Monday 8 AM
A large high pressure area moving eastward from the Midwest is likely to control Northeast weather all week. Today started cool throughout the region, with many rural spots from Michigan to Maine experiencing temperatures well down in the 40s.
At Pellston, Mich., the temperature dropped to 35, and it was below 32 degrees with wind gusts greater than 40 mph on top of Mount Washington in New Hampshire. However, that location is 6,267 feet above sea level, and their average low temperature at this time of year is around 38. The average high temperature is at or below the freezing point from Halloween until April 22!
The video shows the current setup, reviews the lightning record since Friday, and shows what should happen between now and next weekend. Frost is a possibility for tomorrow morning for outlying low spots in northern New York and northern New England.
When cumulus clouds encounter dry air almost as soon as they form, they are unable to grow. They present a benign appearance as they drift across the blue sky. In the Latin naming scheme for clouds, they are called cumulus humilis (you can see where the English words humble and humility came from, I think). I sometimes think of them as cumulus innocuous.
More than 110,000 lightning strikes occurred in the northeast third of the nation in the 24 hours ending at 11 a.m. EDT today (June 13).
This map shows the low pressure at the western edge. The isobars help define the location of the frontal boundary between the hot and cool air masses.
This map shows the area that could have damaging thunderstorms tomorrow and tomorrow night.
The Northeast regional radar at 10 AM showed a large area affected by showers and thunderstorms:
Whereas Andrea was centered in eastern South Carolina at 8 a.m., this satellite water vapor image shows the greatest concentration of moisture is well northeast of the surface circulation center
Quite a few models are in use, and this map shows there is widespread agreement on where the center of this storm is going.