7 121 27.6 25.0 110 Crow Creek 8330 8.2 2.3 357 12.5 11.7 107 Deadman Hill 10220 21.4 16.5 130 19.1 18.4 104 Rawah 9020 11.2 9.2 122 15.9 15.3 104 Roach 9700 16.7 16.5 101 17.9 20.2 89 Windy Peak 7900 9.6 7.1 135 9.3 11.3 82 ----- ----- Basin Index (%) 129 106 S. PLATTE Black Mountain 8920 12.7 -M * 15.6 -M * Crow Creek 8330 8.2 2.3 357 12.5 11.7 107 Deadman Hill 10220 21.4 16.5 130 19.1 18.4 104 ----- ----- Basin Index (%) 157 105 LITTLE SNAKE RIVER Battle Mountain 7440 9.1 5.8 157 14.6 15.7 93 Divide Peak 8880 21.6 19.6 110 23.0 22.4 103 Elk River 8700 20.0 16.5 121 19.3 20.9 92 Little Snake River 8915 28.6 25.3 113 34.6 30.9 112 Old Battle 10000 34.2 32.3 106 32.1 36.4 88 Sage Creek Basin 7850 12.5 7.6 164 13.2 15.0 88 Sandstone RS 8150 16.4 11.1 148 17.3 19.1 91 Whiskey Park 8950 34.0 26.5 128 33.5 29.1 115 ----- ----- Basin Index (%) 122 99 UPPER GREEN RIVER Big Sandy Opening 9080 11.1 12.8 87 10.0 13.8 72 Blind Bull Sum 8650 28.1 23.9 118 17.2 20.0 86 East Rim Divide 7930 12.0 9.7 124 11.2 12.1 93 Elkhart Park G.S. 9400 10.9 12.0 91 11.0 13.8 80 Gros Ventre Summit 8750 13.5 13.1 103 13.7 13.5 101 Gunsight Pass 9820 14.4 13.4 107 14.5 14.6 99 Indian Creek 9425 24.8 23.5 106 17.6 23.2 76 Kendall R.S. 7740 11.3 9.3 122 12.7 14.6 87 Loomis Park 8240 15.7 13.3 118 19.9 17.7 112 New Fork Lake 8340 10.7 9.3 115 -M 11.1 * Pocket Creek 9360 -M -M * 9.3 -M * Snider Basin 8060 12.3 11.3 109 14.6 14.6 100 Spring Creek Divide 9000 28.2 23.4 121 26.3 24.4 108 Triple Peak 8500 29.3 19.3 152 27.4 26.0 105 ----- ----- Basin Index (%) 114 94 LOWER GREEN RIVER Blacks Fork Jct 8869 8.2 -M * 13.2 -M * Buck Pasture 9632 19.1 -M * 19.0 -M * EF Blacks Fork GS 9360 15.3 -M * 13.1 -M * Hams Fork 7840 10.8 7.8 138 12.1 11.8 103 Hewinta 9500 13.0 9.1 143 15.9 14.6 109 Hickerson Park 9122 10.5 6.1 172 12.4 10.8 115 Hole-in-Rock 9168 10.4 6.4 162 12.1 10.3 117 Indian Creek 9425 24.8 23.5 106 17.6 23.2 76 Kelley R.S. 8180 15.5 13.4 116 17.0 18.6 91 Spirit Lk 10235 17.9 -M * 19.2 -M * Steel Creek Park 10158 18.8 16.1 117 19.7 17.4 113 ----- ----- Basin Index (%) 126 100 UPPER BEAR RIVER Bear River RS 8777 8.8 -M * 12.5 -M * Bug Lake 7987 19.2 18.4 104 19.4 20.0 97 Burts Miller Ranch 8000 2.8 -M * 7.7 -M * Chalk Creek #1 9171 21.8 24.9 88 20.6 26.3 78 Hayden Fork 9130 17.2 13.0 132 22.0 22.0 100 Kelley R.S. 8180 15.5 13.4 116 17.0 18.6 91 Lily Lake 9133 12.8 11.7 109 14.0 17.9 78 Monte Cristo 8932 29.8 27.6 108 26.9 26.9 100 Salt River Summit 7640 15.3 10.6 144 16.9 17.1 99 Spring Creek Divide 9000 28.2 23.4 121 26.3 24.4 108 ----- ----- Basin Index (%) 112 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.