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: APRIL 21 , 2018 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 18.0 11.7 154 24.6 21.8 113 Black Bear 8170 43.1 36.9 117 44.8 40.0 112 Blind Bull Sum 8650 37.6 24.1 156 21.9 20.3 108 Cottonwood Creek 7670 23.7 18.3 130 29.8 26.0 115 East Rim Divide 7930 10.8 9.4 115 13.4 12.3 109 Grand Targhee 9260 54.6 42.2 129 32.4 32.8 99 Granite Creek 6770 16.4 10.5 156 24.0 20.4 118 Grassy Lake 7265 34.0 31.1 109 39.4 37.6 105 Gros Ventre Summit 8750 16.8 13.2 127 16.8 13.8 122 Gunsight Pass 9820 19.0 13.7 139 18.4 15.0 123 Lewis Lake Divide 7850 45.3 30.5 149 -M 37.0 * Phillips Bench 8200 33.1 25.4 130 32.1 29.3 110 Salt River Summit 7640 9.0 9.4 96 14.2 17.4 82 Snake River Station 6920 17.0 11.1 153 26.1 23.6 111 Spring Creek Divide 9000 29.1 23.5 124 27.1 24.9 109 Thumb Divide 7980 20.4 14.4 142 21.2 19.8 107 Togwotee Pass 9580 35.8 24.0 149 36.8 25.8 143 Two Ocean Plateau 9240 42.8 28.3 151 33.5 28.7 117 Willow Creek 8080 38.5 26.7 144 40.4 35.4 114 Younts Peak 8350 -M 15.2 * -M 16.7 * ----- ----- Basin Index (%) 135 112 MADISON-GALLATIN Black Bear 8170 43.1 36.9 117 44.8 40.0 112 Canyon 7870 18.2 12.2 149 21.3 17.1 125 Madison Plateau 7750 29.6 22.9 129 29.7 27.6 108 West Yellowstone 6700 10.8 7.0 154 18.3 15.2 120 Whiskey Creek 6800 16.4 15.4 106 21.7 21.3 102 ----- ----- Basin Index (%) 125 112 YELLOWSTONE Beartooth Lake 9360 42.0 23.5 179 38.8 20.8 187 Burnt Mtn 5880 6.2 .0 * 16.2 14.4 112 Canyon 7870 18.2 12.2 149 21.3 17.1 125 Cole Creek 7850 16.5 16.4 101 -M 14.7 * Evening Star 9200 45.1 24.7 183 -M 28.9 * Fisher Creek 9100 56.9 32.6 175 51.2 33.5 153 Northeast Entrance 7350 14.3 6.4 223 19.9 13.0 153 Parker Peak 9400 38.0 21.1 180 32.7 18.8 174 Sylvan Lake 8420 28.4 20.4 139 30.7 23.7 130 Thumb Divide 7980 20.4 14.4 142 21.2 19.8 107 Two Ocean Plateau 9240 42.8 28.3 151 33.5 28.7 117 White Mill 8700 45.6 23.7 192 35.3 25.0 141 Wolverine 7650 22.7 6.9 329 23.1 12.9 179 ----- ----- Basin Index (%) 172 142 WIND RIVER Burroughs Creek 8750 17.4 -M * 19.7 -M * Castle Creek 8400 7.0 -M * 10.7 -M * Cold Springs 9630 8.7 4.3 202 10.9 11.0 99 Deer Park 9700 13.0 16.3 80 16.6 21.7 76 Hobbs Park 10100 18.9 14.9 127 16.4 14.9 110 Kirwin 9550 20.3 10.0 203 19.6 12.5 157 Little Warm 9370 17.4 10.0 174 18.9 14.0 135 Owl Creek 8975 3.7 3.7 100 7.2 6.9 104 South Pass 9040 12.2 15.4 79 -M 18.7 * St. Lawrence Alt 8620 -M 5.2 * 8.9 10.0 89 Togwotee Pass 9580 35.8 24.0 149 36.8 25.8 143 Townsend Creek 8700 6.8 9.3 73 10.1 13.4 75 ----- ----- Basin Index (%) 127 112 BIGHORN BASIN Bald Mtn. 9380 24.4 19.9 123 18.4 18.3 101 Bear Trap Meadow 8200 9.9 2.9 341 11.9 9.5 125 Bone Springs Div 9350 22.4 16.1 139 17.2 16.9 102 