Flash Flood Watch Issued; Heavy Rain Possible

Posted at 4:20 p.m.

The National Weather Service (NWS) has issued a flash flood watch in effect from 6 p.m. this evening, Wednesday, Sept. 28, through Friday morning, Sept. 30.

A powerful low pressure system over the midwest will bring periods of heavy rain to our area tonight through Thursday night. NWS reports that widespread rainfall is expected with localized spots potentially getting up to a foot of rain. NWS notes that we should expect rain beginning this afternoon and continuing through Friday afternoon; heaviest amounts are expected to occur between midnight tonight and Thursday.

Precautions and Actions

These next few days will require more than the usual awareness, planning and preparations.

  • If you are near streams or drainage ditches, keep an eye on them and be ready to quickly seek higher ground. Water may rise rapidly.
  • Clear out storm drains and gutters to ensure that they are not clogged.
  • Those prone to basement flooding should prepare. Move items off basement floors and consider moving valuables to an upper level of your home.
  • Communities prone to flooding should prepare. Move vehicles to higher elevations. Don’t park in restricted areas and try to avoid parking under trees when possible.
  • Be prepared to take action if a warning is issued for where you are or if flooding is observed.

Continue to check in on the forecast for updates. Warnings will be issued for areas where flooding is imminent. Ensure that you get warnings from the National Weather Service through your mobile phone and or NOAA weather radio. Sign up for severe weather alerts from Fairfax Alerts.

With all high-intensity rainfall, street flooding is possible. If there is any possibility of a flash flood:

    • Move immediately to higher ground.
    • Do not wait for instructions to move.
    • Be aware of streams, drainage channels and other areas known to flood suddenly.
    • Flash floods can occur in these areas with or without such typical warnings as rain clouds or heavy rain.

Turn Around Don't Drown

And please remember to keep children away from creeks and their potentially rapidly rising waters.

In addition, remember if you experience water on roads, Turn Around. Don’t Drown. A mere 6 inches of fast-moving flood water can knock over an adult. And it takes just 12 inches of rushing water to carry away a small car, while 2 feet of rushing water can carry away most vehicles. It is never safe to drive or walk into flood waters.


Blocked stormdrains prevent the flow of rain from reaching streams and stormwater detention ponds. The water then backs up into streets and yards and may flood basements. Blocked stormdrains also may damage residential and commercial property and cause traffic delays.

Keep the openings of storm drains clear of debris to help alleviate potential flooding and to protect the environment. At no time should you attempt to enter a storm drain to remove debris.

Property owners are responsible for driveway culverts and bridges that are part of the driveway structure and are not public storm drainage system structures. Storm drains outside rights-of-way and easements are privately maintained by the property owner.

To report a blocked storm drain, call Fairfax County Stormwater Management, 703-877-2800, TTY 711, or the Virginia Department of Transportation at 703-383-8368, TTY 711.


About Fairfax County Emergency Information

Official emergency information about preparedness, response and recovery from Fairfax County Government.

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