Wednesday 9 a.m.
Today's video shows an upper-air disturbance that could trigger snow showers east or the Appalachians tonight (snow showers can occur any time downwind from the lakes into the mountains). We also look at a Friday-Friday night low pressure system that seems likely to drop light snow over a large area but which may be too disorganized to dump a lot of snow on any one place.
After that storm moves out to sea, it is likely to be blustery in the I95 corridor. However, as the flow aloft changes from northwest to west or southwest early next week, temperatures will moderate.
Lake-effect snow brought heavy accumulations downwind from lakes Erie and Ontario. This National Weather Service map shows amounts in inches for various points.
A deck of clouds about a half-mile overhead spread westward from the Atlantic to much of the I95 corridor from DC to Boston early this morning. These cloud decks can be a forecaster's nightmare in the spring because ...
The map below the video is one of the GFS solutions for where the southeast storm will be early Saturday. The precipitation is predicted to be farther north than suggested by other models.
It is freezing cold in the Northeast this morning, but this map shows that much more mellow mildness has reached the Plains.
Extensive precipitation straddles both sides of the cold front that was moving through central New York and central Pennsylvania as of mid morning. This radar shows the distribution of rain and snow; some temperatures are added.
The cold front approaching the East shows up quite well in this pressure analysis. Several temperatures are plotted to give you a sense for how much the temperature changes behind the cold front. At Chicago, it went from 60 at 4 a.m. to 39 at 5:19, a 21-degree drop in little more than an hour.
Temperatures on Sunday and Monday will range from the 60s in parts of New England to near 80 in Maryland and Virginia. However, a strong cold front will then trigger and perhaps a few thunderstorms as it ushers in air that will be 30-40 degrees colder than it will be ahead of the cold front.