UPDATED: Tornado Watch Until 4 in Fairfax City, Surrounding Towns

UPDATE (12:47 p.m.): NWS has canceled the tornado watch. Heavy rain and thunderstorms still in the forecast.

Don't expect to see the sun until tomorrow. Monday's forecast calls for heavy rain all day and all night. And let's not forget the possibility of thunderstorms and tornadoes.

The National Weather Service urges Fairfax City residents to keep an eye on the sky (and television reports, radio updates and Fairfax City Patch posts, of course) until 4 p.m. today for a regional tornado watch.

You can prepare for severe weather, including high winds, cloud-to-ground lightning and hail, by staying indoors. Stay alert when driving home from work this afternoon.

If a tornado warning is issued, take shelter in the lowest level of your home, away from all windows. More tips on what to do in case of a tornado can be found here.