Hail, Beaver
- When
- April 21, 11:25 PM EST
- Where
- Beaver County, Ambridge
- Measured
- 0.75 in hail
- Reported by
- EMERGENCY MANAGER
- Coordinates
- 40.600, -80.230
Flash Flood and Hail in Pennsylvania, April 21 to 23, 1999
5 hail, 3 thunderstorm wind, 1 flash flood, as filed by the National Weather Service.
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
- $7,000
- Crop damage
- None recorded
- Events
- 9
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 national radar mosaic for the moment the first event began.
Event by event
5 hail, 3 thunderstorm wind, 1 flash flood. Local standard time, as filed.
Hail, Allegheny
- When
- April 21, 11:40 PM EST
- Where
- Allegheny County, Sewickley Hgts
- Measured
- 1.75 in hail
- Reported by
- EMERGENCY MANAGER
- Coordinates
- 40.550, -80.150
Hail, Allegheny
- When
- April 21, 11:46 PM EST
- Where
- Allegheny County, Penn Hills
- Measured
- 0.75 in hail
- Reported by
- EMERGENCY MANAGER
- Coordinates
- 40.500, -79.820
Thunderstorm Wind, Allegheny
- When
- April 22, 12:00 AM EST
- Where
- Allegheny County, Edgeworth to Edgewood
- Measured
- 50 kt (58 mph)
- Property damage
- $3,000
- Reported by
- EMERGENCY MANAGER
- Coordinates
- 40.570, -80.220
Thunderstorm winds downed several large trees.
Thunderstorm Wind, Beaver
- When
- April 22, 12:00 AM EST
- Where
- Beaver County, Independence
- Measured
- 50 kt (58 mph)
- Property damage
- $1,000
- Reported by
- EMERGENCY MANAGER
- Coordinates
- 40.570, -80.320
A large tree was blown down by thunderstorm winds.
Flash Flood, Allegheny
- When
- April 22, 12:30 AM EST to 1:30 AM EST
- Where
- Allegheny County, Pittsburgh
- Reported by
- EMERGENCY MANAGER
- Coordinates
- 40.469, -79.981 (the zone’s center; the record gives no point)
Heavy thunderstorm rains produced minor road flooding across several Pittsburgh suburbs, including East Liberty, Monroeville, Fox Chapel, Millvale, Shaler and Etna.
Thunderstorm Wind, Westmoreland
- When
- April 22, 12:40 AM EST
- Where
- Westmoreland County, Trees Mills
- Measured
- 50 kt (58 mph)
- Property damage
- $3,000
- Reported by
- EMERGENCY MANAGER
- Coordinates
- 40.430, -79.550
Thunderstorm winds downed several trees.
Hail, Greene
- When
- April 23, 12:45 PM EST
- Where
- Greene County, Waynesburg
- Measured
- 2 in hail
- Reported by
- EMERGENCY MANAGER
- Coordinates
- 39.900, -80.200
Hail, Fayette
- When
- April 23, 1:10 PM EST
- Where
- Fayette County, Pt Marion
- Measured
- 2 in hail
- Reported by
- EMERGENCY MANAGER
- Coordinates
- 39.730, -79.920
What these are
- Hail
- Hail three-quarters of an inch or larger, or smaller hail that caused damage, filed with the largest stone measured.
- 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.
- Flash Flood
- Flooding that begins within six hours of the rain that causes it, or of a dam or levee failure or ice jam release, often with deadly speed.
After NWS Directive 10-1605, the rules offices file Storm Data by.
The same day elsewhere
- Tornadoes and Hail in Oklahoma, April 21 to 22, 1999
- Tornadoes and Hail in Nebraska, April 21, 1999
- Hail and Damaging Winds in Kansas, April 21 to 22, 1999
- Dust Storm in California, April 21 to 22, 1999
- Lightning Strike in Missouri, April 21, 1999
- Hail and Damaging Winds in Oklahoma, April 21 to 22, 1999
- Flooding and Hail in Kansas, April 21 to 22, 1999
- Heavy Snow in Colorado, April 21 to 23, 1999
- Hail and Damaging Wind in Illinois, April 21, 1999
- Winter Storm in Colorado, April 21 to 22, 1999
- Hail in Ohio, April 21 to 23, 1999
- Damaging Winds in Illinois, April 21 to 22, 1999
More
Every storm in Pennsylvania in 1999Every state in 1999This day in weather historyWarnings in Pennsylvania, April 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: 5690714, 5690715, 5690716, 5690717, 5690718, 5690719, 5690720, 5690721, 5690722.