An upper-level disturbance will bring two rounds of ice, snow, and heavy rain across most of the Eastern US. While many places in the Southeast and Mid-Atlantic welcome warmer temperatures this week, cooler weather is on its way this weekend after the storm’s passage.

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 dive right in.

Dangerous Icy Conditions Continue:

  1. Freezing temps across the Midwest will end early this morning, but could still have significant effects on this morning’s commute. Additionally, other parts of the Northern Tier will face icing up to 0.5″ by Thursday morning.
  2. Chicago and other Midwest cities were under a thick glaze of ice last night – one that will likely continue into this morning. As freezing rain turns to plain rain for the region, untreated roads and sidewalks will become extremely slick this morning due to 0.25-0.75″ of ice accumulation. Drivers should travel with caution, taking care to go slowly and leave extra time this morning.
  3. As this system moves east, icing threats will shift from the Midwest to the Great Lakes and New England today. Precipitation will likely switch from snow/sleet to freezing rain throughout the late morning/early afternoon today. While not as widespread, a glaze can still be expected over much of Upstate NY and Northern New England by tonight. Accumulations will be highest just downwind of Lake Ontario and Eastern MA, where icing could reach 0.5″ in some areas.
  4. Freezing rain will likely change to all/mostly rain by early Thursday morning from west to east. Rain will likely be light early Thursday before a lull proceeding the second, heavier rain storm for the Northeast.

Flooding for the Ohio River Valley Until Friday:

  1. Rain has already started for the Midwest, and a break is not in sight. A frontal boundary will create more trouble Thursday as heavy rain and isolated severe thunderstorms will continue to soak the region.
  2. Flash flood watches are already in effect for much of the Ohio Valley as moderate to heavy rain continues to pour down over the region. This morning, over an inch has already fallen over much of the area, with even more to come.
  3. The heaviest rains will arrive Thursday ahead of a strong frontal boundary. This clash will bring about a threat for isolated severe thunderstorms, something not very common for this time of year. Within these storms, localized rainfall totals will likely be higher than depicted above.
  4. Thursday evening, rains will shift further east, moving into the Northeast. Minor flooding could be a problem for flood prone areas overnight Thursday into Friday. East of the Midwest, rainfall totals are expected to reach 1-1.5″ by Friday afternoon.

Winter Temps Likely to Return This Weekend:

  1. After an enjoyable, spring-like beginning of the week, warm temperatures will be dampened by rain and, in some places, a wintry mix. The passage of Friday’s big rain storm will also usher in much more seasonable winter temperatures.
  2. As our end-of-the-week surface low moves out of the region, right behind it will be powerful trough. Sharp changes in pressure aloft often correlate to an equally powerful jet streak, which will bring flow from the North instead of the South.
  3. Colder air will bring much more seasonable temperatures across the Eastern half of the country this weekend. While certainly not as potent as last week’s extreme freeze, temperatures below freezing will be more commonplace for the Northeast as we move into next week.

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Author

Kathleen is a writer and meteorological consultant at WeatherOptics. A recent graduate from Stony Brook University, Kathleen has earned her B.S. in Atmospheric and Oceanic Sciences. Previously, she has done research on the role of Atmospheric Rivers on Arctic Amplification and forecasted for local pages like SBU Weather.

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