Marco sets a new record for the Atlantic
Tropical Storm Marco was the smallest tropical storm on record in the Atlantic. Records of tropical storm size only go back to 1988, so it is likely there have been other tropical storms as small as Marco in the past, though. If one looks at the maximum area covered by tropical storm force winds (in nautical miles squared, nm^2), given the radius of these winds for all four quadrants of each storm, here are the top 5 smallest storms in the Atlantic:

1) Marco, 2008, 1158 nm^2
2) Henri, 2001, 2238 nm^2
3) Bertha, 2002, 2827 nm^2
3) Bret, 2005, 2827 nm^2
3) Unnamed, 2006, 2827 nm^2

At Marco's peak size, tropical storm-force winds extended out 25, 15, 0, and 25 nm in its four quadrants. This means Marco covered an area of about 1,158 square nautical miles, which is slightly smaller than Rhode Island's area of 1,162 nm^2. Marco was about 1/75 as large as Ike at its peak, and 1/500 as big as the record holder, Tropical Storm Olga of 2001 (591000 nm^2, three times the size of Texas).

No casualties or damage were reported from Marco's landfall. The storm dumped up to six inches of rain along a 30-mile stretch of coast, according to satellite estimates