Thunderstorm Wind, Washington
- When
- July 9, 5:22 PM EST
- Where
- Washington County, 1 mi S of Burgettstown
- Property damage
- $3,000
- Reported by
- LAW ENFORCEMENT
- Coordinates
- 40.370, -80.400
Thunderstorm winds downed several large trees and power lines.
Damaging Winds in Pennsylvania, July 9, 1999
Severe thunderstorms formed ahead of a cold front which moved through western Pennsylvania during the evening of the 9th. Although damage was reported in 12 western Pennsylvania counties, the worst damage occurred in Beaver and Allegheny counties where strong straight-line winds downed numerous trees and left over 26,000 people without power.
Where it happened
Every event with a place to put it. Tap one for its entry below.
- Tornadoes
- Tropical storms and surge
- Floods
- Wind
- Hail
- Winter weather
- Heat and drought
- Cold
- Fire, smoke and dust
- Marine and coastal
- Other
The toll
- Deaths
- 0
- Injuries
- 1
- Property damage
- $221,000
- Crop damage
- None recorded
- Events
- 23
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
What happened
The episode as NWS PBZ wrote it up.
Severe thunderstorms formed ahead of a cold front which moved through western Pennsylvania during the evening of the 9th. Although damage was reported in 12 western Pennsylvania counties, the worst damage occurred in Beaver and Allegheny counties where strong straight-line winds downed numerous trees and left over 26,000 people without power. It took local utility companies over 48 hours to respond to all of the outages. In addition, nearly 500 storm-related calls were logged in the Beaver County Emergency Services Center on the evening of the 9th.
The radar
The national radar mosaic for the moment the first event began.
Event by event
23 thunderstorm wind. Local standard time, as filed.
Thunderstorm Wind, Allegheny
- When
- July 9, 5:45 PM EST
- Where
- Allegheny County, Baldwin
- Property damage
- $3,000
- Reported by
- LAW ENFORCEMENT
- Coordinates
- 40.380, -79.950
Thunderstorm winds downed several trees.
Thunderstorm Wind, Mercer
- When
- July 9, 6:20 PM EST
- Where
- Mercer County, 1 mi N of Mercer
- Property damage
- $3,000
- Reported by
- TRAINED SPOTTER
- Coordinates
- 41.250, -80.230
Thunderstorm winds estimated to 60 MPH by spotters downed several trees just north of the Mercer area.
Thunderstorm Wind, Mercer
- When
- July 9, 6:25 PM EST
- Where
- Mercer County, Kennard
- Property damage
- $3,000
- Reported by
- LAW ENFORCEMENT
- Coordinates
- 41.470, -80.330
Thunderstorm winds downed several trees.
Thunderstorm Wind, Venango
- When
- July 9, 6:25 PM EST
- Where
- Venango County, Pleasantville
- Property damage
- $3,000
- Reported by
- TRAINED SPOTTER
- Coordinates
- 41.600, -79.580
Thunderstorm winds downed several trees.
Thunderstorm Wind, Venango
- When
- July 9, 6:30 PM EST
- Where
- Venango County, Franklin
- Property damage
- $3,000
- Reported by
- TRAINED SPOTTER
- Coordinates
- 41.400, -79.850
Thunderstorm winds downed several trees.
Thunderstorm Wind, Lawrence
- When
- July 9, 6:35 PM EST
- Where
- Lawrence County, New Castle
- Property damage
- $3,000
- Reported by
- LAW ENFORCEMENT
- Coordinates
- 41.000, -80.350
Thunderstorm winds downed several trees and power lines.
Thunderstorm Wind, Beaver
- When
- July 9, 6:55 PM EST to 7:20 PM EST
- Where
- Beaver County, Countywide
- Measured
- 60 kt (69 mph)
- Property damage
- $100,000
- Reported by
- EMERGENCY MANAGER
- Coordinates
- 40.670, -80.330
Thunderstorm winds downed numerous trees across Beaver county as a line of storms moved from northwest to southeast across the county. Among the areas that reported damage were Darlington Borough, Beaver Falls, New Brighton, Rochester and Baden. The city of Beaver was perhaps the hardest hit area, with numerous trees blown down by winds estimated at over 60 MPH. One tree fell onto a parked station wagon, crushing it. Despite the widespread damage, no injuries were reported.
Thunderstorm Wind, Forest
- When
- July 9, 7:00 PM EST
- Where
- Forest County, Marienville
- Property damage
- $2,000
- Reported by
- LAW ENFORCEMENT
- Coordinates
- 41.450, -79.080
Thunderstorm winds down a few trees across SR 66.
Thunderstorm Wind, Lawrence
- When
- July 9, 7:05 PM EST
- Where
- Lawrence County, New Wilmington
- Property damage
- $3,000
- Reported by
- TRAINED SPOTTER
- Coordinates
- 41.130, -80.380
Thunderstorm winds downed several trees.
Thunderstorm Wind, Butler
- When
- July 9, 7:05 PM EST
- Where
- Butler County, Slippery Rock
- Property damage
- $3,000
- Reported by
- LAW ENFORCEMENT
- Coordinates
- 41.070, -80.050
Thunderstorm winds downed several trees.
