A strong atmospheric river will bring heavy rainfall to California through the holiday week. The heaviest rainfall is expected on Wednesday in the Los Angeles Basin. Flash and urban flooding is possible. A prolonged heavy snowfall is expected in the Sierra Nevada from the atmospheric river, raising concerns for major snow‐load impacts. Travel may be difficult to impossible over the passes. Read More >
Overview
Periods of heavy snowfall occurred across Yellowstone National Park, and the Absaroka Mountains from Thursday night through Saturday morning. At the same time very strong mountain top winds were observed as well as between Rock Springs to Casper. An Arctic cold front pushed south, east of the Divide Friday with bitter cold temperatures in the single digits above and below zero. South of this Arctic front unseasonably warm temperatures were observed Friday with Rock Springs tying a record high of 47 degrees. Another surge of Arctic air on Saturday combining with a disturbance aloft produced a line of moderate to heavy snow east of the Divide with most areas seeing 1 to 3 inches of new snowfall.
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 Snowfall Totals for December 29th and 30th |
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| Cody Snow Picture (courtesy of Jeremy J.) | Heavy snow in Casper Saturday Evening | Contrast of temperatures at 3 PM Friday |
Wind:
...Peak Wind Gusts from Thursday night through Saturday... ...Big Horn County... 30 E Greybull 46 MPH 0358 PM 12/30 8898 ...Fremont County... 7 SW Muddy Gap 95 MPH 1250 PM 12/30 7380 10 W Fort Washakie 74 MPH 0201 AM 12/30 9235 3 S Togwotee Pass 71 MPH 1200 PM 12/30 10430 Red Canyon 65 MPH 1220 PM 12/30 6768 10 N Dubois 63 MPH 1257 PM 12/30 8085 7 NW Lander 61 MPH 0819 AM 12/29 5797 Beaver Rim 60 MPH 1046 AM 12/30 6784 2 W South Pass City 60 MPH 0746 AM 12/29 8185 8 W South Pass City 55 MPH 0350 AM 12/29 8120 9 SW Lander 53 MPH 0500 AM 12/29 7085 19 WSW Dubois 48 MPH 1210 PM 12/30 8833 Jeffrey City 46 MPH 1147 AM 12/30 6374 South Pass 45 MPH 0455 PM 12/30 8556 ...Johnson County... 18 NW Buffalo 69 MPH 0447 AM 12/30 8604 7 SW Barnum 58 MPH 0346 AM 12/29 6440 12 N Kaycee 51 MPH 1236 PM 12/30 5287 Buffalo Airport 49 MPH 1136 AM 12/30 4970 5 ESE Story 45 MPH 0611 AM 12/29 4673 25 ESE Buffalo 45 MPH 0545 AM 12/29 4657 ...Natrona County... 16 S Hiland 64 MPH 0210 AM 12/29 6380 Casper Outer Drive 62 MPH 0336 AM 12/29 5463 3 WSW Mills 46 MPH 0257 AM 12/29 5197 7 W Alcova 45 MPH 0145 PM 12/30 6342 ...Park County... Hoyt Peak 93 MPH 1130 AM 12/30 9800 Chief Joseph Hwy 73 MPH 0130 AM 12/29 8136 10 WNW Cody 69 MPH 0140 AM 12/29 8401 5 WNW Clark 68 MPH 1138 PM 12/28 4659 Crandall 58 MPH 0212 PM 12/30 6640 20 SW Cody 55 MPH 1250 AM 12/29 5843 3 E Pahaska 54 MPH 1257 PM 12/30 7500 14 S Sylvan Pass 46 MPH 1008 AM 12/30 8650 ...Sublette County... Big Piney Airport 45 MPH 1020 AM 12/30 6974 2 NW Bondurant 45 MPH 0351 PM 12/30 6726 ...Sweetwater County... 15 SE Rock Springs 58 MPH 0244 AM 12/29 7550 I 80 - Mile Marker 142 57 MPH 0205 PM 12/30 7162 Rock Springs Airport 52 MPH 1252 AM 12/29 6760 1 NNE Green River 51 MPH 0132 PM 12/30 6315 5 E Rock Springs 49 MPH 0220 PM 12/30 6369 Mckinnon 47 MPH 1241 PM 12/30 7086 I 80 - Mile Marker 184 45 MPH 0416 PM 12/30 7112 20 ENE Opal 45 MPH 1121 AM 12/30 6556 I 80 - Mile Marker 124 45 MPH 0106 PM 12/29 6475 Farson 45 MPH 1230 PM 12/30 6594 ...Teton County... Summit - Jackson Resort 72 MPH 1100 AM 12/30 10318 5 ENE Alta - Freds Mtn 60 MPH 1115 AM 12/30 9840 Jackson Hole Airport 60 MPH 1223 PM 12/30 6445 4 N Moose 56 MPH 1158 PM 12/29 6730 2 WNW Teton Village 50 MPH 0330 AM 12/29 7913
