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 MONDAY: MAY 15 , 2017 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7030 9.0 1.2 750* 42.3 24.0 176 Black Bear 8170 45.3 36.0 126 60.1 43.8 137 Blind Bull Sum 8650 -M 22.0 * 39.2 22.8 172 Cottonwood Creek 7670 19.3 10.3 187 44.1 29.5 149 East Rim Divide 7930 .1 3.9 3 23.1 13.9 166 Grand Targhee 9260 54.7 45.1 121 51.8 36.6 142 Granite Creek 6770 11.2 1.2 933* 38.4 22.5 171 Grassy Lake 7265 26.4 22.2 119 61.6 41.1 150 Gros Ventre Summit 8750 -M 8.6 * -M 15.7 * Gunsight Pass 9820 20.2 12.2 166 28.7 17.4 165 Lewis Lake Divide 7850 37.5 26.2 143 59.8 40.3 148 Phillips Bench 8200 32.7 21.9 149 50.8 32.4 157 Salt River Summit 7760 4.6 1.5 307 32.0 19.5 164 Snake River Station 6920 .0 .0 * 39.2 26.0 151 Spring Creek Divide 9000 38.6 22.6 171 44.9 27.7 162 Thumb Divide 7980 6.3 5.1 124 30.6 22.3 137 Togwotee Pass 9580 32.1 24.5 131 43.4 29.1 149 Two Ocean Plateau 9240 -M 29.2 * -M 32.2 * Willow Creek 8380 -M 19.5 * 57.7 40.1 144 Younts Peak 8350 5.8 13.8 42 33.6 19.0 177 ----- ----- Basin Index (%) 139 154 MADISON-GALLATIN Black Bear 8170 45.3 36.0 126 60.1 43.8 137 Canyon 7870 9.3 5.3 175 28.9 19.4 149 Madison Plateau 7750 19.4 17.2 113 40.2 30.6 131 West Yellowstone 6700 .0 .0 * 26.0 17.1 152 Whiskey Creek 6800 5.1 8.6 59 30.0 23.6 127 ----- ----- Basin Index (%) 118 138 YELLOWSTONE Beartooth Lake 9360 32.2 22.6 142 31.9 23.7 135 Burnt Mtn 5880 .0 .0 * 18.7 18.8 99 Canyon 7870 9.3 5.3 175 28.9 19.4 149 Cole Creek 7850 12.1 17.1 71 14.4 18.9 76 Evening Star 9200 34.6 25.3 137 49.6 32.6 152 Fisher Creek 9100 49.9 34.1 146 52.9 37.5 141 Northeast Entrance 7350 .0 .0 * 23.2 15.1 154 Parker Peak 9400 35.5 21.6 164 40.1 21.8 184 Sylvan Lake 8420 17.4 17.0 102 42.2 26.9 157 Thumb Divide 7980 6.3 5.1 124 30.6 22.3 137 Two Ocean Plateau 9240 -M 29.2 * -M 32.2 * White Mill 8700 34.1 24.4 140 40.0 28.3 141 Wolverine 7650 -M .0 * 23.7 15.1 157 ----- ----- Basin Index (%) 134 141 WIND RIVER Burroughs Creek 8750 9.9 -M * 29.3 -M * Castle Creek 8400 .0 -M * 17.9 -M * Cold Springs 9630 6.2 .2 3100* 22.5 14.0 161 Deer Park 9700 30.4 13.5 225 43.6 25.5 171 Hobbs Park 10100 30.3 15.0 202 34.8 18.6 187 Kirwin 9550 19.2 10.4 185 29.3 15.4 190 Little Warm 9370 12.3 6.1 202 27.6 16.9 163 Owl Creek 8975 .0 .0 * 15.6 9.2 170 South Pass 9040 27.3 10.1 270 33.9 22.1 153 St. Lawrence Alt 8620 .0 .1 0* 20.8 13.1 159 Togwotee Pass 9580 32.1 24.5 131 43.4 29.1 149 Townsend Creek 8700 12.4 1.2 1033 28.5 16.6 172 ----- ----- Basin Index (%) 210 166 BIGHORN BASIN Bald Mtn. 9380 20.2 20.7 98 21.6 21.7 100 Bear Trap Meadow 8200 .0 .0 * 15.0 12.2 123 Bone Springs Div 9350 18.6 15.9 117 22.5 20.3 