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 5 , 2018 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 11.0 7.2 153 25.7 23.2 111 Black Bear 8170 48.3 37.2 130 46.8 42.3 111 Blind Bull Sum 8650 39.2 22.7 173 22.5 21.7 104 Cottonwood Creek 7670 16.1 14.1 114 30.8 28.0 110 East Rim Divide 7930 .3 7.4 4 14.2 13.1 108 Grand Targhee 9260 55.4 46.0 120 38.9 35.3 110 Granite Creek 6770 -M 7.4 * -M 21.6 * Grassy Lake 7265 27.1 27.6 98 41.1 39.8 103 Gros Ventre Summit 8750 13.2 10.8 122 17.5 14.9 117 Gunsight Pass 9820 16.6 11.8 141 19.5 16.3 120 Lewis Lake Divide 7850 42.4 29.5 144 -M 39.1 * Phillips Bench 8200 28.7 24.2 119 33.0 31.1 106 Salt River Summit 7640 .8 7.1 11 14.9 18.6 80 Snake River Station 6920 7.4 5.1 145 27.4 25.1 109 Spring Creek Divide 9000 27.1 24.2 112 27.9 26.6 105 Thumb Divide 7980 13.8 10.3 134 22.3 21.3 105 Togwotee Pass 9580 35.1 24.8 142 38.5 27.8 138 Two Ocean Plateau 9240 42.1 29.9 141 34.8 30.6 114 Willow Creek 8080 31.1 21.8 143 42.0 38.3 110 Younts Peak 8350 -M 15.7 * -M 18.0 * ----- ----- Basin Index (%) 126 110 MADISON-GALLATIN Black Bear 8170 48.3 37.2 130 46.8 42.3 111 Canyon 7870 15.0 8.8 170 22.0 18.3 120 Madison Plateau 7750 -M 20.8 * -M 29.4 * West Yellowstone 6700 .8 .0 * 20.2 16.2 125 Whiskey Creek 6800 15.0 12.9 116 23.3 22.6 103 ----- ----- Basin Index (%) 134 113 YELLOWSTONE Beartooth Lake 9360 -M 22.7 * -M 22.3 * Burnt Mtn 5880 .3 .0 * 18.4 16.2 114 Canyon 7870 15.0 8.8 170 22.0 18.3 120 Cole Creek 7850 16.4 16.8 98 15.4 16.8 92 Evening Star 9200 -M 24.9 * -M 30.9 * Fisher Creek 9100 56.8 32.9 173 52.2 35.7 146 Northeast Entrance 7350 6.4 1.2 533 20.6 14.0 147 Parker Peak 9400 -M 21.3 * -M 20.4 * Sylvan Lake 8420 23.8 18.7 127 32.1 25.5 126 Thumb Divide 7980 13.8 10.3 134 22.3 21.3 105 Two Ocean Plateau 9240 42.1 29.9 141 34.8 30.6 114 White Mill 8700 -M 24.0 * -M 26.7 * Wolverine 7650 16.0 .8 2000* 24.0 14.0 171 ----- ----- Basin Index (%) 160 126 WIND RIVER Burroughs Creek 8750 11.3 -M * 20.7 -M * Castle Creek 8400 .1 -M * 11.8 -M * Cold Springs 9630 -M 1.5 * -M 12.8 * Deer Park 9700 11.5 15.1 76 18.8 23.8 79 Hobbs Park 10100 -M 15.9 * -M 17.1 * Kirwin 9550 18.9 10.7 177 20.8 14.2 146 Little Warm 9370 13.8 7.8 177 19.6 15.7 125 Owl Creek 8975 .0 .6 0 8.7 8.2 106 South Pass 9040 9.5 13.8 69 11.2 20.8 54 St. Lawrence Alt 8620 .0 1.8 0 9.6 11.8 81 Togwotee Pass 9580 35.1 24.8 142 38.5 27.8 138 Townsend Creek 8700 2.3 6.2 37 11.5 15.2 76 ----- ----- Basin Index (%) 113 101 BIGHORN BASIN Bald Mtn. 9380 -M 20.4 * -M 20.1 * Bear Trap Meadow 8200 4.3 .3 1433* 12.3 11.0 112 Bone Springs Div 9350 21.6 16.4 132 18.5 18.6 