Back-to-back powerful Pacific storm systems to impact the Pacific Northwest and northern California through the end of this week with heavy rain, flooding, strong winds, and higher elevation mountain snow. A strong, long-duration atmospheric river will accompany the Pacific storms, bringing excessive rainfall and flash flooding to southwest Oregon and northwest California through the week. Read More >
Overview
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December 21, 2017 A strong cold front pushed south across Wyoming Wednesday afternoon and evening. Strong north winds accompanied the front with the Buffalo Airport recording a peak wind gust of 54 mph Wednesday evening. The heaviest snow fell across the WInd River Basin and in the Casper area Wednesday night, with over 8 inches of snow measured in Lander, and nearly 7 inches of snow reported at the Natrona International Airport in Casper. |
 Map of Storm Total Snowfall for December 20-21, 2017 (click to enlarge) |
| Snow and blowing snow at the Riverton National Weather Service Office around 9 pm Wednesday |
Wind:
***** Peak Wind Reports ***** ...Wind Reports... Location Speed Time/Date Elevation (ft.) ...Wyoming... ...Big Horn County... Greybull Airport 45 MPH 0809 PM 12/20 3935 Cowley Airport 38 MPH 1255 PM 12/20 4090 Lovell 35 MPH 0601 PM 12/20 3830 ...Fremont County... Boysen Reservoir 50 MPH 0815 PM 12/20 4710 2 W South Pass City 44 MPH 0321 AM 12/21 8185 Riverton Airport 40 MPH 0802 PM 12/20 5525 ...Johnson County... Buffalo Airport 54 MPH 0856 PM 12/20 4970 5 ESE Story 52 MPH 0326 PM 12/20 4673 12 N Kaycee 52 MPH 0446 PM 12/20 5287 25 ESE Buffalo 50 MPH 0515 PM 12/20 4657 Kaycee 39 MPH 0454 PM 12/20 4681 7 NE Buffalo 38 MPH 0317 PM 12/20 4370 20 SW Echeta 37 MPH 0505 PM 12/20 4068 ...Natrona County... 8 S Casper 44 MPH 0452 AM 12/21 7740 7 W Alcova 37 MPH 1105 PM 12/20 6342 ...Park County... Powell Airport 52 MPH 0715 PM 12/20 5050 8 N Meeteetse 51 MPH 0431 PM 12/20 5926 2 N Frannie 49 MPH 0733 PM 12/20 4275 Powell 40 MPH 0330 PM 12/20 4386 1 W Clark 38 MPH 0513 PM 12/20 4270 I 80 - Mile Marker 184 41 MPH 0231 AM 12/21 7112 7 WNW Green River 40 MPH 0112 PM 12/20 6387 15 SE Rock Springs 39 MPH 0144 PM 12/20 7550 1 NNE Green River 35 MPH 1247 PM 12/20 6315 Observations are collected from a variety of sources with varying equipment and exposures. We thank all volunteer weather observers for their dedication. Not all data listed are considered official. $$
Snow
Public Information Statement...Updated National Weather Service Riverton WY 536 PM MST Thu Dec 21 2017 ...Final Storm Total Snow Amounts and Peak Wind Gusts for December 20-21, 2017... The following are the final cumulative snowfall amounts from December 20-21, 2017; and peak wind gusts from Wednesday afternoon through Wednesday night. Observations are collected from a variety of sources with varying equipment and exposures. We thank all volunteer weather observers for their dedication. Not all data listed are considered official. ***** Snowfall Reports for December 20-21, 2017 ***** Location Snowfall Big Horn County... Bald Mountain Snotel... 1 inch. 2 SSW Lovell... 0.3 inches. Fremont County... 9 SSE Lander... 12 inches. 9 SSE Lander... 10.4 inches. Hudson... 9.5 inches. 3 SW Lander... 9 inches. Lander Airport... 8.3 inches. 6 SW Lander... 8.2 inches. Lander... 8.1 inches. 1 N Lander... 7.3 inches. Hobbs Park Snotel... 6 inches. Little Warm Snotel... 5 inches. Townsend Creek Snotel... 5 inches. 4 SW Lander... 5 inches. Jeffrey City... 5 inches. 2 W Riverton... 4.7 inches. Riverton... 4 inches. 9.5 SW Lander... 4 inches. Burroughs Creek Snotel... 4 inches. Deer Park Snotel... 4 inches. 