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 11 , 2017 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7030 12.5 3.9 321 42.3 23.7 178 Black Bear 8170 47.7 36.8 130 59.8 43.2 138 Blind Bull Sum 8650 -M 22.4 * 39.2 22.3 176 Cottonwood Creek 7670 22.8 12.5 182 44.1 29.0 152 East Rim Divide 7930 .1 5.7 2 23.1 13.6 170 Grand Targhee 9260 57.2 46.3 124 51.7 36.1 143 Granite Creek 6770 15.4 4.7 328 38.4 22.2 173 Grassy Lake 7265 30.4 25.3 120 61.5 40.7 151 Gros Ventre Summit 8750 16.9 9.5 178 26.7 15.5 172 Gunsight Pass 9820 22.9 12.2 188 28.6 17.1 167 Lewis Lake Divide 7850 41.0 29.0 141 59.7 39.9 150 Phillips Bench 8200 36.0 23.0 157 50.8 32.0 159 Salt River Summit 7760 8.8 3.9 226 32.1 19.2 167 Snake River Station 6920 3.6 1.8 200 39.2 25.7 153 Spring Creek Divide 9000 42.3 23.5 180 44.9 27.2 165 Thumb Divide 7980 11.0 7.9 139 30.5 21.9 139 Togwotee Pass 9580 34.6 25.4 136 43.3 28.7 151 Two Ocean Plateau 9240 -M 29.5 * -M 31.7 * Willow Creek 8380 -M 20.8 * 57.7 39.4 146 Younts Peak 8350 11.9 15.3 78 33.6 18.7 180 ----- ----- Basin Index (%) 145 156 MADISON-GALLATIN Black Bear 8170 47.7 36.8 130 59.8 43.2 138 Canyon 7870 12.6 7.1 177 28.9 19.0 152 Madison Plateau 7750 22.7 19.6 116 40.1 30.1 133 West Yellowstone 6700 .0 .0 * 26.0 16.7 156 Whiskey Creek 6800 7.5 10.3 73 29.9 23.2 129 ----- ----- Basin Index (%) 123 140 YELLOWSTONE Beartooth Lake 9360 34.0 23.0 148 31.8 23.2 137 Burnt Mtn 5880 .0 .0 * 18.6 17.8 104 Canyon 7870 12.6 7.1 177 28.9 19.0 152 Cole Creek 7850 14.1 17.2 82 14.3 18.3 78 Evening Star 9200 35.7 25.5 140 49.5 32.0 155 Fisher Creek 9100 48.4 34.4 141 52.8 36.8 143 Northeast Entrance 7350 .0 .8 0* 23.2 14.7 158 Parker Peak 9400 38.7 22.1 175 40.1 21.3 188 Sylvan Lake 8420 24.4 18.0 136 42.1 26.5 159 Thumb Divide 7980 11.0 7.9 139 30.5 21.9 139 Two Ocean Plateau 9240 -M 29.5 * -M 31.7 * White Mill 8700 37.2 24.8 150 40.1 27.7 145 Wolverine 7650 -M .0 * 23.6 14.7 161 ----- ----- Basin Index (%) 142 144 WIND RIVER Burroughs Creek 8750 13.4 -M * 29.3 -M * Castle Creek 8400 .0 -M * 17.7 -M * Cold Springs 9630 10.2 1.2 850 22.4 13.5 166 Deer Park 9700 33.6 14.4 233 43.5 24.9 175 Hobbs Park 10100 32.8 15.8 208 34.7 18.0 193 Kirwin 9550 21.6 10.9 198 29.3 15.0 195 Little Warm 9370 15.1 6.6 229 27.5 16.4 168 Owl Creek 8975 1.2 .5 240* 15.6 8.8 177 South Pass 9040 30.3 11.4 266 33.9 21.5 158 St. Lawrence Alt 8620 2.3 .8 288 20.8 12.6 165 Togwotee Pass 9580 34.6 25.4 136 43.3 28.7 151 Townsend Creek 8700 15.8 3.4 465 28.3 16.0 177 ----- ----- Basin Index (%) 218 171 BIGHORN BASIN Bald Mtn. 9380 22.3 20.7 108 21.6 21.2 102 Bear Trap Meadow 8200 .6 .0 * 14.9 11.8 126 Bone Springs Div 9350 20.7 16.6 125 22.1 19.9 111 Grave Springs 