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 MONDAY: MAY 20 , 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 .0 * 25.5 24.5 104 Black Bear 8170 39.0 33.8 115 51.2 44.6 115 Blind Bull Sum 8650 24.1 19.9 121 22.9 23.2 99 Cottonwood Creek 7670 9.8 6.3 156 32.1 30.0 107 East Rim Divide 7930 .0 .5 0* 15.4 14.1 109 Grand Targhee 9260 43.5 42.3 103 39.7 36.8 108 Granite Creek 6770 1.1 .0 * 24.7 22.9 108 Grassy Lake 7265 -M 17.4 * -M 41.8 * Gros Ventre Summit 8750 .5 5.6 9 15.7 16.1 98 Gunsight Pass 9820 12.6 10.4 121 20.0 17.7 113 Lewis Lake Divide 7850 22.8 22.4 102 44.5 41.0 109 Phillips Bench 8200 19.5 19.2 102 37.5 32.8 114 Salt River Summit 7640 .2 .0 * 20.7 19.9 104 Snake River Station 6920 .0 .0 * 29.4 26.5 111 Spring Creek Divide 9000 20.8 20.3 102 28.7 28.0 102 Thumb Divide 7980 5.0 1.4 357* 23.2 22.8 102 Togwotee Pass 9580 23.4 23.0 102 30.1 29.7 101 Two Ocean Plateau 9240 28.1 28.3 99 30.7 32.8 94 Willow Creek 8080 19.0 16.6 114 43.0 40.8 105 Younts Peak 8350 -M 11.8 * -M 19.5 * ----- ----- Basin Index (%) 108 106 MADISON-GALLATIN Black Bear 8170 39.0 33.8 115 51.2 44.6 115 Canyon 7870 4.4 2.2 200 19.8 19.9 99 Madison Plateau 7750 20.4 14.3 143 33.6 31.5 107 West Yellowstone 6700 .0 .0 * 21.0 17.5 120 Whiskey Creek 6800 8.9 5.6 159 25.4 24.3 105 ----- ----- Basin Index (%) 130 110 YELLOWSTONE Beartooth Lake 9360 24.1 21.6 112 25.5 24.1 106 Burnt Mtn 5880 .2 .0 * 21.7 19.1 114 Canyon 7870 4.4 2.2 200 19.8 19.9 99 Cole Creek 7850 18.5 16.2 114 -M 19.5 * Evening Star 9200 26.2 23.7 111 36.1 33.3 108 Fisher Creek 9100 34.3 32.8 105 42.8 38.3 112 Northeast Entrance 7350 .1 .0 * 18.3 15.5 118 Parker Peak 9400 24.0 19.8 121 29.9 22.4 133 Sylvan Lake 8420 14.1 15.1 93 32.8 27.6 119 Thumb Divide 7980 5.0 1.4 357* 23.2 22.8 102 Two Ocean Plateau 9240 28.1 28.3 99 30.7 32.8 94 White Mill 8700 23.7 22.3 106 25.8 28.9 89 Wolverine 7650 .0 .0 * 16.7 15.5 108 Younts Peak 8350 -M 11.8 * -M 19.5 * ----- ----- Basin Index (%) 111 108 WIND RIVER Burroughs Creek 8750 1.6 -M * 17.3 -M * Castle Creek 8400 .0 -M * 9.8 -M * Cold Springs 9630 .1 .0 * 12.3 14.4 85 Deer Park 9700 13.0 10.5 124 23.9 25.9 92 Hobbs Park 10100 16.8 13.1 128 18.5 19.3 96 Kirwin 9550 6.1 8.4 73 15.1 15.9 95 Little Warm 9370 2.3 2.7 85 10.9 17.4 63 Owl Creek 8975 .5 .0 * 10.8 9.6 112 South Pass 9040 9.4 6.8 138 17.3 22.5 77 St. Lawrence Alt 8620 -M .0 * -M 13.5 * Togwotee Pass 9580 23.4 23.0 102 30.1 29.7 101 Townsend Creek 8700 6.2 .0 * 17.4 17.1 102 ----- ----- Basin Index (%) 121 91 BIGHORN BASIN Bald Mtn. 9380 18.6 19.2 97 18.1 22.1 82 Bear Trap Meadow 8200 .2 .0 * 10.0 12.6 79 Bone Springs Div 9350 14.1 14.3 99 16.6 20.8 80 Grave Springs 8550 2.7 2.6 104 12.2 15.0 81 Kirwin 9550 6.1 8.4 73 15.1 15.9 95 