Thunderstorm Wind, Frederick
- When
- July 18, 5:48 PM EST
- Where
- Frederick County, Monrovia
- Property damage
- $2,000
- Reported by
- EMERGENCY MANAGER
- Coordinates
- 39.370, -77.270
Tree limbs downed on power lines
Damaging Winds in Maryland, July 18, 1999
A line of thunderstorms moved across North Central Maryland between 6:30 PM EDT and 7:15 PM EDT, producing gusty winds, heavy downpours, and frequent lighting. As the storms moved through southeast Frederick County and southwest Carroll County strong winds knocked tree limbs onto power lines.
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
- $6,000
- Crop damage
- None recorded
- Events
- 3
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 LWX wrote it up.
A line of thunderstorms moved across North Central Maryland between 6:30 PM EDT and 7:15 PM EDT, producing gusty winds, heavy downpours, and frequent lighting. As the storms moved through southeast Frederick County and southwest Carroll County strong winds knocked tree limbs onto power lines. 2,000 customers in the area lost power as a direct result of the storm.
The radar
The national radar mosaic for the moment the first event began.
Event by event
3 thunderstorm wind. Local standard time, as filed.
Thunderstorm Wind, Frederick
- When
- July 18, 5:50 PM EST
- Where
- Frederick County, New Market
- Property damage
- $2,000
- Reported by
- EMERGENCY MANAGER
- Coordinates
- 39.380, -77.270
Tree limbs downed on power lines
Thunderstorm Wind, Carroll
- When
- July 18, 5:52 PM EST
- Where
- Carroll County, Mt Airy
- Property damage
- $2,000
- Reported by
- EMERGENCY MANAGER
- Coordinates
- 39.380, -77.150
Tree limbs downed on 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
- Heat in Missouri, July 18 to 31, 1999
- Heat in Missouri, July 18 to 31, 1999
- Heat in Illinois, July 18 to 31, 1999
- Heat in Illinois, July 18 to 31, 1999
- Flash Flooding in Iowa, July 18 to 19, 1999
- Heat in Kentucky, July 18 to 31, 1999
- Heat in Missouri, July 18 to 31, 1999
- Heat in Kansas, July 18 to 31, 1999
- Lightning Strike in Texas, July 18, 1999
- Flash Flooding and Damaging Winds in Iowa, July 18 to 19, 1999
- Flash Flood in Minnesota, July 18, 1999
- Hail and Damaging Winds in New York, July 18, 1999
More
Every storm in Maryland in 1999Every state in 1999This day in weather historyWarnings in Maryland, 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: 5711583, 5711584, 5711585.