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 1 , 2018 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 13.2 9.3 142 25.5 22.8 112 Black Bear 8170 47.0 37.4 126 46.6 41.7 112 Blind Bull Sum 8650 -M 23.1 * 22.5 21.3 106 Cottonwood Creek 7670 18.0 15.3 118 30.7 27.5 112 East Rim Divide 7930 3.6 8.2 44 14.1 12.9 109 Grand Targhee 9260 53.7 44.8 120 38.7 34.6 112 Granite Creek 6770 11.3 8.3 136 24.5 21.3 115 Grassy Lake 7265 28.3 29.1 97 40.9 39.3 104 Gros Ventre Summit 8750 15.0 11.6 129 17.3 14.6 118 Gunsight Pass 9820 17.3 12.5 138 19.5 16.0 122 Lewis Lake Divide 7850 43.3 30.1 144 -M 38.5 * Phillips Bench 8200 29.1 25.4 115 32.7 30.7 107 Salt River Summit 7640 2.7 7.9 34 14.8 18.4 80 Snake River Station 6920 10.1 7.4 136 27.2 24.7 110 Spring Creek Divide 9000 27.3 24.3 112 27.8 26.2 106 Thumb Divide 7980 15.4 12.4 124 22.2 20.9 106 Togwotee Pass 9580 35.2 24.7 143 38.2 27.2 140 Two Ocean Plateau 9240 43.6 29.7 147 34.6 30.1 115 Willow Creek 8080 31.8 23.0 138 42.0 37.5 112 Younts Peak 8350 -M 15.5 * -M 17.6 * ----- ----- Basin Index (%) 123 111 MADISON-GALLATIN Black Bear 8170 47.0 37.4 126 46.6 41.7 112 Canyon 7870 16.2 10.4 156 21.7 18.0 121 Madison Plateau 7750 29.6 21.3 139 31.8 28.9 110 West Yellowstone 6700 4.7 1.8 261 20.1 16.0 126 Whiskey Creek 6800 15.6 14.6 107 22.7 22.3 102 ----- ----- Basin Index (%) 132 113 YELLOWSTONE Beartooth Lake 9360 40.5 22.8 178 39.1 21.9 179 Burnt Mtn 5880 3.1 .0 * 17.7 15.9 111 Canyon 7870 16.2 10.4 156 21.7 18.0 121 Cole Creek 7850 16.5 16.6 99 15.0 16.4 91 Evening Star 9200 44.1 24.9 177 -M 30.4 * Fisher Creek 9100 56.8 32.7 174 52.0 35.1 148 Northeast Entrance 7350 8.8 3.0 293 20.4 13.8 148 Parker Peak 9400 38.4 21.3 180 33.6 20.0 168 Sylvan Lake 8420 24.9 19.8 126 31.8 25.1 127 Thumb Divide 7980 15.4 12.4 124 22.2 20.9 106 Two Ocean Plateau 9240 43.6 29.7 147 34.6 30.1 115 White Mill 8700 43.5 23.8 183 35.8 26.3 136 Wolverine 7650 18.4 2.5 736 23.8 13.7 174 ----- ----- Basin Index (%) 168 135 WIND RIVER Burroughs Creek 8750 12.9 -M * 20.1 -M * Castle Creek 8400 1.1 -M * 11.7 -M * Cold Springs 9630 4.4 1.3 338 11.1 12.4 90 Deer Park 9700 11.6 16.0 72 18.3 23.4 78 Hobbs Park 10100 17.0 16.0 106 17.0 16.6 102 Kirwin 9550 19.7 10.4 189 20.4 13.8 148 Little Warm 9370 15.0 8.7 172 19.4 15.3 127 Owl Creek 8975 .6 1.0 60 8.4 7.9 106 South Pass 9040 10.0 14.9 67 -M 20.3 * St. Lawrence Alt 8620 .1 2.5 4 9.4 11.5 82 Togwotee Pass 9580 35.2 24.7 143 38.2 27.2 140 Townsend Creek 8700 2.7 7.5 36 11.1 14.9 74 ----- ----- Basin Index (%) 113 107 BIGHORN BASIN Bald Mtn. 9380 22.4 20.5 109 19.1 19.7 97 Bear Trap Meadow 8200 5.7 .9 633 12.2 10.6 115 Bone