[PHI] NBC10 First Alert Severe Weather Central

PHI

Loud Lightning Storms Rattle the Area

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    NEWSLETTERS

    A blast of lightning startled people around the region, and damaged property too. (Published Wednesday, Feb 19, 2014)

    Were you startled by a loud boom and a bright flash this morning?

    You aren’t alone -- the loud booms shook people and left them asking what happened.

    We asked the NBC10 First Alert Weather Team to explain the phenomenon.

    Loud thunder claps shook buildings, including our own NBC10 studio in Bala Cynwyd, around 10:20 a.m. Wednesday. From Delaware to Chester County to South Jersey people reported feeling buildings rattle and seeing bright flashes in the sky.

    What Kind of Thunderstorm Caused Boom

    [PHI] What Kind of Thunderstorm Caused Boom
    NBC10 chief meteorologist Glenn "Hurricane" Schwartz describes what type of thunderstorm caused a loud boom. (Published Wednesday, Feb 19, 2014)

    The NBC10 weather team says the loud boom was caused by lightning that amplified thanks to the cold air. Since the air is colder this time of year it has a higher density than air we have during thunderstorms that we get in spring and summer.

    First Alert Weather: Bill Explains "Big Boom"

    [PHI] First Alert Weather: Bill Explains "Big Boom"
    It was the lightning bolt heard 'round the region, but what, exactly, caused it? NBC10 meteorologist Bill Henley has the answer. (Published Friday, Feb 28, 2014)

    NBC10 First Alert Weather meteorologist Glenn "Hurricane" Schwartz said that numerous lightning strikes caused the loud bangs that felt almost like earthquakes.

    Hurricane says that it's unlikely the rattling was anything more than lightning and the U.S. Geological Survey didn't report any earthquakes anywhere on the East Coast.

    "Sound is affected by the density of the air," said Hurricane.

    Powerful Storms Knock Down Power Lines

    [PHI] Powerful Storms Knock Down Power Lines
    The powerful thunderstorms that moved through our area was felt in Roxborough where power lines were knocked down causing some outages. (Published Thursday, Feb 20, 2014)

    "The National Weather Service believes density is the main factor."

    NBC10 First Alert Weather meteorologist Bill Henley said that the lack of leaves and foliage also causes sound to travel more clearly. It's the same reason why you are more likely to hear a far off train in winter rather than summer.

    The fact that lightning bolts can be dozens of miles long also could have led to rolling thunder heard around the region.

    The loud boom felt in Bala Cynwyd could also be felt in Roxborough, Northeast Philadelphia and the Main Line. Other loud booms were also felt in Bucks, Chester, Mercer, Montgomery and Camden Counties. There were also reports of rumbling thunder and lightning as far south as Newark, Del.

    Boom Lights Up Twitter

    [PHI] Boom Lights Up Twitter
    We all heard it, so felt it and lots of people took to twitter to question...the big boom. (Published Friday, Feb 28, 2014)

    The weather team said the string of lightning strikes lasted less than 20 minutes but the damage was done.

    The storm broke windows, knocked down power lines and turned the lights out on hundreds of homes and businesses in Philadelphia's Roxborough neighborhood.

    Sharon DiFranco McMurray felt the boom and saw the lightning along Roxborough Avenue.

    "Felt like a military jet flying overhead & then a loud Boom! The lightning lit up my house. Very scary and the thunder lasted 30 seconds."

    Residents Describe Big Boom

    [PHI] Residents Describe Big Boom
    NBC10 spoke to local residents who say that they were freaked out at the sounds of a thunderstorm earlier this morning. (Published Friday, Feb 28, 2014)

    The storm began to move out of the area by mid-afternoon.