What started as a quiet week will start to ramp up as storm systems target both coasts, hitting the West Coast today and tomorrow and the East Coast tomorrow and Friday. In the meantime though, the Central US will continue to handle the effects of devastating flooding that shows no signs of letting up before the week is out.

Welcome to the Wednesday edition of your Morning Briefing, where we’ll give you a quick rundown on everything you need to know weather-wise, every weekday morning. Let’s begin.

West Coast Rain and Mountain Snow:

  1. An approaching cold front has already pushed rain onshore last night over Central and Southern California. This system, along with another on Friday, will drop some light to moderate rain and mountain snow over the region.
  2. Through tomorrow morning, up to about an inch of rain is likely to fall along the coast, while about 4-6″ of snow is possible for higher elevations of the Sierras.
  3. Some thunderstorms are likely to form today as well, lasting possibly into tonight. Although these are not likely severe, thunderstorms could still increase local rain totals by about 0.25-0.5″. Localized flooding is possible, especially in low lying, flood-prone, or urban areas.

End of the Week East Coast Storm:

  1. As the week progresses, we’ll see two separate low pressure systems approach the East coast, one will be a clipper from Canada, and the other will be riding up the coast. By Thursday morning, rain will enter the region, followed by some late-season snow Friday into Saturday.
  2. The incoming coastal storm will be the stronger of the two systems, causing the most trouble for the Mid-Atlantic and Southern New England as 1-2″ of rain possibly drops over the region by Friday evening. Moderate rainfall is expected for most areas, with locally heavier rain being where we’ll see 2″ of accumulations.
  3. As we move into Friday night, a transition to snow for the interior Northeast is very likely. Overall accumulations will be light, with generally 2-4″ across the region by Saturday night. Higher elevations in Upstate NY and Northern New England could possibly see up to 6″.
  4. Despite being a late-season snow event, this system is not expected to drop significant or disruptive amounts of snow onto the region. The biggest problems we could see this weekend would be related to possible flooding, especially in urban areas, or areas with enhanced precipitation.

Devastating Flooding Persists:

  1. Dry weather this week will do little to help the historic flooding that continues to ravage much of the Central US. Many roads remain closed, and property are destroyed as we wait for river levels to go down – something that likely won’t happen for days.
  2. Flood advisories remain in effect over many parts of the region, seeing as many parts of the Missouri, Mississippi, and Illinois Rivers continue to be in moderate to major flood stages. The swollen rivers have engulfed entire neighborhoods in parts of Nebraska and Iowa. River levels aren’t forecasted to go down until at least the end of the week, and could even persist for longer.
  3. Flooding is also a concern later this week for parts of the Northwest and Northern Rockies. Warmer temperatures will likely cause snow melt and ice jams, which could flood rivers, roads, and low-lying areas.

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Kathleen is a Meteorologist at WeatherOptics, where she works writing content for the website, providing accurate and detailed forecasts to clients, and consulting on various meteorological projects. Kathleen earned her B.S. in Atmospheric and Oceanic Sciences in 2018 from Stony Brook University. Kathleen has also done research into our changing climate by investigating theRole of Atmospheric Rivers on Arctic Amplification in 2017.

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