The National Weather Service (NWS) is reporting a Flash Flood Watch for much of Maryland (including the areas I write about: Carroll County and Howard County) from this afternoon through tomorrow morning. Here are the details:
(Areas in Green are under the Flash Flood Watch)
…FLASH FLOOD WATCH REMAINS IN EFFECT FROM THURSDAY AFTERNOON THROUGH FRIDAY MORNING…
The Flash Flood Watch continues for
* Portions of DC, Maryland and Virginia, including the following areas: in DC, District of Columbia. In Maryland, Anne Arundel, Calvert, Carroll, Cecil, Central and Southeast Howard, Central and Southeast Montgomery, Charles, Frederick MD, Northern Baltimore, Northwest Harford, Northwest Howard, Northwest Montgomery, Prince Georges, Southeast Harford, Southern Baltimore and St. Marys. In Virginia, Albemarle, Arlington/Falls Church/Alexandria, Culpeper, Eastern Loudoun, Fairfax, Greene, King George, Madison, Northern Fauquier, Orange, Prince William/Manassas/Manassas Park, Rappahannock, Southern Fauquier, Spotsylvania, Stafford and Western Loudoun.
* From Thursday afternoon through Friday morning.
* Several rounds of thunderstorms are expected Thursday afternoon through early Friday morning with localized rainfall rates of up to 1-2 inches per hour possible. Total rainfall amounts of 1-3 inches, with locally higher amounts up to 4 inches are possible.
* Heavy rain in short periods of time will cause the potential for streams and creeks to quickly rise out of their banks as well as the potential for flash flooding in urban areas.
You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued.
The NWS Baltimore-Washington Twitter account just posted this tweet a little bit ago:
An active weather day across this region with multiple rounds of showers/thunderstorms expected. Portions of the area are in a Slight Risk for severe thunderstorms, while others are in a Flash Flood Watch. Stay weather ready and be prepared to take shelter if a storm approaches.
Here is the forecast for the next few days from the NWS for my area in Carroll County:
Thursday: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 11am. Some of the storms could produce heavy rain. High near 83. Calm wind becoming west around 5 mph in the afternoon. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
Thursday Night: Showers and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms after 8pm. Some of the storms could produce heavy rain. Low around 67. Southwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Friday: A chance of showers and thunderstorms before 8am, then a chance of showers between 8am and 11am, then a chance of showers and thunderstorms after 11am. Cloudy, then gradually becoming mostly sunny, with a high near 79. Northwest wind 5 to 8 mph. Chance of precipitation is 50%.
Friday Night: A chance of showers and thunderstorms. Mostly clear, with a low around 59. Northwest wind around 6 mph. Chance of precipitation is 30%.
Saturday: A chance of showers, then showers likely and possibly a thunderstorm after 2pm. Mostly sunny, with a high near 75. Chance of precipitation is 60%.
Saturday Night: Showers and thunderstorms likely before 11pm, then a chance of showers between 11pm and 2am. Partly cloudy, with a low around 59. Chance of precipitation is 60%.