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: APRIL 26 , 2018 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 15.2 10.6 143 24.9 22.2 112 Black Bear 8170 46.6 37.0 126 45.4 40.9 111 Blind Bull Sum 8650 37.4 24.2 155 22.1 20.8 106 Cottonwood Creek 7670 20.8 17.0 122 30.1 26.6 113 East Rim Divide 7930 6.9 8.9 78 13.5 12.5 108 Grand Targhee 9260 54.6 43.3 126 37.8 33.5 113 Granite Creek 6770 13.7 9.3 147 24.1 20.7 116 Grassy Lake 7265 31.5 30.1 105 40.0 38.4 104 Gros Ventre Summit 8750 15.9 12.3 129 17.1 14.1 121 Gunsight Pass 9820 18.4 13.4 137 18.9 15.5 122 Lewis Lake Divide 7850 44.4 30.7 145 -M 37.7 * Phillips Bench 8200 32.2 25.5 126 32.3 29.9 108 Salt River Summit 7640 6.0 8.4 71 14.5 17.9 81 Snake River Station 6920 13.4 9.8 137 26.4 24.2 109 Spring Creek Divide 9000 29.0 23.9 121 27.3 25.5 107 Thumb Divide 7980 18.0 14.1 128 21.5 20.3 106 Togwotee Pass 9580 35.8 24.5 146 37.4 26.5 141 Two Ocean Plateau 9240 43.6 29.2 149 34.0 29.3 116 Willow Creek 8080 36.2 25.3 143 40.9 36.5 112 Younts Peak 8350 -M 15.1 * -M 17.1 * ----- ----- Basin Index (%) 131 112 MADISON-GALLATIN Black Bear 8170 46.6 37.0 126 45.4 40.9 111 Canyon 7870 17.9 11.6 154 21.6 17.5 123 Madison Plateau 7750 30.1 22.4 134 30.5 28.2 108 West Yellowstone 6700 8.0 4.7 170 19.4 15.5 125 Whiskey Creek 6800 16.1 15.4 105 22.4 21.8 103 ----- ----- Basin Index (%) 130 112 YELLOWSTONE Beartooth Lake 9360 42.1 23.5 179 39.0 21.3 183 Burnt Mtn 5880 5.7 .0 * 17.3 14.9 116 Canyon 7870 17.9 11.6 154 21.6 17.5 123 Cole Creek 7850 17.0 16.3 104 14.4 15.5 93 Evening Star 9200 44.9 24.6 183 -M 29.6 * Fisher Creek 9100 57.0 33.2 172 51.7 34.3 151 Northeast Entrance 7350 12.3 4.9 251 20.3 13.4 151 Parker Peak 9400 39.3 21.8 180 33.4 19.4 172 Sylvan Lake 8420 26.8 20.3 132 31.4 24.3 129 Thumb Divide 7980 18.0 14.1 128 21.5 20.3 106 Two Ocean Plateau 9240 43.6 29.2 149 34.0 29.3 116 White Mill 8700 45.3 23.8 190 35.7 25.6 139 Wolverine 7650 21.2 5.2 408 23.5 13.3 177 ----- ----- Basin Index (%) 171 138 WIND RIVER Burroughs Creek 8750 15.0 -M * 19.9 -M * Castle Creek 8400 4.3 -M * 11.0 -M * Cold Springs 9630 6.8 2.7 252 11.0 11.7 94 Deer Park 9700 11.9 16.3 73 16.7 22.8 73 Hobbs Park 10100 18.2 15.7 116 16.7 15.9 105 Kirwin 9550 19.3 10.2 189 20.2 13.1 154 Little Warm 9370 16.5 9.4 176 19.2 14.6 132 Owl Creek 8975 1.3 2.3 57 7.5 7.4 101 South Pass 9040 10.9 15.2 72 -M 19.6 * St. Lawrence Alt 8620 .0 4.6 0 9.1 10.9 83 Togwotee Pass 9580 35.8 24.5 146 37.4 26.5 141 Townsend Creek 8700 5.1 8.7 59 10.3 14.3 72 ----- ----- Basin Index (%) 115 108 BIGHORN BASIN Bald Mtn. 9380 24.4 20.5 119 18.9 18.9 100 Bear Trap Meadow 8200 8.5 1.7 500 11.9 10.0 119 Bone Springs