The warmest weather since last autumn is in store for much of the East spanning Sunday and Monday and will feature 80-degree temperatures in some locations. The warmup may bring a surge in pollen as well.
After a winter and early spring where temperatures have averaged well below normal, it will feel like summertime for a day or two in much of the East.
Mild air in the Eastern states on Saturday was just a tease compared to the warmth that came Sunday and also what is to come Monday for many areas east of the Mississippi River.
The warmth is likely to reach all the way into northern New England and the Maritimes. Only locations with a southern exposure to chilly ocean, sound or bay waters will stay relatively cool.
For most areas in the mid-Atlantic, Sunday will be the warmer of the two days, as cloud cover and showers will begin to invade the region.
For much of New England, New Brunswick, Nova Scotia and Prince Edward Island, Monday will be the warmer of the two days, thanks to a stiff southwesterly wind.
Despite Monday's warmth, temperatures will stop short of record levels in most areas. For many locations, record highs this time of the year are well into the 80s and lower 90s.
The combination of mild air and recent rainfall helped to bring the cherry blossoms to peak around Washington, D.C., this weekend.
The surging warmth will allow more lawns to green up, blossoms to emerge and early spring flowers to bloom.
Along with the surging warmth will be an explosion of tree pollen in southern portions of the mid-Atlantic and in parts of the Ohio Valley.
To some extent, the south to southwesterly winds will allow some of the tree pollen to push northward for a time into areas where vegetation is still dormant.
The combination of tree pollen, mold, emerging grasses, old winter brush and other conditions could have some allergy sufferers running for cover.
However, these factors may not necessarily be the source of allergy symptoms for many people.
Despite the upcoming warm surge, this does not mean the end of unseasonable chill for portions of the Midwest and the East.
Another substantial dip in temperatures is in the forecast for much of the North Central states and the Northeast by midweek.
Marking the change from very warm conditions to chilly weather will be a front accompanied with showers, thunderstorms and severe weather early this week across the Deep South and Southeast.
A bit of wet snow is possible at the tail end of the rain at midweek in parts of the central and northern Appalachians.
Tropical Depression Eight could become a tropical storm while brushing the North Carolina coast with rough surf, downpours and locally gusty thunderstorms into midweek.
Tropical Depression Nine developed just south of Florida on Sunday and will turn toward the northeastern Gulf Coast of the United States later this week.
Two tropical systems, Madeline and Lester, could pose hazards to Hawaii from the middle of the week into Labor Day weekend.
Though the summer season is winding down, forecasters are predicting a warm start to fall across the Northeast — a weather pattern that could spell bad news for fall foliage lovers.
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