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 THURSDAY: APRIL 23 , 2020 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 15.3 11.3 135 20.0 22.0 91 Black Bear 8170 -M 36.8 * 33.9 40.3 84 Blind Bull Sum 8650 28.5 24.3 117 17.3 20.5 84 Cottonwood Creek 7670 24.9 17.8 140 31.2 26.2 119 East Rim Divide 7930 9.9 9.3 106 11.4 12.3 93 Grand Targhee 9260 46.0 42.7 108 32.9 33.0 100 Granite Creek 6770 18.0 10.0 180 18.2 20.5 89 Grassy Lake 7265 32.9 30.6 108 35.5 37.8 94 Gros Ventre Summit 8750 13.2 12.9 102 14.0 13.9 101 Gunsight Pass 9820 14.0 13.6 103 14.6 15.2 96 Lewis Lake Divide 7850 28.3 30.7 92 33.2 37.2 89 Phillips Bench 8200 -M 25.3 * -M 29.5 * Salt River Summit 7640 14.0 8.9 157 17.2 17.6 98 Snake River Station 6920 15.3 10.9 140 22.9 23.8 96 Spring Creek Divide 9000 28.5 23.6 121 26.6 25.2 106 Thumb Divide 7980 17.0 14.3 119 17.9 20.0 90 Togwotee Pass 9580 28.9 24.3 119 29.0 26.0 112 Two Ocean Plateau 9240 34.3 28.7 120 27.9 28.9 97 Willow Creek 8080 39.3 26.4 149 38.6 35.8 108 Younts Peak 8350 18.3 15.1 121 15.9 16.9 94 ----- ----- Basin Index (%) 120 97 MADISON-GALLATIN Black Bear 8170 -M 36.8 * 33.9 40.3 84 Canyon 7870 15.0 12.0 125 16.1 17.2 94 Madison Plateau 7750 22.4 22.8 98 20.6 27.8 74 West Yellowstone 6700 6.1 6.0 102 9.5 15.3 62 Whiskey Creek 6800 15.4 15.4 100 18.4 21.5 86 ----- ----- Basin Index (%) 105 81 YELLOWSTONE Beartooth Lake 9360 25.0 23.6 106 23.6 21.0 112 Burnt Mtn 5880 8.1 .0 * 16.6 14.5 114 Canyon 7870 15.0 12.0 125 16.1 17.2 94 Cole Creek 7850 20.4 16.4 124 15.9 14.9 107 Evening Star 9200 29.2 24.4 120 32.3 29.1 111 Fisher Creek 9100 35.0 33.0 106 35.6 33.8 105 Northeast Entrance 7350 8.5 5.7 149 13.4 13.1 102 Parker Peak 9400 29.2 21.4 136 25.7 19.1 135 Sylvan Lake 8420 22.1 20.3 109 25.7 24.0 107 Thumb Divide 7980 17.0 14.3 119 17.9 20.0 90 Two Ocean Plateau 9240 34.3 28.7 120 27.9 28.9 97 White Mill 8700 28.0 23.7 118 23.5 25.2 93 Wolverine 7650 12.0 6.2 194 14.3 13.1 109 Younts Peak 8350 18.3 15.1 121 15.9 16.9 94 ----- ----- Basin Index (%) 123 105 WIND RIVER Burroughs Creek 8750 13.8 -M * 15.2 -M * Castle Creek 8400 4.4 -M * 8.2 -M * Cold Springs 9630 7.3 3.9 187 9.1 11.3 81 Deer Park 9700 15.0 16.4 91 15.9 22.1 72 Hobbs Park 10100 15.3 15.3 100 14.5 15.3 95 Kirwin 9550 12.9 10.1 128 12.3 12.8 96 Little Warm 9370 12.4 9.9 125 11.3 14.2 80 Owl Creek 8975 5.5 3.2 172 8.6 7.1 121 South Pass 9040 12.7 15.3 83 13.4 19.0 71 St. Lawrence Alt 8620 4.6 5.1 90 9.1 10.3 88 Togwotee Pass 9580 28.9 24.3 119 29.0 26.0 112 Townsend Creek 8700 11.1 9.0 123 12.5 13.7 91 ----- ----- Basin Index (%) 112 89 BIGHORN BASIN Bald Mtn. 9380 22.2 20.1 110 18.1 18.5 98 Bear Trap Meadow 8200 7.3 2.5 292 10.5 9.7 108 Bone Springs Div 9350 18.4 16.3 113 16.2 17.1 95 Grave Springs 8550 9.9 9.4 105 11.0 11.9 92 Kirwin 9550 12.9 10.1 128 12.3 12.8 96 