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 SUNDAY: MAY 12 , 2019 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 7.9 3.3 239 24.6 23.8 103 Black Bear 8170 43.0 36.8 117 49.8 43.4 115 Blind Bull Sum 8650 24.6 22.4 110 22.0 22.5 98 Cottonwood Creek 7670 14.8 12.1 122 30.4 29.1 104 East Rim Divide 7930 .0 5.4 0 14.5 13.7 106 Grand Targhee 9260 48.8 46.1 106 38.5 36.3 106 Granite Creek 6770 7.8 4.0 195 23.8 22.3 107 Grassy Lake 7265 -M 24.6 * -M 40.8 * Gros Ventre Summit 8750 4.5 9.4 48 14.9 15.5 96 Gunsight Pass 9820 14.9 12.3 121 19.2 17.2 112 Lewis Lake Divide 7850 29.7 28.5 104 43.5 40.0 109 Phillips Bench 8200 24.5 22.8 107 36.2 32.2 112 Salt River Summit 7640 4.9 3.2 153 19.3 19.3 100 Snake River Station 6920 4.0 1.1 364* 28.6 25.7 111 Spring Creek Divide 9000 23.9 23.3 103 27.5 27.4 100 Thumb Divide 7980 11.0 7.4 149 22.3 22.0 101 Togwotee Pass 9580 25.9 25.3 102 29.2 28.8 101 Two Ocean Plateau 9240 32.3 29.5 109 29.9 31.8 94 Willow Creek 8080 24.3 20.6 118 41.1 39.6 104 Younts Peak 8350 -M 14.9 * -M 18.8 * ----- ----- Basin Index (%) 111 105 MADISON-GALLATIN Black Bear 8170 43.0 36.8 117 49.8 43.4 115 Canyon 7870 9.9 6.7 148 19.0 19.1 99 Madison Plateau 7750 25.5 19.0 134 32.3 30.2 107 West Yellowstone 6700 .0 .0 * 19.9 16.8 118 Whiskey Creek 6800 13.3 9.9 134 24.7 23.3 106 ----- ----- Basin Index (%) 127 110 YELLOWSTONE Beartooth Lake 9360 25.7 22.9 112 24.5 23.3 105 Burnt Mtn 5880 .6 .0 * 19.8 18.4 108 Canyon 7870 9.9 6.7 148 19.0 19.1 99 Cole Creek 7850 20.7 17.2 120 -M 18.6 * Evening Star 9200 29.0 25.6 113 35.2 32.1 110 Fisher Creek 9100 35.9 34.4 104 41.6 36.9 113 Northeast Entrance 7350 .1 .6 17* 17.4 14.8 118 Parker Peak 9400 28.7 22.1 130 29.2 21.5 136 Sylvan Lake 8420 18.4 17.8 103 31.7 26.6 119 Thumb Divide 7980 11.0 7.4 149 22.3 22.0 101 Two Ocean Plateau 9240 32.3 29.5 109 29.9 31.8 94 White Mill 8700 27.2 24.9 109 24.8 27.8 89 Wolverine 7650 .0 .0 * 16.0 14.9 107 Younts Peak 8350 -M 14.9 * -M 18.8 * ----- ----- Basin Index (%) 115 108 WIND RIVER Burroughs Creek 8750 6.9 -M * 16.9 -M * Castle Creek 8400 .0 -M * 9.1 -M * Cold Springs 9630 4.0 1.0 400 12.2 13.8 88 Deer Park 9700 15.9 14.3 111 23.3 25.3 92 Hobbs Park 10100 19.2 15.8 122 18.1 18.3 99 Kirwin 9550 10.1 10.8 94 14.6 15.1 97 Little Warm 9370 7.5 6.6 114 11.4 16.6 69 Owl Creek 8975 .1 .4 25* 9.9 9.0 110 South Pass 9040 13.3 11.2 119 17.0 21.8 78 St. Lawrence Alt 8620 -M .6 * -M 12.9 * Togwotee Pass 9580 25.9 25.3 102 29.2 28.8 101 Townsend Creek 8700 9.8 2.8 350 16.6 16.3 102 ----- ----- Basin Index (%) 120 92 BIGHORN BASIN Bald Mtn. 9380 21.1 20.8 101 17.3 21.4 81 Bear Trap Meadow 8200 .1 .0 * 8.8 11.9 74 Bone Springs Div 9350 16.9 16.5 102 15.9 20.0 80 Grave Springs 8550 6.7 7.3 92 11.4 14.5 79 Kirwin 9550 10.1 10.8 94 14.6 15.1 