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 TUESDAY: MAY 21 , 2019 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 .1 .0 * 25.4 24.6 103 Black Bear 8170 39.3 33.2 118 51.5 44.7 115 Blind Bull Sum 8650 23.8 19.4 123 23.6 23.3 101 Cottonwood Creek 7670 9.7 5.4 180 32.3 30.0 108 East Rim Divide 7930 .0 .0 * 15.8 14.2 111 Grand Targhee 9260 43.5 41.8 104 39.7 36.8 108 Granite Creek 6770 1.0 .0 * 25.2 23.0 110 Grassy Lake 7265 -M 16.4 * -M 41.9 * Gros Ventre Summit 8750 .7 4.9 14 15.9 16.2 98 Gunsight Pass 9820 12.8 9.9 129 20.1 17.7 114 Lewis Lake Divide 7850 22.6 21.7 104 44.6 41.1 109 Phillips Bench 8200 19.9 18.4 108 37.9 33.0 115 Salt River Summit 7640 .0 .0 * 21.0 20.0 105 Snake River Station 6920 .0 .0 * 29.5 26.6 111 Spring Creek Divide 9000 21.1 19.7 107 29.1 28.1 104 Thumb Divide 7980 4.7 .8 588* 23.2 22.8 102 Togwotee Pass 9580 23.6 22.9 103 30.2 29.8 101 Two Ocean Plateau 9240 28.2 28.2 100 30.7 33.0 93 Willow Creek 8080 18.9 15.8 120 43.3 41.0 106 Younts Peak 8350 -M 11.5 * -M 19.6 * ----- ----- Basin Index (%) 111 107 MADISON-GALLATIN Black Bear 8170 39.3 33.2 118 51.5 44.7 115 Canyon 7870 4.2 1.6 262 19.9 19.9 100 Madison Plateau 7750 20.8 13.8 151 34.0 31.6 108 West Yellowstone 6700 .1 .0 * 21.3 17.6 121 Whiskey Creek 6800 8.9 5.0 178 25.6 24.4 105 ----- ----- Basin Index (%) 137 110 YELLOWSTONE Beartooth Lake 9360 24.2 21.4 113 25.5 24.2 105 Burnt Mtn 5880 .1 .0 * 21.9 19.2 114 Canyon 7870 4.2 1.6 262 19.9 19.9 100 Cole Creek 7850 18.7 15.8 118 -M 19.6 * Evening Star 9200 26.3 23.4 112 36.2 33.4 108 Fisher Creek 9100 34.7 32.5 107 43.1 38.5 112 Northeast Entrance 7350 .1 .0 * 18.4 15.6 118 Parker Peak 9400 24.2 19.6 123 29.9 22.5 133 Sylvan Lake 8420 14.0 14.7 95 32.8 27.7 118 Thumb Divide 7980 4.7 .8 588* 23.2 22.8 102 Two Ocean Plateau 9240 28.2 28.2 100 30.7 33.0 93 White Mill 8700 24.0 21.9 110 25.9 29.0 89 Wolverine 7650 .0 .0 * 16.8 15.6 108 Younts Peak 8350 -M 11.5 * -M 19.6 * ----- ----- Basin Index (%) 113 108 WIND RIVER Burroughs Creek 8750 1.8 -M * 17.5 -M * Castle Creek 8400 .0 -M * 10.1 -M * Cold Springs 9630 .4 .0 * 12.5 14.4 87 Deer Park 9700 13.2 10.0 132 24.3 26.0 93 Hobbs Park 10100 17.1 12.7 135 19.0 19.4 98 Kirwin 9550 6.2 8.0 78 15.2 15.9 96 Little Warm 9370 2.5 2.1 119 11.2 17.4 64 Owl Creek 8975 .8 .0 * 11.1 9.7 114 South Pass 9040 9.6 5.8 166 17.7 22.5 79 St. Lawrence Alt 8620 -M .0 * -M 13.5 * Togwotee Pass 9580 23.6 22.9 103 30.2 29.8 101 Townsend Creek 8700 6.5 .0 * 17.8 17.2 103 ----- ----- Basin Index (%) 130 92 BIGHORN BASIN Bald Mtn. 9380 18.7 18.8 99 18.2 22.1 82 Bear Trap Meadow 8200 .2 .0 * 10.2 12.6 81 Bone Springs Div 9350 14.0 14.0 100 16.7 20.9 80 Grave Springs 8550 2.9 1.9 153 12.3 15.1 81 Kirwin 9550 6.2 8.0 78 15.2 15.9 