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 WEDNESDAY: APRIL 18 , 2018 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 19.2 12.2 157 24.6 21.6 114 Black Bear 8170 43.8 36.8 119 44.7 39.5 113 Blind Bull Sum 8650 37.1 23.9 155 21.9 20.1 109 Cottonwood Creek 7670 24.9 19.1 130 29.6 25.5 116 East Rim Divide 7930 11.9 9.6 124 13.3 12.1 110 Grand Targhee 9260 54.6 41.7 131 32.2 32.3 100 Granite Creek 6770 17.6 11.4 154 23.9 20.2 118 Grassy Lake 7265 34.3 31.5 109 39.3 37.1 106 Gros Ventre Summit 8750 17.4 13.2 132 16.7 13.5 124 Gunsight Pass 9820 19.3 13.5 143 18.4 14.6 126 Lewis Lake Divide 7850 45.0 30.2 149 -M 36.5 * Phillips Bench 8200 33.1 25.8 128 32.1 28.9 111 Salt River Summit 7640 10.0 10.3 97 14.1 17.2 82 Snake River Station 6920 18.2 11.7 156 26.2 23.3 112 Spring Creek Divide 9000 28.9 23.5 123 26.9 24.6 109 Thumb Divide 7980 21.2 14.5 146 21.3 19.5 109 Togwotee Pass 9580 36.1 23.5 154 36.6 25.4 144 Two Ocean Plateau 9240 42.3 27.8 152 31.1 28.2 110 Willow Creek 8080 38.3 26.8 143 40.3 34.9 115 Younts Peak 8350 -M 15.0 * -M 16.4 * ----- ----- Basin Index (%) 136 112 MADISON-GALLATIN Black Bear 8170 43.8 36.8 119 44.7 39.5 113 Canyon 7870 18.6 12.4 150 21.2 16.8 126 Madison Plateau 7750 29.6 22.8 130 29.7 27.2 109 West Yellowstone 6700 12.2 8.0 152 18.3 14.9 123 Whiskey Creek 6800 16.7 15.1 111 21.7 21.0 103 ----- ----- Basin Index (%) 127 114 YELLOWSTONE Beartooth Lake 9360 42.0 23.0 183 38.7 20.5 189 Burnt Mtn 5880 7.5 .0 * 16.0 13.9 115 Canyon 7870 18.6 12.4 150 21.2 16.8 126 Cole Creek 7850 16.8 16.0 105 -M 14.2 * Evening Star 9200 44.9 25.0 180 -M 28.4 * Fisher Creek 9100 57.1 32.2 177 50.9 33.0 154 Northeast Entrance 7350 15.5 7.3 212 19.9 12.8 155 Parker Peak 9400 37.7 20.8 181 32.4 18.5 175 Sylvan Lake 8420 28.8 20.3 142 30.6 23.3 131 Thumb Divide 7980 21.2 14.5 146 21.3 19.5 109 Two Ocean Plateau 9240 42.3 27.8 152 31.1 28.2 110 White Mill 8700 45.5 23.6 193 35.2 24.7 143 Wolverine 7650 23.7 7.8 304 23.1 12.7 182 ----- ----- Basin Index (%) 174 143 WIND RIVER Burroughs Creek 8750 17.9 -M * 19.5 -M * Castle Creek 8400 8.0 -M * 10.6 -M * Cold Springs 9630 9.8 5.1 192 10.6 10.7 99 Deer Park 9700 12.9 16.1 80 16.2 21.1 77 Hobbs Park 10100 18.5 14.8 125 16.0 14.5 110 Kirwin 9550 21.0 10.0 210 19.5 12.2 160 Little Warm 9370 17.8 10.2 175 18.8 13.7 137 Owl Creek 8975 4.4 4.4 100 7.1 6.6 108 South Pass 9040 12.1 15.7 77 -M 18.3 * St. Lawrence Alt 8620 -M 5.7 * 8.8 9.7 91 Togwotee Pass 9580 36.1 23.5 154 36.6 25.4 144 Townsend Creek 8700 6.9 9.7 71 9.7 13.0 75 ----- ----- Basin Index (%) 127 113 BIGHORN BASIN Bald Mtn. 9380 24.3 19.6 124 18.2 17.9 102 Bear Trap Meadow 8200 10.2 3.8 268 11.8 9.2 128 Bone Springs Div 