Springs Div 9350 22.3 16.5 135 18.1 18.2 99 Grave Springs 8550 6.5 9.4 69 -M 12.8 * Kirwin 9550 19.7 10.4 189 20.4 13.8 148 Marquette 8760 7.1 -M * 13.3 -M * Middle Powder 7760 9.0 11.6 78 -M 14.1 * Owl Creek 8975 .6 1.0 60 8.4 7.9 106 Powder River Pass 9480 15.1 9.4 161 17.8 15.1 118 Shell Creek 9580 23.4 15.9 147 18.7 16.3 115 Timber Creek 7950 1.4 3.1 45 -M 9.9 * ----- ----- Basin Index (%) 128 113 SHOSHONE RIVER Blackwater 9780 37.6 25.3 149 35.8 23.4 153 Evening Star 9200 44.1 24.9 177 -M 30.4 * Marquette 8760 7.1 -M * 13.3 -M * Sylvan Road 7120 6.5 5.8 112 25.0 18.6 134 Younts Peak 8350 -M 15.5 * -M 17.6 * ----- ----- Basin Index (%) 158 145* POWDER RIVER Bear Trap Meadow 8200 5.7 .9 633 12.2 10.6 115 Cloud Peak Reservoir 9860 16.8 16.5 102 17.9 16.6 108 Grave Springs 8550 6.5 9.4 69 -M 12.8 * Hansen Sawmill 8360 6.2 2.5 248 12.8 10.8 119 Middle Powder 7760 9.0 11.6 78 -M 14.1 * Powder River Pass 9480 15.1 9.4 161 17.8 15.1 118 Soldier Park 8720 4.4 -M * 12.6 -M * ----- ----- Basin Index (%) 118 114 TONGUE RIVER Big Goose 7990 8.1 9.2 88 11.3 14.0 81 Bone Springs Div 9350 22.3 16.5 135 18.1 18.2 99 Burgess Junction 7880 11.3 12.1 93 10.9 14.8 74 Dome Lake 8880 13.6 11.4 119 15.4 16.4 94 Little Goose 8870 9.2 -M * 15.4 -M * Sucker Creek 8880 10.4 12.2 85 12.1 17.3 70 Tie Creek 6870 .8 2.7 30 11.8 14.3 83 ----- ----- Basin Index (%) 104 84 BELLE FOURCHE Cole Canyon 5910 1.1 .3 367* 12.8 11.8 108 ----- ----- Basin Index (%) 367* 108 CHEYENNE RIVER BASIN Blind Park 6890 1.0 .8 125 13.7 14.3 96 North Rapid Creek 6130 .0 .8 0 11.0 12.2 90 ----- ----- Basin Index (%) 62 93 UPPER N. PLATTE Arapaho Ridge 10960 21.1 22.3 95 23.8 26.2 91 Blackhall Mtn 9820 25.7 -M * 30.0 -M * Columbine 9160 16.8 18.2 92 28.8 28.5 101 Divide Peak 8880 7.2 18.0 40 20.2 24.3 83 Joe Wright 10120 21.1 23.3 91 33.9 29.8 114 Laprele Creek 8375 .1 6.1 2 9.8 15.0 65 Med Bow 10500 43.6 -M * 37.8 -M * North French Creek 10130 28.9 32.9 88 31.2 30.7 102 Never Summer 10280 21.0 21.8 96 18.8 -M * Old Battle 10000 26.4 34.7 76 26.6 39.2 68 Rawah 9020 5.1 6.1 84 17.1 17.2 99 Sage Creek Basin 7850 -M 1.1 * 11.4 16.1 71 Sand Lake 10050 28.6 31.4 91 26.3 29.0 91 South Brush Creek 8440 .4 9.2 4 13.5 17.8 76 Tower 10500 44.1 50.0 88 41.5 44.7 93 Webber Springs 9250 14.1 21.7 65 23.7 29.9 79 Willow Creek Pass 9540 13.3 14.2 94 16.2 15.8 103 Zirkel 9340 17.0 21.0 81 34.5 31.0 111 ----- ----- Basin Index (%) 80 91 SWEETWATER Deer Park 9700 11.6 16.0 72 18.3 23.4 78 Larsen Creek 9000 3.9 9.2 42 13.1 -M * South Pass 9040 10.0 14.9 67 -M 20.3 * ----- ----- Basin Index (%) 64 78* LOWER N. PLATTE Casper Mtn. 7900 4.8 13.3 36 8.2 17.9 46 