96 Marquette 8760 5.3 -M * 16.0 -M * Middle Powder 7760 .6 4.4 14 14.0 16.3 86 Owl Creek 8975 .8 .0 * 11.1 9.7 114 Powder River Pass 9480 2.7 4.7 57 -M 17.3 * Shell Creek 9580 14.7 14.9 99 15.0 18.5 81 Timber Creek 7950 .6 .0 * 11.7 12.2 96 ----- ----- Basin Index (%) 92 87 SHOSHONE RIVER Blackwater 9780 27.4 24.0 114 31.5 26.1 121 Evening Star 9200 26.3 23.4 112 36.2 33.4 108 Marquette 8760 5.3 -M * 16.0 -M * Sylvan Lake 8420 14.0 14.7 95 32.8 27.7 118 Sylvan Road 7120 .1 .0 * 19.2 20.3 95 Younts Peak 8350 -M 11.5 * -M 19.6 * ----- ----- Basin Index (%) 109 111 POWDER RIVER Bear Trap Meadow 8200 .2 .0 * 10.2 12.6 81 Cloud Peak Reservoir 9860 11.7 14.3 82 15.9 19.7 81 Grave Springs 8550 2.9 1.9 153 12.3 15.1 81 Hansen Sawmill 8360 .3 .0 * 12.1 13.0 93 Middle Powder 7760 .6 4.4 14 14.0 16.3 86 Powder River Pass 9480 2.7 4.7 57 -M 17.3 * Soldier Park 8720 .3 -M * 10.7 -M * ----- ----- Basin Index (%) 73 84 TONGUE RIVER Big Goose 7990 6.2 3.8 163 16.1 17.2 94 Bone Springs Div 9350 14.0 14.0 100 16.7 20.9 80 Burgess Junction 7880 5.7 7.6 75 13.0 17.0 76 Dome Lake 8880 6.3 5.4 117 15.0 19.1 79 Little Goose 8870 8.7 -M * 12.3 -M * Sucker Creek 8880 9.1 8.1 112 16.2 20.3 80 Tie Creek 6870 .3 .0 * 16.8 17.3 97 ----- ----- Basin Index (%) 107 84 BELLE FOURCHE Blind Park 6890 .0 .0 * 10.7 16.7 64 Cole Canyon 5910 .2 .0 * 18.4 14.9 123 ----- ----- Basin Index (%) * 92 CHEYENNE RIVER BASIN Blind Park 6890 .0 .0 * 10.7 16.7 64 North Rapid Creek 6130 -M .0 * -M 14.6 * ----- ----- Basin Index (%) * 64 UPPER N. PLATTE Arapaho Ridge 10960 24.5 17.3 142 32.2 28.5 113 Blackhall Mtn 9820 28.8 -M * 39.5 -M * Columbine 9160 8.4 1.7 494* 34.0 30.7 111 Divide Peak 8880 5.8 4.7 123 28.4 26.5 107 Joe Wright 10120 21.7 20.7 105 36.4 33.0 110 Laprele Creek 8375 .2 .0 * 17.9 17.0 105 Med Bow 10500 40.6 -M * 42.7 -M * Never Summer 10280 24.4 19.7 124 24.4 -M * North French Creek 10130 29.3 28.9 101 36.4 33.8 108 Old Battle 10000 39.1 32.2 121 43.5 42.2 103 Rawah 9020 .8 .4 200* 21.2 18.9 112 Sage Creek Basin 7850 -M .0 * 19.7 17.4 113 Sand Lake 10050 30.6 27.4 112 30.5 32.0 95 South Brush Creek 8440 .0 .0 * 15.8 20.2 78 Tower 10500 56.0 47.3 118 54.3 47.9 113 Webber Springs 9250 17.0 10.9 156 37.3 32.1 116 Whiskey Park 8950 24.8 20.9 119 38.8 33.9 114 Willow Creek Pass 9540 14.1 8.8 160 21.5 17.4 124 Zirkel 9340 17.4 8.1 215 44.1 33.4 132 ----- ----- Basin Index (%) 126 110 SWEETWATER Deer Park 9700 13.2 10.0 132 24.3 26.0 93 Larsen Creek 9000 .0 3.3 0 17.4 -M * South Pass 9040 9.6 5.8 166 17.7 22.5 79 ----- ----- Basin Index (%) 119 87 LOWER N. PLATTE Casper Mtn. 7900 5.2 3.6 144 17.5 20.5 85 Laprele Creek 8375 .2 .0 * 17.9 17.0 105 Reno Hill 8400 9.6 2.6 369 23.1 21.5 107 Windy Peak 7900 .3 .0 * 14.2 14.9 95 ----- ----- Basin Index (%) 247 98 LARAMIE RIVER Brooklyn Lake 10240 18.5 15.5 119 31.9 27.3 117 Cinnabar Park 9574 14.2 11.5 123 29.0 29.6 98 Crow Creek 8330 .2 .0 * 14.5 15.2 95 Deadman Hill 10220 17.5 16.0 109 24.5 23.1 106 Rawah 9020 .8 .4 200* 21.2 18.9 112 Roach 9700 10.3 10.8 95 27.5 24.7 111 Windy Peak 7900 .3 .0 * 14.2 14.9 95 ----- ----- Basin Index (%) 114 106 S. PLATTE Black Mountain 8920 .5 -M * 18.3 -M * Crow Creek 8330 .2 .0 * 14.5 15.2 95 Deadman Hill 10220 17.5 16.0 109 24.5 23.1 106 ----- ----- Basin Index (%) 111* 102 LITTLE SNAKE RIVER Battle Mountain 7440 .0 .0 * 20.7 18.6 111 Divide Peak 8880 5.8 4.7 123 28.4 26.5 107 Elk River 8700 1.3 .0 * 23.6 24.6 96 Little Snake River 8915 18.0 12.2 148 44.3 35.2 126 Old Battle 10000 39.1 32.2 121 43.5 42.2 103 Sage Creek Basin 7850 -M .0 * 19.7 17.4 113 Sandstone RS 8150 -M .0 * 22.4 22.5 100 Whiskey Park 8950 24.8 20.9 119 38.8 33.9 114 ----- ----- Basin Index (%) 127 109 UPPER GREEN RIVER Big Sandy Opening 9080 7.5 2.2 341 18.8 16.9 111 Blind Bull Sum 8650 23.8 19.4 123 23.6 23.3 101 East Rim Divide 7930 .0 .0 * 15.8 14.2 111 Elkhart Park G.S. 9400 10.0 5.2 192 18.4 16.8 110 Gros Ventre Summit 8750 .7 4.9 14 15.9 16.2 98 Gunsight Pass 9820 12.8 9.9 129 20.1 17.7 114 Indian Creek 9425 18.9 17.8 106 23.7 27.1 87 Kendall R.S. 7740 .0 .0 * 15.2 16.8 90 Loomis Park 8240 4.9 1.9 258 21.5 20.6 104 New Fork Lake 8340 .0 .0 * 14.0 13.6 103 Pocket Creek 9360 10.2 -M * 18.4 -M * Snider Basin 8060 .0 .0 * 16.6 16.8 99 Spring Creek Divide 9000 21.1 19.7 107 29.1 28.1 104 Triple Peak 8500 12.6 7.4 170 31.5 30.3 104 ----- ----- Basin Index (%) 127 102 LOWER GREEN RIVER Blacks Fork Jct 8869 .0 -M * 16.5 -M * Buck Pasture 9632 7.9 -M * 25.4 -M * EF Blacks Fork GS 9360 .1 -M * 16.3 -M * Hams Fork 7840 .0 .0 * 16.4 14.4 114 Hewinta 9500 .0 .0 * 19.1 17.8 107 Hickerson Park 9122 .1 .0 * 15.4 13.5 114 Hole-in-Rock 9168 .0 .0 * 14.6 13.1 111 Indian Creek 9425 18.9 17.8 106 23.7 27.1 87 Kelley R.S. 8180 3.5 2.1 167 20.7 21.8 95 Spirit Lk 10235 11.5 -M * 21.6 -M * Steel Creek Park 10158 15.0 14.2 106 24.0 21.1 114 ----- ----- Basin Index (%) 110* 104 UPPER BEAR RIVER Bear River RS 8777 .0 -M * 18.8 -M * Bug Lake 7987 8.9 3.8 234 28.9 23.6 122 Burts Miller Ranch 8000 .0 -M * 10.8 -M * Chalk Creek #1 9171 17.7 14.6 121 35.3 30.9 114 Hayden Fork 9130 .1 .0 * 28.7 25.9 111 Kelley R.S. 8180 3.5 2.1 167 20.7 21.8 95 Lily Lake 9133 .4 .0 * 20.5 21.4 96 Monte Cristo 8932 26.7 13.9 192 39.2 31.6 124 Salt River Summit 7640 .0 .0 * 21.0 20.0 105 Spring Creek Divide 9000 21.1 19.7 107 29.1 28.1 104 ----- ----- Basin Index (%) 145 110 ----------------------------------------------------------------------------- -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.