99 Grave Springs 8550 6.4 9.1 70 6.7 13.1 51 Kirwin 9550 18.9 10.7 177 20.8 14.2 146 Marquette 8760 7.0 -M * 13.4 -M * Middle Powder 7760 7.8 11.3 69 7.9 14.5 54 Owl Creek 8975 .0 .6 0 8.7 8.2 106 Powder River Pass 9480 -M 9.1 * -M 15.4 * Shell Creek 9580 -M 16.2 * -M 16.7 * Timber Creek 7950 .8 2.3 35 -M 10.3 * ----- ----- Basin Index (%) 118 94 SHOSHONE RIVER Blackwater 9780 37.9 25.8 147 36.4 23.9 152 Evening Star 9200 -M 24.9 * -M 30.9 * Marquette 8760 7.0 -M * 13.4 -M * Sylvan Road 7120 -M 3.7 * -M 18.9 * Younts Peak 8350 -M 15.7 * -M 18.0 * ----- ----- Basin Index (%) 147* 152* POWDER RIVER Bear Trap Meadow 8200 4.3 .3 1433* 12.3 11.0 112 Cloud Peak Reservoir 9860 -M 16.4 * -M 17.1 * Grave Springs 8550 6.4 9.1 70 6.7 13.1 51 Hansen Sawmill 8360 6.0 1.7 353 13.3 11.1 120 Middle Powder 7760 7.8 11.3 69 7.9 14.5 54 Powder River Pass 9480 -M 9.1 * -M 15.4 * Soldier Park 8720 -M -M * -M -M * ----- ----- Basin Index (%) 109* 81 TONGUE RIVER Big Goose 7990 8.0 9.6 83 12.0 14.5 83 Bone Springs Div 9350 21.6 16.4 132 18.5 18.6 99 Burgess Junction 7880 -M 11.7 * -M 15.1 * Dome Lake 8880 14.0 11.3 124 16.0 16.8 95 Little Goose 8870 9.3 -M * 15.9 -M * Sucker Creek 8880 10.1 12.0 84 12.7 17.8 71 Tie Creek 6870 .3 2.4 12 12.3 14.8 83 ----- ----- Basin Index (%) 104 87 BELLE FOURCHE Cole Canyon 5910 .0 .0 * 13.0 12.4 105 ----- ----- Basin Index (%) * 105 CHEYENNE RIVER BASIN Blind Park 6890 .0 .0 * 13.7 14.7 93 North Rapid Creek 6130 .0 .0 * 11.0 12.6 87 ----- ----- Basin Index (%) * 90 UPPER N. PLATTE Arapaho Ridge 10960 22.1 22.2 100 25.4 26.8 95 Blackhall Mtn 9820 -M -M * -M -M * Columbine 9160 15.6 16.5 95 29.5 29.1 101 Divide Peak 8880 -M 17.1 * -M 24.8 * Joe Wright 10120 22.5 22.8 99 35.9 30.6 117 Laprele Creek 8375 .1 5.2 2 10.2 15.4 66 Med Bow 10500 44.3 -M * 38.9 -M * North French Creek 10130 -M 32.7 * -M 31.3 * Never Summer 10280 22.7 21.9 104 20.7 -M * Old Battle 10000 27.2 35.0 78 27.5 39.8 69 Rawah 9020 5.3 4.4 120 18.4 17.7 104 Sage Creek Basin 7850 -M .6 * 11.6 16.5 70 Sand Lake 10050 29.3 31.6 93 27.1 29.6 92 South Brush Creek 8440 .0 7.5 0 13.8 18.3 75 Tower 10500 45.4 51.0 89 42.7 45.5 94 Webber Springs 9250 14.0 20.8 67 24.4 30.4 80 Willow Creek Pass 9540 14.4 14.5 99 17.7 16.1 110 Zirkel 9340 15.0 20.6 73 35.0 31.5 111 ----- ----- Basin Index (%) 85 92 SWEETWATER Deer Park 9700 11.5 15.1 76 18.8 23.8 79 Larsen Creek 9000 -M 8.0 * -M -M * South Pass 9040 9.5 13.8 69 11.2 20.8 54 ----- ----- Basin Index (%) 73 67 LOWER N. PLATTE Casper Mtn. 7900 2.5 12.2 20 8.6 18.5 46 Laprele Creek 8375 .1 5.2 2 10.2 15.4 66 Reno Hill 8400 7.3 12.0 61 14.2 19.4 73 Windy