The foremost concern addressed in this briefing pertains to the significant lake effect snow impacting regions downwind of Lakes Erie and Ontario, where winter storm warnings are currently in effect. The National Weather Service has indicated that snowfall rates may reach an alarming 2 to 3 inches per hour, accompanied by hazardous blowing and drifting snow, culminating in near whiteout conditions that are expected to persist through Wednesday afternoon. Furthermore, marine hazards on the Great Lakes have been exacerbated by heavy freezing spray warnings, which pose a substantial threat to vessels in these frigid waters. In addition to the winter weather, a G4 severe geomagnetic storm watch has been issued, suggesting possible disruptions to high-frequency radio, GPS, and satellite operations, while offering the potential for auroras to be visible under clear skies in various parts of the United States. As we navigate these multifaceted weather challenges, we urge our listeners to remain vigilant and prepared for the conditions ahead.

Takeaways:

1. The National Weather Service has issued winter storm warnings due to lake effect snow.
2. Marine hazards are present on the Great Lakes, with warnings for heavy freezing spray.
3. A G4 severe geomagnetic storm watch has been confirmed, affecting radio and GPS systems.
4. Wind chill temperatures in Southeast Michigan are dangerously low, reaching -15 degrees Fahrenheit.
5. Additional snowfall of 6 to 12 inches is expected in certain areas of New York.
6. Stagnant air and dense fog advisories are currently being issued in parts of Washington.

Sources

[NWS Baltimore/Washington | briefing/outlook, https://www.weather.gov/lwx/]

[NWS Boston/Norton | hazards, https://www.weather.gov/box/]

[NWS Detroit/Pontiac | homepage hazards, https://www.weather.gov/dtx/]

[NWS Buffalo | warnings/HWO, https://www.weather.gov/wwamap/wwatxtget.php?cwa=buf&wwa=all]

[NWS Cleveland | marine warning, https://www.weather.gov/cle/marine_forecast]

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

[NWS Cleveland | Lake Erie marine warning, https://www.weather.gov/cle/marine_forecast]

[NWS Houston/Galveston | homepage briefing, https://www.weather.gov/hgx/]

[NWS Seattle | hazards/air stagnation, https://www.weather.gov/sew/]