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 TUESDAY: MAY 16 , 2017 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7030 8.4 .0 * 42.3 24.1 176 Black Bear 8170 44.9 35.8 125 60.1 44.1 136 Blind Bull Sum 8650 -M 21.8 * 39.2 22.9 171 Cottonwood Creek 7670 18.4 9.6 192 44.1 29.5 149 East Rim Divide 7930 .0 3.3 0 23.1 13.9 166 Grand Targhee 9260 54.7 44.6 123 51.8 36.7 141 Granite Creek 6770 10.0 .4 2500* 38.4 22.6 170 Grassy Lake 7265 25.8 21.3 121 61.5 41.3 149 Gros Ventre Summit 8750 -M 8.2 * -M 15.8 * Gunsight Pass 9820 19.9 12.0 166 28.7 17.5 164 Lewis Lake Divide 7850 36.9 25.3 146 59.8 40.5 148 Phillips Bench 8200 31.9 21.5 148 50.8 32.5 156 Salt River Summit 7760 3.6 1.0 360* 31.9 19.6 163 Snake River Station 6920 .0 .0 * 39.2 26.1 150 Spring Creek Divide 9000 38.2 22.3 171 44.9 27.8 162 Thumb Divide 7980 5.1 4.3 119 30.6 22.4 137 Togwotee Pass 9580 31.9 24.1 132 43.3 29.2 148 Two Ocean Plateau 9240 -M 29.1 * -M 32.3 * Willow Creek 8380 -M 19.3 * 57.7 40.3 143 Younts Peak 8350 3.2 13.3 24 33.5 19.2 174 ----- ----- Basin Index (%) 139 153 MADISON-GALLATIN Black Bear 8170 44.9 35.8 125 60.1 44.1 136 Canyon 7870 8.7 4.8 181 28.9 19.5 148 Madison Plateau 7750 19.2 16.5 116 40.2 30.9 130 West Yellowstone 6700 .0 .0 * 26.0 17.2 151 Whiskey Creek 6800 4.7 8.1 58 30.0 23.8 126 ----- ----- Basin Index (%) 119 137 YELLOWSTONE Beartooth Lake 9360 32.5 22.5 144 31.9 23.8 134 Burnt Mtn 5880 .0 .0 * 18.7 18.8 99 Canyon 7870 8.7 4.8 181 28.9 19.5 148 Cole Creek 7850 11.8 16.9 70 14.4 19.0 76 Evening Star 9200 34.7 25.1 138 49.6 32.7 152 Fisher Creek 9100 -M 33.9 * 52.9 37.7 140 Northeast Entrance 7350 .0 .0 * 23.2 15.1 154 Parker Peak 9400 34.7 21.3 163 40.1 22.0 182 Sylvan Lake 8420 16.6 16.7 99 42.1 27.1 155 Thumb Divide 7980 5.1 4.3 119 30.6 22.4 137 Two Ocean Plateau 9240 -M 29.1 * -M 32.3 * White Mill 8700 33.5 24.1 139 40.0 28.4 141 Wolverine 7650 -M .0 * 23.6 15.2 155 ----- ----- Basin Index (%) 131 141 WIND RIVER Burroughs Creek 8750 8.7 -M * 29.3 -M * Castle Creek 8400 .0 -M * 17.9 -M * Cold Springs 9630 5.1 .0 * 22.5 14.1 160 Deer Park 9700 29.8 13.0 229 43.5 25.6 170 Hobbs Park 10100 29.7 14.6 203 34.8 18.7 186 Kirwin 9550 18.9 10.1 187 29.3 15.5 189 Little Warm 9370 11.9 5.6 212 27.6 17.0 162 Owl Creek 8975 .0 .0 * 15.6 9.3 168 South Pass 9040 26.5 9.7 273 33.9 22.2 153 St. Lawrence Alt 8620 .0 .0 * 20.8 13.2 158 Togwotee Pass 9580 31.9 24.1 132 43.3 29.2 148 Townsend Creek 8700 11.5 .6 1917* 28.5 16.7 171 ----- ----- Basin Index (%) 213 165 BIGHORN BASIN Bald Mtn. 9380 19.9 20.5 97 21.6 21.7 100 Bear Trap Meadow 8200 .0 .0 * 15.1 12.2 124 Bone Springs Div 9350 18.1 15.6 116 22.5 20.4 110 