Marquette 8760 9.2 -M * 10.7 -M * Middle Powder 7760 12.8 12.4 103 12.6 13.1 96 Owl Creek 8975 5.5 3.2 172 8.6 7.1 121 Powder River Pass 9480 12.3 10.2 121 14.2 14.0 101 Shell Creek 9580 16.4 15.7 104 15.5 15.1 103 Timber Creek 7950 5.0 4.2 119 8.4 8.8 95 ----- ----- Basin Index (%) 118 99 SHOSHONE RIVER Blackwater 9780 25.4 24.1 105 25.6 22.2 115 Evening Star 9200 29.2 24.4 120 32.3 29.1 111 Marquette 8760 9.2 -M * 10.7 -M * Sylvan Lake 8420 22.1 20.3 109 25.7 24.0 107 Sylvan Road 7120 7.8 8.9 88 18.2 17.8 102 Younts Peak 8350 18.3 15.1 121 15.9 16.9 94 ----- ----- Basin Index (%) 111 107 POWDER RIVER Bear Trap Meadow 8200 7.3 2.5 292 10.5 9.7 108 Cloud Peak Reservoir 9860 15.2 16.1 94 15.3 15.3 100 Grave Springs 8550 9.9 9.4 105 11.0 11.9 92 Hansen Sawmill 8360 7.6 4.5 169 10.2 9.9 103 Middle Powder 7760 12.8 12.4 103 12.6 13.1 96 Powder River Pass 9480 12.3 10.2 121 14.2 14.0 101 Soldier Park 8720 7.1 -M * 10.2 -M * ----- ----- Basin Index (%) 118 100 TONGUE RIVER Big Goose 7990 9.8 9.2 107 11.0 13.1 84 Bone Springs Div 9350 18.4 16.3 113 16.2 17.1 95 Burgess Junction 7880 12.3 12.6 98 13.6 13.7 99 Dome Lake 8880 13.4 11.8 114 11.4 15.2 75 Little Goose 8870 12.1 -M * -M -M * Sucker Creek 8880 14.3 12.7 113 14.9 16.1 93 Tie Creek 6870 7.2 3.9 185 14.0 13.3 105 ----- ----- Basin Index (%) 113 92 BELLE FOURCHE Blind Park 6890 2.9 3.9 74 9.2 13.4 69 Cole Canyon 5910 -M 1.4 * -M 10.7 * ----- ----- Basin Index (%) 74 69 CHEYENNE RIVER BASIN Blind Park 6890 2.9 3.9 74 9.2 13.4 69 North Rapid Creek 6130 4.9 3.9 126 9.2 11.4 81 ----- ----- Basin Index (%) 100 74 UPPER N. PLATTE Arapaho Ridge 10960 23.9 21.5 111 24.0 24.7 97 Blackhall Mtn 9820 32.9 -M * 31.8 -M * Columbine 9160 28.1 20.7 136 31.0 27.3 114 Divide Peak 8880 21.7 18.3 119 23.3 23.2 100 Joe Wright 10120 24.1 22.7 106 29.6 28.3 105 Laprele Creek 8375 10.5 7.4 142 13.9 14.0 99 Med Bow 10500 45.9 -M * 38.2 -M * Never Summer 10280 -M 20.9 * -M -M * North French Creek 10130 35.7 32.2 111 34.7 29.1 119 Old Battle 10000 34.2 33.5 102 32.6 37.5 87 Rawah 9020 10.7 8.1 132 16.1 15.8 102 Sage Creek Basin 7850 11.6 4.2 276 13.3 15.4 86 Sand Lake 10050 32.2 30.7 105 29.4 27.3 108 South Brush Creek 8440 10.8 9.8 110 14.3 16.7 86 Tower 10500 44.9 48.8 92 45.6 42.9 106 Webber Springs 9250 23.2 21.8 106 27.6 28.8 96 Whiskey Park 8950 33.8 25.6 132 33.7 30.1 112 Willow Creek Pass 9540 15.3 13.5 113 14.6 14.7 99 Zirkel 9340 -M 22.5 * -M 30.0 * ----- ----- Basin Index (%) 113 102 SWEETWATER Deer Park 9700 15.0 16.4 91 15.9 22.1 72 Larsen Creek 9000 4.7 10.0 47 10.6 -M * South Pass 9040 12.7 15.3 83 13.4 19.0 71 ----- ----- Basin Index (%) 78 71 LOWER N. PLATTE Casper Mtn. 7900 15.8 14.2 111 12.5 16.9 74 Laprele Creek 8375 10.5 7.4 142 13.9 14.0 99 Reno Hill 8400 17.8 14.0 127 18.8 17.5 107 Windy Peak 7900 9.0 6.3 143 10.1 12.0 84 ----- ----- Basin Index (%) 127 92 LARAMIE RIVER Brooklyn Lake 10240 30.1 22.5 134 29.6 23.3 127 Cinnabar Park 9574 24.7 19.9 124 28.6 25.8 111 Crow Creek 8330 6.8 .2 3400* 12.8 12.2 105 Deadman Hill 10220 21.6 17.7 122 19.3 19.4 99 Rawah 9020 10.7 8.1 132 16.1 15.8 102 Roach 9700 16.8 16.7 101 18.5 21.0 88 Windy Peak 7900 9.0 6.3 143 10.1 12.0 84 ----- ----- Basin Index (%) 131 104 S. PLATTE Black Mountain 8920 11.4 -M * 15.8 -M * Crow Creek 8330 6.8 .2 3400* 12.8 12.2 105 Deadman Hill 10220 21.6 17.7 122 19.3 19.4 99 ----- ----- Basin Index (%) 159* 102 LITTLE SNAKE RIVER Battle Mountain 7440 7.7 2.9 266 15.2 16.3 93 Divide Peak 8880 21.7 18.3 119 23.3 23.2 100 Elk River 8700 19.1 14.8 129 19.5 21.7 90 Little Snake River 8915 28.0 23.6 119 34.8 31.3 111 Old Battle 10000 34.2 33.5 102 32.6 37.5 87 Sage Creek Basin 7850 11.6 4.2 276 13.3 15.4 86 Sandstone RS 8150 13.6 9.6 142 17.5 19.8 88 Whiskey Park 8950 33.8 25.6 132 33.7 30.1 112 ----- ----- Basin Index (%) 128 97 UPPER GREEN RIVER Big Sandy Opening 9080 10.5 12.3 85 10.1 14.4 70 Blind Bull Sum 8650 28.5 24.3 117 17.3 20.5 84 East Rim Divide 7930 9.9 9.3 106 11.4 12.3 93 Elkhart Park G.S. 9400 10.7 11.8 91 11.3 14.3 79 Gros Ventre Summit 8750 13.2 12.9 102 14.0 13.9 101 Gunsight Pass 9820 14.0 13.6 103 14.6 15.2 96 Indian Creek 9425 24.5 23.5 104 17.8 24.0 74 Kendall R.S. 7740 9.6 7.3 132 12.9 14.9 87 Loomis Park 8240 14.8 12.3 120 20.2 18.2 111 New Fork Lake 8340 9.0 8.1 111 10.3 11.5 90 Pocket Creek 9360 -M -M * 9.4 -M * Snider Basin 8060 10.6 10.4 102 15.0 15.0 100 Spring Creek Divide 9000 28.5 23.6 121 26.6 25.2 106 Triple Peak 8500 28.6 19.2 149 28.5 26.7 107 ----- ----- Basin Index (%) 113 93 LOWER GREEN RIVER Blacks Fork Jct 8869 7.8 -M * 13.3 -M * Buck Pasture 9632 18.1 -M * 19.1 -M * EF Blacks Fork GS 9360 14.2 -M * 13.4 -M * Hams Fork 7840 8.4 5.7 147 12.4 12.3 101 Hewinta 9500 12.4 7.4 168 16.2 15.3 106 Hickerson Park 9122 9.3 5.1 182 12.4 11.3 110 Hole-in-Rock 9168 9.7 5.5 176 12.5 10.8 116 Indian Creek 9425 24.5 23.5 104 17.8 24.0 74 Kelley R.S. 8180 14.7 12.0 122 17.4 19.3 90 Spirit Lk 10235 17.6 -M * 19.3 -M * Steel Creek Park 10158 18.9 16.4 115 19.9 18.1 110 ----- ----- Basin Index (%) 129 98 UPPER BEAR RIVER Bear River RS 8777 6.5 -M * 12.6 -M * Bug Lake 7987 18.4 16.4 112 19.6 20.7 95 Burts Miller Ranch 8000 .1 -M * 7.8 -M * Chalk Creek #1 9171 21.2 24.5 87 20.8 27.2 76 Hayden Fork 9130 15.2 11.0 138 22.2 22.7 98 Kelley R.S. 8180 14.7 12.0 122 17.4 19.3 90 Lily Lake 9133 12.1 10.1 120 14.0 18.6 75 Monte Cristo 8932 28.9 27.3 106 27.5 27.9 99 Salt River Summit 7640 14.0 8.9 157 17.2 17.6 98 Spring Creek Divide 9000 28.5 23.6 121 26.6 25.2 106 ----- ----- Basin Index (%) 114 92 ----------------------------------------------------------------------------- -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.