Storms Likely All Week As 'Unusual' Weather Pattern Returns To PA

Think this week's weather has to be better than last week's? Don't get your hopes up.

An unusual jet stream pattern that prompted widespread rain and storms across the Northeast last week returns, and could cause additional localized flooding issues in Pennsylvania, forecasters predict.

While we had a nice weekend of plenty of sunshine to dry out the rain-soaked roads and lawns, expect more wetness this week, when there is a chance of thunderstorms every day through at least Saturday.

The National Weather Service has issued a Hazardous Weather Outlook for the week, saying downpours Tuesday through Friday could be heavy enough to cause localized flooding.

AccuWeather reports that tropical moisture will once again surge northward between a slow-moving storm and a strong area of high pressure. "That will lead to sticky conditions and rounds of drenching showers and thunderstorms streaming from the south to the central Appalachians and the mid-Atlantic through most of the week," AccuWeather said in a news release.

The Weather Channel said the pattern is "unusual" for this time of year and will result in stormy weather for the East. "This week's weather pattern is somewhat similar to the one that fueled severe thunderstorms and heavy rainfall in portions of the South and East last week," The Weather Channel reports.

"A piece of energy riding through the jet stream will cause it to become amplified in a north-to-south fashion east of the Rockies early this week. In the summertime, the jet stream usually flows in a flatter west-to-east pattern near the Canadian border, so that's why this jet stream is unusual," according to the Weather Channel.

Residents in Pennsylvania, which was hit hard by flooding last week, should not let their guard down, AccuWeather warned. "There is the potential for heavy enough rain to renew flooding problems," the news release said.

While there is a chance of showers today, the heaviest rainfall is predicted mid week through the end of the week.

Here is the forecast:

Today: A chance of showers, mainly after 2pm. Mostly cloudy, with a high near 83. Southeast wind 5 to 7 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

Tonight: A chance of showers and thunderstorms, mainly after 1am. Patchy fog after 2am. Otherwise, mostly cloudy, with a low around 67. East wind 3 to 5 mph. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Tuesday: A chance of showers and thunderstorms. Patchy fog before 8am. Otherwise, mostly cloudy, with a high near 84. Light and variable wind becoming southeast 5 to 7 mph in the morning. Chance of precipitation is 50%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Tuesday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 73. South wind around 6 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Wednesday:A chance of showers and thunderstorms. Mostly cloudy, with a high near 87. Southwest wind 7 to 10 mph. Chance of precipitation is 50%. New rainfall amounts between a quarter and half of an inch possible.

Wednesday Night: A chance of showers and thunderstorms, mainly before 2am. Mostly cloudy, with a low around 74. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Thursday: A chance of showers and thunderstorms after 8am. Partly sunny, with a high near 86. Chance of precipitation is 50%.

Thursday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 71. Chance of precipitation is 40%.

Friday: A chance of showers and thunderstorms. Mostly cloudy, with a high near 85. Chance of precipitation is 50%.

Friday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 69. Chance of precipitation is 40%.

Saturday: A chance of showers and thunderstorms. Partly sunny, with a high near 86. Chance of precipitation is 30%.

Saturday Night: Mostly cloudy, with a low around 69.