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 7 , 2019 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 10.4 6.1 170 24.5 23.4 105 Black Bear 8170 43.1 37.0 116 49.0 42.6 115 Blind Bull Sum 8650 23.8 22.6 105 21.4 21.9 98 Cottonwood Creek 7670 16.6 13.5 123 29.5 28.3 104 East Rim Divide 7930 .0 6.9 0 14.1 13.3 106 Grand Targhee 9260 49.7 46.4 107 38.1 35.7 107 Granite Creek 6770 10.4 6.7 155 23.5 21.9 107 Grassy Lake 7265 -M 27.0 * -M 40.1 * Gros Ventre Summit 8750 6.1 10.2 60 14.7 15.1 97 Gunsight Pass 9820 15.3 11.7 131 18.9 16.5 115 Lewis Lake Divide 7850 32.2 29.4 110 43.1 39.3 110 Phillips Bench 8200 26.6 23.6 113 35.8 31.4 114 Salt River Summit 7640 6.8 6.2 110 18.8 18.8 100 Snake River Station 6920 7.2 4.0 180 28.2 25.3 111 Spring Creek Divide 9000 23.4 24.1 97 26.5 26.8 99 Thumb Divide 7980 13.1 9.7 135 21.8 21.5 101 Togwotee Pass 9580 25.7 25.0 103 28.8 28.1 102 Two Ocean Plateau 9240 33.5 29.8 112 29.8 30.8 97 Willow Creek 8080 26.5 21.7 122 40.2 38.6 104 Younts Peak 8350 -M 15.6 * -M 18.3 * ----- ----- Basin Index (%) 111 106 MADISON-GALLATIN Black Bear 8170 43.1 37.0 116 49.0 42.6 115 Canyon 7870 10.8 8.2 132 18.5 18.5 100 Madison Plateau 7750 26.9 20.7 130 31.5 29.6 106 West Yellowstone 6700 .0 .0 * 19.2 16.4 117 Whiskey Creek 6800 14.5 11.9 122 24.1 22.8 106 ----- ----- Basin Index (%) 122 110 YELLOWSTONE Beartooth Lake 9360 25.0 22.9 109 23.7 22.7 104 Burnt Mtn 5880 2.9 .0 * 19.0 16.6 114 Canyon 7870 10.8 8.2 132 18.5 18.5 100 Cole Creek 7850 20.3 16.9 120 -M 17.2 * Evening Star 9200 28.6 25.1 114 34.4 31.3 110 Fisher Creek 9100 36.5 33.4 109 41.2 36.1 114 Northeast Entrance 7350 .2 1.0 20 17.1 14.3 120 Parker Peak 9400 28.5 21.6 132 28.5 20.7 138 Sylvan Lake 8420 19.4 18.4 105 31.1 25.9 120 Thumb Divide 7980 13.1 9.7 135 21.8 21.5 101 Two Ocean Plateau 9240 33.5 29.8 112 29.8 30.8 97 White Mill 8700 27.8 24.3 114 24.5 27.0 91 Wolverine 7650 1.5 .5 300* 15.2 14.2 107 Younts Peak 8350 -M 15.6 * -M 18.3 * ----- ----- Basin Index (%) 117 109 WIND RIVER Burroughs Creek 8750 8.3 -M * 16.8 -M * Castle Creek 8400 .0 -M * 8.6 -M * Cold Springs 9630 3.7 1.6 231 11.2 13.1 85 Deer Park 9700 15.2 14.7 103 22.2 24.2 92 Hobbs Park 10100 17.4 15.9 109 16.2 17.4 93 Kirwin 9550 9.6 10.8 89 13.6 14.5 94 Little Warm 9370 8.1 7.1 114 11.2 15.9 70 Owl Creek 8975 .1 .5 20* 9.1 8.4 108 South Pass 9040 12.7 13.1 97 15.7 21.0 75 St. Lawrence Alt 8620 -M 1.5 * -M 12.1 * Togwotee Pass 9580 25.7 25.0 103 28.8 28.1 102 Townsend Creek 8700 8.7 5.2 167 14.8 15.5 95 ----- ----- Basin Index (%) 108 90 BIGHORN BASIN Bald Mtn. 9380 18.5 20.4 91 15.3 20.4 75 Bear Trap Meadow 8200 .0 .2 0* 8.6 11.3 76 Bone Springs Div 9350 15.4 16.4 94 14.8 19.0 78 Grave Springs 8550 6.3 8.5 74 11.1 13.6 82 Kirwin 9550 9.6 10.8 89 13.6 14.5 94 