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 SUNDAY: MAY 14 , 2017 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7030 10.0 2.0 500 42.3 24.0 176 Black Bear 8170 45.6 36.3 126 59.9 43.7 137 Blind Bull Sum 8650 -M 22.1 * 39.1 22.7 172 Cottonwood Creek 7670 19.9 10.9 183 44.0 29.4 150 East Rim Divide 7930 .0 4.5 0 23.0 13.8 167 Grand Targhee 9260 55.1 45.5 121 51.7 36.6 141 Granite Creek 6770 12.3 2.4 512 38.4 22.5 171 Grassy Lake 7265 26.7 23.1 116 61.5 41.1 150 Gros Ventre Summit 8750 14.8 9.0 164 26.7 15.7 170 Gunsight Pass 9820 20.8 12.4 168 28.6 17.4 164 Lewis Lake Divide 7850 38.0 27.1 140 59.8 40.2 149 Phillips Bench 8200 33.1 22.3 148 50.8 32.3 157 Salt River Summit 7760 5.6 2.1 267 31.8 19.4 164 Snake River Station 6920 .0 .0 * 39.1 25.9 151 Spring Creek Divide 9000 39.8 22.8 175 44.9 27.6 163 Thumb Divide 7980 6.9 5.9 117 30.5 22.2 137 Togwotee Pass 9580 32.4 24.8 131 43.3 29.1 149 Two Ocean Plateau 9240 -M 29.3 * -M 32.1 * Willow Creek 8380 -M 19.7 * 57.7 40.1 144 Younts Peak 8350 6.0 14.2 42 33.5 19.0 176 ----- ----- Basin Index (%) 138 154 MADISON-GALLATIN Black Bear 8170 45.6 36.3 126 59.9 43.7 137 Canyon 7870 9.9 5.8 171 28.9 19.3 150 Madison Plateau 7750 19.6 17.8 110 40.2 30.5 132 West Yellowstone 6700 .0 .0 * 26.0 17.0 153 Whiskey Creek 6800 5.6 9.1 62 29.9 23.5 127 ----- ----- Basin Index (%) 117 138 YELLOWSTONE Beartooth Lake 9360 32.3 22.7 142 31.8 23.6 135 Burnt Mtn 5880 .0 .0 * 18.7 18.7 100 Canyon 7870 9.9 5.8 171 28.9 19.3 150 Cole Creek 7850 12.6 17.2 73 14.1 18.9 75 Evening Star 9200 34.9 25.4 137 49.6 32.4 153 Fisher Creek 9100 48.8 34.3 142 53.0 37.3 142 Northeast Entrance 7350 .0 .2 0* 23.2 15.0 155 Parker Peak 9400 35.9 21.9 164 40.0 21.7 184 Sylvan Lake 8420 18.3 17.3 106 42.1 26.8 157 Thumb Divide 7980 6.9 5.9 117 30.5 22.2 137 Two Ocean Plateau 9240 -M 29.3 * -M 32.1 * White Mill 8700 34.6 24.6 141 40.0 28.1 142 Wolverine 7650 -M .0 * 23.4 15.0 156 ----- ----- Basin Index (%) 134 142 WIND RIVER Burroughs Creek 8750 10.1 -M * 29.2 -M * Castle Creek 8400 .0 -M * 17.7 -M * Cold Springs 9630 7.4 .5 1480* 22.3 14.0 159 Deer Park 9700 31.1 13.9 224 43.5 25.5 171 Hobbs Park 10100 30.5 15.3 199 34.8 18.6 187 Kirwin 9550 19.4 10.5 185 29.3 15.3 192 Little Warm 9370 13.0 6.4 203 27.5 16.8 164 Owl Creek 8975 .0 .0 * 15.6 9.1 171 South Pass 9040 27.5 10.5 262 33.9 22.0 154 St. Lawrence Alt 8620 .0 .2 0* 20.7 13.1 158 Togwotee Pass 9580 32.4 24.8 131 43.3 29.1 149 Townsend Creek 8700 13.0 1.8 722 28.4 16.5 172 ----- ----- Basin Index (%) 208 166 BIGHORN BASIN Bald Mtn. 9380 20.5 20.8 99 21.6 21.6 100 Bear Trap Meadow 8200 .0 .0 * 15.0 12.1 124 Bone Springs Div 9350 18.7 16.2 115 22.3 20.2 