2 W Riverton... 3.5 inches. 4 W Riverton... 3 inches. Cold Springs Snotel... 3 inches. South Pass Snotel... 3 inches. Riverton Airport... 2.5 inches. 3 W Riverton... 2.5 inches. 7 WNW Lander... 2.3 inches. Dubois... 2 inches. St. Lawrence Alt Snotel... 2 inches. Castle Creek Snotel... 2 inches. Atlantic City... 1.2 inches. Burris... 1 inch. Brooks Lake... 0.1 inches. Hot Springs County... 9 NE Thermopolis... 2 inches. Thermopolis... 2 inches. Kirby... 1.3 inches. Johnson County... 17 NNW Kaycee... 2 inches. 17 E Kaycee... 2 inches. Bear Trap Meadow Snotel... 1 inch. Hansen Sawmill Snotel... 1 inch. Cloud Peak Reservoir Snotel... 1 inch. Soldier Park Snotel... 1 inch. 13 SSE Buffalo... 0.5 inches. 4 SSW Buffalo... 0.2 inches. Buffalo... 0.2 inches. Lincoln County... 3 SE Bedford... 4 inches. 5 NNE Thayne... 3.5 inches. Willow Creek Snotel... 3 inches. 5 SSE Smoot... 3 inches. Blind Bull Summit Snotel... 2 inches. 2 SE Thayne... 2 inches. Fossil Butte... 1 inch. Cottonwood Creek Snotel... 1 inch. Box Y Ranch... 1 inch. Indian Creek Snotel... 1 inch. Spring Creek Divide Snotel... 1 inch. Salt River Summit Snotel... 1 inch. Afton... 1 inch. Blind Bull Summit... 1 inch. Commissary Ridge... 0.2 inches. Natrona County... Casper Mountain Snotel... 7 inches. Casper Airport... 6.8 inches. Casper... 3.5 - 6.2 inches. 1 S Casper... 4.3 inches. 4 WSW Casper... 4.1 inches. Reno Hill Snotel... 4 inches. 10 WSW Casper... 4 inches. Casper... 3.5 inches. Powder River... 3.5 inches. Grave Springs Snotel... 2 inches. Park County... Wolverine Snotel... 7 inches. Beartooth Lake Snotel... 5 inches. Blackwater Snotel... 3 inches. Evening Star Snotel... 3 inches. 2 WSW Cody... 2 inches. Cody... 2 inches. Pahaska... 1.5 inches. 4 SE Cody... 1.4 inches. 3 NE Sunshine... 1 inch. Kirwin Snotel... 1 inch. 26 SW Cody... 0.5 inches. Sublette County... Pocket Creek Snotel... 3 inches. Loomis Park Snotel... 3 inches. Big Sandy Opening Snotel... 2 inches. Triple Peak Snotel... 2 inches. East Rim Divide Snotel... 2 inches. Gunsite Pass Snotel... 2 inches. Kendall Ranger Station Snotel... 2 inches. Larsen Creek Snotel... 2 inches. Bondurant... 1.8 inches. Snider Basin Snotel... 1 inch. Sweetwater County... Buckboard Marina... 3 inches. Rock Springs... 2.7 inches. 4 NNW Rock Springs... 2 inches. Green River... 2 inches. 2 NNE Farson... 1 inch. Teton County... Jackson Hole - Raymer... 6 inches. Jackson Hole - Rendezvous Bowl... 6 inches. Grassy Lake Snotel... 5 inches. Gros Ventre Summit Snotel... 5 inches. Phillips Bench Snotel... 5 inches. Togwotee Pass Snotel... 5 inches. Granite Creek Snotel... 4 inches. Jackson Hole - Mid Mountain... 3.5 inches. Grand Targhee - Chief Joseph... 3 inches. 3 SSW Wilson... 3 inches. 2 NE Teton Village... 2.5 inches. Jackson... 2.1 inches. Jackson Hole - Base... 2 inches. Snake River Stn Snotel... 2 inches. Base Camp Snotel... 2 inches. Snow King... 2 inches. Jackson Dam... 1.7 inches. Darwin Ranch... 1.7 inches. 5 NW Jackson... 1.5 inches. Grand Targhee Snotel... 1 inch. Togwotee Mountain Lodge... 0.1 inches. Washakie County... 16 SSE Ten Sleep... 4 inches. Middle Powder Snotel... 4 inches. 27 S Ten Sleep... 1.5 inches. Powder River Pass Snotel... 1 inch. Winchester... 0.8 inches. Yellowstone National Park... Snake River Ranger Station... 6.8 inches. Canyon Snotel... 6 inches. Lamar Ranger Station... 5 inches. Two Ocean Plateau Snotel... 5 inches. Lewis Lake Divide Snotel... 5 inches. Parker Peak Snotel... 4 inches. Thumb Divide Snotel... 4 inches. Sylvan Lake Snotel... 3 inches. Mammoth... 2.5 inches. Tower Falls Ranger Station... 2.5 inches. Sylvan Road Snotel... 1 inch.
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