UPDATE 1:45 A.M. All watches and warnings have expired.
Watch Channel 11 News starting at 4 a.m. for the latest on this developing situation.
UPDATE 12:15 A.M. A Flash Flood Warning has been extended until 1:45 a.m.
UPDATED: 10:30 P.M.: All Port Authority rail service has been suspended due to flooding.
UPDATED: 9:40 P.M.: The Bethel Park Police Department has asked residents to stop calling unless they have a life-threatening emergency. "Property damage/flooding reports can be made at a later time." The municipality has also declared a state of emergency.
UPDATE: 9:20 P.M.: Showers and thunderstorms continue to produce heavy rainfall and flash flooding across the area. Radar estimates some places have seen 2 to 3 inches of rain in one hour. The rain and storm threat will taper toward midnight and fog will develop overnight.
UPDATE: 8:18 P.M.: A Flash Flood Warning has been issued for Westmoreland County until 12:15 a.m. Thursday.
UPDATE 7:55 P.M.: Flash Flood Warnings for Allegheny and Washington counties will continue until 10:45 p.m.
A Flash Flood Watch for Allegheny, Fayette, Washington and Westmoreland counties will continue until 10 p.m.
UPDATE 5:15 P.M.: Crews are pumping water off flooded roads in Latrobe.
Basements in the area are also filled with several feet of water.
Dispatchers told Channel 11 as quickly as the water is accumulating, it's receding just as quickly.
One woman said the fast-moving water washed away part of the foundation of her home.
UPDATE 5 P.M.: A Flash Flood Warning has been issued for Fayette County until 9 p.m.
Flash flooding is causing issues throughout our area.
A viewer sent in video of Route 711 in Stahlstown, Westmoreland County, almost underwater.
Heavy rains also caused high water in the city of Washington when part of Chestnut Street flooded.
Another video shows flooding on Camp Horne Road in Allegheny County.
UPDATE 4:18 P.M.: A Flash Flood Warning has been issued for Allegheny County until 5:45 p.m.
4:19 pm: Flash Flood Warning for Allegheny Co. including #Pittsburgh until 5:45 pm. 1.5 inches has fallen with an additional 0.5 to 1 inch possible. Turn around, don't drown! #PAwx pic.twitter.com/EWTnYV8dMN— Danielle Dozier WPXI (@DanielleDozier) June 20, 2018
UPDATE 3 P.M.: A Flash Flood Warning has been issued for Westmoreland County until 5:30 p.m.
UPDATE 11:00 a.m. - A Flash Flood Watch has been issued for much of our viewing area until 10 p.m. due to showers and storms that are expected this afternoon and evening.
The watch covers Allegheny, Westmoreland, Washington, Fayette, Green, Monongalia, Preston and Garrett counties. A watch means conditions are favorable for flash flooding but it is not a certainty.
Showers and thunderstorms are expected to continue through Wednesday night with a Flash Flood Watch in effect until 10 p.m.
Rainfall amounts of 1.5 to 2.5 inches are possible, with locally higher amounts in training thunderstorms. Gusty winds and lightning will also accompany the strongest storms.
STORM TRACKER: Showers, storms popping up through mid-week
Once the storms exit the area, mainly after midnight, fog will develop. Lows will be in the low 60s.
On Thursday, expect a partly sunny sky with isolated sprinkles possible. Most areas look to stay dry. Highs will reach the low 80s.
Showers will once again develop Friday as our next weather system moves in.
- LIVE UPDATES: 17-year-old shot, killed by police identified
- What we know now about Antwon Rose, 17-year-old fatally shot by police
- Flash flood watch issued as showers, storms inch closer
- WATCH: Deputy Rescues Bear Trapped in Car
© 2019 Cox Media Group.