Tornado Watch: Critical Storm Threat Clears DC Region

Image Source: FOX 5 DC

Tornado watch alerts placed much of the Washington, D.C., region on guard Thursday as severe thunderstorms moved across the area. The storms brought heavy rain, dangerous wind gusts and the threat of hail, flash flooding and an isolated tornado.

According to FOX 5 DC and the National Weather Service, the most significant severe weather threat developed during the afternoon and evening along the Interstate 95 corridor, stretching from Virginia through Philadelphia. Temperatures climbed into the upper 80s before storms intensified.

Critical Tornado Watch Threatened the DC Region

The tornado watch remained in effect until 10 p.m. Thursday for a broad section of the region. Areas included Washington, D.C., Arlington, Prince William, Fairfax and Stafford counties in Virginia, as well as Montgomery and Prince George’s counties in Maryland.

A separate Severe Thunderstorm Watch covered Fauquier and Frederick counties. Forecasters emphasized that damaging wind gusts were the primary concern, although the storm system also had the potential to produce large hail, intense rainfall, flash flooding and an isolated tornado.

• Severe storms were expected mainly from the afternoon into the evening.
• Damaging wind gusts posed the greatest threat.
• Heavy downpours could trigger flash flooding in vulnerable areas.
• Hail and an isolated tornado were also possible.
• Residents were urged to monitor changing weather alerts.

Maryland Tornado Warnings Expire Thursday Evening

Two tornado warnings were issued for portions of St. Mary’s County, Maryland, as powerful storms crossed the area. One warning focused on California and Lexington Park, while another covered the Calloway area.

The warnings expired at approximately 7:30 p.m. Thursday, according to the National Weather Service. Even after warnings ended, residents were advised to remain alert because additional thunderstorms and heavy rain continued to move through parts of the region.

A tornado warning means a tornado has been detected or indicated by weather radar and that people in the affected area should take shelter immediately. A tornado watch is broader and means conditions are favorable for tornadoes and severe thunderstorms to develop.

What Residents Needed to Know

People in the storm zone were encouraged to move indoors when warnings were issued and stay away from windows. The safest location is an interior room on the lowest level of a sturdy building. Drivers were also urged to avoid flooded roads, where water depth can be difficult to judge.

Thursday morning began with temperatures in the 70s and a few scattered showers. By midday, readings had reached the mid-80s, with highs near 87 to 88 degrees expected. The combination of heat, humidity and an approaching weather system helped fuel the afternoon storms.

Cooler Friday Before More Weekend Rain

After the storm activity cleared Thursday night, Friday was expected to bring cooler and mostly drier conditions across the nation’s capital. An isolated thunderstorm could not be ruled out, but forecasters described Friday as one of the more comfortable and manageable days in the coming stretch.

Wet weather was forecast to return Saturday, potentially affecting outdoor activities and weekend events in Washington, D.C. Rain gear could be useful for visitors attending events such as the Freedom 250 Grand Prix race. Sunday was expected to be somewhat drier, with sunshine and more stable conditions returning early next week.

The latest outlook called for showers and thunderstorms before 9 p.m. Thursday, followed by patchy fog between approximately 10 p.m. and 2 a.m. Overnight skies were expected to remain mostly cloudy, with temperatures falling to around 67 degrees.

Stay Alert During Fast-Moving Storms

Severe weather can change quickly, particularly when thunderstorms are moving through a densely populated region. Residents should keep phones charged, review their shelter plans and follow guidance from local emergency officials and the National Weather Service.

The tornado watch and warnings described in this report were issued for Thursday, August 20, 2026. Conditions can vary significantly from one neighborhood to another, so people should rely on current alerts when making decisions about travel, outdoor plans and shelter.

Source: Information provided by the FOX 5 Weather Team and the National Weather Service.

Frequently Asked Questions

What is a tornado watch?

A tornado watch means atmospheric conditions are favorable for tornadoes and severe thunderstorms to develop. People should stay informed and be prepared to seek shelter if a warning is issued.

What is the difference between a tornado watch and warning?

A watch covers a larger area and signals a potential threat. A warning means a tornado has been detected or indicated by radar and people in the affected area should take shelter immediately.

Which Maryland area received tornado warnings?

Warnings were issued for parts of St. Mary’s County, including the California, Lexington Park and Calloway areas. The warnings expired around 7:30 p.m. Thursday.

What weather followed the storms?

Friday was expected to be cooler and mostly dry. Rain was forecast to return Saturday, while Sunday looked somewhat drier before improved conditions early the following week.