111 Grave Springs 8550 4.8 6.4 75 13.7 14.7 93 Kirwin 9550 19.2 10.4 185 29.3 15.4 190 Marquette 8760 13.9 -M * 23.8 -M * Middle Powder 7760 5.1 8.9 57 15.0 15.9 94 Owl Creek 8975 .0 .0 * 15.6 9.2 170 Powder River Pass 9480 4.0 8.3 48 18.2 16.8 108 Shell Creek 9580 14.5 16.6 87 18.8 18.1 104 Timber Creek 7950 .0 .0 * 15.1 11.7 129 ----- ----- Basin Index (%) 99 118 SHOSHONE RIVER Blackwater 9780 39.0 24.8 157 46.7 25.3 185 Evening Star 9200 34.6 25.3 137 49.6 32.6 152 Marquette 8760 13.9 -M * 23.8 -M * Sylvan Road 7120 .0 .0 * 32.5 19.8 164 Younts Peak 8350 5.8 13.8 42 33.6 19.0 177 ----- ----- Basin Index (%) 124 168 POWDER RIVER Bear Trap Meadow 8200 .0 .0 * 15.0 12.2 123 Cloud Peak Reservoir 9860 17.5 16.3 107 26.6 19.0 140 Grave Springs 8550 4.8 6.4 75 13.7 14.7 93 Hansen Sawmill 8360 7.7 .0 * 18.7 12.5 150 Middle Powder 7760 5.1 8.9 57 15.0 15.9 94 Powder River Pass 9480 4.0 8.3 48 18.2 16.8 108 Soldier Park 8720 8.8 -M * 20.7 -M * ----- ----- Basin Index (%) 98 118 TONGUE RIVER Big Goose 7990 8.9 8.8 101 20.2 16.6 122 Bone Springs Div 9350 18.6 15.9 117 22.5 20.3 111 Burgess Junction 7880 7.5 10.6 71 16.3 16.6 98 Dome Lake 8880 13.9 9.7 143 22.5 18.5 122 Little Goose 8870 11.8 -M * 24.4 -M * Sucker Creek 8880 10.3 11.3 91 19.3 19.7 98 Tie Creek 6870 .1 .2 50* 20.1 16.8 120 ----- ----- Basin Index (%) 105 111 BELLE FOURCHE Cole Canyon 5910 .0 .0 * 12.4 14.4 86 ----- ----- Basin Index (%) * 86 CHEYENNE RIVER BASIN Blind Park 6890 .1 .0 * 12.9 16.2 80 North Rapid Creek 6130 .0 .0 * 11.0 14.2 77 ----- ----- Basin Index (%) * 79 UPPER N. PLATTE Arapaho Ridge 10960 21.4 21.6 99 30.4 28.2 108 Blackhall Mtn 9820 29.7 -M * 42.0 -M * Columbine 9160 .0 8.5 0 32.4 30.2 107 Divide Peak 8880 .1 10.5 1 26.6 26.0 102 Joe Wright 10120 14.2 22.8 62 33.9 32.2 105 Laprele Creek 8375 .3 .0 * 15.9 16.4 97 Med Bow 10500 36.4 -M * 41.3 -M * North French Creek 10130 22.9 32.1 71 34.3 33.0 104 Never Summer 10280 21.9 22.1 99 23.2 -M * Old Battle 10000 35.7 35.1 102 43.6 41.5 105 Rawah 9020 .1 1.4 7 20.8 18.8 111 Sage Creek Basin 7850 -M .0 * 18.2 17.2 106 Sand Lake 10050 31.1 30.5 102 32.3 31.2 104 South Brush Creek 8440 .0 1.5 0 16.8 19.6 86 Tower 10500 38.6 49.9 77 52.0 47.2 110 Webber Springs 9250 13.5 16.4 82 37.5 31.7 118 Willow Creek Pass 9540 13.3 11.4 117 21.0 17.0 124 Zirkel 9340 12.8 16.7 77 47.3 33.2 142 ----- ----- Basin Index (%) 81 109 SWEETWATER Deer Park 9700 30.4 13.5 225 43.6 25.5 171 Larsen Creek 9000 .3 5.0 6 26.2 -M * South Pass 9040 27.3 10.1 270 33.9 22.1 153 ----- ----- Basin Index (%) 203 163 LOWER N. PLATTE Casper Mtn. 7900 1.9 9.1 21 19.8 19.9 99 Laprele Creek 8375 .3 .0 * 15.9 16.4 97 Reno Hill 8400 1.9 