Storms loomed over Pennsylvania on Thursday, as residents across the Northeast braced for damaging weather.

The National Weather Service issued tornado warnings for specific regions in Pennsylvania, including Tioga and Jefferson counties. Severe thunderstorm warnings were issued for Western and Central Pennsylvania, with one alert issued at 4pm EDT reading: "SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS!" The warning asked residents to report hail and damage to the National Weather Service by calling toll free: 1-877-633-6772.

WPXI News reported:

At 2:45 p.m. a long line of severe storms stretched from Bradford, Pa., southwest to Athens, Ohio, moving east-southeast at 35-35 mph. These storms will continue to come together and go through the area through late this afternoon. Another line of storms is possible later this evening behind the first line.

Brookville's local law enforcement reported a tornado in the region around 3:30pm EDT, and Jefferson County officials report that a possible tornado touched down in Barnett.

Public Safety Director Michael Huss warned, "Residents must use extreme caution, especially during their rush hour commute. Do not drive into flooded water, and look out for downed trees and power lines."

Roger Edwards, a meteorologist at the Storm Prediction Center in Norman, Oklahoma, told Bloomberg News, “We are confident that there are going to be many wind damage reports from southern New England back into Pennsylvania and Ohio ... It’s just a question of whether it’s organized enough that we can call it a derecho.”

Visit the National Weather Service website for Pennsylvania storm warnings in your region.

Click here for updated information.

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@ lheron : Awesome (in the terrifying sense) #nyc #derecho storm photo by @isardasorensen: http://t.co/hDNHgopA cc @wsjweather

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@ BuzzFeedAndrew : Lower Manhattan as seen from New Jersey. http://t.co/d7DRP2rW

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@ AC360 : #AC360 staff momentarily distracted by this outside our window: http://t.co/r063uSS9 NYC storm #Derecho

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@ severewarn : Severe Thunderstorm Watch for portions of the area in WV until 10:00pm EDT. #wvwx

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@ wkycweather : Forecast... Cleveland Weather: We aren't done yet http://t.co/GY1Z55YJ #Weather_Forecast #wkycweather

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@ MayorMark : Danbury 10 year olds stopping game to take shelter. #Danbury

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@ DarrenSweeney : The bowing I'm seeing on the radar tells me some big, widespread wind is likely especially in SW CT,awnings up lawn furniture in! #ctweather

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@ CTDEMHS : FLOOD WATCH STILL IN EFFECT FOR HARTFORD, TOLLAND AND WINDHAM COUNTIES

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@ wtaptelevision : Storms Shut Down Operations At Ohio State Fair: A powerful storm rolling through Ohio has shut down operations a... http://t.co/3c8gNSpm

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@ WxBeck : Thunderstorms are now spanning a line approximately ~2000 miles, from Texas, northeast to the bow moving into NYC. Impressive storm day.

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Storms have brought several inches of rain to Summit and Medina counties in Ohio, reports WKYC.

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@ TWCBreaking : A new #severe thunderstorm watch until 1am EDT for all of #Delaware, most of #Maryland, northern #Virginia, eastern #WV, and #DC

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@ Doppler10 : Another storm has popped up to the southwest of Marysville, Ohio. There's another one to the northwest. Follow... http://t.co/PxCQ06Y2

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@ nbc40weather : Severe thunderstorm watch for all of South Jersey now until 1am...included are Atlantic, Cumberland, Cape May, and Salem counties.

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@ EricFisherTWC : First Energy reporting nearly 100k customers without power in Pennsylvania alone. More to come around the region. #PAwx

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@ EricFisherTWC : From Bradford County: Massive reports of trees/branches with wires down but no reported structural damage. Lost one radio tower. #PAwx

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@ twcMariaLaRosa : Amazing solid line of warnings with this monster squall line; includes #NYwx #PAwx #WVwx #OHwx #severe @weatherchannel http://t.co/S4WO3JMF

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@ WSAZKari : Storm already hit my cousin's house up in northern Ohio. High winds!! Cable knocked out.

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@ usNWSgov : #Tornado impacts #Elmira, #NY, damaging the Arnot Mall and Elmira Country Club with people trapped in vehicles. #nywx

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Clouds move in over Geneva, Ohio, reports WKYC.

