Wednesday 8 a.m.
Today's video starts with the current cold that extends all the way to the Gulf coast, then travels though the warmup that will extend past the Canadian border.
A meteogram is a forecast that spans a number of days using a graphical format. Examining it reveals how the weather story will unfold. Today's meteogram is for Philadelphia, but other cities from D.C. to Boston can expect a similar sequence of events.
In the diagram, you see how the period starts cold but climbs to the 60s this weekend. The green wind barbs show a flow from the northwest initially, then the southwest winds that bring in milder air, then a strengthening southerly flow that will bring in moist air from the Gulf states. The only rain in the forecast is in association with the next cold front.
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.
For the rest of the week and this weekend, the upper-air "steering winds" will be arranged in two separate streams. The northern branch will send air from central Canada toward New England.
In the Northeast today, the low pressure area shown on this map will move to the East Coast today, pulling the front south as a cold front. Showers and gusty thunderstorm will affect areas south of the front while steady rain and gray skies are common to the north...
This map shows predicted temperatures for 2 p.m. ET today. This is about two hours before the daily high temperature is often reached. Note how close the chilly and warm air masses are to each other in the Northeast and eastern Canada.