110 Grave Springs 8550 5.5 6.8 81 13.7 14.7 93 Kirwin 9550 19.4 10.5 185 29.3 15.3 192 Marquette 8760 14.0 -M * 23.5 -M * Middle Powder 7760 5.7 9.4 61 14.7 15.8 93 Owl Creek 8975 .0 .0 * 15.6 9.1 171 Powder River Pass 9480 4.7 8.5 55 18.2 16.7 109 Shell Creek 9580 14.5 16.7 87 18.8 18.1 104 Timber Creek 7950 .0 .2 0* 15.1 11.7 129 ----- ----- Basin Index (%) 100 119 SHOSHONE RIVER Blackwater 9780 39.1 24.6 159 46.5 25.2 185 Evening Star 9200 34.9 25.4 137 49.6 32.4 153 Marquette 8760 14.0 -M * 23.5 -M * Sylvan Road 7120 .0 .1 0* 32.5 19.7 165 Younts Peak 8350 6.0 14.2 42 33.5 19.0 176 ----- ----- Basin Index (%) 124 168 POWDER RIVER Bear Trap Meadow 8200 .0 .0 * 15.0 12.1 124 Cloud Peak Reservoir 9860 17.8 16.4 109 26.6 18.8 141 Grave Springs 8550 5.5 6.8 81 13.7 14.7 93 Hansen Sawmill 8360 8.5 .0 * 18.7 12.4 151 Middle Powder 7760 5.7 9.4 61 14.7 15.8 93 Powder River Pass 9480 4.7 8.5 55 18.2 16.7 109 Soldier Park 8720 9.6 -M * 20.7 -M * ----- ----- Basin Index (%) 103 118 TONGUE RIVER Big Goose 7990 9.4 9.2 102 20.2 16.6 122 Bone Springs Div 9350 18.7 16.2 115 22.3 20.2 110 Burgess Junction 7880 8.0 10.9 73 16.1 16.5 98 Dome Lake 8880 14.4 10.3 140 22.4 18.5 121 Little Goose 8870 12.3 -M * 24.3 -M * Sucker Creek 8880 10.7 11.8 91 19.2 19.6 98 Tie Creek 6870 .1 .5 20* 20.0 16.7 120 ----- ----- Basin Index (%) 104 111 BELLE FOURCHE Cole Canyon 5910 .0 .0 * 12.5 14.3 87 ----- ----- Basin Index (%) * 87 CHEYENNE RIVER BASIN Blind Park 6890 .1 .0 * 12.5 16.1 78 North Rapid Creek 6130 .0 .0 * 10.6 14.1 75 ----- ----- Basin Index (%) * 76 UPPER N. PLATTE Arapaho Ridge 10960 21.7 21.9 99 30.4 28.1 108 Blackhall Mtn 9820 30.4 -M * 42.1 -M * Columbine 9160 1.6 9.4 17 32.6 30.1 108 Divide Peak 8880 .4 11.3 4 26.4 25.9 102 Joe Wright 10120 15.0 23.0 65 33.9 32.0 106 Laprele Creek 8375 .2 .0 * 15.9 16.4 97 Med Bow 10500 37.0 -M * 41.3 -M * North French Creek 10130 23.5 32.2 73 34.3 33.0 104 Never Summer 10280 22.3 22.2 100 23.1 -M * Old Battle 10000 35.9 35.8 100 43.6 41.5 105 Rawah 9020 .1 1.5 7 20.8 18.7 111 Sage Creek Basin 7850 -M .0 * 18.3 17.1 107 Sand Lake 10050 31.7 30.9 103 32.2 31.1 104 South Brush Creek 8440 .0 2.1 0 16.9 19.5 87 Tower 10500 40.5 50.3 81 52.0 47.1 110 Webber Springs 9250 14.4 17.1 84 37.5 31.6 119 Willow Creek Pass 9540 13.9 11.8 118 21.0 16.9 124 Zirkel 9340 14.0 17.6 80 47.3 33.1 143 ----- ----- Basin Index (%) 82 110 SWEETWATER Deer Park 9700 31.1 13.9 224 43.5 25.5 171 Larsen Creek 9000 .8 5.3 15 26.1 -M * South Pass 9040 27.5 10.5 262 33.9 22.0 154 ----- ----- Basin Index (%) 200 163 LOWER N. PLATTE Casper Mtn. 7900 3.0 9.8 31 19.7 19.9 99 Laprele Creek 8375 .2 .0 * 15.9 16.4 97 Reno Hill 8400 2.8 