Heavy Rain, Loudoun
- When
- August 25, 12:00 PM EST to 5:00 PM EST
- Where
- Loudoun County, East Portion
- Reported by
- AWOS,ASOS,MESONET,ETC
- Coordinates
- 39.091, -77.636 (the zone’s center; the record gives no point)
Heavy Rain in Virginia, August 25, 1999
0 inches of rain. 75 inches.
Where it happened
Every event with a place to put it; 3 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
- 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.
Slow moving thundershowers crossed Loudoun and Fairfax Counties during the afternoon and early evening, dropping between 1.5 and 3.0 inches of rain. Measurements included Dulles International Airport at 3.03 inches, Sterling at 2.93 inches, Occoquan at 2.05 inches, Herndon at 1.88 inches, and Vienna at 1.75 inches. Most of the rain ran off into low lying areas because drought conditions made the soil so dry. The standing water led to minor street flooding. Lightning caused 5000 customers in Northern Virginia to lose power. Another slow moving shower crossed Highland County, dropping 2.50 inches of rain near Williamsville.
The radar
The national radar mosaic for the moment the first event began.
Event by event
3 heavy rain. Local standard time, as filed.
Heavy Rain, Fairfax
- When
- August 25, 12:00 PM EST to 5:00 PM EST
- Where
- Fairfax County, South Portion
- Reported by
- AWOS,ASOS,MESONET,ETC
- Coordinates
- 38.835, -77.276 (the zone’s center; the record gives no point)
Heavy Rain, Highland
- When
- August 25, 12:00 PM EST
- Where
- Highland County, 2 mi SW of Patna
- Reported by
- NEWSPAPER
- Coordinates
- 38.362, -79.568 (the zone’s center; the record gives no point)
What these are
- Heavy Rain
- Rainfall totals unusual for the place and season that did not produce a flood.
After NWS Directive 10-1605, the rules offices file Storm Data by.
The same day elsewhere
- Lightning Strike in Mississippi, August 25, 1999
- Flash Flooding and Heavy Rain in Maryland, August 25, 1999
- Damaging Wind and Lightning Strike in Virginia, August 25, 1999
- Hail and Damaging Winds in Mississippi, August 25, 1999
- Lightning Strike in Florida, August 25, 1999
- Heavy Rain in Pennsylvania, August 25 to 26, 1999
- Flash Flooding and Hail in North Carolina, August 25, 1999
- Hail in Georgia, August 25, 1999
- Heavy Rain in Maryland, August 25, 1999
- Heavy Rain in New Jersey, August 25 to 26, 1999
- Drought in North Carolina, August 25, 1999
- Wildfire in Oregon, August 25, 1999
More
Every storm in Virginia in 1999Every state in 1999This day in weather historyWarnings in Virginia, 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: 5718772, 5718773, 5718774.