As we head into the middle of our week, we’ll begin to see the effects of our overall pattern change. Temperatures will warm and skies will slowly clear in the East today and tomorrow. On the West Coast, a new potent storm comes ashore, which will then provide some energy for a multi-day severe weather threat over the Central US.

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.

Northeast Warm Up:

  1. Spring will make a comeback in the Northeast through the end of the week, as temperatures warm back up today and tomorrow. We will finally begin to see the effects of our overall pattern change.
  2. As higher pressure moves in aloft, skies will clear, temperatures will rise, and the water-logged region will begin to dry up after at least 5 consecutive days of rain.
  3. Temperatures will soar today, from the low 40s back up into the 60s and even low 70s for parts of the Mid-Atlantic. Continuously clearing skies will help to warm the region as the sun peeks through for the first time in days.

New West Coast Storm Comes Ashore Today:

  1. As a potent storm moves onshore later today, Northern and Central California will see heavy rain and even some late-season mountain snow through early Friday morning.
  2. While it is late in the season, snow in May over the Sierra Nevada is not too uncommon. According to the NWS, the average date of the last snow over the region is usually May 8th. So, while it is a little late to be seeing snow later in the month, it’s nothing too unusual.
  3. While higher elevations could see up to 2′ of snow, most surrounding regions will instead see heavy rainfall today into tomorrow. Road and passage closures through the mountains are likely, especially overnight tonight and tomorrow.

Multi-Day Severe Threat This Weekend:

  1. As our upper-air pattern settles into a configuration similar to last week’s, conditions will be highly favorable for a widespread severe weather threat over the Central US starting Friday, and likely spanning the weekend.
  2. An amplifying trough aloft will contribute to the development of a surface low coming out of the Rockies late Thursday/early Friday. As air masses collide, several frontal boundaries will form, including a potent dryline that stretches across Western NE and down into the TX panhandle.
  3. On Friday, the strongest storms are not likely to form until late afternoon/early evening. Storms may become linear, forming a squall line. However, discrete super cells are equally as likely, with all modes of severe weather possible. This means that large hail, very strong winds, and tornadoes are all possible along these boundaries Friday evening.
  4. This severe threat is expected to last through the weekend, with many storms lasting overnight into Saturday morning. Daytime heating will re-strengthen storms, with the possibility for hail, winds, and tornadoes still possible. A similar story exists for Sunday, as of now.
  5. A new perturbation in our trough aloft will likely bring severe threats into Monday and Tuesday as well, but at this time, details are not as well known. We will continue to update on this story as it develops further.

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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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