Heaviest rain arriving overnight through Thursday morning

Forecast

Rain lingers through tomorrow evening, drying out by Friday...

TONIGHT: Heavy Rain, Breezy. Lo 64. Winds: SE 10-15 mph. Gusts to 25 mph.

THURSDAY: Heavy Rain, 1-3″ Totals, Breezy. Rain Exits 11AM-2PM. Hi 66. Winds: S 5-15 mph. Gusts to 25 mph.

FRIDAY: Sunny, Breezy. Hi 71. Winds: W 5-15 mph.

Showers developed throughout our Wednesday, but for the most part this activity had been scattered and off-and-on. Areas west of Harrisburg have seen as much as 0.75-1.0″ of rain, but east of Harrisburg there has been little to no rain adding up. This is a good trend heading into tonight as the heaviest rain arrives.

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The main action/heavy rain for Central PA occurs tonight and through Thursday. Heavy rain will set up shop west of Harrisburg overnight after midnight and continue spreading eastward through early Thursday morning. Bands of heavy rain will push slowly eastward through Thursday morning and it may take until 2 PM for the steadiest rain to clear our eastern counties. By then, 1-3″ of rain will have fallen for most locations, with locally higher amounts possible. Some flash flooding is possible in low-lying and poor drainage areas (also basements susceptible to higher ground water), especially given the wet conditions so far this month. A FLASH FLOOD WATCH has been issued through tomorrow evening. Some thunder is also possible within these heavy rain bands tomorrow as some moderate instability is expected too. **The greatest risk of flash flooding is likely west of Harrisburg where the heaviest rain during Wednesday fell. Areas farther to the east should have lower chances of seeing higher water levels due to lower rain totals Wednesday.

It will be breezy at times through this event with 10-20 mph winds continuing tonight and Thursday morning too. By sunset Thursday night, clouds will clear and temperatures will quickly drop into the 50s! The weather is literally transitioning to fall on this first day of autumn. Autumn began at 3:20pm Wednesday, by the way.

Behind the front, cool air settles in for the end of the week. Highs look to be locked into the lower 70s with overnight lows in the lower 50s. A secondary front could push through during the weekend, possibly bringing some clouds late Saturday and a reinforcing shot of cool air and breezy conditions for Sunday. Overall, it looks like another terrific weekend — the first weekend of fall!

-Meteorologist Dan Tomaso

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