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 SATURDAY: OCTOBER 20 , 2018 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 .1 .0 * 1.2 1.3 92 Black Bear 8170 1.1 1.5 73* 2.9 2.3 126 Blind Bull Sum 8650 .0 .4 0* 1.6 1.3 123 Cottonwood Creek 7670 .3 .0 * 1.7 1.6 106 East Rim Divide 7930 .0 .0 * 1.2 .8 150 Grand Targhee 9260 1.6 3.0 53* 2.7 3.9 69 Granite Creek 6770 .1 .0 * 1.5 1.2 125 Grassy Lake 7265 .2 .0 * 2.2 2.1 105 Gros Ventre Summit 8750 .2 .9 22* 1.0 1.1 91 Gunsight Pass 9820 .0 .5 0* 1.8 1.4 129 Lewis Lake Divide 7850 .0 .0 * 1.6 1.9 84 Phillips Bench 8200 .0 .0 * 1.9 1.4 136 Salt River Summit 7640 .0 .0 * 1.8 1.0 180 Snake River Station 6920 .0 .0 * 1.5 1.7 88 Spring Creek Divide 9000 .5 .4 125* 1.9 1.3 146 Thumb Divide 7980 .0 .0 * 1.3 1.4 93 Togwotee Pass 9580 .9 1.7 53* 1.2 1.6 75 Two Ocean Plateau 9240 1.9 1.9 100* 1.6 1.8 89 Willow Creek 8080 .0 .0 * 2.9 2.2 132 Younts Peak 8350 -M .5 * -M 1.4 * ----- ----- Basin Index (%) 67* 107 MADISON-GALLATIN Black Bear 8170 1.1 1.5 73* 2.9 2.3 126 Canyon 7870 .5 .2 250* 1.7 1.3 131 Madison Plateau 7750 .3 .5 60* 2.1 1.7 124 West Yellowstone 6700 .1 .0 * 1.4 1.3 108 Whiskey Creek 6800 .1 .0 * .9 1.4 64 ----- ----- Basin Index (%) 95* 112 YELLOWSTONE Beartooth Lake 9360 1.0 1.5 67* .9 1.4 64 Burnt Mtn 5880 1.1 .0 * 2.5 2.6 96 Canyon 7870 .5 .2 250* 1.7 1.3 131 Cole Creek 7850 3.0 1.6 188* 2.6 2.2 118 Evening Star 9200 1.5 1.2 125* 2.4 2.0 120 Fisher Creek 9100 1.1 1.4 79* 2.2 2.2 100 Northeast Entrance 7350 .1 .0 * 1.2 1.2 100 Parker Peak 9400 1.7 1.4 121* 2.4 1.8 133 Sylvan Lake 8420 1.4 .8 175* 3.0 2.0 150 Thumb Divide 7980 .0 .0 * 1.3 1.4 93 Two Ocean Plateau 9240 1.9 1.9 100* 1.6 1.8 89 White Mill 8700 .6 1.2 50* 1.2 1.8 67 Wolverine 7650 .0 .0 * 1.1 1.3 85 ----- ----- Basin Index (%) 124* 105 WIND RIVER Burroughs Creek 8750 .0 -M * 1.0 -M * Castle Creek 8400 .0 -M * .8 -M * Cold Springs 9630 1.0 .0 * 1.3 1.2 108 Deer Park 9700 1.2 1.0 120* 1.8 1.7 106 Hobbs Park 10100 1.4 1.0 140* 1.7 1.4 121 Kirwin 9550 .8 .8 100* 1.0 1.2 83 Little Warm 9370 .2 .5 40* 1.6 1.2 133 Owl Creek 8975 1.2 .3 400* 1.3 .9 144 South Pass 9040 1.0 .2 500* 1.8 1.3 138 St. Lawrence Alt 8620 .4 .0 * 1.9 1.1 173 Togwotee Pass 9580 .9 1.7 53* 1.2 1.6 75 Townsend Creek 8700 1.2 .0 * 1.9 1.4 136 ----- ----- Basin Index (%) 169* 119 BIGHORN BASIN Bald Mtn. 9380 1.4 2.0 70* 1.4 1.8 78 Bear Trap Meadow 8200 .9 .2 450* 1.4 1.2 117 Bone Springs Div 9350 1.4 1.6 88* 1.8 1.8 100 Grave Springs 8550 1.1 .3 367* 1.3 1.5 87 