THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA HAS ISSUED A

* TORNADO WARNING FOR...
  BALTIMORE COUNTY IN NORTHERN MARYLAND...
  HARFORD COUNTY IN NORTHERN MARYLAND...

* UNTIL 300 PM EDT

UPDATE: Extended to 3:30 p.m. Western Talbot and southwestern Queen Anne's County were also added to the tornado warning area.

Clay Stamp, emergency manager for Talbot County, said he had received no damage reports. "We had reports of what we think was a waterspout coming across the Choptank. It moved onto Oxford and dissipated." Elsewhere, he said, "The sky looked bad, but there was no rotation." 

Here's the earlier warning:

* AT 226 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR
  KINGSVILLE...OR 7 MILES SOUTHWEST OF BEL AIR...MOVING NORTHWEST AT
  25 MPH.

* LOCATIONS IMPACTED INCLUDE...
  JARRETTSVILLE...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING AND AVOID WINDOWS. IF OUTDOORS OR IN A MOBILE HOME OR
VEHICLE...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.

A tornado was also reported Tuesday night by a trained observer in Maugansville, in Washington County. "LARGE TREES DOWN AND SHINGLES OFF ROOF...," he said in a NWS report. No confirmation yet from weather service surveyors. I guess they're a bit busy today.

A Flash Flood Warning has also been issued for eastern Baltimore County and western Harford County as the same thunderstorm moves north and west along the county line. Details follow on the jump. The entire region is under a Severe Thunderstorm Watch: