Tropical Storm Ana was the first named storm of the 1991 Atlantic hurricane season. Ana developed on July 2 off the coast of Georgia. Ana headed east-northeast, then eastward out to sea and away from any land areas. Ana dissipated on July 5.
Ana caused no damage and no deaths.
|Formation||July 2, 1991|
|Dissipation||July 5, 1991|
|Highest winds||50 mph|
|Lowest pressure||1000 mbar|
|Part of the||1991 Atlantic hurricane season|
Ana is believed to have originated from a low that was centered about 275 miles east of Jacksonville, Florida at 1200 UTC June 25. During this time, a frontal zone was oriented east to west near 30°N, and an upper-level anticyclone was centered over northern Florida. Over the next several days, the low tracked anticyclonically toward the Bahamas. By 1200 UTC June 29, a small surface low was evident within a trough draped across the northern Bahamas. The trough, along with the associated surface low, continued moving westward across southern Florida, then northward along Florida's west coast, and then finally northeastward toward St. Augustine by 0000 UTC July 2. At around 1200 UTC that day, as the low emerged into the Atlantic Ocean, it was too weak to classify via the Dvorak technique, but by 1800 UTC that day, the low began to organize, at which time the low is estimated to have become a tropical depression while located around 85 miles south of Charleston, South Carolina. Within 12 hours of forming, the cyclone began to accelerate northeast while remaining offshore the East Coast of the United States and also while remaining parallel to the coasts of South and North Carolina. At 1600 UTC July 3, a reconnaissance aircraft reached the cyclone, but found only a weak surface circulation with a 1008 mb pressure. Later that day, however, NOAA buoy 41001 reported an 8 minute sustained surface wind of 33 knots at 1900 UTC that day, along with a pressure of 1005 mb. Based on this, the depression is estimated to have become Tropical Storm Ana at 2000 UTC July 3.
After forming, Ana began accelerating to the east-northeast near 25 knots while approaching a quasi-stationary east-west oriented frontal zone. At 0900 UTC July 4, a ship located about 20 miles south of the center reported surface winds of 50 mph. Ana continued moving eastward, and by 1800 UTC July 5, became extratropical over the north Atlantic Ocean.
Lack of Retirement
Because it did not affect land, the name Ana was not retired in the Spring of 1992 by the World Meteorological Organization. It was used again during 1997 and 2003, and will be used again during 2009.