UPDATE, 3:50 p.m.: Severe storm warnings for Harford and Baltimore counties have been cancelled. Severe storm watches remain in effect across the region. Here's a map that will provide current watches and warnings.

EARLIER: Baltimore and Harford counties are under severe storm warnings this afternoon as thunderstorms roll in ahead of a cold front from the north and west. The rest of the region is under a severe storm watch. Here is the latest forecast. Here is the current storm warning. And here is the local radar. For a wider view, click here.

Where's the lightning? Check here.

Here's how Sterling puts it:

STRONG THUNDERSTORMS ARE EXPECTED TO DEVELOP ALONG THE BLUE RIDGE
AND ACROSS THE BALTIMORE METRO AREA DURING THE MID
AFTERNOON...BRINGING A BRIEF HEAVY RAIN...DANGEROUS CLOUD TO GROUND
LIGHTNING...AND THE THREAT OF LOCALLY DAMAGING WIND GUSTS. THIS
ACTIVITY IS FORECAST TO MOVE SOUTHEAST ACROSS THE WASHINGTON DC
METRO AREA...INTERSTATE 95 CORRIDOR AND INTO LOWER SOUTHERN MARYLAND
DURING THE DINNER TIME HOURS.

And here are some severe weather safety rules to keep in mind. Be careful out there.