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 8 , 2018 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 8.3 5.5 151 25.7 23.5 109 Black Bear 8170 46.8 36.9 127 46.9 42.8 110 Blind Bull Sum 8650 -M 22.6 * 22.6 22.0 103 Cottonwood Creek 7670 12.7 13.3 95 30.8 28.6 108 East Rim Divide 7930 .0 6.6 0 14.2 13.4 106 Grand Targhee 9260 54.0 46.4 116 39.2 35.9 109 Granite Creek 6770 5.9 6.3 94 24.6 21.9 112 Grassy Lake 7265 23.9 26.7 90 41.1 40.3 102 Gros Ventre Summit 8750 11.3 10.0 113 17.5 15.2 115 Gunsight Pass 9820 14.9 11.8 126 19.5 16.7 117 Lewis Lake Divide 7850 39.8 29.5 135 -M 39.5 * Phillips Bench 8200 26.2 23.4 112 33.0 31.6 104 Salt River Summit 7640 .0 5.7 0 14.9 18.9 79 Snake River Station 6920 3.4 3.5 97 27.3 25.4 107 Spring Creek Divide 9000 24.2 24.0 101 27.8 26.9 103 Thumb Divide 7980 10.5 9.4 112 22.3 21.6 103 Togwotee Pass 9580 32.5 25.2 129 38.5 28.3 136 Two Ocean Plateau 9240 38.1 29.7 128 34.8 30.9 113 Willow Creek 8080 26.1 21.5 121 42.0 38.9 108 Younts Peak 8350 -M 15.6 * -M 18.3 * ----- ----- Basin Index (%) 113 108 MADISON-GALLATIN Black Bear 8170 46.8 36.9 127 46.9 42.8 110 Canyon 7870 12.8 8.0 160 22.1 18.6 119 Madison Plateau 7750 27.1 20.6 132 32.0 29.8 107 West Yellowstone 6700 .0 .0 * 20.3 16.5 123 Whiskey Creek 6800 13.5 11.5 117 23.3 22.9 102 ----- ----- Basin Index (%) 130 111 YELLOWSTONE Beartooth Lake 9360 36.9 23.0 160 39.4 22.8 173 Burnt Mtn 5880 .1 .0 * 18.6 16.9 110 Canyon 7870 12.8 8.0 160 22.1 18.6 119 Cole Creek 7850 15.5 17.0 91 15.4 17.5 88 Evening Star 9200 41.0 25.2 163 48.9 31.5 155 Fisher Creek 9100 54.6 33.8 162 52.4 36.3 144 Northeast Entrance 7350 3.6 1.0 360 20.8 14.4 144 Parker Peak 9400 35.6 21.7 164 33.8 20.9 162 Sylvan Lake 8420 24.1 18.2 132 32.1 26.0 123 Thumb Divide 7980 10.5 9.4 112 22.3 21.6 103 Two Ocean Plateau 9240 38.1 29.7 128 34.8 30.9 113 White Mill 8700 40.9 24.5 167 36.1 27.2 133 Wolverine 7650 11.5 .4 2875* 24.0 14.3 168 ----- ----- Basin Index (%) 153 134 WIND RIVER Burroughs Creek 8750 8.3 -M * 20.8 -M * Castle Creek 8400 .1 -M * 11.7 -M * Cold Springs 9630 .0 1.6 0 11.5 13.2 87 Deer Park 9700 10.0 14.6 68 18.8 24.3 77 Hobbs Park 10100 15.6 15.9 98 17.5 17.6 99 Kirwin 9550 16.8 10.8 156 20.9 14.6 143 Little Warm 9370 11.5 6.9 167 19.6 16.1 122 Owl Creek 8975 -M .5 * 8.7 8.4 104 South Pass 9040 7.2 12.6 57 11.3 21.1 54 St. Lawrence Alt 8620 .0 1.4 0 9.6 12.2 79 Togwotee Pass 9580 32.5 25.2 129 38.5 28.3 136 Townsend Creek 8700 .0 4.8 0 12.0 15.6 77 ----- ----- Basin Index (%) 100 98 BIGHORN BASIN Bald Mtn. 9380 22.3 20.4 109 19.9 20.7 96 Bear Trap Meadow 8200 .4 .2 200* 12.4 11.4 109 Bone Springs Div 9350 19.9 16.4 121 