Snow
Location Snowfall Big Horn County... Bone Springs Divide Snotel... 4 inches. Basin... 3.5 inches. Bald Mountain Snotel... 3 inches. Shell Creek Snotel... 3 inches. 9 NNW Shell... 2.2 inches. 2 SSW Lovell... 2 inches. Lovell... 1.5 inches. Greybull... 1 inch. 9 ENE Greybull... 0.5 inches. Fremont County... Burroughs Creek Snotel... 8 inches. Castle Creek Snotel... 5 inches. Little Warm Snotel... 4 inches. Cold Springs Snotel... 2 inches. Brooks Lake... 2 inches. Pavillion... 0.5 inches. Dubois... 0.5 inches. Riverton... 0.4 inches. Riverton Airport... 0.4 inches. Lander Airport... 0.1 inches. Hot Springs County... 9 NE Thermopolis... 3.7 inches. Kirby... 3 inches. Thermopolis... 2 inches. Owl Creek Snotel... 1 inch. Johnson County... Cloud Peak Reservoir Snotel... 8 inches. Buffalo... 2.5 inches. Little Goose Snotel... 2 inches. Soldier Park Snotel... 2 inches. Buffalo... 1.4 inches. Hansen Sawmill Snotel... 1 inch. 4 SSW Buffalo... 1 inch. 13 SSE Buffalo... 1 inch. Lincoln County... Kelley Ranger Station Snotel... 1 inch. Cottonwood Creek Snotel... 1 inch. Natrona County... Casper area... 1 to 3 inches. Reno Hill Snotel... 3 inches. Casper Airport... 2.2 inches. Casper Mountain Snotel... 2 inches. Powder River... 1 inch. Midwest... 1 inch. 10 WSW Casper... 0.8 inches. 11 WSW Casper... 0.5 inches. Park County... Beartooth Lake Snotel... 25 inches. Blackwater Snotel... 16 inches. Evening Star Snotel... 15 inches. Pahaska... 9 inches. Kirwin Snotel... 8 inches. Wolverine Snotel... 8 inches. Cody area... 3 to 6 inches. 3 NE Clark... 3 inches. 4 SE Cody... 2.8 inches. Timber Creek Snotel... 2 inches. 4 SW Powell... 1.5 inches. Powell... 1.5 inches. 26 SW Cody... 1.4 inches. 3 NE Sunshine... 1.1 inches. Marquette Snotel... 1 inch. 4 ENE Powell... 0.9 inches. Sublette County... Kendall Ranger Station Snotel... 4 inches. Gunsite Pass Snotel... 4 inches. Elkhart Park G.S. Snotel... 2 inches. Loomis Park Snotel... 2 inches. Teton County... Togwotee Pass Snotel... 7 inches. Togwotee Mountain Lodge... 5 inches. Jackson Hole - Mid Mountain... 3.2 inches. Phillips Bench Snotel... 3 inches. Gros Ventre Summit Snotel... 3 inches. Jackson Hole - Raymer... 2.2 inches. Jackson Hole - Rendezvous Bowl... 2.2 inches. 3 SSW Wilson... 2 inches. Granite Creek Snotel... 2 inches. Snake River Stn Snotel... 2 inches. Grand Targhee - Chief Joseph... 2 inches. Darwin Ranch... 1.8 inches. Moose... 1.6 inches. Jackson Hole - Base... 1.1 inches. Base Camp Snotel... 1 inch. Grand Targhee Snotel... 1 inch. Grassy Lake Snotel... 1 inch. 5 NW Jackson... 1 inch. 12 NE Jackson... 1 inch. 2 NE Teton Village... 0.8 inches. Jackson Dam... 0.8 inches. Jackson... 0.1 inches. Snow King... 0.1 inches. Washakie County... 8 SW Worland... 2 inches. Powder River Pass Snotel... 2 inches. Worland... 2 inches. 5 NNW Ten Sleep... 1.8 inches. 27 S Ten Sleep... 1.1 inches. Winchester... 1 inch. Ten Sleep... 0.9 inches. 16 SSE Ten Sleep... 0.5 inches. Yellowstone National Park... Parker Peak Snotel... 13 inches. Two Ocean Plateau Snotel... 8 inches. Sylvan Road Snotel... 8 inches. Old Faithful Ranger Station... 8 inches. Sylvan Lake Snotel... 5 inches. Canyon Snotel... 4 inches. Thumb Divide Snotel... 3 inches. Lewis Lake Divide Snotel... 3 inches. Snake River Ranger Station... 1.8 inches. Lamar Ranger Station... 0.8 inches.
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