On May 30, a large low pressure area formed in the Gulf of Honduras. The system slowly became stronger as it moved through the northwest Caribbean Sea into the southeast Gulf of Mexico. On June 1, the first day of the Atlantic hurricane season, this cyclone organized into Tropical Storm Barry, even thought it was in an area of high wind shear. Warnings were immediately issued along the Western Florida coastline. Barry gave much-needed rain to parts of Florida and Georgia which were experiencing drought conditions from January to May. Barry made landfall near Tampa Bay, Florida on June 2 as a weak tropical storm. Shortly after, Barry weakened into a tropical depression as it became an extratropical storm. On June 3, the cyclone moved up the coast of the Carolinas bringing rains into the Mid-Atlantic states and New England. By June 5 its center had moved northward into Eastern Canada.
An area of low pressure area formed near the Bahamas on July 28, and slowly organized while moving to the north-northeast. Late on July 30, it was upgraded to a tropical depression, the third of the season, after developing deep convection near the center for most of the day. On July 31, the system strengthened into a tropical storm south of Nova Scotia, the first storm in nearly two months after Barry. The storm quickly became extratropical late that day though as it moved towards Newfoundland over the cooler waters of the north Atlantic.
On August 1, flooding was reported from Placentia to the capital city of St. John's, where about 100 mm (4 inches) of rain held up the annual Royal St. John's Regatta. Up to 150 mm (6 inches) of rain fell in the Whitbourne area, according to Environment Canada. The most serious flooding was across the southern Avalon Peninsula, where dozens of roads were washed out, houses were flooded above their basements and several communities were isolated. Ferry service between Argentia and North Sydney, Nova Scotia, was stopped, and one ferry was forced to change its course to Port aux Basques.
States of emergency were declared in at least five communities in the areas surrounding Placentia Bay and Conception Bay, and the Newfoundland and Labrador Municipal Affairs Minister Jack Byrne has requested a federal disaster area declaration. Damage is estimated to be well into the millions of dollars, with at least $4 million in damage in the town of Placentia alone.
A strong tropical wave moved off the west coast of Africa in the second week of August. It quickly gathered itself and turned into into a low on August 12. Tropical Depression Four was made on August 13 in the east part of the Atlantic from the tropical wave to the south of Cape Verde. The depression was already having continuing deep thunderstorms, but mostly at the west part of its spinning because of wind shear from the east. The depression was supposed to become stronger a lot over the next few days due to wind shear becoming more weak and warmer sea surface temperatures which made conditions better for it to become stronger. The depression moved west very fast, south of a deep layered high, quickly running away from the shear from the east. Looking at satellite pictures and microwave and QuikSCAT information, the depression was changed to Tropical Storm Dean on August 14. It was changed to a category one then a category two hurricane on August 16, 2007. It got to category three then category four on August 17, 2007. It got to category five on August 20, 2007. Dean made landfall in the Yucatan Peninsula as a category 5. The hurricane made another landfall in Mexico on August 22 and Dean died the next day.
On August 9, an area of convection developed just south of Jamaica in association with a trough of low pressure. The system moved west-northwestward, and by August 10 it had a broad surface trough with minimal shower activity. Convection increased on August 11, and by August 12 a tropical wave and an upper-level low began to merge which resulted in a large area of disorganized thunderstorms extending from the western Caribbean Sea into the central Bahamas. Upper-level winds slowly became more beneficial for development, and on August 13 a large low pressure area formed about 90 miles (145 km) north-northeast of Cancún, Quintana Roo. Late on August 14, a reconnaissance flight into the system reported a small circulation center, but at the time was not well-defined enough to result in the initiation of tropical cyclone advisories. However, deep convection was found near the increasingly organizing center, and at 0300 UTC on August 15 the National Hurricane Center upgraded it as Tropical Depression Five about 425 miles (685 km) southeast of Brownsville, Texas.
Looking at reconnaissance info gotten from an NOAA plane investigating the depression, it was upgraded to Tropical Storm Erin on August 15.
It weakened to a tropical depression as it made landfall near Lamar, Texas, on August 16 and the NHC gave out its last advisory on the system soon after as it moved inland; but the HPC then began taking the responsibility of making advisories as long as the system was still tropical and a flood threat.
Two people were killed when a warehouse broke down in Texas. In all, 17 people died because of Erin.
On August 31, an area of weather east of the Windward Islands became strong enough, and was named Tropical Depression Six. Early on September 1, it was changed to a tropical storm and named Felix. Later that day, Felix was changed to a hurricane. On September 2, Felix was changed to a major hurricane. Felix hit land as a category 5 in northeastern Nicaragua, making it the second hurricane in 2007 to do this. At least 133 people were killed.
An extratropical storm off the coast of the eastern United States was classified as "Subtropical Storm Gabrielle" by the National Hurricane Center late on September 7. It was later reclassified as a tropical storm on September 8. After passing over the Outer Banks of North Carolina, it weakened to a depression on September 10, and the final advisory was issued the next day as it no longer had a well-defined surface circulation.
Gabrielle poured 4-6 inches of rain in the immediate area of landfall, but reports showed minimal damage and no fatalities were reported.
Tropical Depression Eight formed from a tropical wave 1130 mi (1815 km) east of the Lesser Antilles on September 12, just before the system that eventually became Humberto formed. It was slow to develop and became Tropical Storm Ingrid early on September 14. Shearing winds from a tropical upper tropospheric trough soon weakened the cyclone, it returned to depression strength on September 15, and the final advisory was issued on September 17 as the system degenerated into an open wave north of the Leeward Islands. Ingrid was the first storm of the 2007 season not to threaten land, and there were no reports of damage or casualties.
Tropical Depression Nine formed from a non-tropical low in the north-western Gulf of Mexico on September 12. Three hours later it had strengthened sufficiently to be named Tropical Storm Humberto. It rapidly became a hurricane until dissipating over North Carolina. Damage is at a half a billion dollars.
An extratropical low formed off the east coast of Florida on September 18. It slowly tracked westward, breaking itself away from a trough over the Atlantic while crossing the Florida Peninsula on September 19, emerging in the Gulf of Mexico on September 20. It slowly organized itself and was classified as a subtropical depression on the morning of September 21 just south of the Florida Panhandle. Three hours later, it was reclassified as fully tropical. At 8 pm EDT (0000 UTC) later that day, Tropical Depression Ten began to move onshore, and never reached tropical storm strength.
Damage from the precursor low was reported in Eustis, Florida from one or more tornadoes that damaged or destroyed about 50 houses, but caused no serious injuries.