Warmth and humidity will continue to build over the mid-Atlantic and much of New England Sunday just in time for the official summer season.
Summer officially began at 1:04 a.m. EDT Friday, June 21.
Typical summertime warmth combined with humidity started to build into most areas Saturday. For some areas, this will become the second heat wave since late May.
Daytime highs will range from the middle 80s to near 90 degrees along the I-95 corridor from Washington, D.C., to Philadelphia, New York City, Hartford and Boston and well into the 80s in the Appalachians to Pittsburgh and Buffalo both days this weekend and on into Wednesday of next week
The Sunday night will be rather warm and sticky.
Some folks accustomed to leaving their windows open during the cool nights much of the spring may have their air conditioners running around the clock this weekend into much of next week.
Most of the time through Wednesday will be rain-free, a change from the first part of the month. However, the uptick in heat and humidity and weak disturbances from Sunday on will lead to widely separated thunderstorms on an almost daily basis with some day-to-day differences in location. Most of the thunderstorm activity will occur between 3:00 and 9:00 p.m.
The only exception to the spotty thunderstorm regime will be from northern upstate New York to northern New England, where rounds of thunderstorms from the Midwest will arrive and continue.
Folks heading to the Firefly Music Festival at Dover, Del., the Great Tastes of Pennsylvania at Lake Harmony, the Pooch-A-Palooza at Canton, Mass., or just heading to a ball game will want to don sunglasses and be prepared for the warmth. Wear lightweight, light-colored clothing, remember to use sunscreen and drink plenty of fluids.
Water temperatures are cool along the Atlantic coast, ranging from near 70 in Virginia to 60 in New Jersey to 56 in Massachusetts.
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While waves of arctic air will continue to pour across the Great Lakes and New England this weekend, milder air will surge farther northward early next week.
The cold reprieve unfolding across the United States will not last long with waves of chilly air set to invade many parts of the country in the days leading up to Christmas.
Urduja, known globally as Kai-tak, will continue to unleash life-threatening flooding rain and mudslides as it slowly crosses the Philippines into Monday.
Winds will again kick up and become strong, raising the risk of rapidly spreading wildfires in Southern California through Sunday as firefighters continue to battle the historic Thomas Fire.
After an unseasonably quiet start to December in the northwestern United States, a significant storm will set its sights on the region spanning Tuesday to Wednesday.
Southern Vietnam and the Malay Peninsula are being put on alert for potential impacts from Tropical Storm Kai-tak later next week after it finishes lashing the Philippines.
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