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@ severewarn : Severe Thunderstorm Warning for Athens, Gallia, Jackson, Meigs, Morgan, Vinton and Washington County in OH until 6:15pm EDT. #ohwx

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@ NYGovCuomo : Reports of significant damage in Elmira, possible tornadic activity, state assessment crews on the way #stormwatch

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@ mikeseidel : Per Chemung County, NY Emergency Management: Report of a Tornado Elmira Buildings Destroyed Houses on fire People trapped Unknown injuries

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@ IrishEagle : 2 pics out of Elmira, NY: http://t.co/jgVNkIS3 http://t.co/0Hw3bCCu #nywx

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@ usNWSgov : #Tornado impacts #Elmira, #NY, damaging the Arnot Mall and Elmira Country Club with people trapped in vehicles. #nywx

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@ breakingweather : 56,000 currently without power across Pennsylvania

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@ breakingweather : 23,000 customers are without power across the state of Ohio.

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@ breakingstorm : Report of storm damage to mall, country club in Elmira, New York - @usNWSgov

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@ usNWSgov : #Severe Tstorm Watch 524 in effect until 10pm EDT for portions of #IN, #KY #MD, #NY, #OH, #PA and #WV. http://t.co/kCPjwUtJ | #NWS #SPC

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Earlier on HuffPost:

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  • An American beech tree lies on Capitol Hill grounds in Washington, Saturday, June 30, 2012, in front of the U.S. Supreme Court, background, after a powerful storms swept across the eastern U.S. Friday evening. (AP Photo/Manuel Balce Ceneta)

  • Frances Lukens looks at the tangle of boards and tree limbs piercing her living room ceiling in Lynchburg, Va. on Saturday, June 30, 2012 after a huge oak tree fell directly on the house during a storm the previous night. (AP Photo/The News & Advance, Parker Michels-Boyce)

  • In this Friday, June 29, 2012 photo, a car sits damaged from where a brick wall fell on it from the second story of a store in Columbus Grove, Ohio. The bricks fell on and crushed two vehicles as strong winds tore through the region Friday afternoon. (AP Photo/The Lima News, Jay Sowers)

  • A tree sitting atop a vehicle offers free firewood in Falls Church, Va., Monday, July, 2, 2012, as cleanup continued after Friday's storm, Around 2 million utility customers are without electricity across a swath of states along the East Coast and as far west as Illinois as the area recovers from a round of summer storms that has also caused at least 17 deaths. (AP Photo/Karen Mahabir)

  • A utility pole is cracked in half by a downed tree on a residential street in Arlington, Va., Sunday, July 1, 2012. Severe storms swept through the area leaving many homes and businesses without electricity. (AP Photo/Cliff Owen)

  • Marcia McCloud (right) and her great-granddaughter Makayla Milton, find some comfort together at the Red Cross cooling shelter at Sandusky Middle School in Lynchburg, Va., July 1, 2012. Milton was visiting her great-grandmother Friday when the storm hit and the two were forced to find other shelter. McCloud explained, "It's like a vacation, vacation away from home!" (AP Photo/The News & Advance, Parker Michels-Boyce)

  • Joe Tiago

    Joe Tiago takes pictures of a downed utility pole and electric transformer on Old Keene Mill Road, Sunday, July 1, 2012 in Springfield Va. A severe storm late Friday knocked out power to approximately one million residents, traffic signals and businesses in the region. (AP Photo/Pablo Martinez Monsivais)

  • Residents of the Cleveland Park neighborhood of Washington, navigate underneath a downed tree, Sunday, July 1, 2012. A severe storm late Friday, June 29th knocked out power to approximately one million residents, traffic signals and businesses in the region. (AP Photo/Pablo Martinez Monsivais)

  • A worker uses a chainsaw to clear a tree that fell onto the 14th fairway at Congressional Country Club in Bethesda, Md., Saturday, June 30, 2012, after a strong storm blew through overnight. The AT&T National golf tournament was postponed to allow workers to clear the course. (AP Photo/Patrick Semansky)

