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: MAY 18 , 2017 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7030 8.3 .0 * 43.0 24.3 177 Black Bear 8170 45.6 34.8 131 61.3 44.4 138 Blind Bull Sum 8650 -M 21.0 * 39.3 23.1 170 Cottonwood Creek 7670 18.4 8.2 224 44.4 29.8 149 East Rim Divide 7930 .0 1.8 0 23.3 14.0 166 Grand Targhee 9260 54.9 43.4 126 52.5 36.7 143 Granite Creek 6770 8.7 .0 * 38.6 22.8 169 Grassy Lake 7265 25.2 19.5 129 62.2 41.7 149 Gros Ventre Summit 8750 -M 7.0 * -M 16.0 * Gunsight Pass 9820 19.9 11.4 175 29.0 17.6 165 Lewis Lake Divide 7850 35.8 23.8 150 60.0 40.8 147 Phillips Bench 8200 31.6 20.5 154 51.3 32.7 157 Salt River Summit 7760 3.2 .0 * 32.1 19.8 162 Snake River Station 6920 .0 .0 * 39.5 26.3 150 Spring Creek Divide 9000 37.4 21.5 174 45.4 27.9 163 Thumb Divide 7980 4.5 2.8 161 30.9 22.6 137 Togwotee Pass 9580 32.2 23.5 137 44.0 29.5 149 Two Ocean Plateau 9240 -M 28.7 * -M 32.6 * Willow Creek 8380 -M 18.2 * 59.3 40.6 146 Younts Peak 8350 2.7 12.5 22 33.5 19.3 174 ----- ----- Basin Index (%) 147 154 MADISON-GALLATIN Black Bear 8170 45.6 34.8 131 61.3 44.4 138 Canyon 7870 8.8 3.5 251 29.6 19.7 150 Madison Plateau 7750 19.1 15.3 125 41.0 31.3 131 West Yellowstone 6700 .0 .0 * 26.5 17.4 152 Whiskey Creek 6800 4.3 6.9 62 30.0 24.1 124 ----- ----- Basin Index (%) 129 138 YELLOWSTONE Beartooth Lake 9360 33.8 22.1 153 32.2 24.0 134 Burnt Mtn 5880 2.3 .0 * 21.8 18.9 115 Canyon 7870 8.8 3.5 251 29.6 19.7 150 Cole Creek 7850 14.4 16.7 86 17.1 19.3 89 Evening Star 9200 34.9 24.5 142 49.9 33.1 151 Fisher Creek 9100 50.0 33.3 150 53.1 38.1 139 Northeast Entrance 7350 .2 .0 * 23.8 15.3 156 Parker Peak 9400 34.8 20.6 169 41.0 22.2 185 Sylvan Lake 8420 16.5 15.9 104 43.2 27.3 158 Thumb Divide 7980 4.5 2.8 161 30.9 22.6 137 Two Ocean Plateau 9240 -M 28.7 * -M 32.6 * White Mill 8700 33.6 23.2 145 40.2 28.7 140 Wolverine 7650 .0 .0 * 24.5 15.4 159 ----- ----- Basin Index (%) 144 143 WIND RIVER Burroughs Creek 8750 8.5 -M * 29.5 -M * Castle Creek 8400 .0 -M * 18.2 -M * Cold Springs 9630 4.9 .0 * 22.7 14.3 159 Deer Park 9700 30.4 11.8 258 44.6 25.9 172 Hobbs Park 10100 29.6 14.0 211 34.8 19.1 182 Kirwin 9550 18.9 9.3 203 29.5 15.7 188 Little Warm 9370 11.4 4.2 271 27.6 17.3 160 Owl Creek 8975 .0 .0 * 15.8 9.5 166 South Pass 9040 27.2 8.5 320 34.1 22.3 153 St. Lawrence Alt 8620 -M .0 * 20.9 13.4 156 Togwotee Pass 9580 32.2 23.5 137 44.0 29.5 149 Townsend Creek 8700 11.5 .2 5750* 28.6 17.0 168 ----- ----- Basin Index (%) 232 164 BIGHORN BASIN Bald Mtn. 9380 20.5 20.0 102 22.6 21.9 103 Bear Trap Meadow 8200 .5 .0 * 16.2 12.5 130 Bone Springs Div 9350 17.8 15.0 119 22.7 20.7 110 Grave