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 30 , 2020 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 13.3 9.7 137 21.1 22.6 93 Black Bear 8170 -M 37.4 * 34.5 41.6 83 Blind Bull Sum 8650 29.3 23.4 125 17.9 21.2 84 Cottonwood Creek 7670 23.2 15.7 148 32.4 27.3 119 East Rim Divide 7930 5.4 8.3 65 11.7 12.9 91 Grand Targhee 9260 45.9 44.4 103 34.1 34.4 99 Granite Creek 6770 15.1 8.5 178 -M 21.3 * Grassy Lake 7265 29.7 29.4 101 36.4 39.1 93 Gros Ventre Summit 8750 13.8 11.7 118 15.0 14.5 103 Gunsight Pass 9820 14.7 12.8 115 15.8 16.0 99 Lewis Lake Divide 7850 26.1 30.3 86 34.0 38.4 89 Phillips Bench 8200 -M 25.6 * -M 30.5 * Salt River Summit 7640 9.9 8.0 124 17.6 18.3 96 Snake River Station 6920 12.4 7.9 157 23.5 24.6 96 Spring Creek Divide 9000 27.7 24.3 114 27.0 26.1 103 Thumb Divide 7980 14.1 12.9 109 18.5 20.8 89 Togwotee Pass 9580 29.3 24.7 119 30.0 27.1 111 Two Ocean Plateau 9240 32.9 29.7 111 28.7 29.9 96 Willow Creek 8080 37.1 23.5 158 40.1 37.4 107 Younts Peak 8350 16.2 15.4 105 16.5 17.5 94 ----- ----- Basin Index (%) 116 97 MADISON-GALLATIN Black Bear 8170 -M 37.4 * 34.5 41.6 83 Canyon 7870 13.8 10.8 128 16.5 17.9 92 Madison Plateau 7750 19.7 21.6 91 21.0 28.8 73 West Yellowstone 6700 .7 2.5 28 -M 15.9 * Whiskey Creek 6800 13.5 14.9 91 18.7 22.2 84 ----- ----- Basin Index (%) 96 82 YELLOWSTONE Beartooth Lake 9360 25.4 22.9 111 24.1 21.8 111 Burnt Mtn 5880 3.4 .0 * 16.1 15.5 104 Canyon 7870 13.8 10.8 128 16.5 17.9 92 Cole Creek 7850 19.0 16.4 116 16.0 16.2 99 Evening Star 9200 28.5 24.9 114 33.0 30.2 109 Fisher Creek 9100 34.8 32.8 106 36.3 34.9 104 Northeast Entrance 7350 5.2 3.5 149 14.0 13.7 102 Parker Peak 9400 29.7 21.4 139 26.2 19.9 132 Sylvan Lake 8420 20.0 20.1 100 26.5 24.9 106 Thumb Divide 7980 14.1 12.9 109 18.5 20.8 89 Two Ocean Plateau 9240 32.9 29.7 111 28.7 29.9 96 White Mill 8700 29.6 23.8 124 24.1 26.1 92 Wolverine 7650 7.7 3.1 248 14.6 13.7 107 Younts Peak 8350 16.2 15.4 105 16.5 17.5 94 ----- ----- Basin Index (%) 118 103 WIND RIVER Burroughs Creek 8750 10.8 -M * 15.2 -M * Castle Creek 8400 .1 -M * 8.3 -M * Cold Springs 9630 3.8 1.4 271 9.4 12.4 76 Deer Park 9700 12.5 16.1 78 16.1 23.2 69 Hobbs Park 10100 14.3 16.0 89 14.6 16.5 88 Kirwin 9550 12.3 10.4 118 12.5 13.6 92 Little Warm 9370 11.8 8.8 134 11.9 15.3 78 Owl Creek 8975 .9 1.2 75 8.7 7.8 112 South Pass 9040 10.9 15.0 73 13.5 20.2 67 St. Lawrence Alt 8620 .3 3.0 10 9.2 11.4 81 Togwotee Pass 9580 29.3 24.7 119 30.0 27.1 111 Townsend Creek 8700 9.4 7.8 121 12.6 14.8 85 ----- ----- Basin Index (%) 101 85 BIGHORN BASIN Bald Mtn. 9380 21.7 20.5 106 18.5 19.5 95 Bear Trap Meadow 8200 3.7 1.1 336 10.7 10.4 103 Bone Springs Div 9350 18.7 16.6 113 16.5 18.0 92 Grave Springs 8550 8.4 9.4 89 11.0 12.6 87 Kirwin 9550 12.3 