A late-week storm will give way to a rather quiet weekend for the nation overall before a burst of extreme cold moves into a large portion of the US next week.
Welcome to the Thursday 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.
New Storm Brings Heavy Rain and Snow to East Coast:
- Low pressure over the Midwest will intensify as it moves over the Great Lakes and subsequently into southeastern Canada through late-week, bringing a round of heavy rain to much of the Eastern Seaboard while snow affects parts of the Midwest and Northeast.
- Rain will changeover to snow across the Ohio River Valley and interior portions of the Northeast, with up to half a foot of accumulation expected.
- A widespread 0.5-1.5 inches of rainfall is forecast for the East Coast, but locally higher amounts will be possible. Some flash flooding will also be possible on top of the snow cover in the Northeast.
- The cold front driving this rain and snow will not fully clear through South Florida, keeping the region unsettled through early-next week.
Read more here.
Weekend Lake-Effect Snow:
- Cold air behind our late-week storm will move over the Great Lakes, aiding in the development of lake-effect snow Friday into Saturday.
- All five Great Lakes are expected to produce snow, with the highest amounts east of Lakes Erie and Ontario. Over half a foot of snowfall will be possible in localized areas.
- A new disturbance will move into the region Sunday, ending the lake-effect snow but beginning the synoptic-scale, light snow. A couple inches of additional snow will be possible.
Arctic Outbreak Next Week:
- A round of well below average temperatures will move into much of the eastern US this weekend, with temperatures generally 10-20 degrees below normal.
- A more significant round of cold air, which may be long-lasting, will arrive mid-next week associated with the Polar Vortex. Some of the coldest air of the season will be possible across the eastern two-thirds of the nation.
- Widespread temperatures 20-40 degrees below average may be possible, but the magnitude of this cold is yet to be fully determined.
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