Marylanders braced for another day of possible flash flooding and excessive rainfall in what meteorologists say is a wetter-than-usual July.

The National Weather Service put Baltimore and Carroll counties under a tornado warning until 9 p.m. Wednesday.

Baltimore City and Anne Arundel, Baltimore, Carroll, Cecil, Frederick, Harford, Howard, Montgomery and Prince George’s counties remained under flood watch from 5 p.m. Wednesday throughout the evening, the Baltimore/Washington field office of the National Weather Service said.

NWS said 1-3 inches of rain could fall per hour due to showers and thunderstorms.

As the storms rolled through the region Wednesday, a tree fell on a vehicle in the 3500 block of Perry Avenue in Kensington, igniting a fire, downing power lines and blocking a road. Montgomery County Fire & Rescue crews responded.

Officials also issued a hazardous weather outlook for the Maryland portion of the Chesapeake Bay, Interstate 95 corridor and Tidal Potomac River Wednesday ahead of potential flooding.

Temperatures Wednesday could linger from 80 to 95 degrees with a heat index value as high as 103. Severe weather may cause about 25-minute delays on the Maryland Area Rail Commuter system’s Camden, Brunswick and Penn lines, the Maryland Transit Administration said.

So far, 23 inches of rain have showered the Baltimore region, compared to 22 inches around this time last year, Luis Rosa, an NWS meteorologist said. Rainfall this month, though, has been higher than normal, Rosa added.

Baltimore typically sees 2 inches of rainfall in July, Rosa said, and the area has already gotten nearly twice that amount just halfway through the month. And there’s no sign of the precipitation letting up. NWS forecasts showers and thunderstorms through next Tuesday.

Wednesday’s likelihood of extreme weather follows Monday’s storms, when a heavy downpour across the Baltimore region flooded some areas and put the city at a level 3 of 4 for “a moderate risk” of excessive rainfall.

The month began with downed power lines, transit suspensions and delays, and a church fire caused by a lightning strike amid flash flooding and heavy rain.

Extreme heat alert issued for Baltimore

Ahead of high temperatures and a heat index predicted to reach 105 degrees, the Baltimore City Health Department declared a Code Red Extreme Heat Alert for Thursday.

Mary Beth Haller, the city’s interim commissioner of health, urged residents, including those who are older, children, first responders, front-line workers or with preexisting health conditions, to hydrate, avoid strenuous activity and stay in shaded or air-conditioned spaces.

The following cooling centers will be available Thursday:

• Beans & Bread: 400 S. Bond St., 9 a.m. - 4 p.m.
• Brooklyn Homes: 4140 10th St., 8 a.m. - 4 p.m.
• Cherry Hill Homes: 2700 Spelman Rd., 8 a.m. - 4 p.m.
• Franciscan Center: 101 W. 23rd St., 10 a.m. - 1 p.m.
• Harford Senior Center: 4920 Harford Rd., 9 a.m. -7 p.m.
• Hatton Senior Center: 2825 Fait Ave., 9 a.m. - 7 p.m.
• Manna House: 435 E. 25th St., 11:30 a.m. - 3 p.m.
• My Sister’s Place Women’s Center: 17 W. Franklin St., 10:30 a.m. - 5:30 p.m.
• Oliver Senior Center: 1700 N. Gay St., 9 a.m. - 7 p.m.
• Sandtown-Winchester Senior Center: 1601 Baker St., 9 a.m. - 7 p.m.
• ShopRite of Howard Park: 4601 Liberty Heights Ave., 6 a.m. - 10 p.m.
• Weinberg Housing Resource Center: 620 Falls Way, 11 a.m. - 5 p.m.
• Zeta Senior Center: 4501 Reisterstown Rd., 9 a.m. - 7 p.m.
• Zion Lutheran Church: 400 E. Lexington St., 11 a.m. - 5 p.m.

“During these extremely hot days, we urge all employees and residents to take this alert seriously. Pay close attention to the weather, listen to your body, and drink plenty of water to stay hydrated,” Mayor Brandon M. Scott said in a news release. “Whether it’s checking in on neighbors, staying indoors during the hottest part of the day, or using our cooling centers, we all play a part in helping everyone remain as safe as possible.”