Marquette 8760 5.1 -M * 15.8 -M * Middle Powder 7760 .6 5.3 11 14.0 16.3 86 Owl Creek 8975 .5 .0 * 10.8 9.6 112 Powder River Pass 9480 2.7 5.4 50 -M 17.3 * Shell Creek 9580 14.7 15.3 96 14.9 18.5 81 Timber Creek 7950 .2 .0 * 11.4 12.2 93 ----- ----- Basin Index (%) 86 86 SHOSHONE RIVER Blackwater 9780 27.2 24.3 112 31.4 26.0 121 Evening Star 9200 26.2 23.7 111 36.1 33.3 108 Marquette 8760 5.1 -M * 15.8 -M * Sylvan Lake 8420 14.1 15.1 93 32.8 27.6 119 Sylvan Road 7120 .1 .0 * 19.2 20.3 95 Younts Peak 8350 -M 11.8 * -M 19.5 * ----- ----- Basin Index (%) 107 111 POWDER RIVER Bear Trap Meadow 8200 .2 .0 * 10.0 12.6 79 Cloud Peak Reservoir 9860 11.9 14.8 80 15.7 19.6 80 Grave Springs 8550 2.7 2.6 104 12.2 15.0 81 Hansen Sawmill 8360 .5 .0 * 11.9 12.9 92 Middle Powder 7760 .6 5.3 11 14.0 16.3 86 Powder River Pass 9480 2.7 5.4 50 -M 17.3 * Soldier Park 8720 .1 -M * 10.5 -M * ----- ----- Basin Index (%) 66 84 TONGUE RIVER Big Goose 7990 6.1 4.8 127 16.1 17.1 94 Bone Springs Div 9350 14.1 14.3 99 16.6 20.8 80 Burgess Junction 7880 5.7 8.1 70 12.9 17.0 76 Dome Lake 8880 6.2 6.2 100 14.9 19.0 78 Little Goose 8870 8.6 -M * 12.2 -M * Sucker Creek 8880 9.1 8.6 106 16.0 20.2 79 Tie Creek 6870 .2 .0 * 16.7 17.3 97 ----- ----- Basin Index (%) 99 84 BELLE FOURCHE Blind Park 6890 .0 .0 * 10.6 16.6 64 Cole Canyon 5910 .0 .0 * 18.1 14.9 121 ----- ----- Basin Index (%) * 91 CHEYENNE RIVER BASIN Blind Park 6890 .0 .0 * 10.6 16.6 64 North Rapid Creek 6130 -M .0 * -M 14.5 * ----- ----- Basin Index (%) * 64 UPPER N. PLATTE Arapaho Ridge 10960 23.8 18.1 131 31.6 28.5 111 Blackhall Mtn 9820 28.7 -M * 39.4 -M * Columbine 9160 8.0 3.0 267 33.5 30.6 109 Divide Peak 8880 5.6 5.7 98 28.3 26.5 107 Joe Wright 10120 20.9 21.1 99 35.9 32.8 109 Laprele Creek 8375 .1 .0 * 17.8 16.9 105 Med Bow 10500 40.2 -M * 42.3 -M * Never Summer 10280 23.7 20.3 117 23.8 -M * North French Creek 10130 28.8 29.6 97 36.2 33.7 107 Old Battle 10000 38.5 32.5 118 43.1 42.1 102 Rawah 9020 .3 .4 75* 20.7 18.9 110 Sage Creek Basin 7850 -M .0 * 19.6 17.4 113 Sand Lake 10050 30.3 27.8 109 30.3 31.9 95 South Brush Creek 8440 .0 .0 * 15.8 20.1 79 Tower 10500 55.4 47.7 116 54.0 47.9 113 Webber Springs 9250 16.8 12.0 140 36.9 32.1 115 Whiskey Park 8950 25.4 21.9 116 38.6 33.9 114 Willow Creek Pass 9540 13.8 9.3 148 21.1 17.3 122 Zirkel 9340 17.2 9.7 177 43.8 33.4 131 ----- ----- Basin Index (%) 119 109 SWEETWATER Deer Park 9700 13.0 10.5 124 23.9 25.9 92 Larsen Creek 9000 .0 3.6 0 17.2 -M * South Pass 9040 9.4 6.8 138 17.3 22.5 77 ----- ----- Basin Index (%) 107 85 LOWER N. PLATTE Casper Mtn. 7900 5.0 4.5 111 17.3 20.4 85 Laprele Creek 8375 .1 .0 * 17.8 16.9 105 Reno Hill 8400 9.6 3.6 267 22.9 21.3 108 Windy Peak 7900 .3 .0 * 14.1 14.9 95 ----- ----- Basin