8.4 33 20.1 20.7 97 Windy Peak 7900 .0 .0 * 15.3 14.2 108 ----- ----- Basin Index (%) 33 100 LARAMIE RIVER Brooklyn Lake 10240 15.0 20.2 74 27.0 26.5 102 Cinnabar Park 9574 8.2 15.8 52 27.0 29.1 93 Crow Creek 8330 .0 .0 * 12.5 14.8 84 Deadman Hill 10220 16.8 18.4 91 25.2 22.3 113 Rawah 9020 .1 1.5 7 20.8 18.7 111 Roach 9700 10.6 14.2 75 25.8 23.9 108 ----- ----- Basin Index (%) 72 102 S. PLATTE Black Mountain 8920 -M -M * 16.8 -M * Crow Creek 8330 .0 .0 * 12.5 14.8 84 Deadman Hill 10220 16.8 18.4 91 25.2 22.3 113 ----- ----- Basin Index (%) 91* 102 LITTLE SNAKE RIVER Battle Mountain 7440 .0 .0 * 19.6 18.3 107 Divide Peak 8880 .4 11.3 4 26.4 25.9 102 Elk River 8700 .0 4.2 0 23.2 24.1 96 Little Snake River 8915 14.4 18.7 77 43.7 34.9 125 Old Battle 10000 35.9 35.8 100 43.6 41.5 105 Sage Creek Basin 7850 -M .0 * 18.3 17.1 107 Sandstone RS 8150 .0 .0 * 19.6 22.2 88 Whiskey Park 8950 18.3 25.1 73 35.4 33.4 106 ----- ----- Basin Index (%) 73 106 UPPER GREEN RIVER Big Sandy Opening 9080 13.7 8.1 169 25.8 16.5 156 Blind Bull Sum 8650 -M 22.1 * 39.1 22.7 172 East Rim Divide 7930 .0 4.5 0 23.0 13.8 167 Elkhart Park G.S. 9400 13.2 8.9 148 26.7 16.3 164 Gros Ventre Summit 8750 14.8 9.0 164 26.7 15.7 170 Gunsight Pass 9820 20.8 12.4 168 28.6 17.4 164 Kendall R.S. 7740 1.2 .0 * 31.2 16.4 190 Loomis Park 8240 15.4 6.2 248 35.2 20.2 174 New Fork Lake 8340 1.5 1.4 107 20.8 13.2 158 Pocket Creek 9360 -M -M * -M -M * Snider Basin 8060 .0 5.6 0 29.1 16.5 176 Spring Creek Divide 9000 39.8 22.8 175 44.9 27.6 163 Triple Peak 8500 25.7 13.3 193 44.9 29.7 151 ----- ----- Basin Index (%) 158 166 LOWER GREEN RIVER Blacks Fork Jct 8869 .0 -M * 19.1 -M * Buck Pasture 9632 7.2 -M * 27.6 -M * EF Blacks Fork GS 9360 .1 -M * 23.0 -M * Hams Fork 7840 .0 .0 * 23.8 14.1 169 Hewinta 9500 .0 .2 0* 21.1 17.4 121 Hickerson Park 9122 .0 .0 * 14.9 13.1 114 Hole-in-Rock 9168 .0 .0 * 15.7 12.7 124 Indian Creek 9425 35.0 21.3 164 45.0 26.6 169 Kelley R.S. 8180 8.8 7.0 126 33.9 21.4 158 Spirit Lk 10235 6.0 -M * 20.9 -M * Steel Creek Park 10158 16.7 16.9 99 25.5 20.6 124 ----- ----- Basin Index (%) 133* 143 UPPER BEAR RIVER Bear River RS 8777 .0 -M * 21.4 -M * Bug Lake 7987 21.4 10.9 196 37.6 23.0 163 Burts Miller Ranch 8000 .0 -M * 11.8 -M * Chalk Creek #1 9171 26.0 19.9 131 41.1 30.4 135 Hayden Fork 9130 .9 3.8 24 32.6 25.4 128 Kelley R.S. 8180 8.8 7.0 126 33.9 21.4 158 Lily Lake 9133 .0 2.1 0 23.0 21.0 110 Monte Cristo 8932 29.2 19.6 149 44.7 31.2 143 Salt River Summit 7760 5.6 2.1 267 31.8 19.4 164 ----- ----- Basin Index (%) 141 142 ----------------------------------------------------------------------------- -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.