Laprele Creek 8375 .1 6.1 2 9.8 15.0 65 Reno Hill 8400 8.5 12.6 67 13.7 18.9 72 Windy Peak 7900 1.1 4.0 28 10.1 13.0 78 ----- ----- Basin Index (%) 40 65 LARAMIE RIVER Brooklyn Lake 10240 23.0 23.3 99 28.4 24.7 115 Cinnabar Park 9574 18.2 19.4 94 27.2 26.9 101 Crow Creek 8330 .0 .0 * 12.4 13.4 93 Deadman Hill 10220 19.8 19.0 104 22.2 20.6 108 Rawah 9020 5.1 6.1 84 17.1 17.2 99 Roach 9700 11.1 17.2 65 19.2 22.2 86 ----- ----- Basin Index (%) 91 101 S. PLATTE Black Mountain 8920 5.7 -M * 14.8 -M * Crow Creek 8330 .0 .0 * 12.4 13.4 93 Deadman Hill 10220 19.8 19.0 104 22.2 20.6 108 ----- ----- Basin Index (%) 104* 102 LITTLE SNAKE RIVER Battle Mountain 7440 .0 .0 * 12.1 17.1 71 Divide Peak 8880 7.2 18.0 40 20.2 24.3 83 Elk River 8700 5.0 13.2 38 18.6 22.7 82 Little Snake River 8915 15.1 22.3 68 30.5 32.7 93 Old Battle 10000 26.4 34.7 76 26.6 39.2 68 Sage Creek Basin 7850 -M 1.1 * 11.4 16.1 71 Sandstone RS 8150 .0 5.9 0 11.1 20.8 53 Whiskey Park 8950 20.4 26.5 77 28.7 31.5 91 ----- ----- Basin Index (%) 61 78 UPPER GREEN RIVER Big Sandy Opening 9080 10.4 10.6 98 14.9 15.1 99 Blind Bull Sum 8650 -M 23.1 * 22.5 21.3 106 East Rim Divide 7930 3.6 8.2 44 14.1 12.9 109 Elkhart Park G.S. 9400 10.4 11.3 92 13.4 15.0 89 Gros Ventre Summit 8750 15.0 11.6 129 17.3 14.6 118 Gunsight Pass 9820 17.3 12.5 138 19.5 16.0 122 Kendall R.S. 7740 6.6 4.3 153 17.3 15.5 112 Loomis Park 8240 12.8 11.0 116 20.9 18.9 111 New Fork Lake 8340 4.6 6.5 71 12.9 12.1 107 Pocket Creek 9360 8.8 -M * 10.5 -M * Snider Basin 8060 1.6 9.4 17 16.0 15.6 103 Spring Creek Divide 9000 27.3 24.3 112 27.8 26.2 106 Triple Peak 8500 28.9 17.5 165 35.6 27.9 128 ----- ----- Basin Index (%) 109 110 LOWER GREEN RIVER Blacks Fork Jct 8869 .0 -M * 10.6 -M * Buck Pasture 9632 7.0 -M * 15.8 -M * EF Blacks Fork GS 9360 2.5 -M * 11.0 -M * Hams Fork 7840 .0 2.9 0 11.8 13.1 90 Hewinta 9500 .0 4.8 0 13.1 16.1 81 Hickerson Park 9122 .0 4.2 0 9.2 12.0 77 Hole-in-Rock 9168 .0 2.5 0 10.0 11.4 88 Indian Creek 9425 20.2 23.0 88 18.5 25.0 74 Kelley R.S. 8180 8.2 11.5 71 16.9 20.2 84 Spirit Lk 10235 6.6 -M * 14.0 -M * Steel Creek Park 10158 13.7 17.1 80 16.6 19.1 87 ----- ----- Basin Index (%) 64 82 UPPER BEAR RIVER Bear River RS 8777 .0 -M * 11.8 -M * Bug Lake 7987 8.9 15.1 59 18.6 21.7 86 Burts Miller Ranch 8000 .0 -M * 6.7 -M * Chalk Creek #1 9171 8.9 24.2 37 18.4 28.4 65 Hayden Fork 9130 .0 9.3 0 18.2 23.8 76 Kelley R.S. 8180 8.2 11.5 71 16.9 20.2 84 Lily Lake 9133 2.5 9.9 25 12.7 19.5 65 Monte Cristo 8932 18.5 26.5 70 25.3 29.2 87 Salt River Summit 7640 2.7 7.9 34 14.8 18.4 80 ----- ----- Basin Index (%) 48 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.