As Tropical Storm Isaias threatens to become a weak hurricane when it hit the Carolinas on Monday night, questions remain about what is expected when it eventually reaches Pennsylvania.
According to the most recent projections from the National Hurricane Center, the bulk of the storm is expected to hit the easternmost part of the state on Tuesday afternoon. Rain is expected to be in the area from Monday night through Tuesday.
And while the eye of the storm is projected to only hit the easternmost counties, heavy rain is expected throughout the entire eastern half of the state.
According to National Weather Service Meteorologist Rachel Gutierrez, the biggest threat to the state is heavy rain and some wind.
Philadelphia could see between 4-5 inches of rain in a day, while Harrisburg is looking at 2 inches, Gutierrez said. West of Harrisburg, only a half an inch is expected from the middle of the state on.
In Philadelphia, wind gusts up to 58 mph could be seen but wind speeds lower to gusts around 17 mph in Harrisburg, Gutierrez said. Lancaster could still see some more intense gusts, up to 30 mph.
While these aren’t record-breaking rains, two very dry months leading up to this storm have left much of central Pa. in drought conditions.
Harrisburg had the driest July since 2002, Gutierrez said, and along with a dry June and regular heatwaves, the ground is primed for flood conditions.
“If the soil is too dry and a lot of rain comes down at one time, the soil is not able to absorb all the moisture,” Gutierrez said. This will lead to roads flooding and local bodies of water swelling.
Flash flood watches are in effect for most of central and eastern Pa. Gutierrez said it is good that many areas will see rain for the first time in a long time, but especially in the easternmost counties more severe flooding is expected.
In central Pa. Swatara Creek in Hershey and the Conestoga River in Lancaster are expected to at least reach their action stages, Gutierrez said. The action stage is the point just before a body of water floods. The action stage for Swatara Creek is 6 feet at the spot near Hershey, while the flood stage, when it begins overflowing is 7 feet.
When Isaias continues north, Pennsylvania will get a few days off from the rain. Gutierrez said Wednesday and Thursday should be dry, then some more normal afternoon thunderstorms could come through starting Friday.
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What will Tropical Storm Isaias bring to Pa.? - PennLive
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