Springs 8550 4.4 4.4 100 14.1 14.9 95 Kirwin 9550 18.9 9.3 203 29.5 15.7 188 Marquette 8760 13.8 -M * 24.2 -M * Middle Powder 7760 4.0 7.0 57 15.1 16.2 93 Owl Creek 8975 .0 .0 * 15.8 9.5 166 Powder River Pass 9480 3.6 6.8 53 18.5 17.1 108 Shell Creek 9580 14.0 15.8 89 19.0 18.4 103 Timber Creek 7950 .7 .0 * 16.1 12.0 134 ----- ----- Basin Index (%) 108 119 SHOSHONE RIVER Blackwater 9780 39.6 24.8 160 47.5 25.7 185 Evening Star 9200 34.9 24.5 142 49.9 33.1 151 Marquette 8760 13.8 -M * 24.2 -M * Sylvan Road 7120 .0 .0 * 33.2 20.1 165 Younts Peak 8350 2.7 12.5 22 33.5 19.3 174 ----- ----- Basin Index (%) 125 167 POWDER RIVER Bear Trap Meadow 8200 .5 .0 * 16.2 12.5 130 Cloud Peak Reservoir 9860 17.7 15.5 114 27.4 19.4 141 Grave Springs 8550 4.4 4.4 100 14.1 14.9 95 Hansen Sawmill 8360 6.9 .0 * 20.4 12.7 161 Middle Powder 7760 4.0 7.0 57 15.1 16.2 93 Powder River Pass 9480 3.6 6.8 53 18.5 17.1 108 Soldier Park 8720 8.4 -M * 22.0 -M * ----- ----- Basin Index (%) 110 120 TONGUE RIVER Big Goose 7990 8.3 6.6 126 20.7 17.1 121 Bone Springs Div 9350 17.8 15.0 119 22.7 20.7 110 Burgess Junction 7880 6.4 9.3 69 16.4 16.8 98 Dome Lake 8880 13.8 7.8 177 23.9 18.9 126 Little Goose 8870 11.2 -M * 25.1 -M * Sucker Creek 8880 10.4 9.7 107 20.3 20.0 102 Tie Creek 6870 -M .0 * -M 17.2 * ----- ----- Basin Index (%) 117 111 BELLE FOURCHE Cole Canyon 5910 .0 .0 * 12.9 14.7 88 ----- ----- Basin Index (%) * 88 CHEYENNE RIVER BASIN Blind Park 6890 .0 .0 * 13.6 16.5 82 North Rapid Creek 6130 .0 .0 * 11.8 14.3 83 ----- ----- Basin Index (%) * 82 UPPER N. PLATTE Arapaho Ridge 10960 19.9 19.8 101 30.6 28.4 108 Blackhall Mtn 9820 27.5 -M * 42.5 -M * Columbine 9160 .0 5.2 0 32.5 30.5 107 Divide Peak 8880 .0 7.7 0 26.4 26.3 100 Joe Wright 10120 13.1 21.9 60 34.2 32.6 105 Laprele Creek 8375 .2 .0 * 15.7 16.8 93 Med Bow 10500 34.7 -M * 41.7 -M * North French Creek 10130 20.9 30.8 68 34.6 33.5 103 Never Summer 10280 20.8 21.3 98 23.5 -M * Old Battle 10000 35.5 33.4 106 43.4 41.9 104 Rawah 9020 .4 .7 57* 20.9 18.9 111 Sage Creek Basin 7850 -M .0 * 18.5 17.2 108 Sand Lake 10050 29.2 28.8 101 32.3 31.7 102 South Brush Creek 8440 .0 .4 0* 16.1 19.9 81 Tower 10500 37.5 48.6 77 52.0 47.6 109 Webber Springs 9250 11.0 13.9 79 37.8 31.9 118 Willow Creek Pass 9540 11.4 10.2 112 21.2 17.2 123 Zirkel 9340 9.8 13.0 75 47.7 33.3 143 ----- ----- Basin Index (%) 82 108 SWEETWATER Deer Park 9700 30.4 11.8 258 44.6 25.9 172 Larsen Creek 9000 .5 4.2 12 27.0 -M * South Pass 9040 27.2 8.5 320 34.1 22.3 153 ----- ----- Basin Index (%) 237 163 LOWER N. PLATTE Casper Mtn. 7900 .3 6.4 5 19.8 20.3 98 Laprele Creek 8375 .2 .0 * 15.7 16.8 93 Reno Hill 8400 .5 5.6 