Kirwin 9550 .8 .8 100* 1.0 1.2 83 Marquette 8760 .2 -M * 1.1 -M * Middle Powder 7760 1.3 .4 325* 1.6 1.7 94 Owl Creek 8975 1.2 .3 400* 1.3 .9 144 Powder River Pass 9480 .9 .6 150* 1.4 1.4 100 Shell Creek 9580 1.8 2.0 90 2.0 1.6 125 Timber Creek 7950 .8 .0 * 1.2 1.5 80 ----- ----- Basin Index (%) 141* 99 SHOSHONE RIVER Blackwater 9780 1.6 1.6 100* 2.3 1.9 121 Evening Star 9200 1.5 1.2 125* 2.4 2.0 120 Marquette 8760 .2 -M * 1.1 -M * Sylvan Road 7120 .0 .0 * 1.1 1.6 69 Younts Peak 8350 -M .5 * -M 1.4 * ----- ----- Basin Index (%) 111* 105 POWDER RIVER Bear Trap Meadow 8200 .9 .2 450* 1.4 1.2 117 Cloud Peak Reservoir 9860 1.7 1.0 170* 2.0 1.9 105 Grave Springs 8550 1.1 .3 367* 1.3 1.5 87 Hansen Sawmill 8360 1.2 .0 * 1.8 1.3 138 Middle Powder 7760 1.3 .4 325* 1.6 1.7 94 Powder River Pass 9480 .9 .6 150* 1.4 1.4 100 Soldier Park 8720 1.1 -M * 1.6 -M * ----- ----- Basin Index (%) 284* 106 TONGUE RIVER Big Goose 7990 1.3 .5 260* 2.1 1.8 117 Bone Springs Div 9350 1.4 1.6 88* 1.8 1.8 100 Burgess Junction 7880 1.2 .6 200* 1.7 1.6 106 Dome Lake 8880 1.3 1.0 130* 2.0 1.9 105 Little Goose 8870 1.8 -M * 1.7 -M * Sucker Creek 8880 1.6 .8 200* 2.0 1.8 111 Tie Creek 6870 1.3 .0 * 2.6 1.9 137 ----- ----- Basin Index (%) 180* 113 BELLE FOURCHE Cole Canyon 5910 .0 .0 * 1.5 1.3 115 ----- ----- Basin Index (%) * 115 CHEYENNE RIVER BASIN Blind Park 6890 .0 .0 * .9 1.6 56 North Rapid Creek 6130 .0 .0 * .7 1.4 50 ----- ----- Basin Index (%) * 53 UPPER N. PLATTE Arapaho Ridge 10960 -M 1.5 * -M 1.9 * Blackhall Mtn 9820 1.2 -M * 3.6 -M * Columbine 9160 .1 .0 * 3.1 1.7 182 Divide Peak 8880 .7 .5 140* 3.2 2.0 160 Joe Wright 10120 1.9 .8 238* 4.3 2.2 195 Laprele Creek 8375 .7 .0 * 1.3 1.2 108 Med Bow 10500 1.0 -M * 3.2 -M * North French Creek 10130 .7 1.2 58* 2.5 2.1 119 Never Summer 10280 2.0 1.0 200* 3.4 -M * Old Battle 10000 2.1 1.3 162* 4.4 2.7 163 Rawah 9020 1.1 .0 * 2.8 1.3 215 Sage Creek Basin 7850 .1 .0 * 2.5 1.3 192 Sand Lake 10050 1.0 1.4 71* 1.7 2.0 85 South Brush Creek 8440 .0 .0 * 1.4 1.5 93 Tower 10500 2.7 1.7 159* 3.3 2.7 122 Webber Springs 9250 1.1 .2 550* 3.8 2.0 190 Willow Creek Pass 9540 1.5 .3 500* 2.7 1.2 225 Zirkel 9340 .1 .0 * 3.3 2.6 127 ----- ----- Basin Index (%) 188* 152 SWEETWATER Deer Park 9700 1.2 1.0 120* 1.8 1.7 106 Larsen Creek 9000 .0 .0 * 1.5 -M * South Pass 9040 1.0 .2 500* 1.8 1.3 138 ----- ----- Basin Index (%) 183* 120 LOWER N. PLATTE Casper Mtn. 7900 .4 .2 200* 1.4 1.7 82 Laprele Creek 8375 .7 .0 * 1.3 1.2 108 Reno Hill 8400 1.0 .6 167* 1.4 