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: MAY 17 , 2017 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7030 7.7 .0 * 42.3 24.2 175 Black Bear 8170 44.9 35.3 127 60.6 44.3 137 Blind Bull Sum 8650 -M 21.5 * 39.3 23.0 171 Cottonwood Creek 7670 18.1 8.9 203 44.2 29.6 149 East Rim Divide 7930 .0 2.6 0 23.1 14.0 165 Grand Targhee 9260 54.7 44.0 124 52.2 36.7 142 Granite Creek 6770 8.9 .0 * 38.5 22.7 170 Grassy Lake 7265 25.0 20.4 123 61.8 41.5 149 Gros Ventre Summit 8750 -M 7.6 * -M 15.9 * Gunsight Pass 9820 19.6 11.7 168 28.7 17.5 164 Lewis Lake Divide 7850 36.5 24.5 149 59.8 40.6 147 Phillips Bench 8200 31.7 21.0 151 51.2 32.6 157 Salt River Summit 7760 3.0 .6 500* 32.0 19.7 162 Snake River Station 6920 .0 .0 * 39.3 26.2 150 Spring Creek Divide 9000 37.5 22.0 170 45.2 27.8 163 Thumb Divide 7980 4.3 3.6 119 30.7 22.5 136 Togwotee Pass 9580 31.6 23.8 133 43.4 29.3 148 Two Ocean Plateau 9240 -M 29.0 * -M 32.4 * Willow Creek 8380 -M 18.8 * 58.1 40.4 144 Younts Peak 8350 2.1 12.9 16 33.8 19.2 176 ----- ----- Basin Index (%) 141 153 MADISON-GALLATIN Black Bear 8170 44.9 35.3 127 60.6 44.3 137 Canyon 7870 8.1 4.2 193 28.9 19.6 147 Madison Plateau 7750 18.9 15.9 119 40.6 31.1 131 West Yellowstone 6700 .0 .0 * 26.3 17.4 151 Whiskey Creek 6800 4.3 7.6 57 30.1 24.0 125 ----- ----- Basin Index (%) 121 137 YELLOWSTONE Beartooth Lake 9360 32.6 22.3 146 31.9 23.9 133 Burnt Mtn 5880 .0 .0 * 18.7 18.9 99 Canyon 7870 8.1 4.2 193 28.9 19.6 147 Cole Creek 7850 11.3 16.8 67 14.5 19.2 76 Evening Star 9200 34.5 24.9 139 49.6 32.9 151 Fisher Creek 9100 46.1 33.6 137 53.0 37.9 140 Northeast Entrance 7350 .0 .0 * 23.3 15.3 152 Parker Peak 9400 33.9 20.9 162 40.1 22.1 181 Sylvan Lake 8420 15.8 16.3 97 42.2 27.2 155 Thumb Divide 7980 4.3 3.6 119 30.7 22.5 136 Two Ocean Plateau 9240 -M 29.0 * -M 32.4 * White Mill 8700 33.2 23.7 140 40.1 28.6 140 Wolverine 7650 .0 .0 * 23.8 15.3 156 ----- ----- Basin Index (%) 132 140 WIND RIVER Burroughs Creek 8750 8.3 -M * 29.4 -M * Castle Creek 8400 .0 -M * 17.9 -M * Cold Springs 9630 4.6 .0 * 22.5 14.2 158 Deer Park 9700 30.1 12.4 243 44.1 25.7 172 Hobbs Park 10100 29.9 14.4 208 34.9 19.0 184 Kirwin 9550 18.4 9.7 190 29.4 15.6 188 Little Warm 9370 11.4 4.9 233 27.6 17.1 161 Owl Creek 8975 .0 .0 * 15.6 9.4 166 South Pass 9040 27.1 9.2 295 34.0 22.2 153 St. Lawrence Alt 8620 .0 .0 * 20.9 13.2 158 Togwotee Pass 9580 31.6 23.8 133 43.4 29.3 148 Townsend Creek 8700 11.6 .3 3867* 28.6 16.8 170 ----- ----- Basin Index (%) 220 165 BIGHORN BASIN Bald Mtn. 9380 19.5 20.3 96 21.7 21.8 100 Bear Trap Meadow 8200 .0 .0 * 15.4 12.4 124 Bone Springs Div 9350 17.8 15.3 116 22.5 20.5 110 Grave