Tornado, Montgomery
- When
- August 20, 6:50 AM EST
- Where
- Montgomery County
- Rating
- F1
- Path length
- 0.8 mi
- Path width
- 73 yd
- Property damage
- $25,000
- Coordinates
- 39.180, -77.030
Tornado and Hail in Maryland, August 20, 1991
8 thunderstorm wind, 1 tornado, 1 hail, 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
- $25,000
- Crop damage
- None recorded
- Events
- 10
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.
Event by event
8 thunderstorm wind, 1 tornado, 1 hail. Local standard time, as filed.
Hail, Montgomery
- When
- August 20, 6:30 AM CST
- Where
- Montgomery County
- Measured
- 1 in hail
- Coordinates
- 39.170, -77.020
Thunderstorm Wind, Montgomery
- When
- August 20, 7:10 AM CST
- Where
- Montgomery County
- Coordinates
- 39.120, -77.120
Thunderstorm Wind, Howard
- When
- August 20, 7:30 AM CST
- Where
- Howard County
- Coordinates
- 39.230, -76.980
Thunderstorm Wind, Harford
- When
- August 20, 7:30 AM CST
- Where
- Harford County
- Coordinates
- 39.530, -76.350
Thunderstorm Wind, Harford
- When
- August 20, 7:30 AM CST
- Where
- Harford County
- Coordinates
- 39.580, -76.530
Thunderstorm Wind, Baltimore
- When
- August 20, 8:30 AM CST
- Where
- Baltimore County
- Measured
- 65 kt (75 mph)
- Coordinates
- 39.500, -76.470
Thunderstorm Wind, Frederick
- When
- August 20, 4:45 PM CST
- Where
- Frederick County
- Coordinates
- 39.470, -77.380
Thunderstorm Wind, Washington
- When
- August 20, 4:45 PM CST
- Where
- Washington County
- Coordinates
- 39.620, -77.770
Thunderstorm Wind, Carroll
- When
- August 20, 5:20 PM CST
- Where
- Carroll County
- Coordinates
- 39.550, -77.100
What these are
- Tornado
- A violently rotating column of air in contact with the ground and extending from a thunderstorm, filed with its path, width and Fujita or Enhanced Fujita rating from the damage survey.
- 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.
After NWS Directive 10-1605, the rules offices file Storm Data by.
The same day elsewhere
- Tornado in Ohio, August 20, 1991
- Damaging Winds in New Jersey, August 20, 1991
- Damaging Winds in Pennsylvania, August 20, 1991
- Hail and Damaging Wind in Texas, August 20, 1991
- Hail and Damaging Winds in Oregon, August 20, 1991
- Hail and Damaging Winds in Oklahoma, August 20, 1991
- Tornado in North Carolina, August 20, 1991
- Damaging Wind in Kansas, August 20, 1991
More
Every storm in Maryland in 1991Every state in 1991This day in weather historyThe tornado archive for Maryland, 1991Warnings in Maryland, August 1991
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: 10038098, 10038097, 10038099, 10038100, 10038101, 10038102, 10038103, 10038104, 10038105, 10038106.