97 Marquette 8760 8.3 -M * 13.1 -M * Middle Powder 7760 5.4 10.2 53 11.0 15.6 71 Owl Creek 8975 .1 .4 25* 9.9 9.0 110 Powder River Pass 9480 6.9 8.9 78 -M 16.5 * Shell Creek 9580 16.6 16.8 99 13.8 17.8 78 Timber Creek 7950 .7 1.1 64 10.3 11.4 90 ----- ----- Basin Index (%) 91 83 SHOSHONE RIVER Blackwater 9780 29.7 24.5 121 30.4 24.9 122 Evening Star 9200 29.0 25.6 113 35.2 32.1 110 Marquette 8760 8.3 -M * 13.1 -M * Sylvan Lake 8420 18.4 17.8 103 31.7 26.6 119 Sylvan Road 7120 .0 .7 0* 19.1 19.5 98 Younts Peak 8350 -M 14.9 * -M 18.8 * ----- ----- Basin Index (%) 112 113 POWDER RIVER Bear Trap Meadow 8200 .1 .0 * 8.8 11.9 74 Cloud Peak Reservoir 9860 14.6 16.7 87 15.1 18.6 81 Grave Springs 8550 6.7 7.3 92 11.4 14.5 79 Hansen Sawmill 8360 2.5 .6 417* 10.7 12.2 88 Middle Powder 7760 5.4 10.2 53 11.0 15.6 71 Powder River Pass 9480 6.9 8.9 78 -M 16.5 * Soldier Park 8720 .9 -M * 9.9 -M * ----- ----- Basin Index (%) 83 78 TONGUE RIVER Big Goose 7990 9.7 10.0 97 15.1 16.3 93 Bone Springs Div 9350 16.9 16.5 102 15.9 20.0 80 Burgess Junction 7880 9.6 11.3 85 12.3 16.3 75 Dome Lake 8880 9.3 10.9 85 13.7 18.3 75 Little Goose 8870 12.1 -M * 11.5 -M * Sucker Creek 8880 12.8 12.5 102 15.3 19.3 79 Tie Creek 6870 2.4 .9 267 15.9 16.4 97 ----- ----- Basin Index (%) 98 83 BELLE FOURCHE Blind Park 6890 .0 .0 * 10.1 15.9 64 Cole Canyon 5910 .0 .0 * 16.0 14.0 114 ----- ----- Basin Index (%) * 87 CHEYENNE RIVER BASIN Blind Park 6890 .0 .0 * 10.1 15.9 64 North Rapid Creek 6130 .0 .0 * -M 14.0 * ----- ----- Basin Index (%) * 64 UPPER N. PLATTE Arapaho Ridge 10960 25.6 22.3 115 30.8 27.9 110 Blackhall Mtn 9820 33.3 -M * 39.0 -M * Columbine 9160 14.4 11.2 129 32.9 29.8 110 Divide Peak 8880 13.5 13.0 104 28.2 25.7 110 Joe Wright 10120 22.3 23.2 96 35.0 31.7 110 Laprele Creek 8375 3.5 1.1 318 17.3 16.3 106 Med Bow 10500 41.4 -M * 41.3 -M * Never Summer 10280 25.0 22.2 113 23.0 -M * North French Creek 10130 31.9 32.5 98 35.4 32.7 108 Old Battle 10000 40.6 36.8 110 42.9 41.1 104 Rawah 9020 4.0 2.1 190 20.4 18.6 110 Sage Creek Basin 7850 3.4 .0 * 19.3 17.0 114 Sand Lake 10050 32.4 31.6 103 30.0 30.9 97 South Brush Creek 8440 .0 3.6 0 15.3 19.3 79 Tower 10500 56.1 50.9 110 53.1 46.8 113 Webber Springs 9250 22.0 18.4 120 36.5 31.3 117 Whiskey Park 8950 27.3 26.0 105 38.1 33.2 115 Willow Creek Pass 9540 17.6 12.6 140 21.1 16.6 127 Zirkel 9340 24.8 18.9 131 43.3 32.9 132 ----- ----- Basin Index (%) 112 111 SWEETWATER Deer Park 9700 15.9 14.3 111 23.3 25.3 92 Larsen Creek 9000 .0 5.9 0 16.8 -M * South Pass 9040 13.3 11.2 119 17.0 21.8 78 ----- ----- Basin Index (%) 93 86 LOWER N. PLATTE Casper Mtn. 7900 10.5 10.8 97 16.4 19.7 83 Laprele Creek 8375 3.5 1.1 318 17.3 16.3 106 Reno Hill 8400 14.3 9.4 152 21.7 20.6 105 Windy Peak 7900 2.0 .0 * 13.7 14.0 98 ----- ----- Basin Index (%) 142 98 LARAMIE RIVER Brooklyn Lake 10240 23.4 20.8 112 31.3 26.2 119 Cinnabar Park 9574 18.1 16.7 108 28.3 28.8 98 Crow Creek 8330 .0 .0 * 13.7 14.6 94 Deadman Hill 10220 22.3 18.5 121 24.3 22.0 110 Rawah 9020 4.0 2.1 190 20.4 18.6 110 Roach 9700 14.9 15.0 99 26.7 23.6 113 Windy Peak 7900 2.0 .0 * 13.7 14.0 98 ----- ----- Basin Index (%) 116 107 S. PLATTE Black Mountain 8920 6.7 -M * 17.9 -M * Crow Creek 8330 .0 .0 * 13.7 14.6 94 Deadman Hill 10220 22.3 18.5 121 24.3 22.0 110 ----- ----- Basin Index (%) 121* 104 LITTLE SNAKE RIVER Battle Mountain 7440 .0 .0 * 20.2 18.1 112 Divide Peak 8880 13.5 13.0 104 28.2 25.7 110 Elk River 8700 9.2 6.2 148 23.4 24.0 98 Little Snake River 8915 23.5 19.8 119 43.6 34.6 126 Old Battle 10000 40.6 36.8 110 42.9 41.1 104 Sage Creek Basin 7850 3.4 .0 * 19.3 17.0 114 Sandstone RS 8150 3.0 .8 375* 21.9 22.0 100 Whiskey Park 8950 27.3 26.0 105 38.1 33.2 115 ----- ----- Basin Index (%) 117 110 UPPER GREEN RIVER Big Sandy Opening 9080 11.9 8.5 140 18.0 16.3 110 Blind Bull Sum 8650 24.6 22.4 110 22.0 22.5 98 East Rim Divide 7930 .0 5.4 0 14.5 13.7 106 Elkhart Park G.S. 9400 13.1 9.4 139 17.3 16.2 107 Gros Ventre Summit 8750 4.5 9.4 48 14.9 15.5 96 Gunsight Pass 9820 14.9 12.3 121 19.2 17.2 112 Indian Creek 9425 20.9 21.2 99 22.1 26.4 84 Kendall R.S. 7740 .1 .0 * 14.3 16.3 88 Loomis Park 8240 9.5 6.7 142 20.3 20.0 102 New Fork Lake 8340 3.5 2.1 167 12.9 13.0 99 Pocket Creek 9360 13.9 -M * 17.9 -M * Snider Basin 8060 .0 6.9 0 15.8 16.4 96 Spring Creek Divide 9000 23.9 23.3 103 27.5 27.4 100 Triple Peak 8500 17.7 14.2 125 30.0 29.4 102 ----- ----- Basin Index (%) 102 99 LOWER GREEN RIVER Blacks Fork Jct 8869 .3 -M * 16.2 -M * Buck Pasture 9632 13.4 -M * 24.7 -M * EF Blacks Fork GS 9360 4.3 -M * 15.4 -M * Hams Fork 7840 .0 .0 * 15.2 14.0 109 Hewinta 9500 4.0 1.1 364 18.5 17.3 107 Hickerson Park 9122 1.6 .0 * 15.0 13.0 115 Hole-in-Rock 9168 .3 .0 * 14.3 12.5 114 Indian Creek 9425 20.9 21.2 99 22.1 26.4 84 Kelley R.S. 8180 8.0 7.8 103 19.2 21.3 90 Spirit Lk 10235 14.3 -M * 20.9 -M * Steel Creek Park 10158 17.3 17.4 99 23.3 20.4 114 ----- ----- Basin Index (%) 110* 102 UPPER BEAR RIVER Bear River RS 8777 .0 -M * 18.6 -M * Bug Lake 7987 15.8 11.7 135 28.1 22.9 123 Burts Miller Ranch 8000 -M -M * 10.8 -M * Chalk Creek #1 9171 21.4 20.7 103 34.3 30.1 114 Hayden Fork 9130 6.6 5.0 132 27.8 25.2 110 Kelley R.S. 8180 8.0 7.8 103 19.2 21.3 90 Lily Lake 9133 7.4 3.6 206 20.1 20.8 97 Monte Cristo 8932 30.4 20.6 148 37.3 30.9 121 Salt River Summit 7640 4.9 3.2 153 19.3 19.3 100 Spring Creek Divide 9000 23.9 23.3 103 27.5 27.4 100 ----- ----- Basin Index (%) 123 108 ----------------------------------------------------------------------------- -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.