1.6 88 Windy Peak 7900 .8 .0 * .7 1.1 64 ----- ----- Basin Index (%) 362* 86 LARAMIE RIVER Brooklyn Lake 10240 .9 .3 300* 1.9 1.5 127 Cinnabar Park 9574 1.5 .5 300* 2.8 1.7 165 Crow Creek 8330 .4 .0 * 1.6 1.3 123 Deadman Hill 10220 1.5 1.1 136* 2.2 1.6 138 Rawah 9020 1.1 .0 * 2.8 1.3 215 Roach 9700 1.4 .3 467* 2.5 1.6 156 ----- ----- Basin Index (%) 309* 153 S. PLATTE Black Mountain 8920 .8 -M * 1.5 -M * Crow Creek 8330 .4 .0 * 1.6 1.3 123 Deadman Hill 10220 1.5 1.1 136* 2.2 1.6 138 ----- ----- Basin Index (%) 173* 131 LITTLE SNAKE RIVER Battle Mountain 7440 .2 .0 * 2.0 1.1 182 Divide Peak 8880 .7 .5 140* 3.2 2.0 160 Elk River 8700 .2 .0 * 2.1 1.6 131 Little Snake River 8915 .0 .3 0* 4.7 2.7 174 Old Battle 10000 2.1 1.3 162* 4.4 2.7 163 Sage Creek Basin 7850 .1 .0 * 2.5 1.3 192 Sandstone RS 8150 .1 .0 * 2.3 1.3 177 Whiskey Park 8950 1.4 .1 1400* 3.8 1.8 211 ----- ----- Basin Index (%) 218* 172 UPPER GREEN RIVER Big Sandy Opening 9080 .5 .6 83* 1.6 1.1 145 Blind Bull Sum 8650 .0 .4 0* 1.6 1.3 123 East Rim Divide 7930 .0 .0 * 1.2 .8 150 Elkhart Park G.S. 9400 1.1 .4 275* 2.3 1.2 192 Gros Ventre Summit 8750 .2 .9 22* 1.0 1.1 91 Gunsight Pass 9820 .0 .5 0* 1.8 1.4 129 Kendall R.S. 7740 .2 .0 * 1.2 .9 133 Loomis Park 8240 -M .0 * -M 1.0 * New Fork Lake 8340 .0 .0 * 1.2 .8 150 Pocket Creek 9360 1.0 -M * 2.3 -M * Snyder Basin 8060 .0 .0 * 1.6 .9 178 Spring Creek Divide 9000 .5 .4 125* 1.9 1.3 146 Triple Peak 8500 .5 .2 250* 1.9 1.4 136 ----- ----- Basin Index (%) 88* 142 LOWER GREEN RIVER Blacks Fork Jct 8869 .0 -M * 2.1 -M * Buck Pasture 9632 .2 -M * 3.1 -M * EF Blacks Fork GS 9360 .2 -M * 2.2 -M * Hams Fork 7840 .0 .0 * 1.6 .8 200 Hewinta 9500 .0 .0 * 2.3 1.3 177 Hickerson Park 9122 1.8 .0 * 3.2 1.1 291 Hole-in-Rock 9168 .1 .0 * 2.7 1.2 225 Indian Creek 9425 .3 .8 38* 1.6 1.3 123 Kelley R.S. 8180 .8 .0 * 1.6 1.1 145 Spirit Lk 10235 1.7 -M * 4.4 -M * Steel Creek Park 10158 .5 .6 83* 2.5 1.5 167 ----- ----- Basin Index (%) 250* 187 UPPER BEAR RIVER Bear River RS 8777 .0 -M * 2.4 -M * Bug Lake 7987 .8 .0 * 3.5 1.4 250 Burts Miller Ranch 8000 .2 -M * 1.5 -M * Chalk Creek #1 9171 .7 .3 233* 5.1 1.9 268 Hayden Fork 9130 .0 .0 * 3.6 1.6 225 Kelley R.S. 8180 .8 .0 * 1.6 1.1 145 Lily Lake 9133 .0 .0 * 2.5 1.5 167 Monte Cristo 8932 1.3 .0 * 3.0 1.7 176 Salt River Summit 7640 .0 .0 * 1.8 1.0 180 ----- ----- Basin Index (%) 1200* 207 ----------------------------------------------------------------------------- -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.