8550 8.1 7.5 108 13.6 14.4 94 Kirwin 9550 21.6 10.9 198 29.3 15.0 195 Marquette 8760 16.7 -M * 23.9 -M * Middle Powder 7760 8.9 10.5 85 14.4 15.5 93 Owl Creek 8975 1.2 .5 240* 15.6 8.8 177 Powder River Pass 9480 7.5 9.0 83 18.2 16.4 111 Shell Creek 9580 17.4 16.8 104 18.7 17.7 106 Timber Creek 7950 1.4 1.3 108 15.1 11.2 135 ----- ----- Basin Index (%) 117 121 SHOSHONE RIVER Blackwater 9780 40.5 24.6 165 46.7 24.7 189 Evening Star 9200 35.7 25.5 140 49.5 32.0 155 Marquette 8760 16.7 -M * 23.9 -M * Sylvan Road 7120 .0 1.2 0 32.4 19.4 167 Younts Peak 8350 11.9 15.3 78 33.6 18.7 180 ----- ----- Basin Index (%) 132 171 POWDER RIVER Bear Trap Meadow 8200 .6 .0 * 14.9 11.8 126 Cloud Peak Reservoir 9860 19.4 16.8 115 26.5 18.4 144 Grave Springs 8550 8.1 7.5 108 13.6 14.4 94 Hansen Sawmill 8360 11.4 1.0 1140 18.8 12.0 157 Middle Powder 7760 8.9 10.5 85 14.4 15.5 93 Powder River Pass 9480 7.5 9.0 83 18.2 16.4 111 Soldier Park 8720 13.6 -M * 20.7 -M * ----- ----- Basin Index (%) 125 120 TONGUE RIVER Big Goose 7990 12.0 10.3 117 20.2 16.0 126 Bone Springs Div 9350 20.7 16.6 125 22.1 19.9 111 Burgess Junction 7880 10.5 11.4 92 16.0 16.2 99 Dome Lake 8880 16.6 11.1 150 22.0 18.1 122 Little Goose 8870 15.3 -M * 24.2 -M * Sucker Creek 8880 13.1 12.7 103 19.2 19.2 100 Tie Creek 6870 .1 1.2 8 20.0 16.2 123 ----- ----- Basin Index (%) 115 113 BELLE FOURCHE Cole Canyon 5910 .0 .0 * 12.1 13.8 88 ----- ----- Basin Index (%) * 88 CHEYENNE RIVER BASIN Blind Park 6890 .0 .0 * 12.3 15.7 78 North Rapid Creek 6130 .0 .0 * 10.2 13.8 74 ----- ----- Basin Index (%) * 76 UPPER N. PLATTE Arapaho Ridge 10960 24.3 22.3 109 30.5 27.6 111 Blackhall Mtn 9820 34.2 -M * 42.2 -M * Columbine 9160 6.3 11.9 53 32.5 29.7 109 Divide Peak 8880 5.1 13.7 37 26.2 25.6 102 Joe Wright 10120 17.2 23.2 74 34.0 31.5 108 Laprele Creek 8375 .2 2.0 10 15.7 16.2 97 Med Bow 10500 37.1 -M * 41.3 -M * North French Creek 10130 25.4 32.7 78 34.2 32.5 105 Never Summer 10280 23.8 22.2 107 23.1 -M * Old Battle 10000 37.7 36.9 102 43.3 40.9 106 Rawah 9020 .3 2.4 12 20.8 18.3 114 Sage Creek Basin 7850 -M .0 * 18.4 16.9 109 Sand Lake 10050 32.2 31.7 102 32.3 30.7 105 South Brush Creek 8440 .4 4.4 9 16.3 19.1 85 Tower 10500 42.9 51.2 84 51.7 46.6 111 Webber Springs 9250 17.9 19.0 94 37.5 31.2 120 Willow Creek Pass 9540 16.3 13.0 125 21.0 16.5 127 Zirkel 9340 18.1 19.3 94 47.4 32.8 145 ----- ----- Basin Index (%) 88 111 SWEETWATER Deer Park 9700 33.6 14.4 233 43.5 24.9 175 Larsen Creek 9000 4.3 6.2 69 26.2 -M * South Pass 9040 30.3 11.4 266 33.9 21.5 158 ----- ----- Basin Index (%) 213 167 LOWER N. PLATTE Casper Mtn. 7900 6.8 11.1 61 19.4 19.6 99 Laprele Creek 8375 .2 2.0 10 15.7 16.2 97 Reno Hill 8400 6.9 