A low pressure area moving quickly northeastward from the Gulf states will be east of New York City by midday tomorrow and out past Nova Scotia on Thursday. It is likely to bring rainy, drizzle and at times foggy weather to the I95 corridor from DC to New York City, with wet snow more likely as it gets to Boston. In a 50 mile wide zone from northwest to southeast, it may be possible to find results ranging from 4 or 5 inches of snow at one end to more than half an inch of rain at the other. And, even where temperatures are below freezing at the ground, there may be enough warm air aloft to create a sleet or freezing rain situation instead of snow. Here is a projection for snow that was made early this morning:
This video show the rest of the forecast through early next week. I also decided to throw in a wild looking map for January 27th. The only thing I am sure about here is that this outlook will change as we get closer to that date!
This map shows the GFS forecast for Monday at 2 p.m. ET. If correct, rain will hold off for the Boston Marathon. However, you can see that any speedup of the rain would prove that idea to be wrong.
Another high pressure area will build over the Northeast during the weekend, so sunshine with mild afternoons can be expected. However, this forecast map for next Monday evening shows how extensive and wide ranging the next storm may be.
These maps show how the US model handles the disturbance now causing rain in Tennessee. On the 1st map (for tomorrow), it is embedded in a southwesterly flow. However the 2nd map (for late tomorrow night) shows it turning more toward the course that would take it out to sea.
In the middle of Pennsylvania, rain ended before daybreak, but rolls of sullen clouds presided during the first hours of daylight. A robin takes in the scene.
... map shows this morning's surface pressure pattern, including a southerly flow of warm air in the East and a northwesterly flow of cooler air behind a cold front that is drawn in blue. Showers accompany and precede the cold front marking the boundary between the two air masses.
Rainfall between today and Friday night will be highly variable between the Midwest and East Coast. Parts of the Ohio Valley, where it has been wet recently, will get more heavy rain; places along the East Coast will generally get less. From New York City to D.C., this weekend may be the nicest so far this year!