Scattered thunderstorms that developed across North Central Virginia moved across the Potomac River and across extreme South Central Maryland between 1:30 PM and 3:30 PM EDT. These storms produced winds in excess of 55 MPH, frequent lightning, and heavy downpours.
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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 episode as NWS LWX wrote it up.
Scattered thunderstorms that developed across North Central Virginia moved across the Potomac River and across extreme South Central Maryland between 1:30 PM and 3:30 PM EDT. These storms produced winds in excess of 55 MPH, frequent lightning, and heavy downpours. The storms moved across the southern portion of Charles County between 1:30 PM and 2:00 PM EDT. Severe winds downed trees in Charlotte Hall, Faulkner, Newburg, Tompkinsville, and Rock Point. Electrical wires were also downed in Issue and Cobb Island. In addition, lightening struck electrical transformers in Issue and White Plains. Severe winds moved through Calvert County between 2:00 PM and 2:45 PM EDT. Trees and power lines were downed in St. Leonard. Trees and power lines were also toppled in Lusby, and one home in the Chesapeake Ranch Estates area suffered damage when an uprooted tree fell on the structure. The storms also damaged property near Mechanicsville in St. Mary's County around 3:00 PM EDT, resulting in $22,000 in losses. Severe winds ripped one barn in two, destroying half of the structure and throwing debris in a circular pattern nearby. Nails were popped on a second barn, and moderate damage was reported to two other barns. Sheep were killed by flying debris. A window was blown in on a home and a tree landed on the roof of a farm house. Hail accompanied the storm and the high winds lasted for 4 minutes. At 2:55 PM EDT a 61 MPH wind gust was recorded at Patuxent Naval Air Station.
The Sterling radar (KLWX), 76 km away, was scanning. The volume nearest the first event began at 17:30 UTC.
5 thunderstorm wind. Local standard time, as filed.
Trees downed in Charlotte Hall, Faulkner, Newburg, Tompkinsville, and Rock Point
Trees and power lines downed
Trees an power lines downed, a fallen tree damaged a home
Damage to 4 barns and a home, sheep killed by flying debris
Measured 61 MPH gust at Patuxent Naval Air Station
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Maryland in 1999Every state in 1999This day in weather historyWarnings in Maryland, July 1999
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: 5709952, 5709953, 5709954, 5709955, 5709956.