Springs 8550 4.7 5.2 90 13.9 14.8 94 Kirwin 9550 18.4 9.7 190 29.4 15.6 188 Marquette 8760 13.2 -M * 23.9 -M * Middle Powder 7760 4.4 7.7 57 15.1 16.0 94 Owl Creek 8975 .0 .0 * 15.6 9.4 166 Powder River Pass 9480 3.5 7.4 47 18.3 17.0 108 Shell Creek 9580 14.0 16.1 87 18.9 18.3 103 Timber Creek 7950 .0 .0 * 15.2 11.9 128 ----- ----- Basin Index (%) 101 118 SHOSHONE RIVER Blackwater 9780 38.7 24.9 155 46.7 25.6 182 Evening Star 9200 34.5 24.9 139 49.6 32.9 151 Marquette 8760 13.2 -M * 23.9 -M * Sylvan Road 7120 .0 .0 * 32.5 20.0 162 Younts Peak 8350 2.1 12.9 16 33.8 19.2 176 ----- ----- Basin Index (%) 120 166 POWDER RIVER Bear Trap Meadow 8200 .0 .0 * 15.4 12.4 124 Cloud Peak Reservoir 9860 16.8 15.8 106 26.6 19.3 138 Grave Springs 8550 4.7 5.2 90 13.9 14.8 94 Hansen Sawmill 8360 6.3 .0 * 20.0 12.6 159 Middle Powder 7760 4.4 7.7 57 15.1 16.0 94 Powder River Pass 9480 3.5 7.4 47 18.3 17.0 108 Soldier Park 8720 7.4 -M * 20.8 -M * ----- ----- Basin Index (%) 99 119 TONGUE RIVER Big Goose 7990 7.6 7.5 101 20.3 16.8 121 Bone Springs Div 9350 17.8 15.3 116 22.5 20.5 110 Burgess Junction 7880 6.2 9.8 63 16.3 16.7 98 Dome Lake 8880 13.3 8.5 156 22.8 18.7 122 Little Goose 8870 10.6 -M * 24.4 -M * Sucker Creek 8880 9.4 10.3 91 19.3 19.9 97 Tie Creek 6870 .1 .0 * 20.2 16.9 120 ----- ----- Basin Index (%) 106 111 BELLE FOURCHE Cole Canyon 5910 .0 .0 * 12.7 14.6 87 ----- ----- Basin Index (%) * 87 CHEYENNE RIVER BASIN Blind Park 6890 .0 .0 * 13.6 16.4 83 North Rapid Creek 6130 .0 .0 * 11.5 14.3 80 ----- ----- Basin Index (%) * 82 UPPER N. PLATTE Arapaho Ridge 10960 20.3 20.5 99 30.4 28.4 107 Blackhall Mtn 9820 27.9 -M * 42.1 -M * Columbine 9160 .0 6.4 0 32.3 30.4 106 Divide Peak 8880 .0 8.6 0 26.5 26.2 101 Joe Wright 10120 13.2 22.3 59 33.9 32.5 104 Laprele Creek 8375 .1 .0 * 15.7 16.6 95 Med Bow 10500 34.9 -M * 41.4 -M * North French Creek 10130 21.5 31.3 69 34.4 33.4 103 Never Summer 10280 20.9 21.7 96 23.3 -M * Old Battle 10000 35.2 33.9 104 43.5 41.8 104 Rawah 9020 .1 .9 11* 20.8 18.8 111 Sage Creek Basin 7850 -M .0 * 18.4 17.2 107 Sand Lake 10050 29.6 29.3 101 32.3 31.5 103 South Brush Creek 8440 .0 .5 0* 16.4 19.8 83 Tower 10500 37.0 49.0 76 51.9 47.5 109 Webber Springs 9250 11.5 14.8 78 37.5 31.8 118 Willow Creek Pass 9540 11.9 10.6 112 21.0 17.1 123 Zirkel 9340 11.0 14.3 77 47.3 33.3 142 ----- ----- Basin Index (%) 80 108 SWEETWATER Deer Park 9700 30.1 12.4 243 44.1 25.7 172 Larsen Creek 9000 .4 4.5 9 26.7 -M * South Pass 9040 27.1 9.2 295 34.0 22.2 153 ----- ----- Basin Index (%) 221 163 LOWER N. PLATTE Casper Mtn. 7900 .5 7.4 7 19.9 20.1 99 Laprele Creek 8375 .1 .0 * 15.7 16.6 95 Reno Hill 8400 .8 6.4 12 