9 19.7 21.2 93 Windy Peak 7900 .0 .0 * 15.3 14.7 104 ----- ----- Basin Index (%) 8 97 LARAMIE RIVER Brooklyn Lake 10240 11.7 18.0 65 26.9 27.0 100 Cinnabar Park 9574 5.1 13.8 37 27.4 29.5 93 Crow Creek 8330 .2 .0 * 13.0 15.0 87 Deadman Hill 10220 14.1 17.6 80 26.0 22.8 114 Rawah 9020 .4 .7 57* 20.9 18.9 111 Roach 9700 7.7 12.6 61 26.2 24.5 107 ----- ----- Basin Index (%) 63 102 S. PLATTE Black Mountain 8920 .6 -M * 17.7 -M * Crow Creek 8330 .2 .0 * 13.0 15.0 87 Deadman Hill 10220 14.1 17.6 80 26.0 22.8 114 ----- ----- Basin Index (%) 81* 103 LITTLE SNAKE RIVER Battle Mountain 7440 .0 .0 * 19.8 18.5 107 Divide Peak 8880 .0 7.7 0 26.4 26.3 100 Elk River 8700 .4 .3 133* 23.8 24.5 97 Little Snake River 8915 11.4 15.5 74 44.0 35.0 126 Old Battle 10000 35.5 33.4 106 43.4 41.9 104 Sage Creek Basin 7850 -M .0 * 18.5 17.2 108 Sandstone RS 8150 .1 .0 * 19.1 22.4 85 Whiskey Park 8950 16.3 23.2 70 35.9 33.7 107 ----- ----- Basin Index (%) 80 105 UPPER GREEN RIVER Big Sandy Opening 9080 13.0 5.2 250 26.7 16.8 159 Blind Bull Sum 8650 -M 21.0 * 39.3 23.1 170 East Rim Divide 7930 .0 1.8 0 23.3 14.0 166 Elkhart Park G.S. 9400 12.5 6.9 181 27.4 16.6 165 Gros Ventre Summit 8750 -M 7.0 * -M 16.0 * Gunsight Pass 9820 19.9 11.4 175 29.0 17.6 165 Kendall R.S. 7740 .0 .0 * 31.7 16.7 190 Loomis Park 8240 14.0 4.0 350 35.4 20.4 174 New Fork Lake 8340 .0 .0 * 21.2 13.5 157 Pocket Creek 9360 -M -M * -M -M * Snider Basin 8060 -M 1.7 * 29.2 16.7 175 Spring Creek Divide 9000 37.4 21.5 174 45.4 27.9 163 Triple Peak 8500 23.5 10.3 228 45.0 30.1 150 ----- ----- Basin Index (%) 197 166 LOWER GREEN RIVER Blacks Fork Jct 8869 .0 -M * 19.4 -M * Buck Pasture 9632 4.8 -M * 28.1 -M * EF Blacks Fork GS 9360 -M -M * 23.4 -M * Hams Fork 7840 .0 .0 * 24.3 14.3 170 Hewinta 9500 .0 .0 * 21.4 17.6 122 Hickerson Park 9122 .4 .0 * 15.5 13.3 117 Hole-in-Rock 9168 .0 .0 * 16.0 12.9 124 Indian Creek 9425 34.3 20.0 172 45.8 26.9 170 Kelley R.S. 8180 7.4 4.3 172 34.7 21.6 161 Spirit Lk 10235 3.6 -M * 21.6 -M * Steel Creek Park 10158 15.8 15.5 102 25.9 20.9 124 ----- ----- Basin Index (%) 145* 144 UPPER BEAR RIVER Bear River RS 8777 .0 -M * 21.8 -M * Bug Lake 7987 19.6 7.4 265 38.4 23.3 165 Burts Miller Ranch 8000 .0 -M * 12.0 -M * Chalk Creek #1 9171 23.6 17.2 137 42.0 30.7 137 Hayden Fork 9130 .3 .4 75* 33.0 25.6 129 Kelley R.S. 8180 7.4 4.3 172 34.7 21.6 161 Lily Lake 9133 .0 .0 * 23.4 21.2 110 Monte Cristo 8932 27.7 16.7 166 46.0 31.4 146 Salt River Summit 7760 3.2 .0 * 32.1 19.8 162 ----- ----- Basin Index (%) 178* 144 ----------------------------------------------------------------------------- -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.