Heavy rain to move through the Northeast Thursday
1. A storm that brought excessive rain to parts of the Southeast, including more than 8 inches of rain in just two days at Savannah, Georgia, is moving to the northeast. It appears that a pulse of heavy rain will move through parts of Pennsylvania later tonight, move through New York City tomorrow morning, then drench eastern New England tomorrow night into Friday morning. All of this will happen as an upper-air trough sharpens and strengthens as it moves from the Midwest into the Northeast.
2, The strong trough should weaken as it slows down in New England, and some drying should then spread from the Great Lakes into the Middle and North Atlantic states for Saturday. Saturday may be the nicest day of the three-day weekend.
3, Most computer models suggest another trough from the northwest will strengthen as it moves through the Great Lakes then into the Northeast later in the Memorial Day weekend. It is too early to predict the weather details this system will create, but it appears at least some showers and thunderstorms will affect transportation and holiday even plans Sunday and Monday.
These maps show (a) this pressure pattern this morning, (b) the distribution of clouds, rain and thunderstorms around the nation this morning and (c) the NAM model view of the weather map tomorrow.
Moisture has been flowing into the storm from the Gulf of Mexico, and there will be a significant contribution from the Atlantic as a high pressure area moves off the New England coast and the storm system heads northeastward. The front extending from the low pressure area over the Ohio Valley to Lake Erie was the focus for development of some showers and thunderstorms during this (Wednesday) morning.
Clouds associated with the eastern storm extended all the way from Wisconsin to Florida. As the cool front coming around the south side of then storm moves along, it will bring some parched parts of the Florida their most meaningful rain in weeks. However, the thunderstorms involved can include tornadoes and street-flooding rain.
This map for Thursday at 8 a.m. ET shows pockets of heavy rain that the storm should have produced in the previous six hours. The storm will affect New England next.
Video:
High pressure areas should dominate Northeast weather for the next several days, but storms will follow.
Some of this summer's AccuWeather interns can be seen watching today's production. We are fortunate to have a bright group.
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