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 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 18.9 14.4 131 23.5 21.1 111 Black Bear 8170 42.5 36.7 116 43.2 38.5 112 Blind Bull Sum 8650 36.6 23.6 155 21.7 19.6 111 Cottonwood Creek 7670 23.5 20.5 115 27.9 24.9 112 East Rim Divide 7930 12.6 10.1 125 13.3 11.8 113 Grand Targhee 9260 50.4 40.0 126 30.7 31.3 98 Granite Creek 6770 18.4 13.3 138 23.5 19.7 119 Grassy Lake 7265 33.8 31.4 108 37.8 36.2 104 Gros Ventre Summit 8750 17.5 12.8 137 16.6 13.1 127 Gunsight Pass 9820 19.0 13.7 139 18.0 14.1 128 Lewis Lake Divide 7850 43.8 30.2 145 42.2 35.7 118 Phillips Bench 8200 31.7 25.9 122 30.6 28.4 108 Salt River Summit 7640 10.4 12.1 86 13.9 16.8 83 Snake River Station 6920 18.3 13.9 132 25.3 22.7 111 Spring Creek Divide 9000 28.2 22.9 123 26.3 24.0 110 Thumb Divide 7980 21.0 14.6 144 20.6 18.8 110 Togwotee Pass 9580 35.2 22.7 155 32.9 24.6 134 Two Ocean Plateau 9240 40.7 26.7 152 30.7 27.5 112 Willow Creek 8080 37.4 27.5 136 38.1 34.0 112 Younts Peak 8350 -M 14.5 * -M 16.0 * ----- ----- Basin Index (%) 131 112 MADISON-GALLATIN Black Bear 8170 42.5 36.7 116 43.2 38.5 112 Canyon 7870 17.9 12.3 146 20.6 16.4 126 Madison Plateau 7750 28.0 22.2 126 28.5 26.5 108 West Yellowstone 6700 12.0 8.6 140 17.8 14.2 125 Whiskey Creek 6800 16.4 14.6 112 19.8 20.3 98 ----- ----- Basin Index (%) 124 112 YELLOWSTONE Beartooth Lake 9360 -M 21.8 * 38.1 20.0 190 Burnt Mtn 5880 7.7 2.4 321 15.5 13.3 117 Canyon 7870 17.9 12.3 146 20.6 16.4 126 Cole Creek 7850 15.8 15.3 103 -M 13.5 * Evening Star 9200 44.9 24.2 186 42.3 27.7 153 Fisher Creek 9100 55.9 31.6 177 49.7 32.0 155 Northeast Entrance 7350 15.8 8.5 186 19.5 12.4 157 Parker Peak 9400 36.6 20.1 182 30.2 17.9 169 Sylvan Lake 8420 27.8 19.8 140 29.6 22.6 131 Thumb Divide 7980 21.0 14.6 144 20.6 18.8 110 Two Ocean Plateau 9240 40.7 26.7 152 30.7 27.5 112 White Mill 8700 44.6 23.1 193 34.4 24.0 143 Wolverine 7650 24.0 9.2 261 22.8 12.3 185 ----- ----- Basin Index (%) 170 145 WIND RIVER Burroughs Creek 8750 17.7 -M * 19.1 -M * Castle Creek 8400 8.7 -M * 10.5 -M * Cold Springs 9630 10.1 6.1 166 10.5 10.3 102 Deer Park 9700 13.0 16.2 80 16.3 20.5 80 Hobbs Park 10100 18.6 14.8 126 15.9 14.0 114 Kirwin 9550 21.1 9.8 215 19.0 11.8 161 Little Warm 9370 17.8 10.3 173 18.4 13.1 140 Owl Creek 8975 4.3 5.6 77 6.4 6.3 102 South Pass 9040 12.3 15.8 78 -M 17.8 * St. Lawrence Alt 8620 -M 6.8 * 8.7 9.3 94 Togwotee Pass 9580 35.2 22.7 155 32.9 24.6 134 Townsend Creek 8700 7.4 10.0 74 9.7 12.6 77 ----- ----- Basin Index (%) 126 112 BIGHORN BASIN Bald Mtn. 9380 23.0 19.3 119 17.1 17.4 98 Bear Trap Meadow 8200 -M 4.6 * 11.7 8.8 133 Bone Springs Div 9350 21.2 17.0 125 16.4 15.9 103 Grave