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: MAY 19 , 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 * 43.2 24.4 177 Black Bear 8170 45.7 34.3 133 61.6 44.6 138 Blind Bull Sum 8650 -M 20.5 * 39.5 23.1 171 Cottonwood Creek 7670 18.8 7.3 258 44.9 29.9 150 East Rim Divide 7930 .0 1.0 0* 23.4 14.1 166 Grand Targhee 9260 55.0 42.8 129 52.6 36.8 143 Granite Creek 6770 8.2 .0 * 38.7 22.9 169 Grassy Lake 7265 25.3 18.5 137 62.4 41.8 149 Gros Ventre Summit 8750 -M 6.3 * -M 16.0 * Gunsight Pass 9820 20.4 10.9 187 29.4 17.7 166 Lewis Lake Divide 7850 35.8 23.1 155 60.0 40.9 147 Phillips Bench 8200 31.9 19.9 160 51.3 32.8 156 Salt River Summit 7760 3.6 .0 * 32.5 19.9 163 Snake River Station 6920 .0 .0 * 39.6 26.4 150 Spring Creek Divide 9000 37.7 21.0 180 45.7 28.0 163 Thumb Divide 7980 4.7 2.0 235 31.1 22.7 137 Togwotee Pass 9580 32.8 23.2 141 44.3 29.6 150 Two Ocean Plateau 9240 -M 28.5 * -M 32.7 * Willow Creek 8380 -M 17.5 * 59.4 40.7 146 Younts Peak 8350 3.0 12.1 25 33.5 19.4 173 ----- ----- Basin Index (%) 153 154 MADISON-GALLATIN Black Bear 8170 45.7 34.3 133 61.6 44.6 138 Canyon 7870 8.9 2.8 318 29.7 19.8 150 Madison Plateau 7750 19.4 14.8 131 41.2 31.5 131 West Yellowstone 6700 .0 .0 * 26.7 17.5 153 Whiskey Creek 6800 4.5 6.3 71 30.3 24.2 125 ----- ----- Basin Index (%) 135 138 YELLOWSTONE Beartooth Lake 9360 33.9 21.9 155 32.6 24.1 135 Burnt Mtn 5880 3.0 .0 * 23.1 19.0 122 Canyon 7870 8.9 2.8 318 29.7 19.8 150 Cole Creek 7850 16.1 16.5 98 19.2 19.4 99 Evening Star 9200 35.4 24.1 147 50.7 33.2 153 Fisher Creek 9100 49.8 33.0 151 53.4 38.2 140 Northeast Entrance 7350 .0 .0 * 23.7 15.4 154 Parker Peak 9400 35.2 20.2 174 41.3 22.3 185 Sylvan Lake 8420 16.7 15.5 108 43.3 27.5 157 Thumb Divide 7980 4.7 2.0 235 31.1 22.7 137 Two Ocean Plateau 9240 -M 28.5 * -M 32.7 * White Mill 8700 33.6 22.8 147 40.5 28.8 141 Wolverine 7650 .0 .0 * 24.7 15.4 160 ----- ----- Basin Index (%) 149 145 WIND RIVER Burroughs Creek 8750 8.7 -M * 29.4 -M * Castle Creek 8400 .0 -M * 18.3 -M * Cold Springs 9630 6.7 .0 * 24.2 14.3 169 Deer Park 9700 31.6 11.1 285 45.8 25.9 177 Hobbs Park 10100 31.6 13.6 232 36.4 19.2 190 Kirwin 9550 19.6 8.8 223 30.2 15.8 191 Little Warm 9370 11.8 3.4 347 27.9 17.3 161 Owl Creek 8975 .9 .0 * 16.7 9.5 176 South Pass 9040 -M 7.7 * 35.4 22.4 158 St. Lawrence Alt 8620 1.7 .0 * 22.4 13.4 167 Togwotee Pass 9580 32.8 23.2 141 44.3 29.6 150 Townsend Creek 8700 13.3 .0 * 30.1 17.0 177 ----- ----- Basin Index (%) 250* 170 BIGHORN BASIN Bald Mtn. 9380 20.6 19.6 105 22.7 22.0 103 Bear Trap Meadow 8200 .6 .0 * 16.6 12.5 133 Bone Springs Div 9350 18.0 14.6 123 22.6 20.7 