7.8 24 20.1 20.8 97 Windy Peak 7900 .0 .0 * 15.4 14.2 108 ----- ----- Basin Index (%) 24 100 LARAMIE RIVER Brooklyn Lake 10240 14.2 19.7 72 27.0 26.6 102 Cinnabar Park 9574 7.3 15.3 48 27.0 29.2 92 Crow Creek 8330 .0 .0 * 12.5 14.9 84 Deadman Hill 10220 16.2 18.3 89 25.2 22.4 112 Rawah 9020 .1 1.4 7 20.8 18.8 111 Roach 9700 9.6 13.9 69 25.8 24.0 108 ----- ----- Basin Index (%) 69 102 S. PLATTE Black Mountain 8920 -M -M * 16.9 -M * Crow Creek 8330 .0 .0 * 12.5 14.9 84 Deadman Hill 10220 16.2 18.3 89 25.2 22.4 112 ----- ----- Basin Index (%) 89* 101 LITTLE SNAKE RIVER Battle Mountain 7440 .0 .0 * 19.6 18.4 107 Divide Peak 8880 .1 10.5 1 26.6 26.0 102 Elk River 8700 .1 3.3 3 23.2 24.2 96 Little Snake River 8915 13.5 18.0 75 43.7 34.9 125 Old Battle 10000 35.7 35.1 102 43.6 41.5 105 Sage Creek Basin 7850 -M .0 * 18.2 17.2 106 Sandstone RS 8150 .0 .0 * 19.5 22.2 88 Whiskey Park 8950 17.9 24.6 73 35.4 33.5 106 ----- ----- Basin Index (%) 74 105 UPPER GREEN RIVER Big Sandy Opening 9080 13.1 7.6 172 25.9 16.5 157 Blind Bull Sum 8650 -M 22.0 * 39.2 22.8 172 East Rim Divide 7930 .1 3.9 3 23.1 13.9 166 Elkhart Park G.S. 9400 12.7 8.5 149 27.0 16.4 165 Gros Ventre Summit 8750 -M 8.6 * -M 15.7 * Gunsight Pass 9820 20.2 12.2 166 28.7 17.4 165 Kendall R.S. 7740 .2 .0 * 31.3 16.5 190 Loomis Park 8240 14.5 5.9 246 35.2 20.2 174 New Fork Lake 8340 .6 1.1 55 21.0 13.2 159 Pocket Creek 9360 -M -M * -M -M * Snider Basin 8060 .0 4.8 0 29.3 16.6 177 Spring Creek Divide 9000 38.6 22.6 171 44.9 27.7 162 Triple Peak 8500 25.2 12.7 198 44.8 29.7 151 ----- ----- Basin Index (%) 158 166 LOWER GREEN RIVER Blacks Fork Jct 8869 .0 -M * 19.1 -M * Buck Pasture 9632 6.2 -M * 27.6 -M * EF Blacks Fork GS 9360 -M -M * 23.1 -M * Hams Fork 7840 .0 .0 * 24.0 14.2 169 Hewinta 9500 .0 .1 0* 21.1 17.5 121 Hickerson Park 9122 .0 .0 * 14.9 13.2 113 Hole-in-Rock 9168 .0 .0 * 15.8 12.7 124 Indian Creek 9425 34.8 21.2 164 45.2 26.6 170 Kelley R.S. 8180 8.4 6.4 131 34.0 21.5 158 Spirit Lk 10235 4.8 -M * 21.0 -M * Steel Creek Park 10158 16.2 16.5 98 25.5 20.7 123 ----- ----- Basin Index (%) 134* 143 UPPER BEAR RIVER Bear River RS 8777 .0 -M * 21.5 -M * Bug Lake 7987 21.1 10.2 207 37.6 23.1 163 Burts Miller Ranch 8000 .0 -M * 11.9 -M * Chalk Creek #1 9171 24.8 19.4 128 41.1 30.4 135 Hayden Fork 9130 .4 3.1 13 32.5 25.5 127 Kelley R.S. 8180 8.4 6.4 131 34.0 21.5 158 Lily Lake 9133 .0 1.2 0* 23.0 21.0 110 Monte Cristo 8932 28.3 19.0 149 44.7 31.2 143 Salt River Summit 7760 4.6 1.5 307 32.0 19.5 164 ----- ----- Basin Index (%) 144 142 ----------------------------------------------------------------------------- -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.