10.0 69 19.7 20.4 97 Windy Peak 7900 .0 .0 * 15.2 13.9 109 ----- ----- Basin Index (%) 60 100 LARAMIE RIVER Brooklyn Lake 10240 17.7 21.1 84 26.9 26.1 103 Cinnabar Park 9574 10.8 17.0 64 27.0 28.4 95 Crow Creek 8330 .0 .0 * 12.5 14.4 87 Deadman Hill 10220 19.6 18.5 106 25.3 21.8 116 Rawah 9020 .3 2.4 12 20.8 18.3 114 Roach 9700 13.5 15.5 87 25.8 23.4 110 ----- ----- Basin Index (%) 83 104 S. PLATTE Black Mountain 8920 1.6 -M * 16.8 -M * Crow Creek 8330 .0 .0 * 12.5 14.4 87 Deadman Hill 10220 19.6 18.5 106 25.3 21.8 116 ----- ----- Basin Index (%) 106* 104 LITTLE SNAKE RIVER Battle Mountain 7440 .0 .0 * 19.6 18.0 109 Divide Peak 8880 5.1 13.7 37 26.2 25.6 102 Elk River 8700 .1 7.0 1 23.3 23.8 98 Little Snake River 8915 18.5 20.1 92 43.7 34.4 127 Old Battle 10000 37.7 36.9 102 43.3 40.9 106 Sage Creek Basin 7850 -M .0 * 18.4 16.9 109 Sandstone RS 8150 -M 1.3 * 19.4 21.9 89 Whiskey Park 8950 23.1 26.5 87 35.4 33.0 107 ----- ----- Basin Index (%) 81 107 UPPER GREEN RIVER Big Sandy Opening 9080 16.8 8.6 195 25.8 16.2 159 Blind Bull Sum 8650 -M 22.4 * 39.2 22.3 176 East Rim Divide 7930 .1 5.7 2 23.1 13.6 170 Elkhart Park G.S. 9400 16.0 9.5 168 26.8 16.0 168 Gros Ventre Summit 8750 16.9 9.5 178 26.7 15.5 172 Gunsight Pass 9820 22.9 12.2 188 28.6 17.1 167 Kendall R.S. 7740 6.1 .0 * 31.3 16.2 193 Loomis Park 8240 17.6 7.0 251 35.2 19.9 177 New Fork Lake 8340 4.8 2.4 200 20.4 12.9 158 Pocket Creek 9360 -M -M * -M -M * Snider Basin 8060 4.2 7.2 58 29.2 16.3 179 Spring Creek Divide 9000 42.3 23.5 180 44.9 27.2 165 Triple Peak 8500 29.3 14.5 202 44.9 29.2 154 ----- ----- Basin Index (%) 177 169 LOWER GREEN RIVER Blacks Fork Jct 8869 .0 -M * 19.1 -M * Buck Pasture 9632 10.8 -M * 27.6 -M * EF Blacks Fork GS 9360 5.1 -M * 22.8 -M * Hams Fork 7840 .0 .2 0* 23.9 13.9 172 Hewinta 9500 .0 1.5 0 21.1 17.2 123 Hickerson Park 9122 .1 .0 * 14.9 12.9 116 Hole-in-Rock 9168 .0 .0 * 15.7 12.4 127 Indian Creek 9425 38.1 21.1 181 45.2 26.2 173 Kelley R.S. 8180 12.8 8.1 158 33.9 21.2 160 Spirit Lk 10235 9.6 -M * 21.0 -M * Steel Creek Park 10158 18.8 17.6 107 25.5 20.3 126 ----- ----- Basin Index (%) 144* 145 UPPER BEAR RIVER Bear River RS 8777 .0 -M * 21.5 -M * Bug Lake 7987 25.0 12.0 208 37.6 22.7 166 Burts Miller Ranch 8000 .0 -M * 11.9 -M * Chalk Creek #1 9171 29.8 21.2 141 41.1 29.9 137 Hayden Fork 9130 4.5 5.4 83 32.8 25.0 131 Kelley R.S. 8180 12.8 8.1 158 33.9 21.2 160 Lily Lake 9133 4.8 4.5 107 23.0 20.7 111 Monte Cristo 8932 32.9 21.0 157 44.7 30.8 145 Salt River Summit 7760 8.8 3.9 226 32.1 19.2 167 ----- ----- Basin Index (%) 156 145 ----------------------------------------------------------------------------- -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.