18.6 19.3 96 Grave Springs 8550 4.5 8.2 55 6.9 13.7 50 Kirwin 9550 16.8 10.8 156 20.9 14.6 143 Marquette 8760 4.7 -M * 13.4 -M * Middle Powder 7760 5.1 11.1 46 8.1 15.0 54 Owl Creek 8975 -M .5 * 8.7 8.4 104 Powder River Pass 9480 12.7 9.0 141 18.3 16.0 114 Shell Creek 9580 21.5 16.6 130 19.1 17.3 110 Timber Creek 7950 .0 1.8 0 -M 10.7 * ----- ----- Basin Index (%) 109 97 SHOSHONE RIVER Blackwater 9780 35.8 25.2 142 36.4 24.3 150 Evening Star 9200 41.0 25.2 163 48.9 31.5 155 Marquette 8760 4.7 -M * 13.4 -M * Sylvan Road 7120 .1 2.4 4 25.0 19.2 130 Younts Peak 8350 -M 15.6 * -M 18.3 * ----- ----- Basin Index (%) 146 147 POWDER RIVER Bear Trap Meadow 8200 .4 .2 200* 12.4 11.4 109 Cloud Peak Reservoir 9860 14.3 16.6 86 18.4 17.8 103 Grave Springs 8550 4.5 8.2 55 6.9 13.7 50 Hansen Sawmill 8360 3.1 1.5 207 13.4 11.6 116 Middle Powder 7760 5.1 11.1 46 8.1 15.0 54 Powder River Pass 9480 12.7 9.0 141 18.3 16.0 114 Soldier Park 8720 1.5 -M * 13.1 -M * ----- ----- Basin Index (%) 86 91 TONGUE RIVER Big Goose 7990 6.0 10.3 58 12.0 15.4 78 Bone Springs Div 9350 19.9 16.4 121 18.6 19.3 96 Burgess Junction 7880 9.4 11.4 82 11.5 15.7 73 Dome Lake 8880 11.9 11.2 106 16.1 17.5 92 Little Goose 8870 7.1 -M * 15.9 -M * Sucker Creek 8880 7.6 12.3 62 12.8 18.6 69 Tie Creek 6870 .1 1.8 6 12.3 15.5 79 ----- ----- Basin Index (%) 87 82 BELLE FOURCHE Cole Canyon 5910 .0 .0 * 13.0 13.2 98 ----- ----- Basin Index (%) * 98 CHEYENNE RIVER BASIN Blind Park 6890 .0 .0 * 13.8 15.1 91 North Rapid Creek 6130 .0 .0 * 11.6 13.0 89 ----- ----- Basin Index (%) * 90 UPPER N. PLATTE Arapaho Ridge 10960 20.6 22.3 92 25.5 27.0 94 Blackhall Mtn 9820 23.3 -M * 30.7 -M * Columbine 9160 11.9 14.4 83 29.6 29.3 101 Divide Peak 8880 1.8 15.6 12 20.4 25.2 81 Joe Wright 10120 21.2 22.9 93 35.9 30.9 116 Laprele Creek 8375 .1 4.0 2 10.3 15.8 65 Med Bow 10500 43.0 -M * 38.9 -M * North French Creek 10130 26.5 32.8 81 31.9 31.9 100 Never Summer 10280 22.0 22.1 100 20.7 -M * Old Battle 10000 26.2 36.2 72 27.6 40.4 68 Rawah 9020 3.2 3.4 94 18.4 17.9 103 Sage Creek Basin 7850 -M .0 * 11.6 16.7 69 Sand Lake 10050 27.9 31.8 88 27.1 30.1 90 South Brush Creek 8440 .0 6.2 0 14.2 18.7 76 Tower 10500 43.4 51.4 84 42.7 46.1 93 Webber Springs 9250 11.2 20.2 55 24.4 30.8 79 Willow Creek Pass 9540 13.7 14.0 98 17.7 16.3 109 Zirkel 9340 10.5 20.1 52 35.1 32.0 110 ----- ----- Basin Index (%) 76 91 SWEETWATER Deer Park 9700 10.0 14.6 68 18.8 24.3 77 Larsen Creek 9000 .1 7.1 1 13.0 -M * South Pass 9040 7.2 12.6 57 11.3 21.1 54 ----- ----- Basin Index (%) 50 66 LOWER N. PLATTE Casper Mtn. 7900 -M 11.9 * 9.1 19.0 48 Laprele Creek 8375 .1 4.0 2 10.3 15.8 65 Reno Hill 8400 