Thunderstorm Wind, Delaware
- When
- August 14, 3:55 PM EST to 4:15 PM EST
- Where
- Delaware County, Countywide
- Reported by
- EMERGENCY MANAGER
- Coordinates
- 39.930, -75.430
Damaging Wind and Lightning Strike in Pennsylvania, August 14, 1999
A severe thunderstorm knocked down large tree limbs and wires throughout Delaware County. PECO Energy reported about 40,000 homes and businesses lost power in Chester and Delaware Counties.
Where it happened
Every event with a place to put it; 1 filed by county or forecast zone are drawn at its center, in a lighter ring. 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
- None recorded
- Crop damage
- None recorded
- Events
- 2
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 PHI wrote it up.
A severe thunderstorm knocked down large tree limbs and wires throughout Delaware County. PECO Energy reported about 40,000 homes and businesses lost power in Chester and Delaware Counties. About a quarter of the outages were attributed to the wind. There were about 1,600 cloud-to-ground lightning strikes as the thunderstorms moved through Southeast Pennsylvania. The storms overnight produced about 5,000 cloud-to-ground strikes. One lightning strike unfortunately started a fire in the garage of a Marple Township house. It spread quickly and went to three alarms. The house was reduced to rubble and ash. One firefighter suffered dehydration, no other injuries were reported.
The radar
The Philadelphia radar (KDIX), 87 km away, was scanning. The volume nearest the first event began at 20:57 UTC.
Event by event
1 thunderstorm wind, 1 lightning. Local standard time, as filed.
Lightning, Delaware
- When
- August 14, 4:15 PM EST
- Where
- Delaware County, Broomall
- Reported by
- NEWSPAPER
- Coordinates
- 39.917, -75.399 (the zone’s center; the record gives no point)
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.
- Lightning
- A lightning strike that killed, injured or caused damage.
After NWS Directive 10-1605, the rules offices file Storm Data by.
The same day elsewhere
- Tornado in Montana, August 14, 1999
- Lightning Strike in New Jersey, August 14, 1999
- Damaging Wind in Louisiana, August 14, 1999
- Heat in Texas, August 14, 1999
- Damaging Wind in Louisiana, August 14, 1999
- Tornado and Damaging Winds in Maryland, August 14, 1999
- Hail and Damaging Winds in Florida, August 14, 1999
- Damaging Winds and Lightning Strike in Virginia, August 14, 1999
- Damaging Wind in Mississippi, August 14, 1999
- Lightning Strikes in North Carolina, August 14, 1999
- Damaging Winds in Georgia, August 14, 1999
- Damaging Winds and Lightning Strikes in Georgia, August 14, 1999
More
Every storm in Pennsylvania in 1999Every state in 1999This day in weather historyWarnings in Pennsylvania, August 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: 5717985, 5717984.