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 THURSDAY: MAY 17 , 2018 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 .0 .0 * 26.2 24.2 108 Black Bear 8170 44.4 35.3 126 47.7 44.3 108 Blind Bull Sum 8650 -M 21.5 * 24.4 23.0 106 Cottonwood Creek 7670 6.0 8.9 67 32.3 29.6 109 East Rim Divide 7930 .0 2.6 0 15.7 14.0 112 Grand Targhee 9260 47.2 44.0 107 40.0 36.7 109 Granite Creek 6770 .0 .0 * 26.9 22.7 119 Grassy Lake 7265 15.0 20.4 74 41.6 41.5 100 Gros Ventre Summit 8750 7.3 7.6 96 18.8 15.9 118 Gunsight Pass 9820 13.9 11.7 119 21.4 17.5 122 Lewis Lake Divide 7850 30.5 24.5 124 -M 40.6 * Phillips Bench 8200 22.2 21.0 106 34.1 32.6 105 Salt River Summit 7640 .0 .6 0* 16.0 19.7 81 Snake River Station 6920 .0 .0 * 27.7 26.2 106 Spring Creek Divide 9000 21.0 22.0 95 29.2 27.8 105 Thumb Divide 7980 .8 3.6 22 22.6 22.5 100 Togwotee Pass 9580 30.9 23.8 130 39.6 29.3 135 Two Ocean Plateau 9240 36.2 29.0 125 35.3 32.4 109 Willow Creek 8080 16.3 18.8 87 44.2 40.4 109 Younts Peak 8350 -M 12.9 * -M 19.2 * ----- ----- Basin Index (%) 107 109 MADISON-GALLATIN Black Bear 8170 44.4 35.3 126 47.7 44.3 108 Canyon 7870 7.0 4.2 167 22.2 19.6 113 Madison Plateau 7750 20.9 15.9 131 32.8 31.1 105 West Yellowstone 6700 .0 .0 * 20.7 17.4 119 Whiskey Creek 6800 8.5 7.6 112 23.8 24.0 99 ----- ----- Basin Index (%) 128 108 YELLOWSTONE Beartooth Lake 9360 38.8 22.3 174 39.6 23.9 166 Burnt Mtn 5880 .0 .0 * 19.9 18.9 105 Canyon 7870 7.0 4.2 167 22.2 19.6 113 Cole Creek 7850 12.8 16.8 76 17.5 19.2 91 Evening Star 9200 35.8 24.9 144 49.4 32.9 150 Fisher Creek 9100 57.0 33.6 170 52.7 37.9 139 Northeast Entrance 7350 .0 .0 * 20.8 15.3 136 Parker Peak 9400 28.7 20.9 137 33.9 22.1 153 Sylvan Lake 8420 14.6 16.3 90 32.6 27.2 120 Thumb Divide 7980 .8 3.6 22 22.6 22.5 100 Two Ocean Plateau 9240 36.2 29.0 125 35.3 32.4 109 White Mill 8700 39.5 23.7 167 35.9 28.6 126 Wolverine 7650 .4 .0 * 23.9 15.3 156 ----- ----- Basin Index (%) 139 129 WIND RIVER Burroughs Creek 8750 2.4 -M * 21.7 -M * Castle Creek 8400 .0 -M * 13.1 -M * Cold Springs 9630 .0 .0 * 13.8 14.2 97 Deer Park 9700 8.4 12.4 68 20.6 25.7 80 Hobbs Park 10100 13.9 14.4 97 19.3 19.0 102 Kirwin 9550 13.2 9.7 136 22.0 15.6 141 Little Warm 9370 7.4 4.9 151 20.7 17.1 121 Owl Creek 8975 -M .0 * 10.4 9.4 111 South Pass 9040 3.2 9.2 35 13.0 22.2 59 St. Lawrence Alt 8620 .0 .0 * 11.5 13.2 87 Togwotee Pass 9580 30.9 23.8 130 39.6 29.3 135 Townsend Creek 8700 .0 .3 0* 13.3 16.8 79 ----- ----- Basin Index (%) 103 101 BIGHORN BASIN Bald Mtn. 9380 19.2 20.3 95 20.5 21.8 94 Bear Trap Meadow 8200 .0 .0 * 12.5 12.4 101 Bone Springs Div 9350 