Inches of Rain to Flood Areas Along I-95 Corridor
By By Brett Rathbun, AccuWeather.com Meteorologist
September 12, 2015, 5:54:43 PM EDT
Rounds of showers and thunderstorms could be heavy enough to bring flooding across the I-95 corridor through Thursday evening, before erasing the summer heat.
As this strong front crosses the Northeast, cooler air will filter in, but not before bringing drenching rain and thunderstorms.
"The moist atmosphere could produce as much as 1 to 3 inches in just a short period of time," AccuWeather Senior Meteorologist Henry Margusity said. "The heaviest rain could fall between Philadelphia and New York City just in time for the evening rush-hour."
Total rainfall amounts from northern Delaware and central Pennsylvania into the Hudson Valley could surpass 4 inches by the time the system retreats.
Drivers are urged to slow down if caught in a heavy downpour to avoid the risk of hydroplaning. Use your flashers to alert drivers of dangerous road conditions.
Additionally, this rain could lead to baseball game delays or postponements in New York City, Philadelphia, Pittsburgh and even Atlanta. Those heading to any baseball games hoping for the game to be played should bring along raincoats and umbrellas in case rain moves in.
The same could be true for the NFL season opener in Foxborough Thursday night, as the New England Patriots host the Pittsburgh Steelers.
"There is huge contrast between the extreme summer weather we have had, versus the autumnlike air settling in for the end of the week," Margusity said. The clash of air masses will help to fuel the excessive rain amounts.
Use AccuWeather Minutecast® to get a minute-by-minute precipitation forecast for your area.
"While the wet weather will disrupt outdoor activities and there can be incidents of flash flooding, lawns and crops will get a welcome soaking where rainfall has been lacking recently," AccuWeather Senior Meteorologist Kristina Pydynowski said.
Much of the Northeast will return to drier weather on Friday; however, rain will continue across New England, mainly early in the day.
A second storm system moves in over the weekend, finally ushering in much cooler air. Temperatures will drop between 15-20 degrees Fahrenheit from earlier this week.
Record high temperatures were broken across a large portion of the Northeast on Tuesday and Wednesday as a very warm, humid air mass built over the region.
New York City's Central Park reached 97 F on Tuesday, making it the hottest day in September in 32 years (97 F on Sept. 10, 1983, and 99 F on Sept. 11, 1983).
Boston rose to 96 F on Tuesday before a developing sea breeze cooled the city to near 80 F for the rest of the afternoon. This broke the previous record high of 95 F back in 2007. It was also the warmest Boston has been since it was 97 F on Sept. 11, 2013.
The showers and thunderstorms Thursday and again on Saturday will help to erase the summer heat, perhaps for good.
"The ridge in the jet stream responsible for the warm start to September in the East will finally break down late in the week, which will allow cooler, less humid air to move in for the upcoming weekend," AccuWeather Meteorologist Brian Thompson said.
The temperatures that soared into the 90s along the I-95 corridor earlier in the week will be replaced by highs in the 70s by the end of the weekend. Parts of the interior Northeast, including Pittsburgh, Pennsylvania; Buffalo, New York; and Morgantown, West Virginia; will rise into only the 60s for the weekend.
Despite the large drop in temperatures by this weekend, temperatures will be near normal for the middle of September.
Average high temperatures across the Northeast are typically in the 70s by the middle of September.
Those that love the summer heat may wonder if the 90-degree heat is over for the rest of the year as we approach the first day of autumn.
According to AccuWeather Long Range Meteorologist Paul Pastelok, "Temperatures across the East look to hold near to just above normal through the rest of September."
"There could be a surge of warmth across the East ahead of any cold fronts into October," Pastelok added.
Whether any upcoming surges will lead to temperatures reaching the 90s is yet to be determined.
According to AccuWeather Meteorologist Evan Duffey, "With the pattern currently set the way it is, there should still be some opportunities for well above-normal heat into October."
Meteorologist Courtney Spamer contributed content to this story.
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