4.6 11.4 40 14.4 19.9 72 Windy Peak 7900 .1 1.6 6 10.6 13.6 78 ----- ----- Basin Index (%) 28 65 LARAMIE RIVER Brooklyn Lake 10240 20.2 21.9 92 29.2 25.7 114 Cinnabar Park 9574 15.3 18.0 85 27.8 28.0 99 Crow Creek 8330 .0 .0 * 13.7 14.1 97 Deadman Hill 10220 20.0 18.7 107 23.8 21.5 111 Rawah 9020 3.2 3.4 94 18.4 17.9 103 Roach 9700 11.1 16.4 68 20.9 23.1 90 ----- ----- Basin Index (%) 89 103 S. PLATTE Black Mountain 8920 4.3 -M * 16.4 -M * Crow Creek 8330 .0 .0 * 13.7 14.1 97 Deadman Hill 10220 20.0 18.7 107 23.8 21.5 111 ----- ----- Basin Index (%) 107* 105 LITTLE SNAKE RIVER Battle Mountain 7440 .0 .0 * 13.5 17.7 76 Divide Peak 8880 1.8 15.6 12 20.4 25.2 81 Elk River 8700 .1 9.3 1 19.2 23.5 82 Little Snake River 8915 11.1 20.9 53 31.2 34.0 92 Old Battle 10000 26.2 36.2 72 27.6 40.4 68 Sage Creek Basin 7850 -M .0 * 11.6 16.7 69 Sandstone RS 8150 .0 2.7 0 12.0 21.5 56 Whiskey Park 8950 18.3 27.0 68 29.2 32.6 90 ----- ----- Basin Index (%) 51 78 UPPER GREEN RIVER Big Sandy Opening 9080 6.5 8.7 75 14.9 15.9 94 Blind Bull Sum 8650 -M 22.6 * 22.6 22.0 103 East Rim Divide 7930 .0 6.6 0 14.2 13.4 106 Elkhart Park G.S. 9400 6.7 9.8 68 13.5 15.7 86 Gros Ventre Summit 8750 11.3 10.0 113 17.5 15.2 115 Gunsight Pass 9820 14.9 11.8 126 19.5 16.7 117 Kendall R.S. 7740 .2 .2 100* 17.2 16.0 108 Loomis Park 8240 8.5 8.0 106 20.9 19.6 107 New Fork Lake 8340 .1 3.5 3 13.4 12.7 106 Pocket Creek 9360 6.0 -M * 10.7 -M * Snider Basin 8060 .0 7.6 0 16.1 16.1 100 Spring Creek Divide 9000 24.2 24.0 101 27.8 26.9 103 Triple Peak 8500 23.1 15.3 151 35.6 28.9 123 ----- ----- Basin Index (%) 91 106 LOWER GREEN RIVER Blacks Fork Jct 8869 .1 -M * 11.3 -M * Buck Pasture 9632 5.2 -M * 16.8 -M * EF Blacks Fork GS 9360 .0 -M * 9.0 -M * Hams Fork 7840 .0 .3 0* 11.9 13.6 88 Hewinta 9500 .0 2.9 0 14.0 16.9 83 Hickerson Park 9122 .4 1.2 33 10.4 12.6 83 Hole-in-Rock 9168 .0 .7 0* 11.2 12.1 93 Indian Creek 9425 16.0 21.1 76 18.7 25.8 72 Kelley R.S. 8180 4.0 8.9 45 17.0 20.8 82 Spirit Lk 10235 5.4 -M * 15.1 -M * Steel Creek Park 10158 14.7 17.7 83 17.8 19.9 89 ----- ----- Basin Index (%) 66* 83 UPPER BEAR RIVER Bear River RS 8777 .0 -M * 12.0 -M * Bug Lake 7987 3.8 12.6 30 18.7 22.4 83 Burts Miller Ranch 8000 .1 -M * 6.9 -M * Chalk Creek #1 9171 4.2 22.2 19 18.4 29.4 63 Hayden Fork 9130 .1 6.6 2 18.6 24.6 76 Kelley R.S. 8180 4.0 8.9 45 17.0 20.8 82 Lily Lake 9133 .0 7.0 0 13.2 20.3 65 Monte Cristo 8932 14.7 22.7 65 25.4 30.3 84 Salt River Summit 7640 .0 5.7 0 14.9 18.9 79 ----- ----- Basin Index (%) 31 76 ----------------------------------------------------------------------------- -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.