16.1 15.3 105 19.6 20.5 96 Grave Springs 8550 .0 5.2 0 8.0 14.8 54 Kirwin 9550 13.2 9.7 136 22.0 15.6 141 Marquette 8760 1.4 -M * 15.3 -M * Middle Powder 7760 .0 7.7 0 9.5 16.0 59 Owl Creek 8975 -M .0 * 10.4 9.4 111 Powder River Pass 9480 8.0 7.4 108 18.7 17.0 110 Shell Creek 9580 18.0 16.1 112 19.5 18.3 107 Timber Creek 7950 .0 .0 * -M 11.9 * ----- ----- Basin Index (%) 91 97 SHOSHONE RIVER Blackwater 9780 32.3 24.9 130 37.0 25.6 145 Evening Star 9200 35.8 24.9 144 49.4 32.9 150 Marquette 8760 1.4 -M * 15.3 -M * Sylvan Road 7120 .1 .0 * 25.3 20.0 126 Younts Peak 8350 -M 12.9 * -M 19.2 * ----- ----- Basin Index (%) 137* 142 POWDER RIVER Bear Trap Meadow 8200 .0 .0 * 12.5 12.4 101 Cloud Peak Reservoir 9860 12.3 15.8 78 19.7 19.3 102 Grave Springs 8550 .0 5.2 0 8.0 14.8 54 Hansen Sawmill 8360 .0 .0 * 14.1 12.6 112 Middle Powder 7760 .0 7.7 0 9.5 16.0 59 Powder River Pass 9480 8.0 7.4 108 18.7 17.0 110 Soldier Park 8720 .3 -M * 13.9 -M * ----- ----- Basin Index (%) 56 90 TONGUE RIVER Big Goose 7990 1.4 7.5 19 12.8 16.8 76 Bone Springs Div 9350 16.1 15.3 105 19.6 20.5 96 Burgess Junction 7880 5.4 9.8 55 12.4 16.7 74 Dome Lake 8880 7.8 8.5 92 17.9 18.7 96 Little Goose 8870 3.2 -M * 16.7 -M * Sucker Creek 8880 2.0 10.3 19 13.6 19.9 68 Tie Creek 6870 .1 .0 * 13.1 16.9 78 ----- ----- Basin Index (%) 64 82 BELLE FOURCHE Cole Canyon 5910 .0 .0 * 13.6 14.6 93 ----- ----- Basin Index (%) * 93 CHEYENNE RIVER BASIN Blind Park 6890 .0 .0 * 14.6 16.4 89 North Rapid Creek 6130 .0 .0 * 12.8 14.3 90 ----- ----- Basin Index (%) * 89 UPPER N. PLATTE Arapaho Ridge 10960 14.7 20.5 72 25.4 28.4 89 Blackhall Mtn 9820 15.1 -M * 30.7 -M * Columbine 9160 .0 6.4 0 29.6 30.4 97 Divide Peak 8880 .0 8.6 0 20.5 26.2 78 Joe Wright 10120 15.2 22.3 68 35.8 32.5 110 Laprele Creek 8375 .1 .0 * 11.3 16.6 68 Med Bow 10500 37.0 -M * 39.2 -M * North French Creek 10130 20.5 31.3 65 32.1 33.4 96 Never Summer 10280 18.3 21.7 84 20.8 -M * Old Battle 10000 21.7 33.9 64 27.6 41.8 66 Rawah 9020 .2 .9 22* 18.4 18.8 98 Sage Creek Basin 7850 -M .0 * 11.7 17.2 68 Sand Lake 10050 23.6 29.3 81 27.6 31.5 88 South Brush Creek 8440 .0 .5 0* 14.0 19.8 71 Tower 10500 31.9 49.0 65 42.8 47.5 90 Webber Springs 9250 2.8 14.8 19 24.2 31.8 76 Willow Creek Pass 9540 7.8 10.6 74 17.6 17.1 103 Zirkel 9340 -M 14.3 * 35.1 33.3 105 ----- ----- Basin Index (%) 63 88 SWEETWATER Deer Park 9700 8.4 12.4 68 20.6 25.7 80 Larsen Creek 9000 .0 4.5 0 14.2 -M * South Pass 9040 3.2 9.2 35 13.0 22.2 59 ----- ----- Basin Index (%) 44 70 LOWER N. PLATTE Casper Mtn. 7900 .0 7.4 0 10.6 20.1 53 Laprele Creek 8375 .1 .0 * 11.3 16.6 68 Reno Hill 