Div 9350 22.5 16.4 137 17.6 17.4 101 Grave Springs 8550 7.9 9.2 86 -M 12.3 * Kirwin 9550 19.3 10.2 189 20.2 13.1 154 Marquette 8760 7.1 -M * 11.7 -M * Middle Powder 7760 10.7 12.2 88 -M 13.5 * Owl Creek 8975 1.3 2.3 57 7.5 7.4 101 Powder River Pass 9480 16.6 10.1 164 17.5 14.3 122 Shell Creek 9580 23.4 15.9 147 18.3 15.5 118 Timber Creek 7950 .1 3.6 3 -M 9.2 * ----- ----- Basin Index (%) 132 116 SHOSHONE RIVER Blackwater 9780 37.7 24.6 153 35.6 22.7 157 Evening Star 9200 44.9 24.6 183 -M 29.6 * Marquette 8760 7.1 -M * 11.7 -M * Sylvan Road 7120 11.1 7.9 141 24.9 18.0 138 Younts Peak 8350 -M 15.1 * -M 17.1 * ----- ----- Basin Index (%) 164 149* POWDER RIVER Bear Trap Meadow 8200 8.5 1.7 500 11.9 10.0 119 Cloud Peak Reservoir 9860 17.2 16.4 105 16.8 15.8 106 Grave Springs 8550 7.9 9.2 86 -M 12.3 * Hansen Sawmill 8360 8.4 4.1 205 12.1 10.3 117 Middle Powder 7760 10.7 12.2 88 -M 13.5 * Powder River Pass 9480 16.6 10.1 164 17.5 14.3 122 Soldier Park 8720 6.7 -M * 11.6 -M * ----- ----- Basin Index (%) 129 116 TONGUE RIVER Big Goose 7990 9.3 9.1 102 11.1 13.5 82 Bone Springs Div 9350 22.5 16.4 137 17.6 17.4 101 Burgess Junction 7880 11.7 12.4 94 10.8 14.1 77 Dome Lake 8880 16.0 11.8 136 14.9 15.6 96 Little Goose 8870 11.0 -M * 14.9 -M * Sucker Creek 8880 12.1 12.6 96 11.9 16.6 72 Tie Creek 6870 3.9 3.2 122 11.4 13.6 84 ----- ----- Basin Index (%) 115 86 BELLE FOURCHE Cole Canyon 5910 5.3 .6 883 12.5 11.0 114 ----- ----- Basin Index (%) 883 114 CHEYENNE RIVER BASIN Blind Park 6890 5.0 3.2 156 13.6 13.7 99 North Rapid Creek 6130 3.7 3.1 119 10.9 11.7 93 ----- ----- Basin Index (%) 138 96 UPPER N. PLATTE Arapaho Ridge 10960 24.1 21.9 110 23.9 25.6 93 Blackhall Mtn 9820 28.5 -M * 30.0 -M * Columbine 9160 22.7 20.3 112 28.7 27.8 103 Divide Peak 8880 11.9 18.0 66 20.2 23.7 85 Joe Wright 10120 23.3 23.4 100 33.9 29.0 117 Laprele Creek 8375 3.5 7.2 49 9.7 14.5 67 Med Bow 10500 45.1 -M * 37.8 -M * North French Creek 10130 31.0 32.8 95 31.1 29.8 104 Never Summer 10280 22.4 21.3 105 18.8 -M * Old Battle 10000 27.8 34.3 81 26.7 38.2 70 Rawah 9020 8.7 8.0 109 17.2 16.7 103 Sage Creek Basin 7850 -M 2.2 * 11.5 15.7 73 Sand Lake 10050 30.0 31.1 96 26.2 28.1 93 South Brush Creek 8440 5.2 10.0 52 13.6 17.2 79 Tower 10500 45.0 49.5 91 -M 43.6 * Webber Springs 9250 16.5 21.9 75 23.7 29.2 81 Willow Creek Pass 9540 14.7 13.8 107 16.3 15.2 107 Zirkel 9340 22.8 22.1 103 34.5 30.4 113 ----- ----- Basin Index (%) 92 93 SWEETWATER Deer Park 9700 11.9 16.3 73 16.7 22.8 73 Larsen Creek 9000 7.1 9.7 73 12.2 -M * South Pass 9040 10.9 15.2 72 -M 19.6 * ----- ----- Basin Index (%) 73 73* LOWER N. PLATTE Casper Mtn. 7900 7.6 14.2 54 8.1 17.3 47 Laprele