An unusually strong low pressure for this time of year will spark powerful storms across much of the East into Friday night.
Storms have already produced torrential downpours this morning across much of Ohio, Pennsylvania, New York and Virginia. More of the same is on the way as well as the potential for damaging wind, hail and a couple of tornadoes.
Cities targeted include New York City, Philadelphia, Baltimore, Washington, D.C., Harrisburg, Allentown, Richmond, Virginia Beach, Raleigh and Columbia.
The most potent storms will explode this afternoon as the low pressure heads toward the area and strengthens, feeding off of tropical-like humidity.
Damaging blasts of wind, hail larger than quarters, and drenching downpours are all possible as rounds of slow-moving storms track east.
According to Severe Weather Expert Henry Margustiy, "An upper level disturbance lifting northward across Long Island and into central and eastern New England has the potential to produce a couple of tornadoes during the afternoon and early evening."
Blinding rain from time to time will cause plenty of travel headaches for motorists on major interstates. I-95, I-81, and I-80 are all in the crosshairs. Conditions will be just as bad on the New York Thruway and the Massachusetts, New Jersey and Pennsylvania turnpikes.
If you'll be traveling to or from area airports into Friday night, don't expect anything better, as locally severe storms threaten to cause plenty of flight delays.
Be alert for rapidly changing weather conditions and heed any watches or warnings that may be issued. Remember, if a warning is issued, this means a dangerous thunderstorm is imminent and you should take shelter immediately.
Be sure to stay with us at AccuWeather.com for all the latest details on this impending severe weather event.
The combination of excessive heat and dry thunderstorms in many areas will add to the wildfire threat in the western part of United States and Canada through much of July.
Americans will be hoping for clear skies this Saturday, July 4, as they look to enjoy dazzling fireworks displays, in addition to other popular Fourth of July activities.
A pair of disturbances tracking eastward from the Plains will bring bouts of showers and thunderstorms to the East through the rest of the week.
Tuesday, June 30, will be the longest day of the year by exactly 1 second.
The heat wave that started across Spain and Portugal, will spread across much of Europe this week with some of the hottest conditions of the year.
The last major eruption of Mount Hakone occurred around 2,900 years ago, according to the Global Volcanism Project at the Smithsonian Institution.
Pitcairn, PA (1997)
4" of rain in 90 minutes causes 10 million dollars in flooding damage.
Grand Forks, ND (2001)
37 degrees, new record low for date.
Flooding continues: Flood waters removed 30 feet of asphalt along highway 160 east of Elk Falls, KS, and roads in eastern Sumner county, KS were stilled closed. Approximately 5 feet of water was flowing over Highway H west of Nevada, MO the morning of the 1st. Stark, KS had 4.5 inches of rain from the night of the 30th into the 1st, and Neodesha, KS had 15 inches of rain over the weekend.