As of Friday morning, TS Andrea was near Charleston, SC, but racing to the northeast at 28 mph. This is very quick for a storm, and means it will move past Maryland tonight.
SUMMARY OF 500 AM EDT…0900 UTC…INFORMATION
ABOUT 30 MI…50 KM NE OF SAVANNAH GEORGIA
ABOUT 50 MI…80 KM SW OF CHARLESTON SOUTH CAROLINA
MAXIMUM SUSTAINED WINDS…45 MPH…75 KM/H
PRESENT MOVEMENT…NE OR 40 DEGREES AT 28 MPH…44 KM/H
MINIMUM CENTRAL PRESSURE…996 MB…29.41 INCHES
TS Andrea formed Wednesday afternoon, and so far has moved as expected, just over performed with peak winds of 65 mph at landfall Thursday evening. The track of the storm continues on a path towards Ocean City, but that is not the whole story. The storm is losing tropical characteristics. While it may still hold winds near the center of 40 mph as it arrives in the Mid Atlantic, it may be downgraded to a hybrid or extra tropical system. The difference is less warm air and a wider wind field.
Overall it was a good call for many schools to cancel outdoor activities as the worst conditions are expected to arrive mid day through evening.
See animation of the satellite loop this morning in the video below. Multiple perspectives show the circulation and movement well.
Forecast maps can be found in the slide show.
Much of central Maryland is more prone to coastal flooding from the sloshing on the Chesapeake Bay. Sothern Maryland and Virginia may be more likely to get flooding from the rainfall. However some flooded streets can be expected with the heavy stuff reaching metro DC and Baltimore this afternoon.
Flash Flooding is possible in some areas, especially those that were in the heavier rain bands on Thursday and have saturated ground. Generally we expect 2-3 inches of rain today. The heaviest band will be pushed north of the storm and reach Washington to Baltimore near or just after noon. This will last into the early evening, making travel rough. The rainfall should ease up as the storm passes north tonight.
Outlook into Saturday: Andrea will be gone, but more storms are possible. There will be more heat and dry weather returning on Sunday.
Tropical Storm force winds may be experienced on the lower Eastern Shore, but across the Chesapeake Bay wind will likely be in the 30 mph range. The direction from the east will pileup water on the western shore of the Bay, but similar to what you might experience in a Nor’Easter.
The hill tops north and west of Baltimore may also have 30 mph winds, but generally less intense farther west and north away from the storm.
There is always a small risk of twisters with a tropical system on shore. 10 tornadoes were confirmed in Florida with landfall on Thursday. A very small chance, roughly less than 5% in the southern Delmarva through Virginia Beach.
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Hurricane Preparedness Week: Storm Surge is the most deadly and destructive
Hurricane Destruction Animation based on Saffir Simpson Scale
NASA Global Hawk: Hurricane drone planes run by locals at Goddard
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