Before more seasonable air returns, drenching thunderstorms threaten to put a damper on Labor Day outdoor plans in the Harrisburg, Lancaster and York areas.
With steamy air in place, showers and thunderstorms will rumble across the Harrisburg area through Labor Day ahead of an approaching cold front.
Downpours will accompany some of the thunderstorms, threatening to cause localized flash flooding.
All of the downpours will pose hazards to motorists by reducing visibility and heightening the risk of vehicles hydroplaning at highway speeds. Airline passengers may encounter delays and headaches.
Those with outdoor plans should prepare to move inside for a time or make indoor alternatives.
The good news is that there will still be rain-free intervals through Labor Day.
Residents and visitors should just stay alert for changing weather and seek shelter when storm-related warnings are issued or thunder is heard. For the latter, you are then close enough to get struck by lightning.
While lightning and downpours are the greatest concerns from the thunderstorms through Labor Day, an isolated number producing damaging winds and hail cannot be ruled out.
A couple of showers and thunderstorms will linger into Monday night before the cold front passes through and gives way to lowering humidity Tuesday.
Potent thunderstorms will target part of the Plains during a time when many will be outdoors celebrating Memorial Day into the evening hours.
Despite no longer being a tropical storm or depression, Bonnie will induce daily showers and thunderstorms across the Carolinas into the middle of the week.
After a mild and dry Memorial Day, warmth will build across the northwestern United States.
Extremely heavy rain fell over the weekend in southwestern Germany, leading to dangerous and deadly flash flooding.
New Yorkers will crowd city streets on Monday night in hopes of catching a view of Manhattanhenge, the stunning sunset that occurs four times a year.
Northern France will remain at risk for occasional rain through the first half of the week, threatening to cause additional delays at the French Open.
Vanport, OR (1948)
A railroad bed acting as a dam gave way during a flood along the Columbia River destroying the town of Vanport.
Unseasonably warm weather prevailed across the eastern U.S. Eighteen cities, from Virginia to Ohio and Michigan, reported record high temperatures. Baltimore, MD and Washington, DC reached 97 degrees. Newark, NJ was the nations high temperature at 98 degrees.
Mississippi/ Ohio Valleys (1989)
Thunderstorms produced severe weather from the Upper Mississippi Valley to the Upper Ohio Valley. A F-4 tornado injured three people and caused a million dollars damage at New Providence IA.