Marquette 8760 6.7 -M * 11.7 -M * Middle Powder 7760 5.3 11.2 47 10.9 14.8 74 Owl Creek 8975 .1 .5 20* 9.1 8.4 108 Powder River Pass 9480 7.2 9.0 80 -M 15.8 * Shell Creek 9580 15.2 16.4 93 12.6 17.0 74 Timber Creek 7950 .1 1.9 5 9.0 10.6 85 ----- ----- Basin Index (%) 82 81 SHOSHONE RIVER Blackwater 9780 29.0 25.5 114 29.7 24.2 123 Evening Star 9200 28.6 25.1 114 34.4 31.3 110 Marquette 8760 6.7 -M * 11.7 -M * Sylvan Lake 8420 19.4 18.4 105 31.1 25.9 120 Sylvan Road 7120 .0 2.9 0 18.9 19.0 99 Younts Peak 8350 -M 15.6 * -M 18.3 * ----- ----- Basin Index (%) 107 114 POWDER RIVER Bear Trap Meadow 8200 .0 .2 0* 8.6 11.3 76 Cloud Peak Reservoir 9860 13.1 16.5 79 13.4 17.5 77 Grave Springs 8550 6.3 8.5 74 11.1 13.6 82 Hansen Sawmill 8360 2.8 1.5 187 10.0 11.4 88 Middle Powder 7760 5.3 11.2 47 10.9 14.8 74 Powder River Pass 9480 7.2 9.0 80 -M 15.8 * Soldier Park 8720 .9 -M * 9.1 -M * ----- ----- Basin Index (%) 74 79 TONGUE RIVER Big Goose 7990 7.7 10.1 76 12.8 15.1 85 Bone Springs Div 9350 15.4 16.4 94 14.8 19.0 78 Burgess Junction 7880 8.1 11.4 71 10.6 15.5 68 Dome Lake 8880 7.4 11.2 66 11.5 17.2 67 Little Goose 8870 10.0 -M * 10.1 -M * Sucker Creek 8880 10.5 12.1 87 12.5 18.3 68 Tie Creek 6870 1.1 2.1 52 13.8 15.1 91 ----- ----- Basin Index (%) 79 76 BELLE FOURCHE Blind Park 6890 .0 .0 * 9.4 14.9 63 Cole Canyon 5910 .0 .0 * 14.9 12.9 116 ----- ----- Basin Index (%) * 87 CHEYENNE RIVER BASIN Blind Park 6890 .0 .0 * 9.4 14.9 63 North Rapid Creek 6130 .0 .0 * -M 12.9 * ----- ----- Basin Index (%) * 63 UPPER N. PLATTE Arapaho Ridge 10960 24.8 22.3 111 29.8 26.9 111 Blackhall Mtn 9820 33.2 -M * 38.4 -M * Columbine 9160 14.9 15.1 99 32.4 29.3 111 Divide Peak 8880 13.8 16.3 85 27.3 25.0 109 Joe Wright 10120 21.9 22.9 96 34.3 30.8 111 Laprele Creek 8375 4.7 4.6 102 16.7 15.6 107 Med Bow 10500 41.5 -M * 40.6 -M * Never Summer 10280 25.0 22.0 114 22.7 -M * North French Creek 10130 31.7 32.8 97 34.9 31.6 110 Old Battle 10000 40.3 35.8 113 42.1 40.2 105 Rawah 9020 5.6 3.8 147 20.2 17.8 113 Sage Creek Basin 7850 5.6 .2 2800* 19.1 16.6 115 Sand Lake 10050 32.4 31.8 102 29.2 29.9 98 South Brush Creek 8440 .0 6.7 0 14.9 18.5 81 Tower 10500 54.8 51.3 107 52.3 45.9 114 Webber Springs 9250 22.5 20.5 110 35.4 30.6 116 Whiskey Park 8950 -M 27.1 * -M 32.3 * Willow Creek Pass 9540 17.6 14.3 123 20.8 16.2 128 Zirkel 9340 24.8 20.2 123 42.5 31.8 134 ----- ----- Basin Index (%) 106 111 SWEETWATER Deer Park 9700 15.2 14.7 103 22.2 24.2 92 Larsen Creek 9000 .5 7.4 7 16.5 -M * South Pass 9040 12.7 13.1 97 15.7 21.0 75 ----- ----- Basin Index (%) 81 84 LOWER N. PLATTE Casper Mtn. 7900 9.3 11.9 78 15.0 18.9 79 Laprele Creek 8375 4.7 4.6 102 16.7 15.6 107 Reno Hill 8400 13.9 11.8 118 20.8 19.7 106 Windy Peak 7900 2.7 2.0 135 13.7 13.5 101 ----- ----- Basin