Wednesday 9 a.m.
Early this morning, some heavy showers and thunderstorms straddled I95 from Washington, D.C., to New York City. In some individual thunderstorms, the rain has been heavy enough to cause street flooding, and more episodes of that will take place today. This is part of the same disturbance that caused local flooding in Batavia, N.Y., yesterday and at other spots from central Pennsylvania through West Virginia and at places farther southwest.
Once the current shower zone moves offshore, hotter, humid air will drift east to send temperatures to or past 90 degrees for at least three consecutive days from D.C. to near New York City. Computer models show cool fronts reaching the Northeast late Sunday or Monday then again a few days later.
No tropical storms are targeting the Northeast at the moment, but the tropical Atlantic has come alive with several trackable features. You can read this morning's tropical weather feature here.
In today's video, we look at the period from today (Wednesday) through early next week.
After thunderstorms moves through in late afternoon clouds, the sky often clears. Around and just after sunset at ground level (but not yet at cloud height), the sunlight can illuminate the bottoms of clouds. This scene appeared west of my location in the middle of Pennsylvania last evening.
This map shows the pressure pattern around the big storm that some people in Boston and Providence are comparing with the Blizzard of '78.
In the worst-hit areas, plan for travel bans (for all non-emergency activities) because of impassable roads and extremely poor visibility. This map shows our projection for snow accumulations by early Wednesday. In many areas the heaviest snow should fall overnight and tomorrow morning.
In the worst-hit areas, plan for travel bans (for all non-emergency activities) because of impassable roads and extremely poor visibility. If you get stranded, rescue crews may not be able to reach you. Storms like this sometimes generate thunderstorms within the heaviest snow bands. The map shows predicted snow accumulations by early Wednesday.
It appears likely that many normal activities can go on through the day Monday, as long as the typical cautions for light to moderate snowfalls are observed. Tuesday will be an <strong>entirely different story</strong>. This map shows the GFS- predicted snowfall through 7 P.M. ET Monday:
The second storm we have been talking about will affect the Middle Atlantic region late Sunday and Sunday night. This GFS forecast map is for 7PM ET Sunday and shows precipitation amounts for the 6 hours up to that time.
This was our snow accumulation projection as of mid-morning. A storm that will develop in the Midwest on Sunday is likely to track to the Virginia-Maryland coastal area by Monday morning, then turn east. It will probably bring some to snow places that get mostly rain out out of the first storm.