9350 22.4 16.3 137 17.1 16.5 104 Grave Springs 8550 8.3 9.7 86 -M 11.3 * Kirwin 9550 21.0 10.0 210 19.5 12.2 160 Marquette 8760 7.3 -M * 11.1 -M * Middle Powder 7760 10.9 12.5 87 -M 12.5 * Owl Creek 8975 4.4 4.4 100 7.1 6.6 108 Powder River Pass 9480 17.3 10.1 171 17.1 13.5 127 Shell Creek 9580 23.2 15.3 152 17.8 14.6 122 Timber Creek 7950 1.5 5.1 29 -M 8.2 * ----- ----- Basin Index (%) 134 120 SHOSHONE RIVER Blackwater 9780 37.6 23.8 158 35.1 21.6 162 Evening Star 9200 44.9 25.0 180 -M 28.4 * Marquette 8760 7.3 -M * 11.1 -M * Sylvan Road 7120 15.3 10.2 150 24.5 17.4 141 Younts Peak 8350 -M 15.0 * -M 16.4 * ----- ----- Basin Index (%) 166 153* POWDER RIVER Bear Trap Meadow 8200 10.2 3.8 268 11.8 9.2 128 Cloud Peak Reservoir 9860 17.7 15.6 113 16.3 14.5 112 Grave Springs 8550 8.3 9.7 86 -M 11.3 * Hansen Sawmill 8360 9.6 5.2 185 11.8 9.3 127 Middle Powder 7760 10.9 12.5 87 -M 12.5 * Powder River Pass 9480 17.3 10.1 171 17.1 13.5 127 Soldier Park 8720 8.5 -M * 11.4 -M * ----- ----- Basin Index (%) 130 123 TONGUE RIVER Big Goose 7990 9.6 9.5 101 10.5 12.3 85 Bone Springs Div 9350 22.4 16.3 137 17.1 16.5 104 Burgess Junction 7880 11.8 12.3 96 10.3 13.2 78 Dome Lake 8880 16.9 11.9 142 14.3 14.6 98 Little Goose 8870 11.7 -M * 14.4 -M * Sucker Creek 8880 12.9 12.7 102 11.2 15.5 72 Tie Creek 6870 5.3 4.5 118 11.0 12.6 87 ----- ----- Basin Index (%) 117 88 BELLE FOURCHE Cole Canyon 5910 7.5 2.4 312 12.0 10.1 119 ----- ----- Basin Index (%) 312 119 CHEYENNE RIVER BASIN Blind Park 6890 7.6 4.4 173 13.2 12.6 105 North Rapid Creek 6130 6.5 4.6 141 10.4 10.5 99 ----- ----- Basin Index (%) 157 102 UPPER N. PLATTE Arapaho Ridge 10960 22.7 21.4 106 22.7 24.0 95 Blackhall Mtn 9820 29.8 -M * 29.5 -M * Columbine 9160 24.4 21.0 116 28.0 26.6 105 Divide Peak 8880 14.6 19.3 76 19.7 22.5 88 Joe Wright 10120 23.2 22.1 105 33.2 27.4 121 Laprele Creek 8375 6.4 8.6 74 9.3 13.4 69 Med Bow 10500 39.5 -M * 37.4 -M * North French Creek 10130 31.5 32.0 98 30.8 28.1 110 Never Summer 10280 21.7 20.6 105 18.1 -M * Old Battle 10000 27.8 32.4 86 26.1 36.6 71 Rawah 9020 11.0 8.9 124 16.4 15.5 106 Sage Creek Basin 7850 3.6 7.1 51 11.4 15.1 75 Sand Lake 10050 30.0 30.4 99 25.8 26.4 98 South Brush Creek 8440 9.2 10.1 91 13.3 16.2 82 Tower 10500 43.3 47.7 91 28.0 41.6 67 Webber Springs 9250 18.5 22.6 82 23.4 28.1 83 Willow Creek Pass 9540 14.4 12.8 112 15.5 14.2 109 Zirkel 9340 26.0 23.0 113 34.2 29.5 116 ----- ----- Basin Index (%) 97 92 SWEETWATER Deer Park 9700 12.9 16.1 80 16.2 21.1 77 Larsen Creek 9000 10.4 10.5 99 11.9 -M * South Pass 9040 12.1 15.7 77 -M 18.3 * ----- ----- Basin Index (%) 84 77* LOWER N. PLATTE Casper Mtn. 7900 8.9 14.5 61 7.7 16.2 48 Laprele Creek 8375 