Monday 10:30 AM
This video discusses the weather pattern affecting the Northeast and Great Lakes this week. A cold front moving into the eastern Great Lakes will trigger thunderstorms and showers as it continues eastward and slowly weakens. A high pressure area behind the front will usher drier air into the region tomorrow and Wednesday. Hotter air is getting ready to move out across the northern Plains and then will affect the Great Lakes and Northeast. Chicago had 90-plus heat Thursday through Saturday, but the new round of hot air could be stronger and last longer.
The role of Isaac in the Great Lakes and Northeast is yet unknown. Once the storm moves inland and no longer has strong winds, it will continue as a tropical rainstorm (a named storm from the tropics that can cause major flooding (like Lee last year) but no longer qualifies as a tropical cyclone on the basis of wind.
In addition to the frontal showers and thunderstorms, there has been a band of thunderstorms this morning from parts of eastern Maryland and Delaware north-northeastward into New Jersey. Here is where it was as of 10:30 AM:
An active storm and frontal system moving eastward through the Great Lakes today will reach the Northeast Thursday.
A large high pressure area centered over Hudson Bay but extending south all the way to the Gulf states is creating northwesterly flow of chilly air for all of the Northeast.
On the map, one band of rain is along the coast at the north edge of the picture, the second is entering the Sierra range straight east of San Francisco, and the third extends from Los Angeles northeast to Las Vegas and on from there.
Some bands of rain broke out in the I-95 corridor, the most important of which brought a batch of heavy rain to the New York City area between 8:30 and 10 a.m.
in response to the approach of a deepening trough from the Plains, a Midwest low pressure area will grow stronger as it moves east to arrive on the New England coast Saturday morning.
In the I-95 corridor from D.C. to NYC, temperatures will be up past 80 this afternoon. However, between now and Saturday, a major change is on he way.