Grave Springs 8550 4.1 5.9 69 13.8 14.8 93 Kirwin 9550 18.9 10.1 187 29.3 15.5 189 Marquette 8760 13.6 -M * 23.8 -M * Middle Powder 7760 4.2 8.3 51 15.2 15.9 96 Owl Creek 8975 .0 .0 * 15.6 9.3 168 Powder River Pass 9480 3.2 8.0 40 18.2 16.8 108 Shell Creek 9580 14.0 16.4 85 18.9 18.2 104 Timber Creek 7950 .0 .0 * 15.2 11.8 129 ----- ----- Basin Index (%) 97 118 SHOSHONE RIVER Blackwater 9780 38.9 24.9 156 46.7 25.4 184 Evening Star 9200 34.7 25.1 138 49.6 32.7 152 Marquette 8760 13.6 -M * 23.8 -M * Sylvan Road 7120 .0 .0 * 32.4 19.9 163 Younts Peak 8350 3.2 13.3 24 33.5 19.2 174 ----- ----- Basin Index (%) 121 167 POWDER RIVER Bear Trap Meadow 8200 .0 .0 * 15.1 12.2 124 Cloud Peak Reservoir 9860 16.9 16.1 105 26.6 19.1 139 Grave Springs 8550 4.1 5.9 69 13.8 14.8 93 Hansen Sawmill 8360 6.6 .0 * 18.7 12.5 150 Middle Powder 7760 4.2 8.3 51 15.2 15.9 96 Powder River Pass 9480 3.2 8.0 40 18.2 16.8 108 Soldier Park 8720 7.6 -M * 20.8 -M * ----- ----- Basin Index (%) 91 118 TONGUE RIVER Big Goose 7990 8.1 8.2 99 20.3 16.7 122 Bone Springs Div 9350 18.1 15.6 116 22.5 20.4 110 Burgess Junction 7880 6.7 10.2 66 16.3 16.6 98 Dome Lake 8880 13.4 9.2 146 22.7 18.6 122 Little Goose 8870 10.9 -M * 24.4 -M * Sucker Creek 8880 9.7 10.8 90 19.2 19.8 97 Tie Creek 6870 .1 .0 * 20.2 16.9 120 ----- ----- Basin Index (%) 104 111 BELLE FOURCHE Cole Canyon 5910 .0 .0 * 12.5 14.5 86 ----- ----- Basin Index (%) * 86 CHEYENNE RIVER BASIN Blind Park 6890 .0 .0 * 13.2 16.3 81 North Rapid Creek 6130 .0 .0 * 11.3 14.2 80 ----- ----- Basin Index (%) * 80 UPPER N. PLATTE Arapaho Ridge 10960 20.5 21.1 97 30.4 28.4 107 Blackhall Mtn 9820 28.5 -M * 42.0 -M * Columbine 9160 .0 7.5 0 32.4 30.3 107 Divide Peak 8880 .0 9.6 0 26.6 26.1 102 Joe Wright 10120 13.5 22.6 60 33.9 32.3 105 Laprele Creek 8375 .3 .0 * 16.0 16.5 97 Med Bow 10500 35.7 -M * 41.3 -M * North French Creek 10130 21.7 31.8 68 34.3 33.2 103 Never Summer 10280 21.1 22.0 96 23.2 -M * Old Battle 10000 35.3 34.5 102 43.6 41.6 105 Rawah 9020 .1 1.2 8 20.8 18.8 111 Sage Creek Basin 7850 -M .0 * 18.3 17.2 106 Sand Lake 10050 30.2 29.9 101 32.2 31.4 103 South Brush Creek 8440 .0 1.0 0* 17.0 19.7 86 Tower 10500 37.8 49.5 76 52.0 47.3 110 Webber Springs 9250 11.9 15.6 76 37.5 31.8 118 Willow Creek Pass 9540 12.4 11.0 113 21.0 17.1 123 Zirkel 9340 11.4 15.6 73 47.4 33.3 142 ----- ----- Basin Index (%) 79 109 SWEETWATER Deer Park 9700 29.8 13.0 229 43.5 25.6 170 Larsen Creek 9000 .3 4.7 6 26.2 -M * South Pass 9040 26.5 9.7 273 33.9 22.2 153 ----- ----- Basin Index (%) 207 162 LOWER N. PLATTE Casper Mtn. 7900 .8 8.3 10 20.0 20.0 100 Laprele Creek 8375 .3 .0 * 16.0 16.5 97 Reno Hill 8400 1.2 7.2 