After a snowy beginning to March, things will likely wind down a bit as Spring slowly takes over. But winter still has a few more punches left this week in the form of a deep freeze across the Eastern half of the country, heavy lake-effect snow for upstate NY and MI, and even more rain/mountain snow for the West Coast.

Welcome to the Tuesday 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.

Arctic Blast to Freeze Eastern US:

  1. Current upper air patterns will promote the flow of sub-freezing arctic air from Canada straight into the Eastern US this week. Temperatures are expected to plummet below freezing as far south as Florida until the end of the week.
  2. For the Northeast, the bitter cold felt this morning will be followed tonight by the coldest temperatures of the week, with nighttime lows likely unable to get out of the single digits. Snow melt from this weekend’s snow event could cause black ice to form overnight, especially on untreated roads and walkways.
  3. Further south, the worst of the cold will be felt early this morning, followed by a very gradual warm up back to temperatures in the 50s by Friday. Still, these anomalously cold temperatures reaching this far south just weeks before the start of Spring is something to marvel at.

Heavy Lake-Effect Snow Mid-Week:

  1. With bitter Arctic winds blowing over the Great Lakes, it can only be expected that lake-effect snow follows. Until Thursday, many parts of Upstate NY and MI remain under Winter Weather Advisories due to heavy lake-effect snow that will likely drop nearly a foot downwind from Lakes Ontario, Erie, and Michigan.
  2. The heaviest snowfall will be downwind of Lake Ontario for parts of Upstate NY through Thursday. Totals along the lake shore are expected to reach over a foot, with narrow bands of very heavy snow likely to severely (and quickly) reduce visibility.
  3. Snowfall downwind of Lakes Erie and Michigan will be less intense, with totals reaching up to 6″, and snowfall bands slightly weaker, and more infrequent.
  4. Lake-effect snow in these regions will finally come to an end Thursday morning as temperatures across the region begin to warm back up to average.

West Coast Atmospheric River to Cause Heavy Rain and Snow:

  1. Another week, another high-impact atmospheric river for the West Coast. This has been a very active season, bringing most of California out of a drought. On the downside though, heavy rain and mountain snow continues to cause problems as flooding, reduced visibility, and blowing snow impede travel across the Pacific Northwest this week.
  2. At high elevations through the Sierras, more heavy snowfall can be expected to cause major slowdowns and closures on parts of I-5. Up to 3 feet of snow falling until Thursday will mean serious problem for vehicles traveling without chains and proper caution.
  3. Heavy rainfall across the Northern and Central Californian coasts can be expected through Thursday as well. Up to 5″ can be expected in the foothills, with possible thunderstorms increasing local totals. Even minor road flooding could impact travel, especially in and out of cities like Sacramento.

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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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