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 SATURDAY: MAY 12 , 2018 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 4.6 3.3 139 25.8 23.8 108 Black Bear 8170 45.8 36.8 124 47.4 43.4 109 Blind Bull Sum 8650 -M 22.4 * 23.5 22.5 104 Cottonwood Creek 7670 9.4 12.1 78 31.6 29.1 109 East Rim Divide 7930 .1 5.4 2 14.9 13.7 109 Grand Targhee 9260 49.1 46.1 107 39.6 36.3 109 Granite Creek 6770 2.3 4.0 58 24.9 22.3 112 Grassy Lake 7265 19.2 24.6 78 41.2 40.8 101 Gros Ventre Summit 8750 9.0 9.4 96 17.7 15.5 114 Gunsight Pass 9820 13.5 12.3 110 20.2 17.2 117 Lewis Lake Divide 7850 36.0 28.5 126 45.3 40.0 113 Phillips Bench 8200 23.6 22.8 104 33.4 32.2 104 Salt River Summit 7640 .0 3.2 0 15.3 19.3 79 Snake River Station 6920 .0 1.1 0* 27.7 25.7 108 Spring Creek Divide 9000 22.4 23.3 96 28.6 27.4 104 Thumb Divide 7980 6.2 7.4 84 22.6 22.0 103 Togwotee Pass 9580 31.4 25.3 124 39.0 28.8 135 Two Ocean Plateau 9240 37.5 29.5 127 35.0 31.8 110 Willow Creek 8080 21.3 20.6 103 43.3 39.6 109 Younts Peak 8350 -M 14.9 * -M 18.8 * ----- ----- Basin Index (%) 105 109 MADISON-GALLATIN Black Bear 8170 45.8 36.8 124 47.4 43.4 109 Canyon 7870 10.0 6.7 149 22.2 19.1 116 Madison Plateau 7750 23.9 19.0 126 32.5 30.2 108 West Yellowstone 6700 .0 .0 * 20.4 16.8 121 Whiskey Creek 6800 11.3 9.9 114 23.4 23.3 100 ----- ----- Basin Index (%) 126 110 YELLOWSTONE Beartooth Lake 9360 37.5 22.9 164 39.4 23.3 169 Burnt Mtn 5880 .4 .0 * 19.1 18.4 104 Canyon 7870 10.0 6.7 149 22.2 19.1 116 Cole Creek 7850 14.3 17.2 83 16.5 18.6 89 Evening Star 9200 38.2 25.6 149 48.9 32.1 152 Fisher Creek 9100 53.4 34.4 155 52.6 36.9 143 Northeast Entrance 7350 .0 .6 0* 20.8 14.8 141 Parker Peak 9400 32.4 22.1 147 33.8 21.5 157 Sylvan Lake 8420 18.8 17.8 106 32.4 26.6 122 Thumb Divide 7980 6.2 7.4 84 22.6 22.0 103 Two Ocean Plateau 9240 37.5 29.5 127 35.0 31.8 110 White Mill 8700 39.6 24.9 159 35.7 27.8 128 Wolverine 7650 6.3 .0 * 23.9 14.9 160 ----- ----- Basin Index (%) 141 131 WIND RIVER Burroughs Creek 8750 5.3 -M * 20.8 -M * Castle Creek 8400 .0 -M * 12.1 -M * Cold Springs 9630 .6 1.0 60 12.1 13.8 88 Deer Park 9700 9.8 14.3 69 20.2 25.3 80 Hobbs Park 10100 14.6 15.8 92 18.4 18.3 101 Kirwin 9550 14.9 10.8 138 21.0 15.1 139 Little Warm 9370 9.3 6.6 141 19.8 16.6 119 Owl Creek 8975 .2 .4 50* 9.5 9.0 106 South Pass 9040 5.6 11.2 50 12.5 21.8 57 St. Lawrence Alt 8620 .5 .6 83* 10.6 12.9 82 Togwotee Pass 9580 31.4 25.3 124 39.0 28.8 135 Townsend Creek 8700 .8 2.8 29 13.0 16.3 80 ----- ----- Basin Index (%) 99 99 BIGHORN BASIN Bald Mtn. 9380 21.2 20.8 102 20.0 21.4 93 Bear Trap Meadow 8200 .0 .0 * 12.6 