During the month of July, the Azores to Bermuda High dominates the North Atlantic weather extending from the North Sea to the Gulf of Mexico with a mean center near 35N/35W. Storm tracks have shifted north of 50 North latitude, except for one primary track from off the Carolina Coast northeastward towards the Denmark Strait.
Fog occurrence during July is 10% or higher north of a line from Long Island to Ireland. July is also the foggiest month of the year over the Grand Banks with a 40% to over 50% risk for visibility of 2 miles or less. Icebergs can still be found southeast and east of Newfoundland during July
Wind and Waves
South of the Azores-Bermuda high to about 10 N latitude, winds tend to be from the northeast to east averaging Beaufort force 4 (11-16 knots) with waves mostly about 1-1.5 meters (3-5 feet), except winds tend to be more northerly off the coasts of Iberia and northwestern Africa. Northeast to east winds average Beaufort Force 5 (17-21 knots) with waves around 2 meters (6-7 feet) prevailing over the central Caribbean Sea. South of 10 N, winds are more likely to be from the south at Beaufort Force 3 (7-10 knots) with waves 0.5 meters (2 feet) or less.
North of the Azores-Bermuda high winds tend to be mostly from the southwest to west averaging Beaufort Force 4 (11-16 knots) with waves mostly about 1-1.5 meters (3-5 feet).
The risk of encountering gale force (Beaufort Force 8/34 knots) or higher winds is near zero south of about 35 N latitude this month. Between 35 N and 50 N latitudes, the risk for gales is low at 1% or less and north of 50 N latitude the risk is only 1-4 %.
The air temperatures range from 4 C (39 F) in the Davis Strait to about 28 C (82 F) over the Southwest North Atlantic, Gulf of Mexico and Caribbean Sea. Sea surface temperatures range from under 5 C (41 F) in the Davis Strait to about 28-29 C (82-84 F) in Gulf Mexico, Caribbean and the southwestern North Atlantic.
There is an increasing risk for tropical cyclone development during July with the highest risk (14%) occurring in the north-central Gulf of Mexico.