Thunderstorm Wind, Venango
- When
- July 31, 6:55 AM EST
- Where
- Venango County, Seneca
- Property damage
- $3,000
- Reported by
- TRAINED SPOTTER
- Coordinates
- 41.380, -79.720
Thunderstorm winds downed trees and power lines onto SR 257 and US 322.
Damaging Winds in Pennsylvania, July 31, 1999
20 thunderstorm wind, as filed by the National Weather Service.
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
- 0
- Property damage
- $132,000
- Crop damage
- None recorded
- Events
- 20
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.
The radar
The Pittsburgh radar (KPBZ), 103 km away, was scanning. The volume nearest the first event began at 11:53 UTC.
Event by event
20 thunderstorm wind. Local standard time, as filed.
Thunderstorm Wind, Lawrence
- When
- July 31, 5:25 PM EST
- Where
- Lawrence County, Frizzleburg
- Property damage
- $3,000
- Reported by
- TRAINED SPOTTER
- Coordinates
- 41.080, -80.470
Thunderstorm winds downed several trees.
Thunderstorm Wind, Mercer
- When
- July 31, 5:44 PM EST
- Where
- Mercer County, Mercer
- Property damage
- $3,000
- Reported by
- TRAINED SPOTTER
- Coordinates
- 41.230, -80.230
Thunderstorm winds downed several trees.
Thunderstorm Wind, Mercer
- When
- July 31, 5:47 PM EST
- Where
- Mercer County, Sharon
- Measured
- 57 kt (66 mph)
- Property damage
- $50,000
- Reported by
- TRAINED SPOTTER
- Coordinates
- 41.250, -80.500
Thunderstorm winds estimated by a spotter at 65 MPH downed several trees, some of which fell onto homes.
Thunderstorm Wind, Venango
- When
- July 31, 5:56 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, Mercer
- When
- July 31, 6:05 PM EST
- Where
- Mercer County, Sharpsville
- Property damage
- $25,000
- Reported by
- TRAINED SPOTTER
- Coordinates
- 41.250, -80.470
Thunderstorm winds downed a barn and several trees.
Thunderstorm Wind, Venango
- When
- July 31, 6:05 PM EST
- Where
- Venango County, Lisbon
- Property damage
- $3,000
- Reported by
- TRAINED SPOTTER
- Coordinates
- 41.200, -79.800
Thunderstorm winds downed several trees.
Thunderstorm Wind, Lawrence
- When
- July 31, 6:20 PM EST
- Where
- Lawrence County, Edinburg
- Property damage
- $3,000
- Reported by
- TRAINED SPOTTER
- Coordinates
- 41.020, -80.450
Thunderstorm winds downed several trees.
Thunderstorm Wind, Butler
- When
- July 31, 6:20 PM EST
- Where
- Butler County, Slippery Rock
- Property damage
- $3,000
- Reported by
- TRAINED SPOTTER
- Coordinates
- 41.070, -80.050
Thunderstorm winds downed several trees.
Thunderstorm Wind, Forest
- When
- July 31, 6:26 PM EST
- Where
- Forest County, Marienville
- Property damage
- $1,000
- Reported by
- TRAINED SPOTTER
- Coordinates
- 41.450, -79.080
Thunderstorm winds downed a large tree onto SR 899.
Thunderstorm Wind, Clarion
- When
- July 31, 6:36 PM EST
- Where
- Clarion County, Clarion
- Property damage
- $3,000
- Reported by
- TRAINED SPOTTER
- Coordinates
- 41.220, -79.400
Thunderstorm winds downed several trees.
Thunderstorm Wind, Beaver
- When
- July 31, 6:45 PM EST
- Where
- Beaver County, Darlington
- Property damage
- $3,000
- Reported by
- TRAINED SPOTTER
- Coordinates
- 40.820, -80.420
Thunderstorm winds downed several trees.
Thunderstorm Wind, Armstrong
- When
- July 31, 6:45 PM EST
- Where
- Armstrong County, Parker City
- Property damage
- $5,000
- Reported by
- TRAINED SPOTTER
- Coordinates
- 41.100, -79.700
Thunderstorm winds downed several trees across the area, blocking SR 268.
Thunderstorm Wind, Butler
- When
- July 31, 6:45 PM EST
- Where
- Butler County, Butler
- Property damage
- $3,000
- Reported by
- TRAINED SPOTTER
- Coordinates
- 40.850, -79.880
Thunderstorm winds downed several trees.
Thunderstorm Wind, Jefferson
- When
- July 31, 7:00 PM EST
- Where
- Jefferson County, Brookville
- Property damage
- $5,000
- Reported by
- TRAINED SPOTTER
- Coordinates
- 41.170, -79.080
Thunderstorm winds downed several trees, blocking local streets in Brookville.
Thunderstorm Wind, Lawrence
- When
- July 31, 7:35 PM EST
- Where
- Lawrence County, New Castle
- Property damage
- $3,000
- Reported by
- TRAINED SPOTTER
- Coordinates
- 41.000, -80.350
Thunderstorm winds downed several large trees.
Thunderstorm Wind, Butler
- When
- July 31, 7:40 PM EST
- Where
- Butler County, Prospect
- Property damage
- $2,000
- Reported by
- TRAINED SPOTTER
- Coordinates
- 40.900, -80.050
Thunderstorm winds downed a few trees.
Thunderstorm Wind, Allegheny
- When
- July 31, 8:00 PM EST
- Where
- Allegheny County, East Mc Keesport
- Property damage
- $5,000
- Reported by
- TRAINED SPOTTER
- Coordinates
- 40.380, -79.800
Thunderstorm winds downed several large trees and power lines.
Thunderstorm Wind, Westmoreland
- When
- July 31, 8:05 PM EST
- Where
- Westmoreland County, Circleville
- Property damage
- $3,000
- Reported by
- TRAINED SPOTTER
- Coordinates
- 40.320, -79.730
Thunderstorm winds downed several large trees.
Thunderstorm Wind, Beaver
- When
- July 31, 9:05 PM EST
- Where
- Beaver County, Beaver Falls
- Property damage
- $3,000
- Reported by
- TRAINED SPOTTER
- Coordinates
- 40.750, -80.330
Thunderstorm winds downed several trees and power lines.
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
- Damaging Winds in New York, July 31, 1999
- Heavy Rain in New Mexico, July 31, 1999
- Heat in Arkansas, July 31, 1999
- Hail and Damaging Winds in Michigan, July 31, 1999
- Flash Flood in Colorado, July 31, 1999
- Flooding in Iowa, July 31, 1999
- Hail and Damaging Winds in Ohio, July 31, 1999
- Damaging Winds in Virginia, July 31, 1999
- Damaging Winds in Ohio, July 31, 1999
- Damaging Winds and Lightning Strike in Ohio, July 31, 1999
- Damaging Winds in West Virginia, July 31, 1999
- Damaging Winds in Pennsylvania, July 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 2026-10-01. Each event’s entry at NCEI: 5716256, 5716257, 5716258, 5716259, 5716260, 5716261, 5716262, 5716338, 5716339, 5716340, 5716341, 5716342, 5716343, 5716344, 5716345, 5716346, 5716350, 5716347, 5716348, 5716349.