Severe Thunderstorm Warning Issued For 8 MD Counties

Updated at 5:18 p.m.

Flash flooding is possible again Tuesday in Maryland with another round of thunderstorms expected to soak the state. Extreme heat is also anticipated, as the real-feel temperature could top 100 degrees in some areas.

The National Weather Service issued a severe thunderstorm warning Tuesday afternoon that is in effect until 5:30 p.m. Areas in the warning area include parts of Anne Arundel, Howard, Montgomery, Baltimore, Prince George's, Harford County and Cecil counties, along with the city of Baltimore.

At 4:57 p.m. a severe thunderstorm was located over Columbia, moving east at 25 mph, capable of producing 70 mph wind gusts.

Another storm was spotted at 4:56 p.m. near Bel Air North, or 12 miles northwest of Aberdeen, moving northeast at 35 mph. The storm was producing 60 mph wind gusts.

"Damaging winds will cause some trees and large branches to fall. This could injure those outdoors, as well as damage homes and vehicles," the NWS said. "Roadways may become blocked by downed trees. Localized power outages are possible. Unsecured light objects may become projectiles.

Locations impacted include Baltimore, Columbia, Severn, Elkridge, Baltimore-Washington Airport,
Historic Ellicott City, Glen Burnie, Ellicott City, Catonsville, Woodlawn, Severna Park, Odenton, Laurel, Pasadena, Fairland, Arbutus, Ferndale, Brooklyn Park, Fort Meade, and Savage-Guilford.

This batch of showers comes one day after Tropical Storm Chantal remnants rolled through the state. Chantal has since cleared the area and dissipated.

"A hot and humid afternoon will lead to numerous thunderstorms developing which will move eastward through the evening," the National Weather Service said Tuesday on Facebook. "Storms will be capable of producing damaging wind gusts and heavy rain that may lead to flash flooding."

The flood watch runs through 11:59 p.m. Tuesday and covers Baltimore City and these counties: Cecil, Harford, Baltimore, Carroll, Howard, Montgomery, Anne Arundel, Prince George's, Calvert, Charles, St. Mary's, Kent, Queen Anne's, Caroline and Talbot.

"Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Flooding may occur in poor drainage and urban areas," the flood watch said. "Numerous showers and thunderstorms will move across the area this afternoon and evening. Rainfall rates of up to 2 inches per hour are possible, which may lead to scattered instances of flash flooding where the heavy rain persists the longest. Please visit www.weather.gov/safety/flood for flood safety and preparedness information."

AccuWeather says scorching daytime weather will be met with showers, thunderstorms and localized severe storms between New England and the Carolinas on Tuesday. Forecasters said Maryland's Eastern Shore, southeastern New York and southwestern Connecticut face a moderate risk of severe storms "due to the greater concentration of storms capable of triggering major travel disruptions from powerful wind gusts and torrential downpours."

The remnants of Chantal hit the region following disastrous rainfall and flooding the storm caused in southern states. Heavy rainfall swamped the coast, dumping nearly a foot of rain on much of North Carolina before veering north.

The storm is massive, and another bout of severe rainfall is expected to slam the region again on Wednesday afternoon and evening, according to the National Weather Service.

"Moving forward through the middle and latter parts of this week, the main threat from the ongoing, nearly daily rounds of thunderstorms in some areas will be flash flooding, especially where it rained hard the day before, saturated the ground and pushed small stream levels up," Accuweather added.

The heat advisory calls for heat index values up to 106. The advisory runs until 7 p.m. Tuesday. It covers Baltimore City, the entire Delmarva Peninsula and these counties: Cecil, Harford, Baltimore, Anne Arundel, Prince George's, Calvert, Charles and St. Mary's.

"Hot temperatures and high humidity may cause heat illnesses," the heat advisory said. "Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1."

There's a chance of thunderstorms daily through at least Monday, with each day having a high around 90.

"Patchy fog may develop after storms end tonight," the National Weather Service said in a forecast. "Another round of strong to severe storms with heavy rain is likely Wednesday. Unsettled weather with daily thunderstorm chances will continue the remainder of the week as a front remains stalled nearby."

Here is the NWS's seven-day forecast at Baltimore/Washington International Thurgood Marshall Airport:

Tuesday: Showers and thunderstorms likely, then showers and possibly a thunderstorm after 5pm. High near 95. Heat index values as high as 104. Calm wind becoming south 5 to 7 mph in the afternoon. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

Tuesday Night: Showers and thunderstorms likely, mainly before 11pm. Mostly cloudy, with a low around 73. Light and variable wind. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Wednesday: A chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 91. Calm wind becoming south around 5 mph in the afternoon. Chance of precipitation is 50%.

Wednesday Night: A chance of showers and thunderstorms before 5am, then a slight chance of showers. Mostly cloudy, with a low around 72. Light southwest wind. Chance of precipitation is 50%.

Thursday: A chance of showers, then showers and thunderstorms likely after 11am. Mostly cloudy, with a high near 88. Calm wind becoming south around 6 mph in the afternoon. Chance of precipitation is 70%.

Thursday Night: Showers likely and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms between 8pm and 2am. Mostly cloudy, with a low around 71. Chance of precipitation is 60%.

Friday: A chance of showers between 8am and 2pm, then a chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 90. Chance of precipitation is 50%.

Friday Night: A chance of showers and thunderstorms before 2am. Mostly cloudy, with a low around 72. Chance of precipitation is 30%.

Saturday: A chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 90. Chance of precipitation is 50%.

Saturday Night: A chance of showers and thunderstorms before 8pm, then a chance of showers between 8pm and 2am. Mostly cloudy, with a low around 73. Chance of precipitation is 30%.

Sunday: A chance of showers and thunderstorms. Partly sunny, with a high near 89. Chance of precipitation is 50%.

Sunday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 72. Chance of precipitation is 30%.

Monday: A chance of showers and thunderstorms. Partly sunny, with a high near 89. Chance of precipitation is 50%.