8400 .1 6.4 2 15.9 21.0 76 Windy Peak 7900 .1 .0 * 12.6 14.4 88 ----- ----- Basin Index (%) 2 70 LARAMIE RIVER Brooklyn Lake 10240 12.3 18.7 66 29.3 26.9 109 Cinnabar Park 9574 8.0 14.4 56 27.9 29.4 95 Crow Creek 8330 .0 .0 * 14.5 15.0 97 Deadman Hill 10220 11.9 17.9 66 23.9 22.7 105 Rawah 9020 .2 .9 22* 18.4 18.8 98 Roach 9700 3.7 13.1 28 20.8 24.3 86 ----- ----- Basin Index (%) 56 98 S. PLATTE Black Mountain 8920 -M -M * 16.7 -M * Crow Creek 8330 .0 .0 * 14.5 15.0 97 Deadman Hill 10220 11.9 17.9 66 23.9 22.7 105 ----- ----- Basin Index (%) 66* 102 LITTLE SNAKE RIVER Battle Mountain 7440 .0 .0 * 13.3 18.5 72 Divide Peak 8880 .0 8.6 0 20.5 26.2 78 Elk River 8700 .0 1.2 0* 19.2 24.4 79 Little Snake River 8915 1.2 16.5 7 31.1 35.0 89 Old Battle 10000 21.7 33.9 64 27.6 41.8 66 Sage Creek Basin 7850 -M .0 * 11.7 17.2 68 Sandstone RS 8150 -M .0 * 11.9 22.3 53 Whiskey Park 8950 6.3 23.8 26 29.2 33.7 87 ----- ----- Basin Index (%) 35 75 UPPER GREEN RIVER Big Sandy Opening 9080 .3 6.1 5 16.0 16.6 96 Blind Bull Sum 8650 -M 21.5 * 24.4 23.0 106 East Rim Divide 7930 .0 2.6 0 15.7 14.0 112 Elkhart Park G.S. 9400 4.5 7.5 60 16.3 16.5 99 Gros Ventre Summit 8750 7.3 7.6 96 18.8 15.9 118 Gunsight Pass 9820 13.9 11.7 119 21.4 17.5 122 Kendall R.S. 7740 .1 .0 * 19.6 16.6 118 Loomis Park 8240 2.7 4.8 56 22.4 20.4 110 New Fork Lake 8340 .0 .4 0* 15.1 13.4 113 Pocket Creek 9360 -M -M * 12.0 -M * Snider Basin 8060 .0 2.9 0 17.6 16.6 106 Spring Creek Divide 9000 21.0 22.0 95 29.2 27.8 105 Triple Peak 8500 15.4 11.1 139 37.7 30.0 126 ----- ----- Basin Index (%) 85 111 LOWER GREEN RIVER Blacks Fork Jct 8869 .0 -M * 12.2 -M * Buck Pasture 9632 .0 -M * 18.2 -M * EF Blacks Fork GS 9360 -M -M * 11.0 -M * Hams Fork 7840 .0 .0 * 13.2 14.2 93 Hewinta 9500 .0 .0 * 15.3 17.6 87 Hickerson Park 9122 .4 .0 * 12.4 13.3 93 Hole-in-Rock 9168 .0 .0 * 13.0 12.8 102 Indian Creek 9425 13.8 20.5 67 20.3 26.8 76 Kelley R.S. 8180 .1 5.1 2 18.2 21.6 84 Spirit Lk 10235 1.8 -M * 17.0 -M * Steel Creek Park 10158 10.9 15.8 69 19.3 20.8 93 ----- ----- Basin Index (%) 61* 88 UPPER BEAR RIVER Bear River RS 8777 .0 -M * 13.5 -M * Bug Lake 7987 .0 8.4 0 19.9 23.2 86 Burts Miller Ranch 8000 .1 -M * 7.6 -M * Chalk Creek #1 9171 .0 18.0 0 19.8 30.6 65 Hayden Fork 9130 .0 1.1 0* 19.9 25.6 78 Kelley R.S. 8180 .1 5.1 2 18.2 21.6 84 Lily Lake 9133 .0 .0 * 14.5 21.2 68 Monte Cristo 8932 10.6 17.5 61 26.7 31.4 85 Salt River Summit 7640 .0 .6 0* 16.0 19.7 81 ----- ----- Basin Index (%) 21* 78 ----------------------------------------------------------------------------- -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.