Peak 7900 .2 2.8 7 10.8 13.3 81 ----- ----- Basin Index (%) 31 66 LARAMIE RIVER Brooklyn Lake 10240 23.1 22.8 101 29.2 25.2 116 Cinnabar Park 9574 17.6 18.5 95 27.8 27.5 101 Crow Creek 8330 .0 .0 * 13.7 13.8 99 Deadman Hill 10220 21.1 19.1 110 23.7 21.1 112 Rawah 9020 5.3 4.4 120 18.4 17.7 104 Roach 9700 -M 17.0 * -M 22.8 * ----- ----- Basin Index (%) 104 107 S. PLATTE Black Mountain 8920 6.7 -M * 16.4 -M * Crow Creek 8330 .0 .0 * 13.7 13.8 99 Deadman Hill 10220 21.1 19.1 110 23.7 21.1 112 ----- ----- Basin Index (%) 110* 107 LITTLE SNAKE RIVER Battle Mountain 7440 .0 .0 * 13.1 17.4 75 Divide Peak 8880 -M 17.1 * -M 24.8 * Elk River 8700 -M 11.3 * -M 23.2 * Little Snake River 8915 14.2 21.4 66 31.2 33.3 94 Old Battle 10000 27.2 35.0 78 27.5 39.8 69 Sage Creek Basin 7850 -M .6 * 11.6 16.5 70 Sandstone RS 8150 -M 4.1 * -M 21.1 * Whiskey Park 8950 19.0 27.0 70 29.2 32.1 91 ----- ----- Basin Index (%) 72* 81 UPPER GREEN RIVER Big Sandy Opening 9080 9.4 9.0 104 15.0 15.5 97 Blind Bull Sum 8650 39.2 22.7 173 22.5 21.7 104 East Rim Divide 7930 .3 7.4 4 14.2 13.1 108 Elkhart Park G.S. 9400 9.4 10.3 91 13.6 15.3 89 Gros Ventre Summit 8750 13.2 10.8 122 17.5 14.9 117 Gunsight Pass 9820 16.6 11.8 141 19.5 16.3 120 Kendall R.S. 7740 4.0 2.0 200 17.3 15.7 110 Loomis Park 8240 11.3 9.5 119 20.9 19.2 109 New Fork Lake 8340 2.5 5.0 50 13.1 12.4 106 Pocket Creek 9360 8.3 -M * 10.7 -M * Snider Basin 8060 .0 8.2 0 16.3 15.8 103 Spring Creek Divide 9000 27.1 24.2 112 27.9 26.6 105 Triple Peak 8500 26.8 15.9 169 35.6 28.3 126 ----- ----- Basin Index (%) 117 109 LOWER GREEN RIVER Blacks Fork Jct 8869 .2 -M * 11.3 -M * Buck Pasture 9632 7.8 -M * 16.8 -M * EF Blacks Fork GS 9360 3.3 -M * 9.0 -M * Hams Fork 7840 .0 1.1 0 11.9 13.3 89 Hewinta 9500 .0 4.0 0 14.1 16.6 85 Hickerson Park 9122 .5 2.7 19 10.4 12.3 85 Hole-in-Rock 9168 .5 1.5 33 11.2 11.9 94 Indian Creek 9425 -M 21.8 * -M 25.4 * Kelley R.S. 8180 7.1 10.0 71 17.0 20.5 83 Spirit Lk 10235 7.5 -M * 15.1 -M * Steel Creek Park 10158 14.8 17.5 85 17.9 19.6 91 ----- ----- Basin Index (%) 62 88 UPPER BEAR RIVER Bear River RS 8777 .0 -M * 12.0 -M * Bug Lake 7987 7.4 13.4 55 18.7 22.1 85 Burts Miller Ranch 8000 .2 -M * 6.9 -M * Chalk Creek #1 9171 7.6 23.2 33 18.5 29.1 64 Hayden Fork 9130 .2 8.1 2 18.7 24.3 77 Kelley R.S. 8180 7.1 10.0 71 17.0 20.5 83 Lily Lake 9133 2.2 9.2 24 13.2 20.0 66 Monte Cristo 8932 17.9 24.6 73 25.4 29.9 85 Salt River Summit 7640 .8 7.1 11 14.9 18.6 80 ----- ----- Basin Index (%) 45 77 ----------------------------------------------------------------------------- -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.