Tuesday 8 a.m.
This video includes a forecast for the balance of this week.
The Chicago video addresses several chances for showers this week.
This upper-air forecast for Oct. 29 shows a flow pattern that suggests November-like chill for the Great Lakes and Northeast.
With air originating well north in Canada passing across the still warm Great Lakes, snow showers can break out downwind from the Great Lakes into the mountains.
Most computer models suggest the most concentrated rainfall will be over central and eastern Pennsylvania, New Jersey, Delaware, Maryland and northern Virginia tomorrow.
The cold front is accompanied and preceded by a band of showers, some heavy. As the front continues SE today, some thunderstorms should develop.
Yesterday, there was a sharp boundary between air that was cool and dry enough to suppress thunderstorms and air that was warm and humid enough to support them. This map shows the lightning strikes from 8 a.m. ET yesterday to (almost) the same time today.
As the second low pressure area develops off the East coast, it will work in concert with a high pressure area from Canada to orchestrate cooler-than-usual conditions with showers in the Middle and North Atlantic states Thursday.
Looking ahead to <strong>next</strong> weekend, the Mothers Day Weekend, we see quite a difference between the GFS model and European models on where cold Canadian air is heading at 2 a.m. Sunday.
Rain is spreading across the Middle Atlantic states today. Dampness will linger from southern New York state to Virginia tomorrow even as the main rain area moves offshore.