11.9 106 Bone Springs Div 9350 18.4 16.5 112 18.9 20.0 94 Grave Springs 8550 2.0 7.3 27 7.1 14.5 49 Kirwin 9550 14.9 10.8 138 21.0 15.1 139 Marquette 8760 3.0 -M * 14.9 -M * Middle Powder 7760 1.2 10.2 12 8.5 15.6 54 Owl Creek 8975 .2 .4 50* 9.5 9.0 106 Powder River Pass 9480 10.9 8.9 122 18.4 16.5 112 Shell Creek 9580 20.0 16.8 119 19.2 17.8 108 Timber Creek 7950 1.2 1.1 109 -M 11.4 * ----- ----- Basin Index (%) 97 95 SHOSHONE RIVER Blackwater 9780 32.3 24.5 132 36.5 24.9 147 Evening Star 9200 38.2 25.6 149 48.9 32.1 152 Marquette 8760 3.0 -M * 14.9 -M * Sylvan Road 7120 .1 .7 14* 25.2 19.5 129 Younts Peak 8350 -M 14.9 * -M 18.8 * ----- ----- Basin Index (%) 139* 145 POWDER RIVER Bear Trap Meadow 8200 .0 .0 * 12.6 11.9 106 Cloud Peak Reservoir 9860 14.2 16.7 85 19.4 18.6 104 Grave Springs 8550 2.0 7.3 27 7.1 14.5 49 Hansen Sawmill 8360 .7 .6 117* 13.8 12.2 113 Middle Powder 7760 1.2 10.2 12 8.5 15.6 54 Powder River Pass 9480 10.9 8.9 122 18.4 16.5 112 Soldier Park 8720 .6 -M * 13.5 -M * ----- ----- Basin Index (%) 66 89 TONGUE RIVER Big Goose 7990 4.0 10.0 40 12.2 16.3 75 Bone Springs Div 9350 18.4 16.5 112 18.9 20.0 94 Burgess Junction 7880 7.7 11.3 68 11.5 16.3 71 Dome Lake 8880 10.4 10.9 95 17.2 18.3 94 Little Goose 8870 5.6 -M * 16.5 -M * Sucker Creek 8880 5.7 12.5 46 13.1 19.3 68 Tie Creek 6870 .1 .9 11 12.9 16.4 79 ----- ----- Basin Index (%) 75 80 BELLE FOURCHE Cole Canyon 5910 .1 .0 * 12.8 14.0 91 ----- ----- Basin Index (%) * 91 CHEYENNE RIVER BASIN Blind Park 6890 .0 .0 * 14.5 15.9 91 North Rapid Creek 6130 .0 .0 * 12.7 14.0 91 ----- ----- Basin Index (%) * 91 UPPER N. PLATTE Arapaho Ridge 10960 17.7 22.3 79 25.5 27.9 91 Blackhall Mtn 9820 19.4 -M * 30.7 -M * Columbine 9160 6.7 11.2 60 29.7 29.8 100 Divide Peak 8880 .0 13.0 0 20.5 25.7 80 Joe Wright 10120 18.1 23.2 78 35.9 31.7 113 Laprele Creek 8375 .2 1.1 18 10.4 16.3 64 Med Bow 10500 39.2 -M * 39.0 -M * North French Creek 10130 23.0 32.5 71 31.9 32.7 98 Never Summer 10280 20.1 22.2 91 20.7 -M * Old Battle 10000 24.1 36.8 65 27.5 41.1 67 Rawah 9020 .2 2.1 10 18.4 18.6 99 Sage Creek Basin 7850 -M .0 * 11.7 17.0 69 Sand Lake 10050 25.8 31.6 82 27.1 30.9 88 South Brush Creek 8440 .0 3.6 0 14.1 19.3 73 Tower 10500 37.4 50.9 73 42.8 46.8 91 Webber Springs 9250 7.2 18.4 39 24.4 31.3 78 Willow Creek Pass 9540 11.3 12.6 90 17.7 16.6 107 Zirkel 9340 5.2 18.9 28 35.1 32.9 107 ----- ----- Basin Index (%) 66 89 SWEETWATER Deer Park 9700 9.8 14.3 69 20.2 25.3 80 Larsen Creek 9000 .3 5.9 5 14.0 -M * South Pass 9040 5.6 11.2 50 12.5 21.8 57 ----- ----- Basin Index (%) 50 69 LOWER N. PLATTE Casper Mtn. 7900 .0 