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12:10 a.m. Thursday update: York County is now under an urban and small stream flood advisory until 2:45 a.m., according to the National Weather Service. Runoff from earlier rains and showers overnight will lead to flooding in small creeks and low-lying areas.

Met-Ed is reporting 10,243 customers without power, with concentrations in Hellam Township, Manchester Township and outside Spring Grove. The power company says it hopes to have power restored to all customers by 1 p.m. Thursday.

PPL is reporting 133 outages in York County among 1,800 customers without power in its coverage area through central Pennsylvania.

In Lancaster County, the NWS will sent a team out Thursday to see if a tornado touched down, according to The Associated Press.

Meteorologist John LaCorte says the Wednesday night storm caused multiple buildings to collapse, tore roofs off homes and downed trees and power lines. There’s at least one report of a barn that had collapsed with animals trapped inside, AP said.

9:30 p.m. Wednesday update: Met-Ed is reporting 20,952 customers without power in York County, according to the company's website.

Pockets of outages are found in York City, the Red Lion area and Spring Grove, according to the website.

The company expects to restore power to most customers by 1 p.m. Thursday, the website said.

7:54 p.m. Wednesday update: More than 7,400 people don't have power around York County, according to Met-Ed's website.

More than 1,300 of those are in York City, with the next-largest concentrations to the south and east of it, the site shows.

Update: York County is under a number of weather warnings and watches Wednesday evening.

There's a severe thunderstorm warning until 7:30 p.m., with torrential rains and winds up to 60 mph reported.

There is also a flood advisory to go along with that until 7:45 p.m., as the downpours are flooding streets and streams.

A tornado watch is in effect until 11 p.m., and a flash flood watch until 9 p.m.

Met-Ed is reporting scattered power outages, mostly in the southeastern part of the county.

Check back later for more information.

Previous story: Conditions are right Wednesday night around York County for both tornadoes and flash floods.

The National Weather Service has issued a tornado watch effective until 11 p.m. and flash flood watch until 9 p.m. for several counties in the region.

Before 9 p.m., the weather service says, thunderstorms will roll through the lower Susquehanna Valley region, dropping enough rain that some flash flooding is possible. Authorities advise people not to try to drive through flooded roadways.

When the NWS issues a watch, that means it deems the conditions are right for the weather events to happen. That's less immediately serious than a warning — which they haven't issued for anything on Wednesday — which the organization only puts out when an instance of the weather event has been spotted.

— Reach Sean Cotter at scotter@yorkdispatch.com.

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