Springs 8550 8.3 9.6 86 -M 11.0 * Kirwin 9550 21.1 9.8 215 19.0 11.8 161 Marquette 8760 6.9 -M * 10.5 -M * Middle Powder 7760 10.4 12.4 84 -M 12.1 * Owl Creek 8975 4.3 5.6 77 6.4 6.3 102 Powder River Pass 9480 17.0 10.3 165 16.7 13.0 128 Shell Creek 9580 22.7 15.6 146 17.2 14.1 122 Timber Creek 7950 3.1 5.1 61 -M 7.6 * ----- ----- Basin Index (%) 125 120 SHOSHONE RIVER Blackwater 9780 37.1 23.3 159 -M 20.9 * Evening Star 9200 44.9 24.2 186 42.3 27.7 153 Marquette 8760 6.9 -M * 10.5 -M * Sylvan Road 7120 15.6 10.4 150 23.7 16.9 140 Younts Peak 8350 -M 14.5 * -M 16.0 * ----- ----- Basin Index (%) 169 148* POWDER RIVER Bear Trap Meadow 8200 -M 4.6 * 11.7 8.8 133 Cloud Peak Reservoir 9860 17.2 15.3 112 15.7 13.8 114 Grave Springs 8550 8.3 9.6 86 -M 11.0 * Hansen Sawmill 8360 9.6 6.1 157 11.6 8.9 130 Middle Powder 7760 10.4 12.4 84 -M 12.1 * Powder River Pass 9480 17.0 10.3 165 16.7 13.0 128 Soldier Park 8720 8.7 -M * 11.1 -M * ----- ----- Basin Index (%) 116 125 TONGUE RIVER Big Goose 7990 9.3 9.9 94 10.0 12.0 83 Bone Springs Div 9350 21.2 17.0 125 16.4 15.9 103 Burgess Junction 7880 11.3 12.2 93 9.7 12.8 76 Dome Lake 8880 16.6 11.9 139 13.6 14.1 96 Little Goose 8870 11.2 -M * 13.5 -M * Sucker Creek 8880 12.5 12.5 100 10.4 14.9 70 Tie Creek 6870 5.9 5.2 113 10.5 12.1 87 ----- ----- Basin Index (%) 112 86 BELLE FOURCHE Cole Canyon 5910 7.6 4.1 185 11.1 9.8 113 ----- ----- Basin Index (%) 185 113 CHEYENNE RIVER BASIN Blind Park 6890 8.6 6.2 139 12.5 12.3 102 North Rapid Creek 6130 7.3 6.0 122 9.9 10.3 96 ----- ----- Basin Index (%) 130 99 UPPER N. PLATTE Arapaho Ridge 10960 22.5 21.4 105 22.1 23.4 94 Blackhall Mtn 9820 30.1 -M * 28.9 -M * Columbine 9160 25.9 22.8 114 27.3 26.0 105 Divide Peak 8880 15.2 20.3 75 19.0 21.9 87 Joe Wright 10120 22.2 21.9 101 31.8 26.5 120 Laprele Creek 8375 6.9 9.4 73 8.9 12.9 69 Med Bow 10500 43.7 -M * 31.2 -M * North French Creek 10130 31.0 31.0 100 29.7 27.4 108 Never Summer 10280 21.4 20.5 104 17.5 -M * Old Battle 10000 27.3 32.0 85 25.8 35.6 72 Rawah 9020 11.6 10.2 114 16.1 14.9 108 Sage Creek Basin 7850 6.0 10.3 58 11.1 14.9 74 Sand Lake 10050 29.5 30.0 98 25.1 25.5 98 South Brush Creek 8440 10.8 11.5 94 13.0 15.7 83 Tower 10500 41.7 47.1 89 -M 40.5 * Webber Springs 9250 19.1 23.4 82 22.7 27.3 83 Willow Creek Pass 9540 14.2 12.5 114 15.1 13.8 109 Zirkel 9340 27.8 25.1 111 33.3 29.1 114 ----- ----- Basin Index (%) 95 96 SWEETWATER Deer Park 9700 13.0 16.2 80 16.3 20.5 80 Larsen Creek 9000 11.6 11.1 105 12.0 -M * South Pass 9040 12.3 15.8 78 -M 17.8 * ----- ----- Basin Index (%) 86 80* LOWER N. PLATTE Casper Mtn. 7900 8.5 14.5 59 7.3 15.6 47 Laprele Creek 8375 6.9 9.4 73 8.9 12.9 69 Reno Hill 8400 10.5 14.2 74 12.4 16.1 77 