10.4 118 12.5 13.6 92 Marquette 8760 8.1 -M * 11.0 -M * Middle Powder 7760 11.4 11.8 97 12.8 14.0 91 Owl Creek 8975 .9 1.2 75 8.7 7.8 112 Powder River Pass 9480 11.3 9.6 118 14.6 14.9 98 Shell Creek 9580 16.2 16.0 101 15.6 16.1 97 Timber Creek 7950 .7 3.2 22 8.4 9.8 86 ----- ----- Basin Index (%) 106 95 SHOSHONE RIVER Blackwater 9780 26.2 25.2 104 26.6 23.3 114 Evening Star 9200 28.5 24.9 114 33.0 30.2 109 Marquette 8760 8.1 -M * 11.0 -M * Sylvan Lake 8420 20.0 20.1 100 26.5 24.9 106 Sylvan Road 7120 2.8 6.3 44 18.3 18.5 99 Younts Peak 8350 16.2 15.4 105 16.5 17.5 94 ----- ----- Basin Index (%) 102 106 POWDER RIVER Bear Trap Meadow 8200 3.7 1.1 336 10.7 10.4 103 Cloud Peak Reservoir 9860 14.7 16.5 89 15.7 16.4 96 Grave Springs 8550 8.4 9.4 89 11.0 12.6 87 Hansen Sawmill 8360 5.1 2.9 176 10.4 10.7 97 Middle Powder 7760 11.4 11.8 97 12.8 14.0 91 Powder River Pass 9480 11.3 9.6 118 14.6 14.9 98 Soldier Park 8720 4.4 -M * 10.5 -M * ----- ----- Basin Index (%) 106 95 TONGUE RIVER Big Goose 7990 8.7 9.2 95 11.2 13.8 81 Bone Springs Div 9350 18.7 16.6 113 16.5 18.0 92 Burgess Junction 7880 12.2 12.1 101 13.7 14.6 94 Dome Lake 8880 12.9 11.5 112 11.8 16.2 73 Little Goose 8870 10.7 -M * -M -M * Sucker Creek 8880 13.2 12.3 107 15.3 17.1 89 Tie Creek 6870 4.1 2.7 152 14.2 14.1 101 ----- ----- Basin Index (%) 108 88 BELLE FOURCHE Blind Park 6890 -M 1.3 * 9.5 14.1 67 Cole Canyon 5910 -M .3 * -M 11.5 * ----- ----- Basin Index (%) * 67 CHEYENNE RIVER BASIN Blind Park 6890 -M 1.3 * 9.5 14.1 67 North Rapid Creek 6130 1.3 1.3 100 9.4 12.0 78 ----- ----- Basin Index (%) 100 72 UPPER N. PLATTE Arapaho Ridge 10960 -M 22.3 * -M 26.0 * Blackhall Mtn 9820 31.5 -M * 32.6 -M * Columbine 9160 24.7 18.6 133 32.9 28.4 116 Divide Peak 8880 17.1 18.0 95 24.1 24.1 100 Joe Wright 10120 24.9 23.4 106 30.9 29.6 104 Laprele Creek 8375 8.2 6.4 128 14.4 14.9 97 Med Bow 10500 45.9 -M * 39.5 -M * Never Summer 10280 23.3 21.7 107 18.5 -M * North French Creek 10130 36.4 32.9 111 35.8 30.5 117 Old Battle 10000 34.6 34.7 100 33.2 39.0 85 Rawah 9020 9.0 6.5 138 16.8 17.1 98 Sage Creek Basin 7850 5.8 1.1 527* 13.5 16.1 84 Sand Lake 10050 33.2 31.3 106 30.6 28.9 106 South Brush Creek 8440 7.1 9.6 74 14.7 17.7 83 Tower 10500 45.4 49.9 91 47.4 44.5 107 Webber Springs 9250 20.6 21.9 94 28.3 29.8 95 Whiskey Park 8950 29.9 26.3 114 34.5 31.3 110 Willow Creek Pass 9540 15.2 14.1 108 15.7 15.6 101 Zirkel 9340 -M 21.2 * -M 30.8 * ----- ----- Basin Index (%) 106 101 SWEETWATER Deer Park 9700 12.5 16.1 78 16.1 23.2 69 Larsen Creek 9000 .4 9.3 4 10.8 -M * South Pass 9040 10.9 15.0 73 13.5 20.2 67 ----- ----- Basin Index (%) 59 68 LOWER N. PLATTE Casper Mtn. 7900 14.1 13.7 103 13.6 17.8 76 Laprele Creek 8375 8.2 6.4 128 14.4 14.9 97 Reno Hill 8400 16.8 12.8 