Grave Springs 8550 8.2 9.5 86 -M 11.8 * Kirwin 9550 20.3 10.0 203 19.6 12.5 157 Marquette 8760 7.2 -M * 11.2 -M * Middle Powder 7760 10.8 12.4 87 -M 12.9 * Owl Creek 8975 3.7 3.7 100 7.2 6.9 104 Powder River Pass 9480 17.1 10.2 168 17.3 13.8 125 Shell Creek 9580 23.3 15.4 151 18.0 14.9 121 Timber Creek 7950 .4 4.6 9 -M 8.5 * ----- ----- Basin Index (%) 134 118 SHOSHONE RIVER Blackwater 9780 37.7 23.8 158 35.2 21.9 161 Evening Star 9200 45.1 24.7 183 -M 28.9 * Marquette 8760 7.2 -M * 11.2 -M * Sylvan Road 7120 14.2 9.5 149 24.6 17.7 139 Younts Peak 8350 -M 15.2 * -M 16.7 * ----- ----- Basin Index (%) 167 151* POWDER RIVER Bear Trap Meadow 8200 9.9 2.9 341 11.9 9.5 125 Cloud Peak Reservoir 9860 17.8 15.9 112 16.5 15.0 110 Grave Springs 8550 8.2 9.5 86 -M 11.8 * Hansen Sawmill 8360 9.6 4.6 209 11.8 9.7 122 Middle Powder 7760 10.8 12.4 87 -M 12.9 * Powder River Pass 9480 17.1 10.2 168 17.3 13.8 125 Soldier Park 8720 7.9 -M * 11.4 -M * ----- ----- Basin Index (%) 132 120 TONGUE RIVER Big Goose 7990 9.6 9.2 104 10.8 12.8 84 Bone Springs Div 9350 22.4 16.1 139 17.2 16.9 102 Burgess Junction 7880 11.8 12.6 94 10.6 13.6 78 Dome Lake 8880 16.7 11.8 142 14.4 15.0 96 Little Goose 8870 11.5 -M * 14.5 -M * Sucker Creek 8880 12.9 12.7 102 11.5 15.9 72 Tie Creek 6870 5.2 4.2 124 11.0 13.0 85 ----- ----- Basin Index (%) 118 87 BELLE FOURCHE Cole Canyon 5910 6.7 1.8 372 12.0 10.5 114 ----- ----- Basin Index (%) 372 114 CHEYENNE RIVER BASIN Blind Park 6890 7.0 4.0 175 13.3 13.2 101 North Rapid Creek 6130 5.8 4.0 145 10.5 11.2 94 ----- ----- Basin Index (%) 160 98 UPPER N. PLATTE Arapaho Ridge 10960 23.8 21.3 112 23.5 24.4 96 Blackhall Mtn 9820 30.1 -M * 30.0 -M * Columbine 9160 24.6 20.6 119 28.7 27.0 106 Divide Peak 8880 14.7 18.6 79 20.2 22.9 88 Joe Wright 10120 23.4 22.4 104 33.7 27.9 121 Laprele Creek 8375 5.6 7.8 72 9.5 13.8 69 Med Bow 10500 39.3 -M * 37.7 -M * North French Creek 10130 31.3 32.0 98 31.0 28.7 108 Never Summer 10280 22.5 20.7 109 18.7 -M * Old Battle 10000 28.0 32.9 85 26.5 37.2 71 Rawah 9020 10.4 8.3 125 16.9 15.6 108 Sage Creek Basin 7850 2.4 5.4 44 11.5 15.3 75 Sand Lake 10050 30.3 30.6 99 26.0 27.0 96 South Brush Creek 8440 8.0 9.7 82 13.5 16.5 82 Tower 10500 43.5 48.2 90 -M 42.3 * Webber Springs 9250 18.2 21.8 83 23.7 28.5 83 Willow Creek Pass 9540 14.8 13.3 111 16.0 14.5 110 Zirkel 9340 25.6 22.6 113 34.5 29.8 116 ----- ----- Basin Index (%) 97 96 SWEETWATER Deer Park 9700 13.0 16.3 80 16.6 21.7 76 Larsen Creek 9000 10.0 10.2 98 12.1 -M * South Pass 9040 12.2 15.4 79 -M 18.7 * ----- ----- Basin Index (%) 84 76* LOWER N. PLATTE Casper Mtn. 7900 8.9 14.4 62 8.0 16.7 48 Laprele Creek 8375 5.6 7.8 72 9.5 13.8 69 Reno Hill 8400 11.3 14.0 81 13.5 17.3 78 