Windy Peak 7900 6.8 7.5 91 9.2 10.9 84 ----- ----- Basin Index (%) 72 68 LARAMIE RIVER Brooklyn Lake 10240 27.2 22.3 122 27.0 21.7 124 Cinnabar Park 9574 22.7 21.4 106 26.1 24.8 105 Crow Creek 8330 4.1 5.9 69 11.8 11.3 104 Deadman Hill 10220 21.9 16.6 132 20.7 17.9 116 Rawah 9020 11.6 10.2 114 16.1 14.9 108 Roach 9700 14.2 16.5 86 18.1 19.7 92 ----- ----- Basin Index (%) 109 109 S. PLATTE Black Mountain 8920 10.7 -M * 14.2 -M * Crow Creek 8330 4.1 5.9 69 11.8 11.3 104 Deadman Hill 10220 21.9 16.6 132 20.7 17.9 116 ----- ----- Basin Index (%) 116 111 LITTLE SNAKE RIVER Battle Mountain 7440 4.6 8.0 58 11.9 15.3 78 Divide Peak 8880 15.2 20.3 75 19.0 21.9 87 Elk River 8700 15.6 18.2 86 18.0 20.5 88 Little Snake River 8915 22.5 26.0 87 29.8 30.6 97 Old Battle 10000 27.3 32.0 85 25.8 35.6 72 Sage Creek Basin 7850 6.0 10.3 58 11.1 14.9 74 Sandstone RS 8150 8.8 12.5 70 10.3 18.7 55 Whiskey Park 8950 26.3 27.6 95 27.4 28.4 96 ----- ----- Basin Index (%) 82 82 UPPER GREEN RIVER Big Sandy Opening 9080 13.9 12.9 108 13.8 13.5 102 Blind Bull Sum 8650 36.6 23.6 155 21.7 19.6 111 East Rim Divide 7930 12.6 10.1 125 13.3 11.8 113 Elkhart Park G.S. 9400 13.5 12.3 110 12.7 13.5 94 Gros Ventre Summit 8750 17.5 12.8 137 16.6 13.1 127 Gunsight Pass 9820 19.0 13.7 139 18.0 14.1 128 Kendall R.S. 7740 14.9 10.7 139 16.9 14.3 118 Loomis Park 8240 19.1 13.7 139 19.9 17.4 114 New Fork Lake 8340 12.0 9.9 121 12.3 10.9 113 Pocket Creek 9360 9.7 -M * 9.8 -M * Snider Basin 8060 11.7 12.2 96 15.5 14.3 108 Spring Creek Divide 9000 28.2 22.9 123 26.3 24.0 110 Triple Peak 8500 34.7 20.7 168 33.9 25.5 133 ----- ----- Basin Index (%) 133 115 LOWER GREEN RIVER Blacks Fork Jct 8869 5.9 -M * 9.4 -M * Buck Pasture 9632 11.3 -M * 13.9 -M * EF Blacks Fork GS 9360 9.4 -M * -M -M * Hams Fork 7840 8.5 9.5 89 10.1 11.5 88 Hewinta 9500 6.6 10.5 63 11.8 14.4 82 Hickerson Park 9122 4.8 7.5 64 8.1 10.6 76 Hole-in-Rock 9168 6.1 7.1 86 8.8 10.1 87 Indian Creek 9425 24.0 24.6 98 17.2 22.8 75 Kelley R.S. 8180 14.0 14.2 99 15.5 18.3 85 Spirit Lk 10235 10.0 -M * 12.4 -M * Steel Creek Park 10158 13.4 16.1 83 14.6 17.0 86 ----- ----- Basin Index (%) 86 82 UPPER BEAR RIVER Bear River RS 8777 3.0 -M * 10.8 -M * Bug Lake 7987 13.7 19.1 72 17.0 19.7 86 Burts Miller Ranch 8000 .1 -M * 6.4 -M * Chalk Creek #1 9171 14.4 24.7 58 16.9 25.8 66 Hayden Fork 9130 9.1 14.7 62 17.0 21.5 79 Kelley R.S. 8180 14.0 14.2 99 15.5 18.3 85 Lily Lake 9133 8.4 12.7 66 12.3 17.6 70 Monte Cristo 8932 22.8 27.8 82 23.1 26.5 87 Salt River Summit 7640 10.4 12.1 86 13.9 16.8 83 ----- ----- Basin Index (%) 74 79 ----------------------------------------------------------------------------- -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.