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 WEDNESDAY: MAY 9 , 2018 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 7.2 5.0 144 25.7 23.6 109 Black Bear 8170 46.2 36.8 126 46.8 42.9 109 Blind Bull Sum 8650 -M 22.5 * 22.6 22.1 102 Cottonwood Creek 7670 11.4 13.1 87 30.8 28.6 108 East Rim Divide 7930 .0 6.2 0 14.2 13.5 105 Grand Targhee 9260 52.7 46.4 114 39.3 35.9 109 Granite Creek 6770 4.7 5.9 80 24.6 22.0 112 Grassy Lake 7265 22.7 26.4 86 41.0 40.4 101 Gros Ventre Summit 8750 10.5 9.8 107 17.4 15.3 114 Gunsight Pass 9820 14.1 11.9 118 19.5 16.8 116 Lewis Lake Divide 7850 39.1 29.5 133 -M 39.6 * Phillips Bench 8200 25.4 23.3 109 33.0 31.7 104 Salt River Summit 7640 .0 5.1 0 14.8 19.0 78 Snake River Station 6920 1.9 3.1 61 27.3 25.5 107 Spring Creek Divide 9000 23.2 23.8 97 27.8 27.0 103 Thumb Divide 7980 9.3 8.9 104 22.3 21.7 103 Togwotee Pass 9580 31.7 25.3 125 38.5 28.4 136 Two Ocean Plateau 9240 37.9 29.7 128 34.8 31.1 112 Willow Creek 8080 24.4 21.3 115 42.0 39.0 108 Younts Peak 8350 -M 15.5 * -M 18.4 * ----- ----- Basin Index (%) 109 108 MADISON-GALLATIN Black Bear 8170 46.2 36.8 126 46.8 42.9 109 Canyon 7870 12.0 7.7 156 22.0 18.8 117 Madison Plateau 7750 26.1 20.4 128 32.1 29.9 107 West Yellowstone 6700 .0 .0 * 20.2 16.6 122 Whiskey Creek 6800 13.0 11.1 117 23.4 23.0 102 ----- ----- Basin Index (%) 128 110 YELLOWSTONE Beartooth Lake 9360 37.3 23.0 162 39.4 23.0 171 Burnt Mtn 5880 .0 .0 * 18.6 17.0 109 Canyon 7870 12.0 7.7 156 22.0 18.8 117 Cole Creek 7850 14.3 17.1 84 15.3 17.8 86 Evening Star 9200 40.0 25.3 158 48.8 31.7 154 Fisher Creek 9100 55.4 34.0 163 52.4 36.5 144 Northeast Entrance 7350 2.3 1.0 230 20.8 14.5 143 Parker Peak 9400 35.0 21.8 161 33.8 21.1 160 Sylvan Lake 8420 21.7 18.1 120 32.1 26.2 123 Thumb Divide 7980 9.3 8.9 104 22.3 21.7 103 Two Ocean Plateau 9240 37.9 29.7 128 34.8 31.1 112 White Mill 8700 40.4 24.6 164 36.1 27.4 132 Wolverine 7650 10.0 .4 2500* 23.9 14.5 165 ----- ----- Basin Index (%) 149 133 WIND RIVER Burroughs Creek 8750 7.2 -M * 20.7 -M * Castle Creek 8400 .0 -M * 11.7 -M * Cold Springs 9630 .0 1.7 0 11.6 13.3 87 Deer Park 9700 9.3 14.5 64 18.9 24.4 77 Hobbs Park 10100 14.9 15.9 94 17.4 17.7 98 Kirwin 9550 15.9 10.9 146 20.8 14.7 141 Little Warm 9370 10.6 6.7 158 19.6 16.1 122 Owl Creek 8975 -M .6 * 8.7 8.5 102 South Pass 9040 6.3 12.2 52 11.3 21.2 53 St. Lawrence Alt 8620 .0 1.4 0 9.6 12.3 78 Togwotee Pass 9580 31.7 25.3 125 38.5 28.4 136 Townsend Creek 8700 .0 4.4 0 11.8 15.7 75 ----- ----- Basin Index (%) 95 98 BIGHORN BASIN Bald Mtn. 9380 22.0 20.5 107 19.9 20.9 95 Bear Trap Meadow 8200 .0 .2 0* 12.4 11.5 108 Bone Springs Div 9350 