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Flash Flood Warnings for northwest suburbs

The National Weather Service has posted Flash Flood Warnings (dark red on map) for portions of Carroll, Baltimore and Harford counties, effective until 1:30 p.m. Thursday.

(Click here for updated watches and warnings.)

The warnings come on top of the Tornado Watch (yellow) that remains in effect west of the Chesapeake Bay and the Severe Thunderstorm Warning (orange) in parts of Southern Maryland.

That storm triggered a Tornado Warning in northern Virginia. that has since expired.

Here's the radar loop from Sterling.

Forecasters say they expect the worst of the storm threats will be out of the region by "mid-afternoon" as the cold front passes by.

Stream flooding and road closures in Maryland are already being reported from Antietam Creek in Leitersburg, Washington County. More flooding is reported from Emmitsburg, in northern Frederick County; also in Libertytown, Cavetown, Ballenger Creek. Trees are reported down in Barnesville and Bealesville, in Montgomery County. 

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