109 Grave Springs 8550 5.1 3.5 146 15.1 14.9 101 Kirwin 9550 19.6 8.8 223 30.2 15.8 191 Marquette 8760 15.8 -M * 25.9 -M * Middle Powder 7760 4.4 6.2 71 14.7 16.2 91 Owl Creek 8975 .9 .0 * 16.7 9.5 176 Powder River Pass 9480 3.7 6.0 62 18.7 17.2 109 Shell Creek 9580 14.0 15.6 90 19.1 18.4 104 Timber Creek 7950 2.3 .0 * 17.7 12.1 146 ----- ----- Basin Index (%) 120 122 SHOSHONE RIVER Blackwater 9780 39.8 24.5 162 48.1 25.8 186 Evening Star 9200 35.4 24.1 147 50.7 33.2 153 Marquette 8760 15.8 -M * 25.9 -M * Sylvan Road 7120 .0 .0 * 33.4 20.2 165 Younts Peak 8350 3.0 12.1 25 33.5 19.4 173 ----- ----- Basin Index (%) 129 168 POWDER RIVER Bear Trap Meadow 8200 .6 .0 * 16.6 12.5 133 Cloud Peak Reservoir 9860 17.9 15.2 118 27.8 19.5 143 Grave Springs 8550 5.1 3.5 146 15.1 14.9 101 Hansen Sawmill 8360 7.1 .0 * 18.9 12.8 148 Middle Powder 7760 4.4 6.2 71 14.7 16.2 91 Powder River Pass 9480 3.7 6.0 62 18.7 17.2 109 Soldier Park 8720 8.5 -M * 22.2 -M * ----- ----- Basin Index (%) 126 120 TONGUE RIVER Big Goose 7990 8.4 5.7 147 20.9 17.1 122 Bone Springs Div 9350 18.0 14.6 123 22.6 20.7 109 Burgess Junction 7880 6.4 8.7 74 16.4 16.9 97 Dome Lake 8880 13.8 7.0 197 24.1 19.0 127 Little Goose 8870 11.4 -M * 25.2 -M * Sucker Creek 8880 10.5 9.2 114 20.6 20.1 102 Tie Creek 6870 2.6 .0 * 24.1 17.2 140 ----- ----- Basin Index (%) 132 116 BELLE FOURCHE Cole Canyon 5910 .1 .0 * 13.1 14.8 89 ----- ----- Basin Index (%) * 89 CHEYENNE RIVER BASIN Blind Park 6890 .2 .0 * 13.8 16.6 83 North Rapid Creek 6130 .1 .0 * 11.9 14.4 83 ----- ----- Basin Index (%) * 83 UPPER N. PLATTE Arapaho Ridge 10960 21.0 19.0 111 31.8 28.4 112 Blackhall Mtn 9820 28.5 -M * 43.6 -M * Columbine 9160 1.2 4.0 30 33.7 30.5 110 Divide Peak 8880 .9 6.7 13 27.3 26.4 103 Joe Wright 10120 14.3 21.6 66 35.4 32.7 108 Laprele Creek 8375 1.1 .0 * 16.8 16.8 100 Med Bow 10500 35.4 -M * 42.1 -M * North French Creek 10130 21.5 30.2 71 35.1 33.6 104 Never Summer 10280 21.0 20.8 101 23.9 -M * Old Battle 10000 36.7 32.9 112 43.9 42.0 105 Rawah 9020 .8 .6 133* 21.3 18.9 113 Sage Creek Basin 7850 .5 .0 * 18.8 17.3 109 Sand Lake 10050 30.5 28.3 108 33.5 31.8 105 South Brush Creek 8440 .0 .4 0* 15.8 20.0 79 Tower 10500 39.5 48.2 82 53.5 47.7 112 Webber Springs 9250 11.5 13.0 88 38.7 32.0 121 Willow Creek Pass 9540 12.3 9.8 126 22.0 17.3 127 Zirkel 9340 -M 11.4 * 49.0 33.3 147 ----- ----- Basin Index (%) 90 111 SWEETWATER Deer Park 9700 31.6 11.1 285 45.8 25.9 177 Larsen Creek 9000 .9 3.9 23 27.4 -M * South Pass 9040 -M 7.7 * 35.4 22.4 158 ----- ----- Basin Index (%) 217 168 LOWER N. PLATTE Casper Mtn. 7900 1.9 5.4 35 20.7 20.3 102 Laprele Creek 