19.4 16.5 118 18.6 19.5 95 Grave Springs 8550 3.7 7.9 47 6.8 13.9 49 Kirwin 9550 15.9 10.9 146 20.8 14.7 141 Marquette 8760 3.6 -M * 13.4 -M * Middle Powder 7760 3.8 11.0 35 8.2 15.2 54 Owl Creek 8975 -M .6 * 8.7 8.5 102 Powder River Pass 9480 11.9 9.0 132 18.3 16.1 114 Shell Creek 9580 21.0 16.7 126 19.1 17.5 109 Timber Creek 7950 .0 1.7 0 -M 10.8 * ----- ----- Basin Index (%) 103 96 SHOSHONE RIVER Blackwater 9780 -M 25.0 * 36.4 24.4 149 Evening Star 9200 40.0 25.3 158 48.8 31.7 154 Marquette 8760 3.6 -M * 13.4 -M * Sylvan Road 7120 .1 1.9 5 25.0 19.2 130 Younts Peak 8350 -M 15.5 * -M 18.4 * ----- ----- Basin Index (%) 147* 146 POWDER RIVER Bear Trap Meadow 8200 .0 .2 0* 12.4 11.5 108 Cloud Peak Reservoir 9860 14.6 16.7 87 18.4 18.0 102 Grave Springs 8550 3.7 7.9 47 6.8 13.9 49 Hansen Sawmill 8360 2.1 1.4 150 13.4 11.8 114 Middle Powder 7760 3.8 11.0 35 8.2 15.2 54 Powder River Pass 9480 11.9 9.0 132 18.3 16.1 114 Soldier Park 8720 .8 -M * 13.1 -M * ----- ----- Basin Index (%) 78 90 TONGUE RIVER Big Goose 7990 5.3 10.4 51 12.0 15.6 77 Bone Springs Div 9350 19.4 16.5 118 18.6 19.5 95 Burgess Junction 7880 8.8 11.5 77 11.5 15.9 72 Dome Lake 8880 11.3 11.2 101 16.1 17.8 90 Little Goose 8870 6.6 -M * 15.9 -M * Sucker Creek 8880 7.1 12.5 57 12.8 18.8 68 Tie Creek 6870 .1 1.7 6 12.3 15.7 78 ----- ----- Basin Index (%) 82 81 BELLE FOURCHE Cole Canyon 5910 .0 .0 * 13.0 13.4 97 ----- ----- Basin Index (%) * 97 CHEYENNE RIVER BASIN Blind Park 6890 .0 .0 * 14.1 15.3 92 North Rapid Creek 6130 .0 .0 * 12.0 13.2 91 ----- ----- Basin Index (%) * 92 UPPER N. PLATTE Arapaho Ridge 10960 19.8 22.4 88 25.4 27.3 93 Blackhall Mtn 9820 22.2 -M * 30.6 -M * Columbine 9160 10.3 13.5 76 29.6 29.5 100 Divide Peak 8880 .5 14.9 3 20.4 25.4 80 Joe Wright 10120 20.6 23.0 90 35.8 31.2 115 Laprele Creek 8375 .1 3.4 3 10.3 16.0 64 Med Bow 10500 42.3 -M * 38.9 -M * North French Creek 10130 25.7 32.8 78 31.9 32.2 99 Never Summer 10280 21.5 22.1 97 20.7 -M * Old Battle 10000 25.6 36.6 70 27.6 40.7 68 Rawah 9020 2.0 3.0 67 18.4 18.0 102 Sage Creek Basin 7850 -M .0 * 11.6 16.8 69 Sand Lake 10050 27.4 31.8 86 27.1 30.3 89 South Brush Creek 8440 .0 5.8 0 14.1 18.9 75 Tower 10500 41.7 51.4 81 42.7 46.2 92 Webber Springs 9250 9.8 19.8 49 24.4 31.0 79 Willow Creek Pass 9540 13.2 13.7 96 17.7 16.4 108 Zirkel 9340 9.2 19.9 46 35.1 32.2 109 ----- ----- Basin Index (%) 72 90 SWEETWATER Deer Park 9700 9.3 14.5 64 18.9 24.4 77 Larsen Creek 9000 .0 6.8 0 13.0 -M * South Pass 9040 6.3 12.2 52 11.3 21.2 53 ----- ----- Basin Index (%) 47 66 LOWER N. PLATTE Casper Mtn. 7900 -M 11.7 * 9.1 19.3 47 Laprele Creek 8375 .1 3.4 3 10.3 16.0 64 Reno Hill 