Friday 9 a.m.
Warm and humid conditions will prevail in the Middle Atlantic states through the weekend. From central New York state through much of New England, there is some uncertainty because of a very slow-moving front separating the summery air to the south from slightly cooler air to the north. As warm and humid air glides up and over the cooler air, clouds and spotty showers and thunderstorms can occur. This radar picture from 8 a.m. shows we are not just talking about light sprinkles!
In the video, we look at how the weather should evolve during the weekend and early next week.
In forecasting the future movement of tropical storms and hurricanes, a variety of computer models are run. The map below shows the tracks predicted by this plethora of models. While each track would produce a unique outcome (in terms of details), most are pointing to the possibility of a batch of heavy rain coming right up through the Middle and North Atlantic states early next week. AccuWeather.com will have stories and videos about the storm all weekend. Even if the tropical system moves away, a cold front from the west will have its own supply of showers and thunderstorms.
This map shows a projection from last night's European model. It shows an huge temperature difference in a short distance across northern and central New England.
A number of you have submitted weather photos and graphics that we really enjoy. One person with a keen eye for how to visualize weather and climate events is Ralph Fato of Connecticut, who graciously allowed me to use this graphic about snowfall.
Snowfall amounts yesterday were low from Philadelphia to New York City. Accumulations increased toward the north and northeast.
This map shows the NAM's projection for this Friday night. The isobaric pattern suggests there is a southwesterly flow of mild air from the Gulf states to the Middle Atlantic region. Farther north, we see evidence of the frontal boundary that separates the mild air from chillier air.
A new area of snow now over southern Minnesota should expand southeastward to reach Chicago this afternoon, streak to Pittsburgh this evening, then reach the Philadelphia/New York City area late tonight or early tomorrow morning. This map shows a low pressure area over Missouri.
This map shows expected accumulations.