Index (%) 185 98 LARAMIE RIVER Brooklyn Lake 10240 18.2 16.4 111 31.6 27.2 116 Cinnabar Park 9574 14.0 12.3 114 28.8 29.5 98 Crow Creek 8330 .1 .0 * 14.2 15.1 94 Deadman Hill 10220 17.4 16.5 105 24.4 23.0 106 Rawah 9020 .3 .4 75* 20.7 18.9 110 Roach 9700 9.7 11.5 84 27.0 24.7 109 Windy Peak 7900 .3 .0 * 14.1 14.9 95 ----- ----- Basin Index (%) 105 105 S. PLATTE Black Mountain 8920 .4 -M * 18.1 -M * Crow Creek 8330 .1 .0 * 14.2 15.1 94 Deadman Hill 10220 17.4 16.5 105 24.4 23.0 106 ----- ----- Basin Index (%) 106* 101 LITTLE SNAKE RIVER Battle Mountain 7440 .0 .0 * 20.6 18.6 111 Divide Peak 8880 5.6 5.7 98 28.3 26.5 107 Elk River 8700 1.5 .0 * 23.5 24.6 96 Little Snake River 8915 17.9 13.3 135 44.0 35.2 125 Old Battle 10000 38.5 32.5 118 43.1 42.1 102 Sage Creek Basin 7850 -M .0 * 19.6 17.4 113 Sandstone RS 8150 .0 .0 * 22.4 22.5 100 Whiskey Park 8950 25.4 21.9 116 38.6 33.9 114 ----- ----- Basin Index (%) 121 109 UPPER GREEN RIVER Big Sandy Opening 9080 7.4 3.1 239 18.6 16.8 111 Blind Bull Sum 8650 24.1 19.9 121 22.9 23.2 99 East Rim Divide 7930 .0 .5 0* 15.4 14.1 109 Elkhart Park G.S. 9400 9.5 5.7 167 17.9 16.7 107 Gros Ventre Summit 8750 .5 5.6 9 15.7 16.1 98 Gunsight Pass 9820 12.6 10.4 121 20.0 17.7 113 Indian Creek 9425 18.5 18.5 100 23.2 27.0 86 Kendall R.S. 7740 .1 .0 * 14.9 16.8 89 Loomis Park 8240 4.5 2.6 173 21.0 20.5 102 New Fork Lake 8340 .0 .0 * 13.9 13.5 103 Pocket Creek 9360 10.0 -M * 18.3 -M * Snider Basin 8060 .1 .4 25* 16.4 16.8 98 Spring Creek Divide 9000 20.8 20.3 102 28.7 28.0 102 Triple Peak 8500 12.8 8.4 152 31.2 30.2 103 ----- ----- Basin Index (%) 116 101 LOWER GREEN RIVER Blacks Fork Jct 8869 .2 -M * 16.4 -M * Buck Pasture 9632 7.8 -M * 25.2 -M * EF Blacks Fork GS 9360 .2 -M * 16.0 -M * Hams Fork 7840 .1 .0 * 16.0 14.4 111 Hewinta 9500 .0 .0 * 18.9 17.7 107 Hickerson Park 9122 .5 .0 * 15.1 13.4 113 Hole-in-Rock 9168 .0 .0 * 14.4 13.0 111 Indian Creek 9425 18.5 18.5 100 23.2 27.0 86 Kelley R.S. 8180 3.3 2.8 118 20.3 21.8 93 Spirit Lk 10235 11.5 -M * 21.4 -M * Steel Creek Park 10158 14.8 14.7 101 23.7 21.0 113 ----- ----- Basin Index (%) 103* 103 UPPER BEAR RIVER Bear River RS 8777 .0 -M * 18.8 -M * Bug Lake 7987 9.5 4.9 194 28.9 23.5 123 Burts Miller Ranch 8000 -M -M * 10.8 -M * Chalk Creek #1 9171 17.7 15.6 113 35.1 30.8 114 Hayden Fork 9130 .3 .0 * 28.5 25.8 110 Kelley R.S. 8180 3.3 2.8 118 20.3 21.8 93 Lily Lake 9133 .7 .0 * 20.4 21.3 96 Monte Cristo 8932 26.9 14.9 181 39.1 31.6 124 Salt River Summit 7640 .2 .0 * 20.7 19.9 104 Spring Creek Divide 9000 20.8 20.3 102 28.7 28.0 102 ----- ----- Basin Index (%) 136 109 ----------------------------------------------------------------------------- -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.