8400 3.5 11.0 32 14.3 20.0 72 Windy Peak 7900 .1 1.2 8 10.6 13.8 77 ----- ----- Basin Index (%) 24 64 LARAMIE RIVER Brooklyn Lake 10240 19.2 21.7 88 29.1 25.9 112 Cinnabar Park 9574 14.5 17.8 81 27.8 28.2 99 Crow Creek 8330 .0 .0 * 13.7 14.2 96 Deadman Hill 10220 19.9 18.6 107 23.7 21.6 110 Rawah 9020 2.0 3.0 67 18.4 18.0 102 Roach 9700 10.3 16.2 64 20.9 23.2 90 ----- ----- Basin Index (%) 85 102 S. PLATTE Black Mountain 8920 2.8 -M * 16.4 -M * Crow Creek 8330 .0 .0 * 13.7 14.2 96 Deadman Hill 10220 19.9 18.6 107 23.7 21.6 110 ----- ----- Basin Index (%) 107* 104 LITTLE SNAKE RIVER Battle Mountain 7440 .0 .0 * 13.1 17.8 74 Divide Peak 8880 .5 14.9 3 20.4 25.4 80 Elk River 8700 .0 8.6 0 19.3 23.6 82 Little Snake River 8915 10.0 20.7 48 31.1 34.3 91 Old Battle 10000 25.6 36.6 70 27.6 40.7 68 Sage Creek Basin 7850 -M .0 * 11.6 16.8 69 Sandstone RS 8150 -M 2.2 * 12.0 21.7 55 Whiskey Park 8950 17.2 26.9 64 29.1 32.8 89 ----- ----- Basin Index (%) 49 77 UPPER GREEN RIVER Big Sandy Opening 9080 5.3 8.6 62 14.8 16.0 92 Blind Bull Sum 8650 -M 22.5 * 22.6 22.1 102 East Rim Divide 7930 .0 6.2 0 14.2 13.5 105 Elkhart Park G.S. 9400 5.8 9.7 60 13.6 15.8 86 Gros Ventre Summit 8750 10.5 9.8 107 17.4 15.3 114 Gunsight Pass 9820 14.1 11.9 118 19.5 16.8 116 Kendall R.S. 7740 .1 .0 * 17.3 16.1 107 Loomis Park 8240 7.5 7.6 99 20.9 19.7 106 New Fork Lake 8340 .0 3.0 0 13.5 12.7 106 Pocket Creek 9360 4.9 -M * 10.7 -M * Snider Basin 8060 .0 7.5 0 16.1 16.1 100 Spring Creek Divide 9000 23.2 23.8 97 27.8 27.0 103 Triple Peak 8500 21.4 15.1 142 35.6 29.0 123 ----- ----- Basin Index (%) 85 106 LOWER GREEN RIVER Blacks Fork Jct 8869 .0 -M * 11.2 -M * Buck Pasture 9632 3.9 -M * 16.8 -M * EF Blacks Fork GS 9360 -M -M * 9.1 -M * Hams Fork 7840 .0 .2 0* 12.0 13.7 88 Hewinta 9500 .0 2.4 0 14.1 17.0 83 Hickerson Park 9122 .4 .5 80* 10.4 12.7 82 Hole-in-Rock 9168 .0 .3 0* 11.2 12.2 92 Indian Creek 9425 15.2 21.0 72 18.8 25.9 73 Kelley R.S. 8180 2.8 8.6 33 16.9 20.9 81 Spirit Lk 10235 4.2 -M * 15.1 -M * Steel Creek Park 10158 14.1 17.8 79 17.8 20.0 89 ----- ----- Basin Index (%) 64* 83 UPPER BEAR RIVER Bear River RS 8777 .0 -M * 12.0 -M * Bug Lake 7987 2.5 12.4 20 18.7 22.4 83 Burts Miller Ranch 8000 .0 -M * 6.9 -M * Chalk Creek #1 9171 2.8 21.9 13 18.4 29.6 62 Hayden Fork 9130 .1 6.3 2 18.6 24.7 75 Kelley R.S. 8180 2.8 8.6 33 16.9 20.9 81 Lily Lake 9133 .0 6.2 0 13.2 20.4 65 Monte Cristo 8932 13.6 22.0 62 25.4 30.4 84 Salt River Summit 7640 .0 5.1 0 14.8 19.0 78 ----- ----- Basin Index (%) 26 75 ----------------------------------------------------------------------------- -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.