Thunderstorm Wind, Chester
- When
- February 12, 5:00 PM EST
- Where
- Chester County, 4 mi NE of Malvern
- Measured
- 50 kt (58 mph)
- Reported by
- EMERGENCY MANAGER
- Coordinates
- 40.070, -75.480
Damaging Wind in Pennsylvania, February 12, 1999
A squall line of strong to locally severe thunderstorms moved through Chester County. Several trees and wires were knocked down from Tenderizer Township west through West Whiteland Township.
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
- None recorded
- Crop damage
- None recorded
- Events
- 1
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 squall line of strong to locally severe thunderstorms moved through Chester County. Several trees and wires were knocked down from Tenderizer Township west through West Whiteland Township. U.S. Route 202 was closed because of downed wires. About 3,000 homes in Chester County lost power. An unseasonably warm air mass and a strong cold front conspired to produce a line of strong to locally severe thunderstorms across southeast Pennsylvania. Preceding this line, high temperatures soared to record breaking levels at both the Philadelphia (70 degrees, previous record 61 degrees set in 1898) and Lehigh Valley (69 degrees, previous record 59 degrees set in 1932) International Airports.
The radar
The Philadelphia radar (KDIX), 92 km away, was scanning. The volume nearest the first event began at 22:00 UTC.
Event by event
1 thunderstorm wind. Local standard time, as filed.
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
- High Surf in Hawaii, February 12 to 14, 1999
- Tornado in New Jersey, February 12, 1999
- Damaging Wind in Delaware, February 12, 1999
- Winter Weather in West Virginia, February 12, 1999
- Damaging Winds and Lightning Strike in Maryland, February 12, 1999
- Damaging Wind in Pennsylvania, February 12, 1999
- Lake-Effect Snow in Michigan, February 12 to 13, 1999
- Winter Weather in Ohio, February 12, 1999
- Blizzard in Minnesota, February 12, 1999
- Hail and Damaging Winds in Virginia, February 12, 1999
- Heavy Snow in Ohio, February 12 to 13, 1999
- Winter Weather in Kentucky, February 12, 1999
More
Every storm in Pennsylvania in 1999Every state in 1999This day in weather historyWarnings in Pennsylvania, February 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: 5689270.