The primary focus of today's discourse revolves around the significant meteorological phenomena currently impacting the Pacific Northwest and broader regions, particularly the atmospheric river event poised to unleash excessive rainfall and potential flooding through the evening. I shall elucidate the ongoing weather developments, including the implications of a powerful Pacific storm that is intensifying conditions across western Washington and Oregon. Furthermore, we will convey pertinent information regarding the hazardous winter weather conditions anticipated in Wyoming, Idaho, and parts of Montana, characterized by substantial snowfall and challenging travel conditions. In addition, I will provide updates on the recent magnitude 7.0 earthquake near the Alaska Yukon border, which has generated a sequence of aftershocks, albeit without any reported major damage. As we proceed, I will also address the anticipated geomagnetic storm, which may yield auroral displays further south and could impart minor impacts on power communications.

Takeaways:

• The Pacific storm currently affecting the Northwest is causing significant rainfall and flood risks.
• Western Washington and Oregon are expected to experience hazardous conditions due to heavy rain and river rises.
• Wyoming, Idaho, and parts of Montana are facing challenging travel conditions due to winter weather impacts.
• The magnitude 7.0 earthquake near the Alaska Yukon border has resulted in ongoing aftershocks but no major damage.
• The National Weather Service has issued winter storm warnings and advisories for multiple states due to impending severe weather.
• NOAA has issued a geomagnetic storm watch that may result in auroras and minor power impacts in the coming days.

Sources

[Alaska Earthquake Center | https://earthquake.alaska.edu/december-6-magnitude-7-near-canadian-border]

[USGS | https://www.usgs.gov/programs/earthquake-hazards]

[NWS Anchorage | https://www.weather.gov/afc]

[NWS Pocatello | https://www.weather.gov/pih/?fbclid=IwAR0_ckvDXfR4VXoKRD8bR1NSqT1ctL_aY_js-lugQKeD_1Q_hcsNvAhSHTA]

[NWS Pocatello Winter Page | https://www.weather.gov/pih/winter]

[NWS Billings | https://www.weather.gov/byz/]

[NWS Billings (preview) | https://preview.weather.gov/byz/]

[NWS Portland | https://www.weather.gov/pqr/]

[WPC Day-1 ERO | https://www.wpc.ncep.noaa.gov/qpf/ero.php?day=1&opt=curr]

[NWS Seattle | https://www.weather.gov/sew/]

[NWS Spokane | https://www.weather.gov/otx/]

[WPC Day-1 ERO | https://www.wpc.ncep.noaa.gov/qpf/ero.php?day=1&opt=curr]

[NWS Riverton | https://www.weather.gov/riw/winter]

[WYDOT I-25 District 2 | https://www.wyoroad.info/highway/conditions/dist2.html]

[WYDOT I-80 Route | https://www.wyoroad.info/pls/Browse/WRR.RoutesResults?SelectedRoute=I80]

[WYDOT US-287 | https://wyoroad.info/pls/Browse/WRR.RoutesResults?SelectedRoute=US287]

[WYDOT US-191 | https://www.wyoroad.info/pls/Browse/WRR.RoutesResults?SelectedRoute=US191]