An atmospheric river will bring heavy rainfall to lower elevations of California this week, and heavy snow to the Sierra Nevada mountains. Flash flooding, some of which may be locally considerable, will be a concern on the western foothills of the Sierra Nevada mountains through Tuesday. Landslides, rockfalls and mudslides are possible in the Southern California mountains. 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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