10.8 0 9.3 19.7 47 Laprele Creek 8375 .2 1.1 18 10.4 16.3 64 Reno Hill 8400 .8 9.4 9 15.3 20.6 74 Windy Peak 7900 .2 .0 * 11.2 14.0 80 ----- ----- Basin Index (%) 6 65 LARAMIE RIVER Brooklyn Lake 10240 16.3 20.8 78 29.2 26.2 111 Cinnabar Park 9574 12.1 16.7 72 27.8 28.8 97 Crow Creek 8330 .0 .0 * 13.8 14.6 95 Deadman Hill 10220 16.7 18.5 90 23.8 22.0 108 Rawah 9020 .2 2.1 10 18.4 18.6 99 Roach 9700 8.1 15.0 54 20.8 23.6 88 ----- ----- Basin Index (%) 73 100 S. PLATTE Black Mountain 8920 -M -M * 16.5 -M * Crow Creek 8330 .0 .0 * 13.8 14.6 95 Deadman Hill 10220 16.7 18.5 90 23.8 22.0 108 ----- ----- Basin Index (%) 90* 103 LITTLE SNAKE RIVER Battle Mountain 7440 .0 .0 * 13.2 18.1 73 Divide Peak 8880 .0 13.0 0 20.5 25.7 80 Elk River 8700 .0 6.2 0 19.3 24.0 80 Little Snake River 8915 6.8 19.8 34 31.2 34.6 90 Old Battle 10000 24.1 36.8 65 27.5 41.1 67 Sage Creek Basin 7850 -M .0 * 11.7 17.0 69 Sandstone RS 8150 -M .8 * 11.8 22.0 54 Whiskey Park 8950 11.4 26.0 44 29.2 33.2 88 ----- ----- Basin Index (%) 42 76 UPPER GREEN RIVER Big Sandy Opening 9080 4.3 8.5 51 15.6 16.3 96 Blind Bull Sum 8650 -M 22.4 * 23.5 22.5 104 East Rim Divide 7930 .1 5.4 2 14.9 13.7 109 Elkhart Park G.S. 9400 5.0 9.4 53 14.4 16.2 89 Gros Ventre Summit 8750 9.0 9.4 96 17.7 15.5 114 Gunsight Pass 9820 13.5 12.3 110 20.2 17.2 117 Kendall R.S. 7740 .1 .0 * 18.2 16.3 112 Loomis Park 8240 5.7 6.7 85 21.4 20.0 107 New Fork Lake 8340 .0 2.1 0 13.7 13.0 105 Pocket Creek 9360 3.9 -M * 11.2 -M * Snider Basin 8060 .0 6.9 0 16.8 16.4 102 Spring Creek Divide 9000 22.4 23.3 96 28.6 27.4 104 Triple Peak 8500 18.6 14.2 131 36.7 29.4 125 ----- ----- Basin Index (%) 80 108 LOWER GREEN RIVER Blacks Fork Jct 8869 .1 -M * 12.0 -M * Buck Pasture 9632 2.4 -M * 17.9 -M * EF Blacks Fork GS 9360 -M -M * 10.2 -M * Hams Fork 7840 .0 .0 * 12.7 14.0 91 Hewinta 9500 .1 1.1 9 15.1 17.3 87 Hickerson Park 9122 1.9 .0 * 12.2 13.0 94 Hole-in-Rock 9168 .0 .0 * 12.9 12.5 103 Indian Creek 9425 14.3 21.2 67 19.4 26.4 73 Kelley R.S. 8180 .8 7.8 10 17.5 21.3 82 Spirit Lk 10235 4.1 -M * 16.9 -M * Steel Creek Park 10158 13.8 17.4 79 19.0 20.4 93 ----- ----- Basin Index (%) 65* 87 UPPER BEAR RIVER Bear River RS 8777 .0 -M * 12.7 -M * Bug Lake 7987 .2 11.7 2 19.1 22.9 83 Burts Miller Ranch 8000 .6 -M * 7.2 -M * Chalk Creek #1 9171 .5 20.7 2 19.2 30.1 64 Hayden Fork 9130 .2 5.0 4 19.4 25.2 77 Kelley R.S. 8180 .8 7.8 10 17.5 21.3 82 Lily Lake 9133 .0 3.6 0 13.9 20.8 67 Monte Cristo 8932 12.2 20.6 59 25.8 30.9 83 Salt River Summit 7640 .0 3.2 0 15.3 19.3 79 ----- ----- Basin Index (%) 19 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.