Update: 7:55 p.m., June 22:

The National Weather Service has extended a severe thunderstorm warning for Montgomery County until 8:30 p.m.

Update, 6:30 p.m., June 22:

The National Weather Service has issued a severe thunderstorm warning, in effect for Montgomery County until 7 p.m.

Original, 3:17 p.m., June 22:

After several days of intense summer heat, Montgomery County residents may be in for heavy rain and strong winds on Friday evening.

The National Weather Service has issued a severe thunderstorm watch, in effect until 9 p.m. Friday, for central and western Maryland.