131 19.9 18.7 106 Windy Peak 7900 6.0 4.4 136 10.8 12.9 84 ----- ----- Basin Index (%) 121 91 LARAMIE RIVER Brooklyn Lake 10240 29.2 23.3 125 30.6 24.5 125 Cinnabar Park 9574 22.8 19.7 116 29.1 26.8 109 Crow Creek 8330 1.4 .0 * 13.3 13.3 100 Deadman Hill 10220 20.8 18.9 110 19.6 20.5 96 Rawah 9020 9.0 6.5 138 16.8 17.1 98 Roach 9700 14.3 17.2 83 18.9 22.2 85 Windy Peak 7900 6.0 4.4 136 10.8 12.9 84 ----- ----- Basin Index (%) 115 101 S. PLATTE Black Mountain 8920 8.5 -M * 16.3 -M * Crow Creek 8330 1.4 .0 * 13.3 13.3 100 Deadman Hill 10220 20.8 18.9 110 19.6 20.5 96 ----- ----- Basin Index (%) 117* 97 LITTLE SNAKE RIVER Battle Mountain 7440 2.1 .0 * 15.6 17.0 92 Divide Peak 8880 17.1 18.0 95 24.1 24.1 100 Elk River 8700 14.0 13.6 103 19.9 22.5 88 Little Snake River 8915 24.2 22.5 108 35.6 32.5 110 Old Battle 10000 34.6 34.7 100 33.2 39.0 85 Sage Creek Basin 7850 5.8 1.1 527* 13.5 16.1 84 Sandstone RS 8150 9.0 6.3 143 17.5 20.6 85 Whiskey Park 8950 29.9 26.3 114 34.5 31.3 110 ----- ----- Basin Index (%) 112 95 UPPER GREEN RIVER Big Sandy Opening 9080 8.7 10.9 80 10.2 15.1 68 Blind Bull Sum 8650 29.3 23.4 125 17.9 21.2 84 East Rim Divide 7930 5.4 8.3 65 11.7 12.9 91 Elkhart Park G.S. 9400 9.8 11.5 85 11.8 14.9 79 Gros Ventre Summit 8750 13.8 11.7 118 15.0 14.5 103 Gunsight Pass 9820 14.7 12.8 115 15.8 16.0 99 Indian Creek 9425 21.4 23.3 92 18.1 24.9 73 Kendall R.S. 7740 6.8 4.8 142 13.6 15.4 88 Loomis Park 8240 12.7 11.2 113 21.1 18.8 112 New Fork Lake 8340 6.7 6.6 102 -M 12.0 * Pocket Creek 9360 -M -M * 9.6 -M * Snider Basin 8060 5.6 9.5 59 15.2 15.5 98 Spring Creek Divide 9000 27.7 24.3 114 27.0 26.1 103 Triple Peak 8500 24.9 17.9 139 30.0 27.8 108 ----- ----- Basin Index (%) 106 93 LOWER GREEN RIVER Blacks Fork Jct 8869 3.4 -M * 13.4 -M * Buck Pasture 9632 13.8 -M * 19.3 -M * EF Blacks Fork GS 9360 9.7 -M * 13.6 -M * Hams Fork 7840 3.5 3.3 106 12.9 13.0 99 Hewinta 9500 6.4 5.0 128 16.3 16.0 102 Hickerson Park 9122 4.5 4.5 100 12.3 11.9 103 Hole-in-Rock 9168 4.4 2.9 152 12.6 11.4 111 Indian Creek 9425 21.4 23.3 92 18.1 24.9 73 Kelley R.S. 8180 10.9 11.7 93 17.6 20.1 88 Spirit Lk 10235 14.8 -M * 19.4 -M * Steel Creek Park 10158 16.9 17.0 99 20.1 18.9 106 ----- ----- Basin Index (%) 100 95 UPPER BEAR RIVER Bear River RS 8777 .4 -M * 12.6 -M * Bug Lake 7987 14.4 15.4 94 19.8 21.6 92 Burts Miller Ranch 8000 .0 -M * 7.8 -M * Chalk Creek #1 9171 -M 24.4 * -M 28.2 * Hayden Fork 9130 8.6 9.5 91 22.3 23.6 94 Kelley R.S. 8180 10.9 11.7 93 17.6 20.1 88 Lily Lake 9133 8.3 9.9 84 14.0 19.4 72 Monte Cristo 8932 24.9 26.9 93 28.0 29.1 96 Salt River Summit 7640 9.9 8.0 124 17.6 18.3 96 Spring Creek Divide 9000 27.7 24.3 114 27.0 26.1 103 ----- ----- Basin Index (%) 99 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.