Another round of storms has erupted in the Eastern states Thursday. The storms brought blinding downpours and flash flooding, as they rumbled through parts of Pennsylvania. A few of these storms also brought damaging winds as well.
Parts of central Pennsylvania experienced heavy rain early Thursday evening, resulting in multiple reports of widespread flooding. The severity of the flooding caused the necessity for water rescues in the Lock Haven area and even induce a mudslide in Pottsville, Pa.
The storms also prompted a possible tornado touchdown near Lock Haven University, Pa., earlier Thursday evening.
Major cities still at risk for the downpours and locally damaging winds include Hartford, Conn., New York City, Philadelphia, Wilmington, Del., Baltimore, Washington, Richmond, Va., Raleigh, N.C., Charlotte, N.C., Columbia, S.C., Atlanta and Montgomery, Ala.
While a large number of tornadoes is not expected, a couple of short-lived tornadoes are possible in the strongest storms, especially from central Maryland, central and southeastern Pennsylvania and the Delmarva Peninsula to New Jersey and upstate New York into Thursday evening.
People should be prepared for sudden near-zero visibility on the roads as the storms hit.
Flight delays at the Philadelphia, Newark, Teterboro, La Guardia and JFK airports have been reported due to the storms. It is likely that delays will continue at multiple major airports and connecting hubs as the storms continue into Thursday evening.
More communities will be slammed by torrential rain lasting long enough to cause flash and urban flooding. There is a high potential for 2 inches of rain in an hour's time, which is enough to overwhelm storm drains and bring small streams out of their banks.
A few locations may also be blasted by 60-mph wind gusts with or without heavy rain. Winds this strong can down trees, large tree limbs and power lines in some instances.
A small number of locations can be hit with large hail.
Keep in mind that lightning is one of Mother Nature's leading source of injuries and fatalities. If you can hear thunder, you are close enough to the storm to be struck by lightning, even if the sun is shining, the storm is not heading directly toward you or the storm has just passed.
If you have any plans to be out and about Thursday night over the eastern third of the nation, keep an eye out for rapidly changing weather conditions.
Dark skies ahead can signal blinding downpours, powerful winds and possible hail. If you get caught driving through this weather, pull well off the road to a safe location, away from any trees or power poles and wait for it to pass.
High humidity will linger over much of the eastern third of the nation into next week. Two large high pressure areas, a Bermuda high to the east and a massive high in the West, will squeeze out the moisture along the Atlantic Seaboard and the Appalachians in the form of rounds of torrential downpours. The pattern will increase the risk of flooding.
Expert Senior Meteorologist Alex Sosnowski contributed to the content of this story.
The tropics may become active this weekend and into early next week.
The risk of drenching and locally gusty thunderstorms has expanded to parts of Southern California, Arizona and Nevada.
The Northwest is dealing with yet another record-challenging heat wave to close out July. While relief will come next week, this heat wave will not be the last of the summer.
Flooding monsoon rain will continue this week in India and southeast Pakistan, but a drier pattern is expected to set in during August.
Volcanic ash was sent 19,812 meters (65,000 feet) into the air as a result of the eruption, the Australian Bureau of Meteorology reported in an volcanic ash advisory.
A cold front will press southward bringing relief from the heat to Spain, Italy and southeast Europe late this week.
New York City, NY (1996)
No 90 degree reading in Central Park in all of June and July - the first time on record this has happened.
Kanata, Ontario, Canada (1996)
A severe thunderstorm downed electrical wires and trapped people in their cars and a bus for 1-2 hours. Amazingly, nobody was injured.
Scituate, MA (1769)
Hail fell 12" deep and remained on the ground for 30 hours.