Midweek mugginess and gusty storms later Wednesday | Weather | wfmz.com - WFMZ Allentown

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SHORT TERM FORECAST

WEDNESDAY: Partly sunny and breezy; warm and humid with a late day thunderstorm. High: 86

WEDNESDAY NIGHT: Mostly cloudy and sticky with a gusty shower or thunderstorm, mainly in the evening. Low: 66

THURSDAY: Mostly cloudy and not as warm but still humid. Lingering shower or storm possible. High: 78, Low: 66

  

FORECAST SUMMARY

After a nice break from the wet weather Tuesday, we'll get back to a stormy pattern today. As a cold front slides through later Wednesday into Thursday, not only will it bring another round of showers and storms focused on Wednesday evening, but also help to clear out the smoke.

There lies some uncertainty in the long range forecast later this week as we will be watching a coastal low develop offshore. Exactly how close to the coast it travels will determine rain chances, cloud cover and beach impacts Friday and possibly into the weekend.

For now, we'll leave a low chance for a shower or storm in the forecast for Friday and keep the weekend mostly dry, but stay tuned in the days ahead as we fine tune.

DETAILED FORECAST

WEDNESDAY AND THURSDAY

A cold front will slide through later Wednesday and Wednesday night, providing our best chance of a shower or thunderstorm for the next several days.

However, most of the day Wednesday will remain rather dry until later in the afternoon when the front will approach eastern PA. There is also a risk for severe storms during that timeframe with the main threats being damaging wind gusts, hail, heavy rain and lightning.

The best chance for severe storms will be Wednesday evening, especially north and west of the Lehigh Valley as storms should weaken Wednesday night as they come south and east. So, the areas hit hardest Monday night will be the most likely to see severe weather Wednesday evening as well.

A south to southwest wind flow ahead of the front should help lead to highs in the mid to upper 80s with heat index values around or above 90 degrees.

There may be a few lingering showers early Thursday before skies start to break up by the afternoon. Behind the front, we'll get some relief temperature-wise as highs dial back to the upper 70s. However, the summery humidity isn't going anywhere anytime soon.

FRIDAY INTO THE WEEKEND

We'll then watch some moisture that will try to sneak up the East Coast in association with a coastal low pressure system on Friday and Saturday, but much uncertainty remains with regards to just how strong this low ends up being, and just how close to the coast it ends up being as well.

For now, we’ll be more optimistic and call for some sun Friday and Saturday with just a slight chance of a stray shower or thunderstorm and the low far enough off the coast to limit impacts. We'll keep a close eye on this in case it trends closer to the coast.

It looks warm and humid, unseasonably so for mid-September, right through the weekend and perhaps beyond.

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Midweek mugginess and gusty storms later Wednesday | Weather | wfmz.com - WFMZ Allentown
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