Index (%) 101 98 LARAMIE RIVER Brooklyn Lake 10240 23.3 22.2 105 30.4 25.5 119 Cinnabar Park 9574 18.3 18.1 101 27.5 27.9 99 Crow Creek 8330 .0 .0 * 13.2 14.1 94 Deadman Hill 10220 21.9 18.9 116 23.6 21.3 111 Rawah 9020 5.6 3.8 147 20.2 17.8 113 Roach 9700 14.5 16.6 87 25.8 23.0 112 Windy Peak 7900 2.7 2.0 135 13.7 13.5 101 ----- ----- Basin Index (%) 106 108 S. PLATTE Black Mountain 8920 6.3 -M * 17.0 -M * Crow Creek 8330 .0 .0 * 13.2 14.1 94 Deadman Hill 10220 21.9 18.9 116 23.6 21.3 111 ----- ----- Basin Index (%) 116* 104 LITTLE SNAKE RIVER Battle Mountain 7440 .0 .0 * 19.9 17.5 114 Divide Peak 8880 13.8 16.3 85 27.3 25.0 109 Elk River 8700 11.0 10.1 109 23.1 23.4 99 Little Snake River 8915 25.0 21.0 119 43.0 33.7 128 Old Battle 10000 40.3 35.8 113 42.1 40.2 105 Sage Creek Basin 7850 5.6 .2 2800* 19.1 16.6 115 Sandstone RS 8150 5.6 3.2 175 21.9 21.3 103 Whiskey Park 8950 -M 27.1 * -M 32.3 * ----- ----- Basin Index (%) 117 111 UPPER GREEN RIVER Big Sandy Opening 9080 12.4 8.7 143 17.5 15.8 111 Blind Bull Sum 8650 23.8 22.6 105 21.4 21.9 98 East Rim Divide 7930 .0 6.9 0 14.1 13.3 106 Elkhart Park G.S. 9400 13.7 10.0 137 17.0 15.6 109 Gros Ventre Summit 8750 6.1 10.2 60 14.7 15.1 97 Gunsight Pass 9820 15.3 11.7 131 18.9 16.5 115 Indian Creek 9425 19.7 21.3 92 20.5 25.6 80 Kendall R.S. 7740 3.0 .7 429* 13.9 15.9 87 Loomis Park 8240 10.3 8.4 123 19.6 19.5 101 New Fork Lake 8340 4.1 4.0 102 12.1 12.6 96 Pocket Creek 9360 13.9 -M * 17.5 -M * Snider Basin 8060 .3 7.9 4 15.0 16.0 94 Spring Creek Divide 9000 23.4 24.1 97 26.5 26.8 99 Triple Peak 8500 18.4 15.4 119 29.1 28.7 101 ----- ----- Basin Index (%) 99 99 LOWER GREEN RIVER Blacks Fork Jct 8869 2.1 -M * 15.8 -M * Buck Pasture 9632 13.5 -M * 23.9 -M * EF Blacks Fork GS 9360 5.7 -M * 14.9 -M * Hams Fork 7840 .0 .5 0* 13.8 13.5 102 Hewinta 9500 4.9 3.4 144 18.1 16.8 108 Hickerson Park 9122 1.6 1.8 89 14.1 12.5 113 Hole-in-Rock 9168 .2 1.0 20 13.5 12.0 112 Indian Creek 9425 19.7 21.3 92 20.5 25.6 80 Kelley R.S. 8180 8.7 9.2 95 18.3 20.7 88 Spirit Lk 10235 13.5 -M * 19.9 -M * Steel Creek Park 10158 16.9 17.6 96 22.7 19.8 115 ----- ----- Basin Index (%) 95 100 UPPER BEAR RIVER Bear River RS 8777 .0 -M * 17.9 -M * Bug Lake 7987 17.1 12.8 134 27.2 22.3 122 Burts Miller Ranch 8000 -M -M * 10.3 -M * Chalk Creek #1 9171 21.9 22.5 97 33.5 29.3 114 Hayden Fork 9130 8.0 7.1 113 27.1 24.5 111 Kelley R.S. 8180 8.7 9.2 95 18.3 20.7 88 Lily Lake 9133 7.8 7.8 100 19.4 20.2 96 Monte Cristo 8932 30.2 23.3 130 36.1 30.1 120 Salt River Summit 7640 6.8 6.2 110 18.8 18.8 100 Spring Creek Divide 9000 23.4 24.1 97 26.5 26.8 99 ----- ----- Basin Index (%) 110 107 ----------------------------------------------------------------------------- -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.