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 FRIDAY: APRIL 13 , 2018 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 19.7 14.0 141 24.3 21.2 115 Black Bear 8170 43.4 36.6 119 44.1 38.7 114 Blind Bull Sum 8650 36.7 23.7 155 21.7 19.7 110 Cottonwood Creek 7670 24.5 20.3 121 28.7 25.0 115 East Rim Divide 7930 12.5 10.1 124 13.2 11.9 111 Grand Targhee 9260 -M 40.4 * 31.6 31.4 101 Granite Creek 6770 18.3 13.0 141 23.7 19.8 120 Grassy Lake 7265 34.5 31.4 110 38.8 36.4 107 Gros Ventre Summit 8750 17.5 12.9 136 16.6 13.2 126 Gunsight Pass 9820 19.0 13.6 140 18.1 14.1 128 Lewis Lake Divide 7850 44.5 30.2 147 -M 35.8 * Phillips Bench 8200 32.9 26.0 127 31.7 28.4 112 Salt River Summit 7640 10.5 11.8 89 14.0 16.9 83 Snake River Station 6920 18.8 13.6 138 26.0 22.7 115 Spring Creek Divide 9000 28.5 23.0 124 26.6 24.1 110 Thumb Divide 7980 21.5 14.6 147 21.1 18.9 112 Togwotee Pass 9580 35.7 22.8 157 32.9 24.7 133 Two Ocean Plateau 9240 41.6 26.9 155 31.0 27.6 112 Willow Creek 8080 37.8 27.2 139 39.4 34.2 115 Younts Peak 8350 -M 14.6 * -M 16.0 * ----- ----- Basin Index (%) 134 113 MADISON-GALLATIN Black Bear 8170 43.4 36.6 119 44.1 38.7 114 Canyon 7870 18.5 12.3 150 21.1 16.5 128 Madison Plateau 7750 29.0 22.3 130 29.2 26.6 110 West Yellowstone 6700 12.2 8.5 144 18.2 14.3 127 Whiskey Creek 6800 16.8 14.6 115 21.4 20.5 104 ----- ----- Basin Index (%) 127 115 YELLOWSTONE Beartooth Lake 9360 41.9 22.0 190 38.5 20.1 192 Burnt Mtn 5880 8.0 1.7 471 15.9 13.3 120 Canyon 7870 18.5 12.3 150 21.1 16.5 128 Cole Creek 7850 16.1 15.4 105 -M 13.7 * Evening Star 9200 44.8 24.4 184 -M 27.8 * Fisher Creek 9100 56.7 31.7 179 50.5 32.2 157 Northeast Entrance 7350 16.0 8.4 190 19.8 12.5 158 Parker Peak 9400 37.1 20.2 184 30.4 18.0 169 Sylvan Lake 8420 28.6 19.8 144 30.2 22.7 133 Thumb Divide 7980 21.5 14.6 147 21.1 18.9 112 Two Ocean Plateau 9240 41.6 26.9 155 31.0 27.6 112 White Mill 8700 45.1 23.3 194 34.8 24.1 144 Wolverine 7650 24.1 9.1 265 22.9 12.4 185 ----- ----- Basin Index (%) 174 145 WIND RIVER Burroughs Creek 8750 18.0 -M * 19.3 -M * Castle Creek 8400 8.9 -M * 10.5 -M * Cold Springs 9630 10.5 6.0 175 10.3 10.3 100 Deer Park 9700 12.8 16.2 79 16.1 20.5 79 Hobbs Park 10100 18.5 14.9 124 15.6 14.1 111 Kirwin 9550 21.3 9.9 215 19.3 11.9 162 Little Warm 9370 17.9 10.3 174 18.5 13.2 140 Owl Creek 8975 4.6 5.4 85 6.7 6.3 106 South Pass 9040 12.2 15.8 77 -M 17.9 * St. Lawrence Alt 8620 -M 6.7 * 8.6 9.3 92 Togwotee Pass 9580 35.7 22.8 157 32.9 24.7 133 Townsend Creek 8700 7.3 10.0 73 9.4 12.7 74 ----- ----- Basin Index (%) 127 112 BIGHORN BASIN Bald Mtn. 9380 23.5 19.3 122 17.4 17.5 99 Bear Trap Meadow 8200 -M 4.6 * 11.7 8.9 131 Bone Springs Div 9350 21.8 17.0 128 16.8 16.0 