6.4 8.6 74 9.3 13.4 69 Reno Hill 8400 11.1 14.0 79 13.2 16.8 79 Windy Peak 7900 6.3 6.9 91 9.4 11.4 82 ----- ----- Basin Index (%) 74 69 LARAMIE RIVER Brooklyn Lake 10240 27.4 22.1 124 27.6 22.4 123 Cinnabar Park 9574 22.2 20.5 108 26.8 25.2 106 Crow Creek 8330 2.7 1.7 159 12.1 11.9 102 Deadman Hill 10220 22.4 16.6 135 21.5 18.6 116 Rawah 9020 11.0 8.9 124 16.4 15.5 106 Roach 9700 14.1 16.5 85 18.4 20.3 91 ----- ----- Basin Index (%) 116 108 S. PLATTE Black Mountain 8920 10.2 -M * 14.5 -M * Crow Creek 8330 2.7 1.7 159 12.1 11.9 102 Deadman Hill 10220 22.4 16.6 135 21.5 18.6 116 ----- ----- Basin Index (%) 137 110 LITTLE SNAKE RIVER Battle Mountain 7440 2.8 5.4 52 -M 15.8 * Divide Peak 8880 14.6 19.3 76 19.7 22.5 88 Elk River 8700 14.1 16.1 88 18.3 21.0 87 Little Snake River 8915 22.0 25.0 88 30.5 31.0 98 Old Battle 10000 27.8 32.4 86 26.1 36.6 71 Sage Creek Basin 7850 3.6 7.1 51 11.4 15.1 75 Sandstone RS 8150 7.3 10.8 68 10.5 19.2 55 Whiskey Park 8950 25.7 26.2 98 28.3 29.3 97 ----- ----- Basin Index (%) 83 83 UPPER GREEN RIVER Big Sandy Opening 9080 13.6 12.7 107 13.9 13.9 100 Blind Bull Sum 8650 37.1 23.9 155 21.9 20.1 109 East Rim Divide 7930 11.9 9.6 124 13.3 12.1 110 Elkhart Park G.S. 9400 13.4 12.0 112 12.8 13.9 92 Gros Ventre Summit 8750 17.4 13.2 132 16.7 13.5 124 Gunsight Pass 9820 19.3 13.5 143 18.4 14.6 126 Kendall R.S. 7740 13.6 9.0 151 16.8 14.6 115 Loomis Park 8240 18.4 13.2 139 20.1 17.8 113 New Fork Lake 8340 11.1 9.2 121 12.4 11.2 111 Pocket Creek 9360 9.6 -M * 9.9 -M * Snider Basin 8060 10.3 11.1 93 15.6 14.6 107 Spring Creek Divide 9000 28.9 23.5 123 26.9 24.6 109 Triple Peak 8500 35.4 19.3 183 34.9 26.1 134 ----- ----- Basin Index (%) 135 114 LOWER GREEN RIVER Blacks Fork Jct 8869 5.6 -M * 10.2 -M * Buck Pasture 9632 12.3 -M * 15.4 -M * EF Blacks Fork GS 9360 10.1 -M * -M -M * Hams Fork 7840 7.8 7.5 104 10.4 11.9 87 Hewinta 9500 6.5 8.7 75 12.4 14.8 84 Hickerson Park 9122 3.3 5.8 57 8.1 10.9 74 Hole-in-Rock 9168 5.3 6.2 85 8.8 10.4 85 Indian Creek 9425 24.7 23.3 106 17.5 23.3 75 Kelley R.S. 8180 14.1 13.1 108 16.1 18.7 86 Spirit Lk 10235 10.4 -M * 12.5 -M * Steel Creek Park 10158 15.5 16.1 96 15.8 17.5 90 ----- ----- Basin Index (%) 96 83 UPPER BEAR RIVER Bear River RS 8777 2.7 -M * 11.6 -M * Bug Lake 7987 14.4 18.0 80 17.7 20.1 88 Burts Miller Ranch 8000 .3 -M * 6.5 -M * Chalk Creek #1 9171 15.3 24.8 62 18.0 26.4 68 Hayden Fork 9130 9.3 12.6 74 17.9 22.1 81 Kelley R.S. 8180 14.1 13.1 108 16.1 18.7 86 Lily Lake 9133 9.4 11.3 83 12.5 18.1 69 Monte Cristo 8932 24.2 27.6 88 24.2 27.0 90 Salt River Summit 7640 10.0 10.3 97 14.1 17.2 82 ----- ----- Basin Index (%) 82 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.