Conditions will favor the formation of fog from portions of Tennessee and North Carolina to New England during morning hours of the latter part of this week.
Diminishing wind, recent drenching rainfall and a clear sky over head will allow fog to form in the valleys again Friday morning in portions of the East and interior South.
While the fog is likely to stay away from most of the major I-95 cities in the mid-Atlantic and New England, folks flying out of secondary airports first thing in the mornings may experience delays. Also fog patches can appear in some of the suburbs.
This also means that visibility may be poor over stretches of interstate highways that pass through the valleys within the Appalachians, including I-40, I-64, I-70, I-77, I-79, I-80, I-81, I-83 and I-99.
Thursday morning, patchy dense valley fog reached from western North Carolina to Vermont and New Hampshire. Near-zero visibility occurred in Springfield, Vt.; Franklin, N.C., Middlesboro, Ky. and Marion, Va. Visibility was reduced to one-quarter mile over the broad Susquehanna Valley in central Pennsylvania. Freezing fog occurred in parts of upstate New York.
During Friday morning, fog may favor the eastern side of the Appalachians in portions of North Carolina, Virginia, central Maryland, central and eastern Pennsylvania and central and southeastern New York.
If you will be traveling within these areas, expect delays and allow extra time for your ventures.
In light wind situations, cool air tends to collect in the valleys. As this air cools, it becomes saturated under the right conditions.
Since the rivers are relatively warm this time of the year, they tend to release extra moisture into the local environment.
So far this year California has seen 1,569 wildfires, 85 percent more than in an average year.
The Memorial Day weekend will begin cool, windy and rainy in New England and part of the mid-Atlantic.
GOES-East failed again late Tuesday. It is one of the main satellites meteorologists use for the eastern part of the United States and the tropical Atlantic.
The tornado tore through a path 17 miles long on Monday and had wind speeds as high as 200 mph.
On the two-year anniversary of the EF-5 tornado that leveled Joplin, Mo., the town has deployed assistance to Moore, Okla.
The same system that spawned deadly tornadoes in Oklahoma will reach the Northeast on Thursday.
International Falls, MN (1992)
Late season snow flurries.
New Hampshire (1814)
Merrimac, Litchfield, Londonderry and North Chester, NH; Tornado and hailstones with 11-inch circumference weighing 1/2 pound.
More rain in an already wet month. Monthly totals topped 11 inches at New York City, 9 inches at Bridgeport, CT and 8 inches at Baltimore (all three records for May).