105 Grave Springs 8550 8.2 9.6 85 -M 11.0 * Kirwin 9550 21.3 9.9 215 19.3 11.9 162 Marquette 8760 7.0 -M * 10.7 -M * Middle Powder 7760 10.4 12.4 84 -M 12.2 * Owl Creek 8975 4.6 5.4 85 6.7 6.3 106 Powder River Pass 9480 17.3 10.3 168 16.8 13.0 129 Shell Creek 9580 23.1 15.6 148 17.6 14.2 124 Timber Creek 7950 3.0 5.2 58 -M 7.7 * ----- ----- Basin Index (%) 127 121 SHOSHONE RIVER Blackwater 9780 37.4 23.5 159 -M 21.0 * Evening Star 9200 44.8 24.4 184 -M 27.8 * Marquette 8760 7.0 -M * 10.7 -M * Sylvan Road 7120 16.0 10.4 154 24.4 16.9 144 Younts Peak 8350 -M 14.6 * -M 16.0 * ----- ----- Basin Index (%) 168 144* POWDER RIVER Bear Trap Meadow 8200 -M 4.6 * 11.7 8.9 131 Cloud Peak Reservoir 9860 17.5 15.3 114 15.9 14.0 114 Grave Springs 8550 8.2 9.6 85 -M 11.0 * Hansen Sawmill 8360 9.8 6.1 161 11.7 9.0 130 Middle Powder 7760 10.4 12.4 84 -M 12.2 * Powder River Pass 9480 17.3 10.3 168 16.8 13.0 129 Soldier Park 8720 8.8 -M * 11.3 -M * ----- ----- Basin Index (%) 118 125 TONGUE RIVER Big Goose 7990 9.4 9.9 95 10.0 12.0 83 Bone Springs Div 9350 21.8 17.0 128 16.8 16.0 105 Burgess Junction 7880 11.5 12.2 94 9.7 12.9 75 Dome Lake 8880 16.8 12.0 140 13.8 14.2 97 Little Goose 8870 11.4 -M * 13.7 -M * Sucker Creek 8880 12.6 12.6 100 10.4 15.0 69 Tie Creek 6870 5.9 5.1 116 10.6 12.1 88 ----- ----- Basin Index (%) 113 87 BELLE FOURCHE Cole Canyon 5910 7.8 3.8 205 11.6 9.9 117 ----- ----- Basin Index (%) 205 117 CHEYENNE RIVER BASIN Blind Park 6890 8.5 5.8 147 12.8 12.4 103 North Rapid Creek 6130 7.1 5.9 120 10.1 10.3 98 ----- ----- Basin Index (%) 133 101 UPPER N. PLATTE Arapaho Ridge 10960 22.5 21.5 105 22.1 23.6 94 Blackhall Mtn 9820 29.8 -M * 28.8 -M * Columbine 9160 25.2 22.6 112 27.3 26.2 104 Divide Peak 8880 15.0 20.3 74 19.1 22.0 87 Joe Wright 10120 22.3 22.0 101 32.1 26.7 120 Laprele Creek 8375 6.6 9.3 71 8.8 13.0 68 Med Bow 10500 43.9 -M * -M -M * North French Creek 10130 31.1 31.2 100 30.2 27.5 110 Never Summer 10280 21.5 20.5 105 17.8 -M * Old Battle 10000 27.4 32.1 85 25.7 35.8 72 Rawah 9020 11.4 10.0 114 16.1 15.0 107 Sage Creek Basin 7850 5.5 9.9 56 11.1 15.0 74 Sand Lake 10050 29.5 30.1 98 25.2 25.6 98 South Brush Creek 8440 10.2 11.3 90 13.1 15.8 83 Tower 10500 42.2 47.2 89 -M 40.8 * Webber Springs 9250 19.0 23.4 81 22.8 27.4 83 Willow Creek Pass 9540 14.5 12.6 115 15.4 13.9 111 Zirkel 9340 27.1 24.7 110 33.4 29.1 115 ----- ----- Basin Index (%) 95 96 SWEETWATER Deer Park 9700 12.8 16.2 79 16.1 20.5 79 Larsen Creek 9000 11.2 11.0 102 11.8 -M * South Pass 9040 12.2 15.8 77 -M 17.9 * ----- ----- Basin Index (%) 84 79* LOWER N. PLATTE Casper Mtn. 7900 8.6 14.5 59 7.3 15.7 46 Laprele Creek 8375 6.6 9.3 71 8.8 13.0 68 Reno Hill 8400 10.4 14.2 73 12.3 16.2 