Creek 8375 3.5 7.2 49 9.7 14.5 67 Reno Hill 8400 10.5 13.7 77 13.6 18.1 75 Windy Peak 7900 4.2 5.8 72 10.1 12.5 81 ----- ----- Basin Index (%) 63 67 LARAMIE RIVER Brooklyn Lake 10240 26.5 22.9 116 28.4 23.9 119 Cinnabar Park 9574 21.4 20.0 107 27.2 26.3 103 Crow Creek 8330 .1 .0 * 12.5 12.9 97 Deadman Hill 10220 22.5 18.3 123 22.0 20.0 110 Rawah 9020 8.7 8.0 109 17.2 16.7 103 Roach 9700 13.7 16.9 81 19.2 21.6 89 ----- ----- Basin Index (%) 108 104 S. PLATTE Black Mountain 8920 9.1 -M * 14.9 -M * Crow Creek 8330 .1 .0 * 12.5 12.9 97 Deadman Hill 10220 22.5 18.3 123 22.0 20.0 110 ----- ----- Basin Index (%) 123* 105 LITTLE SNAKE RIVER Battle Mountain 7440 .0 1.6 0 12.7 16.7 76 Divide Peak 8880 11.9 18.0 66 20.2 23.7 85 Elk River 8700 10.3 14.4 72 18.7 22.1 85 Little Snake River 8915 18.6 23.2 80 30.6 31.8 96 Old Battle 10000 27.8 34.3 81 26.7 38.2 70 Sage Creek Basin 7850 -M 2.2 * 11.5 15.7 73 Sandstone RS 8150 2.7 8.2 33 11.0 20.2 54 Whiskey Park 8950 23.1 25.6 90 28.6 30.7 93 ----- ----- Basin Index (%) 75 80 UPPER GREEN RIVER Big Sandy Opening 9080 12.0 12.0 100 14.1 14.7 96 Blind Bull Sum 8650 37.4 24.2 155 22.1 20.8 106 East Rim Divide 7930 6.9 8.9 78 13.5 12.5 108 Elkhart Park G.S. 9400 12.4 11.8 105 13.2 14.5 91 Gros Ventre Summit 8750 15.9 12.3 129 17.1 14.1 121 Gunsight Pass 9820 18.4 13.4 137 18.9 15.5 122 Kendall R.S. 7740 9.2 6.3 146 16.9 15.0 113 Loomis Park 8240 14.8 11.6 128 20.3 18.4 110 New Fork Lake 8340 7.0 7.2 97 12.6 11.6 109 Pocket Creek 9360 9.4 -M * 10.1 -M * Snider Basin 8060 5.3 10.0 53 16.0 15.2 105 Spring Creek Divide 9000 29.0 23.9 121 27.3 25.5 107 Triple Peak 8500 32.9 18.9 174 35.2 27.1 130 ----- ----- Basin Index (%) 125 111 LOWER GREEN RIVER Blacks Fork Jct 8869 1.8 -M * 10.5 -M * Buck Pasture 9632 10.1 -M * 15.4 -M * EF Blacks Fork GS 9360 6.8 -M * -M -M * Hams Fork 7840 2.9 4.6 63 11.6 12.6 92 Hewinta 9500 3.6 6.5 55 12.8 15.6 82 Hickerson Park 9122 .8 5.1 16 9.2 11.6 79 Hole-in-Rock 9168 2.1 4.6 46 9.7 11.1 87 Indian Creek 9425 22.8 23.8 96 18.2 24.3 75 Kelley R.S. 8180 10.7 11.8 91 16.3 19.6 83 Spirit Lk 10235 9.2 -M * 13.6 -M * Steel Creek Park 10158 15.0 16.6 90 16.3 18.5 88 ----- ----- Basin Index (%) 79 83 UPPER BEAR RIVER Bear River RS 8777 .0 -M * 11.6 -M * Bug Lake 7987 11.6 16.2 72 18.0 21.1 85 Burts Miller Ranch 8000 .2 -M * 6.7 -M * Chalk Creek #1 9171 12.3 24.7 50 18.0 27.7 65 Hayden Fork 9130 2.4 10.4 23 18.0 23.1 78 Kelley R.S. 8180 10.7 11.8 91 16.3 19.6 83 Lily Lake 9133 6.3 9.8 64 12.5 19.0 66 Monte Cristo 8932 21.6 27.3 79 24.5 28.4 86 Salt River Summit 7640 6.0 8.4 71 14.5 17.9 81 ----- ----- Basin Index (%) 65 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.