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Special Features

Western and Central Atlantic Gale Warnings/Significant Swell: A cold front extends from 31N46W to the north coast of Hispaniola. Gale-force W winds are ongoing behind the front, N of 28N, westward to 68W. Seas in these gales are 20 to 28 ft, with very rough seas in excess of 12 ft extending southward to 21N between 40W and 74W due to a broad area of very significant NW swell. Generally fresh to strong NW to W winds are present where the very rough seas are ongoing behind the front, with SW winds of similar magnitude ahead of the front. The cold front will move slowly east through through Tue, while weakening, then stall from around 31N38W to 18N56W. Gale-force winds should end early Tue morning, but the very rough seas will persist, gradually decaying from W to E, but remaining above 12 ft for portions of the waters through Wed. Mariners are urged to stay up to date with the latest forecasts.

South-Central Caribbean Gale Warning: High pressure building southward toward the Greater Antilles early this week will tighten the pressure gradient over the Caribbean, increasing tradewinds. The result will be gale-force winds pulsing tonight and again Tue night offshore Colombia, mainly within about 90 nm from the coast. Seas will build to 9 to 11 ft in association with these gales.

Please read the latest High Seas and Offshore Waters Forecasts issued by the National Hurricane Center at website: https://www.nhc.noaa.gov/text/MIAHSFAT2.shtml and https://www.nhc.noaa.gov/marine/offshores.php for more details on these events.

Monsoon Trough/ITCZ

The monsoon trough axis enters the Atlantic through the coast of Liberia near 06N10W and extends southwestward to near 02N18W, where it transitions to the ITCZ that continues to 00N44W. Scattered moderate isolated strong convection extends from 00N to 04N between 09W and 34W. Scattered moderate convection extends from 00S to 04N between 34W and 44W.

Gulf Of America

High pressure of 1025 mb is centered over the east-central Gulf near 26N88W, with the associated ridge extending across the basin. Thus, winds are light to gentle and anticyclonic, with some locally moderate E winds the E Bay of Campeche. Seas are 1 to 3 ft, except for the eastern Bay of Campeche, where 4 ft seas are ongoing.

For the forecast, high pressure will dominate the Gulf waters through late week, bringing gentle to moderate mainly southerly flow. Locally fresh winds are expected, mainly at night, just west of the Yucatan Peninsula, and over the far western waters. Slight to moderate seas will prevail. In the wake of a cold front that will slide E of the Leeward Islands today and tonight, high pressure will build southward into the basin, leading to increasing trade winds. Fresh NE winds will dominate much of the basin through mid-week, with strong winds developing over the central Caribbean. Winds are likely to pulse to gale-force tonight and again Tue night offshore Colombia. Meanwhile, large NW to N swell will impact the Mona Passage, Anegada Passage, and tropical N Atlantic waters into Wed. , CARIBBEAN SEA,

See Special Features section above for information on a Gale Warning in effect for waters offshore Colombia.

A surface trough extends from the Leeward Islands to the SW basin near 14N75W. Another weak surface trough is along 81W, southward from 17N. Otherwise, high pressure centered N of the area dominates, creating a trade-wind regime for area waters. Fresh NE winds are present over the basin between 65W and 83W, with mainly moderate winds farther to the east and west. Strong winds have developed offshore Colombia and Dominican Republic. Seas where the fresh to strong winds exist are 5 to 7 ft, with 3 to 5 ft seas elsewhere. Some locally rough seas are likely present just offshore Colombia.

For the forecast, in the wake of a cold front that will slide E of the Leeward Islands today and tonight, high pressure will build southward into the basin, leading to increasing trade winds. Fresh NE winds will dominate much of the basin through mid-week, with strong winds developing over the central Caribbean. Winds are likely to pulse to gale-force tonight and again Tue night offshore Colombia. Meanwhile, large NW to N swell will impact the Mona Passage, Anegada Passage, and tropical N Atlantic waters into Wed.

Atlantic Ocean

Please see the Special Features section for details on a gale warning and significant swell in the western and central Atlantic.

Hazardous marine conditions dominate much of the basin, as depicted in the Special Features section, in association with a cold front crossing the central basin. High pressure of 1025 mb centered over Florida and the Canary Islands dominate most of the remaining waters, providing moderate or weaker winds and moderate seas. Moderate to fresh trades are impacting a belt S of 20N between Africa and the Windward Islands, and seas in this region are 5 to 7 ft.

For the forecast W of 55W, very rough seas impacting waters E of 74W will only slowly subside from W to E, decaying below 12 ft region-wide by Wed. Peak seas this morning along 31N to the SE of Bermuda will be as high as 28 ft. High pressure will cross the waters Tue through Thu, leading to mainly improving conditions, but another frontal system passing N of the region will lead to strong SW winds N of 29N during this time.

Posted 0 minutes ago by NHC Forecaster Konarik