76 Windy Peak 7900 6.6 7.5 88 9.2 11.0 84 ----- ----- Basin Index (%) 71 67 LARAMIE RIVER Brooklyn Lake 10240 27.0 22.3 121 27.0 21.8 124 Cinnabar Park 9574 22.5 21.3 106 26.2 24.8 106 Crow Creek 8330 3.5 5.5 64 11.8 11.4 104 Deadman Hill 10220 21.7 16.6 131 20.8 18.0 116 Rawah 9020 11.4 10.0 114 16.1 15.0 107 Roach 9700 14.2 16.5 86 18.1 19.9 91 ----- ----- Basin Index (%) 109 108 S. PLATTE Black Mountain 8920 10.4 -M * 14.1 -M * Crow Creek 8330 3.5 5.5 64 11.8 11.4 104 Deadman Hill 10220 21.7 16.6 131 20.8 18.0 116 ----- ----- Basin Index (%) 114 111 LITTLE SNAKE RIVER Battle Mountain 7440 4.3 7.7 56 -M 15.4 * Divide Peak 8880 15.0 20.3 74 19.1 22.0 87 Elk River 8700 15.2 17.8 85 18.0 20.6 87 Little Snake River 8915 22.5 26.0 87 29.9 30.7 97 Old Battle 10000 27.4 32.1 85 25.7 35.8 72 Sage Creek Basin 7850 5.5 9.9 56 11.1 15.0 74 Sandstone RS 8150 8.8 12.4 71 10.1 18.8 54 Whiskey Park 8950 26.0 27.5 95 27.6 28.5 97 ----- ----- Basin Index (%) 81 83 UPPER GREEN RIVER Big Sandy Opening 9080 13.8 12.9 107 13.8 13.6 101 Blind Bull Sum 8650 36.7 23.7 155 21.7 19.7 110 East Rim Divide 7930 12.5 10.1 124 13.2 11.9 111 Elkhart Park G.S. 9400 13.3 12.2 109 12.7 13.6 93 Gros Ventre Summit 8750 17.5 12.9 136 16.6 13.2 126 Gunsight Pass 9820 19.0 13.6 140 18.1 14.1 128 Kendall R.S. 7740 14.8 10.4 142 16.7 14.3 117 Loomis Park 8240 19.0 13.7 139 20.0 17.5 114 New Fork Lake 8340 11.9 9.8 121 12.3 10.9 113 Pocket Creek 9360 9.8 -M * 9.8 -M * Snider Basin 8060 11.6 12.0 97 15.5 14.4 108 Spring Creek Divide 9000 28.5 23.0 124 26.6 24.1 110 Triple Peak 8500 34.9 20.3 172 34.4 25.6 134 ----- ----- Basin Index (%) 134 115 LOWER GREEN RIVER Blacks Fork Jct 8869 6.0 -M * 9.9 -M * Buck Pasture 9632 11.8 -M * 14.4 -M * EF Blacks Fork GS 9360 9.8 -M * 7.0 -M * Hams Fork 7840 8.7 9.2 95 10.3 11.6 89 Hewinta 9500 6.7 10.3 65 11.9 14.5 82 Hickerson Park 9122 4.7 7.2 65 8.0 10.6 75 Hole-in-Rock 9168 6.1 7.1 86 8.6 10.1 85 Indian Creek 9425 24.3 24.3 100 17.4 22.9 76 Kelley R.S. 8180 14.2 14.0 101 15.9 18.3 87 Spirit Lk 10235 10.1 -M * 12.2 -M * Steel Creek Park 10158 14.9 16.1 93 15.1 17.1 88 ----- ----- Basin Index (%) 90 83 UPPER BEAR RIVER Bear River RS 8777 3.4 -M * 11.2 -M * Bug Lake 7987 14.5 19.2 76 17.6 19.8 89 Burts Miller Ranch 8000 .5 -M * 6.4 -M * Chalk Creek #1 9171 15.1 24.8 61 17.6 25.9 68 Hayden Fork 9130 9.8 14.4 68 17.4 21.6 81 Kelley R.S. 8180 14.2 14.0 101 15.9 18.3 87 Lily Lake 9133 9.0 12.7 71 12.0 17.7 68 Monte Cristo 8932 24.0 27.8 86 23.6 26.5 89 Salt River Summit 7640 10.5 11.8 89 14.0 16.9 83 ----- ----- Basin Index (%) 78 81 ----------------------------------------------------------------------------- -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.