17 20.2 21.0 96 Windy Peak 7900 .0 .0 * 15.4 14.3 108 ----- ----- Basin Index (%) 15 100 LARAMIE RIVER Brooklyn Lake 10240 13.3 19.2 69 27.0 26.7 101 Cinnabar Park 9574 6.3 14.8 43 27.0 29.3 92 Crow Creek 8330 .0 .0 * 12.5 15.0 83 Deadman Hill 10220 15.0 18.2 82 25.3 22.5 112 Rawah 9020 .1 1.2 8 20.8 18.8 111 Roach 9700 8.6 13.5 64 25.8 24.1 107 ----- ----- Basin Index (%) 65 101 S. PLATTE Black Mountain 8920 -M -M * 16.8 -M * Crow Creek 8330 .0 .0 * 12.5 15.0 83 Deadman Hill 10220 15.0 18.2 82 25.3 22.5 112 ----- ----- Basin Index (%) 82* 101 LITTLE SNAKE RIVER Battle Mountain 7440 .0 .0 * 19.7 18.4 107 Divide Peak 8880 .0 9.6 0 26.6 26.1 102 Elk River 8700 .1 2.2 5 23.2 24.3 95 Little Snake River 8915 12.0 17.3 69 43.8 35.0 125 Old Battle 10000 35.3 34.5 102 43.6 41.6 105 Sage Creek Basin 7850 -M .0 * 18.3 17.2 106 Sandstone RS 8150 .0 .0 * 19.6 22.3 88 Whiskey Park 8950 15.4 24.2 64 35.4 33.6 105 ----- ----- Basin Index (%) 72 105 UPPER GREEN RIVER Big Sandy Opening 9080 12.2 7.0 174 25.8 16.6 155 Blind Bull Sum 8650 -M 21.8 * 39.2 22.9 171 East Rim Divide 7930 .0 3.3 0 23.1 13.9 166 Elkhart Park G.S. 9400 12.3 8.0 154 26.9 16.5 163 Gros Ventre Summit 8750 -M 8.2 * -M 15.8 * Gunsight Pass 9820 19.9 12.0 166 28.7 17.5 164 Kendall R.S. 7740 .0 .0 * 31.3 16.5 190 Loomis Park 8240 13.9 5.4 257 35.2 20.3 173 New Fork Lake 8340 .0 .7 0* 21.2 13.3 159 Pocket Creek 9360 -M -M * -M -M * Snider Basin 8060 .0 3.9 0 29.3 16.6 177 Spring Creek Divide 9000 38.2 22.3 171 44.9 27.8 162 Triple Peak 8500 24.2 12.0 202 44.8 29.9 150 ----- ----- Basin Index (%) 162 165 LOWER GREEN RIVER Blacks Fork Jct 8869 .1 -M * 19.1 -M * Buck Pasture 9632 5.3 -M * 27.7 -M * EF Blacks Fork GS 9360 -M -M * 23.1 -M * Hams Fork 7840 .0 .0 * 24.0 14.2 169 Hewinta 9500 .0 .0 * 21.2 17.5 121 Hickerson Park 9122 .1 .0 * 15.0 13.2 114 Hole-in-Rock 9168 .0 .0 * 15.8 12.8 123 Indian Creek 9425 33.8 20.9 162 45.1 26.7 169 Kelley R.S. 8180 7.3 5.8 126 34.1 21.5 159 Spirit Lk 10235 3.6 -M * 21.0 -M * Steel Creek Park 10158 15.7 16.1 98 25.5 20.7 123 ----- ----- Basin Index (%) 133* 143 UPPER BEAR RIVER Bear River RS 8777 .0 -M * 21.5 -M * Bug Lake 7987 20.1 9.4 214 37.7 23.2 162 Burts Miller Ranch 8000 .0 -M * 11.9 -M * Chalk Creek #1 9171 23.5 18.7 126 41.2 30.5 135 Hayden Fork 9130 .1 2.1 5 32.5 25.5 127 Kelley R.S. 8180 7.3 5.8 126 34.1 21.5 159 Lily Lake 9133 .0 .7 0* 23.1 21.1 109 Monte Cristo 8932 27.2 18.4 148 44.8 31.3 143 Salt River Summit 7760 3.6 1.0 360* 31.9 19.6 163 ----- ----- Basin Index (%) 146 142 ----------------------------------------------------------------------------- -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.