8375 1.1 .0 * 16.8 16.8 100 Reno Hill 8400 1.9 4.6 41 20.6 21.3 97 Windy Peak 7900 2.0 .0 * 17.4 14.7 118 ----- ----- Basin Index (%) 69 103 LARAMIE RIVER Brooklyn Lake 10240 12.5 17.2 73 28.0 27.1 103 Cinnabar Park 9574 6.4 13.1 49 28.7 29.5 97 Crow Creek 8330 -M .0 * 15.0 15.1 99 Deadman Hill 10220 15.9 17.1 93 27.5 22.9 120 Rawah 9020 .8 .6 133* 21.3 18.9 113 Roach 9700 9.1 12.1 75 27.5 24.5 112 ----- ----- Basin Index (%) 74 107 S. PLATTE Black Mountain 8920 -M -M * 19.6 -M * Crow Creek 8330 -M .0 * 15.0 15.1 99 Deadman Hill 10220 15.9 17.1 93 27.5 22.9 120 ----- ----- Basin Index (%) 93* 112 LITTLE SNAKE RIVER Battle Mountain 7440 .2 .0 * 20.4 18.6 110 Divide Peak 8880 .9 6.7 13 27.3 26.4 103 Elk River 8700 .9 .0 * 24.4 24.5 100 Little Snake River 8915 12.0 14.4 83 44.6 35.0 127 Old Battle 10000 36.7 32.9 112 43.9 42.0 105 Sage Creek Basin 7850 .5 .0 * 18.8 17.3 109 Sandstone RS 8150 .1 .0 * 19.1 22.4 85 Whiskey Park 8950 17.9 22.6 79 36.9 33.8 109 ----- ----- Basin Index (%) 90 107 UPPER GREEN RIVER Big Sandy Opening 9080 13.3 4.2 317 26.8 16.8 160 Blind Bull Sum 8650 -M 20.5 * 39.5 23.1 171 East Rim Divide 7930 .0 1.0 0* 23.4 14.1 166 Elkhart Park G.S. 9400 12.6 6.2 203 27.5 16.7 165 Gros Ventre Summit 8750 -M 6.3 * -M 16.0 * Gunsight Pass 9820 20.4 10.9 187 29.4 17.7 166 Kendall R.S. 7740 .0 .0 * 31.7 16.7 190 Loomis Park 8240 14.4 3.3 436 35.4 20.5 173 New Fork Lake 8340 .0 .0 * 21.3 13.5 158 Pocket Creek 9360 -M -M * -M -M * Snider Basin 8060 .0 .8 0* 29.5 16.8 176 Spring Creek Divide 9000 37.7 21.0 180 45.7 28.0 163 Triple Peak 8500 23.9 9.5 252 45.3 30.1 150 ----- ----- Basin Index (%) 215* 166 LOWER GREEN RIVER Blacks Fork Jct 8869 .0 -M * 19.6 -M * Buck Pasture 9632 4.9 -M * 28.2 -M * EF Blacks Fork GS 9360 -M -M * 23.6 -M * Hams Fork 7840 .0 .0 * 24.7 14.3 173 Hewinta 9500 .0 .0 * 21.6 17.7 122 Hickerson Park 9122 .9 .0 * 16.0 13.4 119 Hole-in-Rock 9168 .1 .0 * 16.6 13.0 128 Indian Creek 9425 35.2 19.3 182 46.4 27.0 172 Kelley R.S. 8180 8.0 3.5 229 35.2 21.7 162 Spirit Lk 10235 4.2 -M * 22.1 -M * Steel Creek Park 10158 16.1 15.2 106 26.2 21.0 125 ----- ----- Basin Index (%) 159* 146 UPPER BEAR RIVER Bear River RS 8777 .0 -M * 21.9 -M * Bug Lake 7987 20.3 6.1 333 38.8 23.4 166 Burts Miller Ranch 8000 .0 -M * 12.1 -M * Chalk Creek #1 9171 24.0 16.4 146 42.1 30.8 137 Hayden Fork 9130 .3 .0 * 33.1 25.7 129 Kelley R.S. 8180 8.0 3.5 229 35.2 21.7 162 Lily Lake 9133 .1 .0 * 23.5 21.3 110 Monte Cristo 8932 28.2 15.8 178 46.3 31.5 147 Salt River Summit 7760 3.6 .0 * 32.5 19.9 163 ----- ----- Basin Index (%) 202* 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.