Windy Peak 7900 5.8 6.5 89 9.8 11.7 84 ----- ----- Basin Index (%) 74 69 LARAMIE RIVER Brooklyn Lake 10240 27.5 22.3 123 28.0 22.9 122 Cinnabar Park 9574 22.4 20.0 112 27.2 25.4 107 Crow Creek 8330 2.0 .3 667* 12.3 12.0 102 Deadman Hill 10220 22.7 17.2 132 21.9 19.0 115 Rawah 9020 10.4 8.3 125 16.9 15.6 108 Roach 9700 14.4 16.6 87 19.0 20.7 92 ----- ----- Basin Index (%) 117 108 S. PLATTE Black Mountain 8920 10.1 -M * 14.8 -M * Crow Creek 8330 2.0 .3 667* 12.3 12.0 102 Deadman Hill 10220 22.7 17.2 132 21.9 19.0 115 ----- ----- Basin Index (%) 141* 110 LITTLE SNAKE RIVER Battle Mountain 7440 1.6 3.9 41 12.5 16.1 78 Divide Peak 8880 14.7 18.6 79 20.2 22.9 88 Elk River 8700 13.2 15.2 87 18.6 21.4 87 Little Snake River 8915 21.7 24.1 90 30.7 31.2 98 Old Battle 10000 28.0 32.9 85 26.5 37.2 71 Sage Creek Basin 7850 2.4 5.4 44 11.5 15.3 75 Sandstone RS 8150 6.4 10.0 64 11.0 19.6 56 Whiskey Park 8950 25.7 25.8 100 28.6 29.7 96 ----- ----- Basin Index (%) 84 83 UPPER GREEN RIVER Big Sandy Opening 9080 13.5 12.6 107 13.9 14.2 98 Blind Bull Sum 8650 37.6 24.1 156 21.9 20.3 108 East Rim Divide 7930 10.8 9.4 115 13.4 12.3 109 Elkhart Park G.S. 9400 13.3 11.9 112 13.1 14.1 93 Gros Ventre Summit 8750 16.8 13.2 127 16.8 13.8 122 Gunsight Pass 9820 19.0 13.7 139 18.4 15.0 123 Kendall R.S. 7740 12.1 8.1 149 16.8 14.8 114 Loomis Park 8240 17.1 12.8 134 20.2 18.0 112 New Fork Lake 8340 9.8 8.6 114 12.5 11.3 111 Pocket Creek 9360 9.5 -M * 10.0 -M * Snider Basin 8060 9.5 10.6 90 16.0 14.8 108 Spring Creek Divide 9000 29.1 23.5 124 27.1 24.9 109 Triple Peak 8500 35.7 19.2 186 34.9 26.5 132 ----- ----- Basin Index (%) 134 112 LOWER GREEN RIVER Blacks Fork Jct 8869 5.8 -M * 10.5 -M * Buck Pasture 9632 12.7 -M * 15.4 -M * EF Blacks Fork GS 9360 10.3 -M * 7.6 -M * Hams Fork 7840 6.5 6.4 102 11.1 12.1 92 Hewinta 9500 6.8 7.9 86 12.9 15.0 86 Hickerson Park 9122 3.5 5.3 66 9.2 11.1 83 Hole-in-Rock 9168 5.8 5.7 102 9.7 10.6 92 Indian Creek 9425 24.8 23.4 106 17.9 23.7 76 Kelley R.S. 8180 13.3 12.4 107 16.2 19.0 85 Spirit Lk 10235 11.2 -M * 13.6 -M * Steel Creek Park 10158 15.8 16.2 98 16.3 17.8 92 ----- ----- Basin Index (%) 99 85 UPPER BEAR RIVER Bear River RS 8777 1.5 -M * 11.7 -M * Bug Lake 7987 13.8 16.9 82 17.8 20.5 87 Burts Miller Ranch 8000 .4 -M * 6.7 -M * Chalk Creek #1 9171 15.4 24.5 63 18.0 26.9 67 Hayden Fork 9130 8.2 11.4 72 18.0 22.5 80 Kelley R.S. 8180 13.3 12.4 107 16.2 19.0 85 Lily Lake 9133 9.3 10.4 89 12.6 18.4 68 Monte Cristo 8932 24.0 27.4 88 24.4 27.5 89 Salt River Summit 7640 9.0 9.4 96 14.2 17.4 82 ----- ----- Basin Index (%) 83 80 ----------------------------------------------------------------------------- -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.