Thunderstorm Wind, Butler
- When
- July 9, 7:12 PM EST
- Where
- Butler County, Zelienople
- Property damage
- $3,000
- Reported by
- TRAINED SPOTTER
- Coordinates
- 40.800, -80.130
Thunderstorm winds downed several trees.
Thunderstorm Wind, Mercer
- When
- July 9, 7:15 PM EST
- Where
- Mercer County, Leesburg
- Property damage
- $3,000
- Reported by
- TRAINED SPOTTER
- Coordinates
- 41.130, -80.220
Thunderstorm winds downed several trees.
Thunderstorm Wind, Clarion
- When
- July 9, 7:15 PM EST
- Where
- Clarion County, Clarion
- Property damage
- $2,000
- Reported by
- LAW ENFORCEMENT
- Coordinates
- 41.220, -79.400
A few trees were uprooted by thunderstorm winds.
Thunderstorm Wind, Butler
- When
- July 9, 7:20 PM EST
- Where
- Butler County, 4 mi W of Mars
- Property damage
- $15,000
- Reported by
- LAW ENFORCEMENT
- Coordinates
- 40.700, -80.100
Thunderstorm winds blew a large tree down onto SR 19 and blew the roof from a video store.
Thunderstorm Wind, Allegheny
- When
- July 9, 7:20 PM EST to 8:30 PM EST
- Where
- Allegheny County, Countywide
- Measured
- 60 kt (69 mph)
- Property damage
- $50,000
- Reported by
- EMERGENCY MANAGER
- Coordinates
- 40.430, -80.050
Thunderstorm winds estimated at over 60 MPH by spotters downed numerous trees and power lines across Allegheny County.
Thunderstorm Wind, Butler
- When
- July 9, 7:35 PM EST
- Where
- Butler County, Ekastown
- Property damage
- $1,000
- Reported by
- TRAINED SPOTTER
- Coordinates
- 40.720, -79.770
Thunderstorm winds downed a large tree.
Thunderstorm Wind, Jefferson
- When
- July 9, 7:40 PM EST
- Where
- Jefferson County, Desire
- Property damage
- $3,000
- Reported by
- TRAINED SPOTTER
- Coordinates
- 41.020, -78.880
Thunderstorm winds downed several trees.
Thunderstorm Wind, Armstrong
- When
- July 9, 7:45 PM EST
- Where
- Armstrong County, Parker City
- Property damage
- $3,000
- Reported by
- TRAINED SPOTTER
- Coordinates
- 41.100, -79.700
Thunderstorm winds downed several large trees.
Thunderstorm Wind, Jefferson
- When
- July 9, 7:51 PM EST
- Where
- Jefferson County, Punxsutawney
- Property damage
- $3,000
- Reported by
- TRAINED SPOTTER
- Coordinates
- 40.950, -78.970
Thunderstorm winds downed several large trees.
Thunderstorm Wind, Westmoreland
- When
- July 9, 8:00 PM EST
- Where
- Westmoreland County, New Kensington
- Property damage
- $3,000
- Reported by
- TRAINED SPOTTER
- Coordinates
- 40.570, -79.770
Thunderstorm winds downed several trees.
Thunderstorm Wind, Washington
- When
- July 9, 8:00 PM EST
- Where
- Washington County, Atlasburg
- Property damage
- $3,000
- Reported by
- TRAINED SPOTTER
- Coordinates
- 40.330, -80.380
Thunderstorm winds downed several trees.
Thunderstorm Wind, Indiana
- When
- July 9, 8:30 PM EST
- Where
- Indiana County, Clymer
- Measured
- 53 kt (61 mph)
- Injuries
- 1 direct, 0 indirect
- Property damage
- $3,000
- Reported by
- TRAINED SPOTTER
- Coordinates
- 40.670, -79.020
A thunderstorm wind gust estimated at 60 MPH by a spotter downed several trees. Lightning from this storm also injured one person in Clymer.
What these are
- Thunderstorm Wind
- Winds from a thunderstorm of 50 knots (58 mph) or more, or lower winds that caused damage or casualties. Measured gusts are marked MG, estimated EG.
After NWS Directive 10-1605, the rules offices file Storm Data by.
The same day elsewhere
- Tornadoes and Flash Flood in Ohio, July 9, 1999
- Heat in Arkansas, July 9 to 11, 1999
- Damaging Winds in Pennsylvania, July 9, 1999
- Tornado and Damaging Winds in Ohio, July 9, 1999
- Hail and Damaging Winds in Ohio, July 9, 1999
- Damaging Winds in New York, July 9, 1999
- Hail and Damaging Winds in New York, July 9, 1999
- Wildfire in Virginia, July 9, 1999
- Tornado in Florida, July 9, 1999
- Damaging Wind in Illinois, July 9, 1999
- Damaging Winds in Pennsylvania, July 9, 1999
- Damaging Winds in West Virginia, July 9 to 31, 1999
More
Every storm in Pennsylvania in 1999Every state in 1999This day in weather historyWarnings in Pennsylvania, July 1999
Sources
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 5715920, 5715921, 5715922, 5715923, 5715924, 5715925, 5715926, 5716034, 5715928, 5715927, 5715929, 5715930, 5716031, 5716032, 5716033, 5716035, 5716036, 5716039, 5716037, 5716038, 5716040, 5716042, 5716041.