19.8 21.0 94 Windy Peak 7900 .0 .0 * 15.2 14.4 106 ----- ----- Basin Index (%) 10 98 LARAMIE RIVER Brooklyn Lake 10240 12.4 18.7 66 26.9 26.9 100 Cinnabar Park 9574 5.5 14.4 38 27.1 29.4 92 Crow Creek 8330 -M .0 * 12.4 15.0 83 Deadman Hill 10220 14.3 17.9 80 25.2 22.7 111 Rawah 9020 .1 .9 11* 20.8 18.8 111 Roach 9700 7.9 13.1 60 25.8 24.3 106 ----- ----- Basin Index (%) 62 101 S. PLATTE Black Mountain 8920 -M -M * 16.8 -M * Crow Creek 8330 -M .0 * 12.4 15.0 83 Deadman Hill 10220 14.3 17.9 80 25.2 22.7 111 ----- ----- Basin Index (%) 80* 100 LITTLE SNAKE RIVER Battle Mountain 7440 .0 .0 * 19.6 18.5 106 Divide Peak 8880 .0 8.6 0 26.5 26.2 101 Elk River 8700 .0 1.2 0* 23.3 24.4 95 Little Snake River 8915 11.9 16.5 72 43.8 35.0 125 Old Battle 10000 35.2 33.9 104 43.5 41.8 104 Sage Creek Basin 7850 -M .0 * 18.4 17.2 107 Sandstone RS 8150 .0 .0 * 19.4 22.3 87 Whiskey Park 8950 15.7 23.8 66 35.5 33.7 105 ----- ----- Basin Index (%) 75 105 UPPER GREEN RIVER Big Sandy Opening 9080 12.8 6.1 210 26.3 16.6 158 Blind Bull Sum 8650 -M 21.5 * 39.3 23.0 171 East Rim Divide 7930 .0 2.6 0 23.1 14.0 165 Elkhart Park G.S. 9400 12.2 7.5 163 26.9 16.5 163 Gros Ventre Summit 8750 -M 7.6 * -M 15.9 * Gunsight Pass 9820 19.6 11.7 168 28.7 17.5 164 Kendall R.S. 7740 .0 .0 * 31.4 16.6 189 Loomis Park 8240 13.4 4.8 279 35.3 20.4 173 New Fork Lake 8340 .0 .4 0* 21.3 13.4 159 Pocket Creek 9360 -M -M * -M -M * Snider Basin 8060 .0 2.9 0 29.4 16.6 177 Spring Creek Divide 9000 37.5 22.0 170 45.2 27.8 163 Triple Peak 8500 23.7 11.1 214 44.9 30.0 150 ----- ----- Basin Index (%) 173 166 LOWER GREEN RIVER Blacks Fork Jct 8869 .0 -M * 19.2 -M * Buck Pasture 9632 4.6 -M * 27.7 -M * EF Blacks Fork GS 9360 -M -M * 23.3 -M * Hams Fork 7840 .0 .0 * 24.0 14.2 169 Hewinta 9500 .0 .0 * 21.2 17.6 120 Hickerson Park 9122 .1 .0 * 15.0 13.3 113 Hole-in-Rock 9168 .0 .0 * 15.8 12.8 123 Indian Creek 9425 34.3 20.5 167 45.5 26.8 170 Kelley R.S. 8180 7.3 5.1 143 34.4 21.6 159 Spirit Lk 10235 3.1 -M * 21.1 -M * Steel Creek Park 10158 15.5 15.8 98 25.6 20.8 123 ----- ----- Basin Index (%) 138* 143 UPPER BEAR RIVER Bear River RS 8777 .0 -M * 21.5 -M * Bug Lake 7987 19.6 8.4 233 38.1 23.2 164 Burts Miller Ranch 8000 .0 -M * 11.9 -M * Chalk Creek #1 9171 23.1 18.0 128 41.4 30.6 135 Hayden Fork 9130 .2 1.1 18* 32.6 25.6 127 Kelley R.S. 8180 7.3 5.1 143 34.4 21.6 159 Lily Lake 9133 .0 .0 * 23.1 21.2 109 Monte Cristo 8932 26.9 17.5 154 45.0 31.4 143 Salt River Summit 7760 3.0 .6 500* 32.0 19.7 162 ----- ----- Basin Index (%) 158* 142 ----------------------------------------------------------------------------- -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.