This video discusses how a cold front moving through the Northeast will cause strong thunderstorms. It has information about Arthur. But please: since this report is typically a one-time product each day, I urge you to check our news and tropical sections, where frequent updates, pictures and videos will give you the latest on Arthur and other weather related issues.
This map, which is updated frequently, showed our track forecast and main impact notes as of 10 a.m. ET.
you can see clear skies out ahead of the cold front that is causing showers and thunderstorms from Michigan to Missouri. The resulting heating will add fuel for developing thunderstorms ahead of the front this afternoon. The National Weather Service Storm Prediction Center highlights this in its outlook
While the Northeast and Great Lakes regions had fine weather much of the Fourth of July weekend, thunderstorms were very common in other parts of the country. This map shows lightning strokes from 7 a.m. ET yesterday until 6 a.m. ET today:
Over the Ohio Valley, rain is starting nudge northward again, prodded by one of a series of upper air disturbances embedded in the flow. It appears the rain will advance across Pennsylvania overnight, reach the area from New York City to Boston tomorrow... then head out to sea.
Farther north, the area from Chicago to Boston looks most likely to have sunshine and dry weather. Cloud cover will vary during the weekend, and I focus on that aspect of the weekend forecast in this video.
A band of heavy rain and locally violent thunderstorms moved from the New York City area at 4 a.m. to just past Boston (distance: 188 miles) by 9:30 this morning. Note the stunning contrast between where it is pouring (dark red) and where it has dried out.
On the map, showers and thunderstorms were located along and ahead of the gray line that cuts through Pennsylvania and along/ahead of the blue line. Both should be off the East coast by Thursday. Drier air from the Upper Midwest should filter into the Northeast later in the week.