  • A van and boat sit crushed by fallen trees, as crews work to restore power Saturday, June, 30, 2012, in Northfield, N.J. Severe thunderstorms packing heavy rain, lightning and strong winds that gusted up to 70 mph hit the state Saturday, knocking out power to hundreds of thousands and killing at least two. (AP Photo/Mel Evans)

  • Using crutches, Cooper Scott talks about the car where he and his mother were trapped in Lynchburg, Va. Saturday, June 30, 2012 after a large oak tree fell on them during the storm the night before. Both spent most of the night in the hospital but were back at home by Saturday morning. (AP Photo/The News & Advance, Parker Michels-Boyce)

  • Marilyn Golias, right, looks at the remains of a utility pole which fell across the street from her house in Falls Church, Va., Saturday, June 30, 2012. Millions across the mid-Atlantic region sweltered Saturday in the aftermath of violent storms that pummeled the eastern U.S. with high winds and downed trees, killing at least 13 people and leaving 3 million without power during a triple-digit heat wave. (AP Photo/Cliff Owen)

  • Lighting flashes Saturday morning, June, 30, 2012 in Hebron Md.. Violent storms swept across the eastern U.S., killing at least nine people and knocking out power to hundreds of thousands on a day that temperatures across the region are expected to reach triple-digits. (AP photo by Salisbury Daily Times, Kristin Roberts)

  • Cesar de Jesus,

    Cesar de Jesus, 4, from Riverdale, Md., play peek-a-boo from under a Red Cross blanket at a Red Cross shelter at Northwestern High School gym Saturday, June 30, 2012 in Hyattsville, Md. near Washington. Violent evening storms following a day of triple-digit temperatures wiped out power to more than 2 million people across the eastern United States. (AP Photo/Alex Brandon)

  • In this photo taken Friday, June 29, 2012 shows a trampoline smashed into the side of the garage in Lima, Ohio. Violent storms swept across the eastern U.S., killing at least 10 people and knocking out power to millions of people on a day that temperatures across the region are expected to reach triple-digits. The storms were blamed for the deaths of six people in Virginia; two in New Jersey; one in Ohio; and another in Maryland. (AP Photo/The Lima News, Gretchen White)

  • Larry Pellino

    Larry Pellino repairs the site of the AIDS Memorial Quilt display damaged by a powerful storm that swept across the Washington region Friday, at the National Mall in Washington Saturday, June 30, 2012. Organizers of the quilt display are planning to put the exhibit back on Sunday. Violent storms swept across the eastern U.S., killing at least nine people and knocking out power to hundreds of thousands on a day that temperatures across the region are expected to reach triple-digits. Officials said about 500,000 people were without power in West Virginia. (AP Photo/Manuel Balce Ceneta)

  • A tree lies on top of a storage building at the home Saturday, June 30, 2012 in Charleston, W.Va. (AP Photo/Jeff Gentner)

  • A passing storm brought a halt to rides Friday, June 29, 2012 at the 26th annual Italian-American Festival being held this weekend at the Stark County Fairgrounds in Canton, Ohio. A wave of violent storms sweeping through the mid-Atlantic following a day of record-setting heat in Washington, D.C., has knocked out power to nearly 2 million people. The storms converged Friday night on Washington, D.C., Maryland, Virginia and West Virginia. West Virginia Gov. Earl Ray Tomblin declared a state of emergency after more than 500,000 customers in 27 counties were left without electricity. (AP Photo/The Repository, Bob Rossiter)

  • A tree toppled by severe storms sits atop a car in Washington's Dupont Circle neighborhood on Saturday, June 30, 2012 in Washington. More than two million people across the eastern U.S. lost power after violent storms and two people died, including a 90-year-old woman asleep in bed when a tree slammed into her home, a police spokeswoman said Saturday. (AP Photo/Jessica Gresko)

  • Clouds roll over Mundelein, Ill., as a storm moves through the area Friday, June 29, 2012.(AP photo/Daily Herald, Steve Lundy)

  • Raw Video: Storms Kill 3 in North Carolina

    Authorities say three people were killed when a sudden storm struck in eastern North Carolina, damaging homes and uprooting trees.