Unsettled weather will likely continue well into the start of next week, starting with today. As storms and rain bring a brief cool-down to the Northeast this weekend, an upper-level system brings the possibility for some late-season snow to the Great Lakes.

Welcome to the Friday 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.

Severe Weather and Excessive Rainfall Risk Today:

  1. A cold front will sweep across the East coast today, bringing a soggy start to the weekend. In many areas along the coast, some thunderstorms will also develop, with a few of them even becoming severe.
  2. Rain and storms moved into the region overnight, and will continue throughout the day. By tomorrow, 1-2″ of rain will have fallen over the Northeast, with locally higher amounts possible from developing severe weather. The highest rainfall totals will be in New England, where some ongoing river flooding could be exacerbated by today’s rains.
  3. As we go into the afternoon, temperatures will warm into the 60s and 70s, allowing more buoyant and moist air to lift over the Mid-Atlantic, and stronger thunderstorms to develop. Over this highlighted region, some storms are expected to become severe, with rotation, hail, and damaging straight-line winds all possible.
  4. The biggest threats with these storms today will be straight-line winds, and a few possible tornadoes, especially over SE Pennsylvania and the DelMarVa. Flash flooding is also a possibility, especially for urban and flood-prone areas, due to likely heavy rain within storms.
  5. The strongest storms are expected to begin in the late afternoon and continue through rush hour into the evening.

Late-Season Upper Great Lakes Snowfall:

  1. As one low pressure system moves off the coast to the east, another one sets up to the west, just over the Rockies. This system will track across the Northern Plains, Upper Midwest, and Great Lakes this weekend, bringing with it the risk for some late-season snow!
  2. With limited moisture over the Central US, the heaviest precipitation is expected to be to the north, within the comma-head of the storm. A few thunderstorms, some strong, may develop as well over the Dakotas with this storm’s passage. Any thunder and lightning would accompany the heavy rainfall the region can expect tonight into Saturday morning.
  3. Moving further east, the northern edge of this system will hit some cooler temperature profiles over the Upper Midwest/Great Lakes. Right now, there’s a strong signal for some snow over parts of Southern WI and MI. However, there is still some significant uncertainty on the exact axis of highest precipitation.
  4. Where/if snow does fall, it will be wet and heavy, but likely not long-lasting. Warmer temperatures will quickly melt any accumulations, leaving only some minor flooding and a muddy mess.

Brief Cool-Down Going into Next Week:

  1. As two synoptic features move through the region this weekend, temperatures will cool each day, with nightly lows dipping down into the lower 40s and even 30s by Sunday.
  2. Tonight, our first frontal system will move off the coast, bringing in some cooler temperatures with it, especially to the north. Between Friday and Saturday nights, we’ll see around a 10 degree difference in low temps due to this passing cold front.
  3. Another significant cool-down will happen Sunday, as our second synoptic system of the weekend makes its way through. While thunderstorms and severe weather won’t make headlines until later next week, temperatures will continue to cool into the start of the week.
  4. For parts of Upstate NY and New England, temperatures will dip down below freezing Sunday and Monday nights, with some frost advisories likely to come.

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Author

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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