The National Weather Service has issued a Tornado Watch for Calvert and St. Mary's Counties effective until 4 a.m. on Thursday, May 7. A tornado watch means that the atmospheric conditions are favorable for the formation of tornados.

COASTAL WATERS FORECAST
NATIONAL WEATHER SERVICE WAKEFIELD VA
940 PM EDT WED MAY 6 2009

VIRGINIA PORTION OF THE CHESAPEAKE BAY...CURRITUCK SOUND AND ATLANTIC
COASTAL WATERS FROM FENWICK ISLAND DE TO CURRITUCK BEACH LIGHT NC OUT
20 NAUTICAL MILES

ANZ654-656-070915-
COASTAL WATERS FROM PARRAMORE ISLAND TO CAPE CHARLES LIGHT VA OUT 20 NM-
COASTAL WATERS FROM CAPE CHARLES LIGHT VA TO NC VA BORDER OUT 20 NM-
940 PM EDT WED MAY 6 2009

...SMALL CRAFT ADVISORY IN EFFECT THROUGH THURSDAY AFTERNOON...
...TORNADO WATCH 257 IN EFFECT UNTIL 4 AM EDT THURSDAY...