It says September on the calendar, but it certainly doesn't feel like meteorological fall. Temperatures have started out well above average for the first few days of the month, but big time changes are on the way!
A strong cold front is currently moving through the Midwest. Ahead of the front, very hot and humid conditions exist. Behind the front, much cooler and drier air.
Strong storms have been firing up along the front all day. Tomorrow, as the front approaches the east coast, scattered strong and severe thunderstorms will develop. It'll feel like summer tomorrow afternoon with highs back into the lower 90s, but feeling like the upper 90s with very high humidity. The heat and humidity, combined with the approaching front, will trigger strong to possibly severe thunderstorms. The greatest threat from the storms will be damaging winds. As far as the timing, storms could pop anytime after 2pm. Here's one simulation at 2pm showing a few storms firing up.
- WeatherBell - NAM 2pm
A few other simulations suggest the storms will arrive after 6pm. Check out our in-house computer model that shows widely scattered showers and storms around at 9pm.
Since it will be so hot and humid, you'll want to keep an eye to the sky for ominous looking clouds. Storms could fire up at any time. If you're planning on being outdoors, make sure you have the StormWatch weather app downloaded to your phone for radar updates, as well as dangerous storm warning alerts based on your location. The greatest risk for storms will be between 2pm and 10pm Saturday.
The rain should wrap up overnight Saturday from NW to SE, as the drier air slowly filters in. Humidity levels will be noticeably lower Sunday with highs around 80 degrees. Check out a comparison of dewpoint temperatures (measure of humidity/moisture) Saturday and Sunday.
- WeatherBell - EURO 2pm Saturday dewpoint temperature
- WEatherBell - EURO 2pm Sunday dewpoint temperature
Saturday afternoon dewpoints will be in the lower 70s compared to upper 40 lower 50 degree dewpoint temperatures by Sunday afternoon.
The front will stall off the coast Sunday and will keep temperatures slightly below average for the early part of next week. We'll have to watch the front closely because an area of low pressure may develop along the front and could bring a few showers by Tuesday. It's still too early to tell, but one thing is certain -- cooler and drier, more September-like, weather will return by the end of the weekend!