North America PassageWeather now offers specialised Weather Routing for sailing yachts. Typical position of the Florida current. On the other hand, I have had a rare day in March when it was cloudy, rainy and windless for much of the day. Meteorologically, they are one and the same thing. Oran
Cameroon Gibraltar It is these troughs that may spawn hurricanes further to the west. Anyone crossing the Atlantic direct to the UK or via the Azores would have had a rough passage.
Berlin Boston Further N, frontal rain is common. At or very near the equator, a low pressure will quickly fill up and a high collapse. The available cities are represented by red dots on the map. Any hurricane near the coast or over land can spawn tornadoes. In general, pressure within the tropics changes only slowly from day to day, but a diurnal cycle, a [[Atmospheric-Tides | Atmospheric Tide] will be very obvious with pressure maxima at around 1000 and 2200, minima at about 0400 and 1600 - all LT. Halifax However, in low latitudes the pressure gradient to wind relationship progressively breaks down as the air moves increasingly across the isobars. Note that wind statistics from Island stations are not representative of the open sea, eg Funchal, Madeira shows a predominant daytime S because of sea breezes and sheltering from the N. Around the Canaries there are some very marked local effects that can give winds much stronger than over the open sea. If winds diverge near the tropopause, then this increases the upwards movement of air in the easterly wave thus increasing the inflow of air at sea level and encouraging the formation of a circulation of winds because of the Coriolis effect. Over the Caribbean, as a whole, from about Cuba southward, winds are generally around F 4-5 and hold up at night with few calms. Niamey Lisbon Later in the season, formation tends to be confined more to the Caribbean/Gulf of Mexico area. Bergen The diagram shows the very strong gradient of sea temperature of the coast of the US. Such showers drift downwind of their source. For a given pressure gradient, the lower the latitude the stronger will be the wind for the same gradient. Either way, it can be quite disturbed between the US Coast right across the Atlantic. Gran Canaria Nunavut, Baffin Island, Ellesmere Maiduguri Montreal An important feature is the Florida Current which becomes the Gulf Stream as it leaves the coast N of Washington DC. New England Best advice is to be as far south as possible - perhaps Grenada in one of the deep bays on the south coast or in the Trinidad/Venezuela area.
Virginia Ontario, South Copenhagen The diagram shows schematic cross section and surface winds on the global scale. Tropical storms have been known to get as far north as Nova Scotia. Such storms in the China Sea are known as Typhoons, in the Indian Ocean they are Tropical Cyclones. Bamako Guinea-Bissau From the Savannah River northwards is a breeding ground for frontal depressions, particularly in the Winter months. Jacksonville These showers can be heavy with gusts or squalls. During the northern Summer the ITCZ moves north to about 14 deg N off the African coast and about 5 deg N over the Gulf of Mexico/Caribbean area. Algeria, North Ohio Accra The wind will back ahead of them to NE and veer to SE behind. Ciudad Guayana There are not the air mass differences and frontal systems that we see in mid latitudes. This means that Atlantic tropical depressions only form at about 10 deg or more north of the equator. Yaoundé, North Atlantic Slovenia Pointe-à-Pitre Global-Atlantic Weather Map. New York This first section is a brief description of tropical weather where convection is the dominant factor.
This is due to the weakening of the Coriolis effect. Madeira In the south, rainfall is likely to be convective or associated with Tropical storms. [For the mathematically inclined, the Coriolis effect is proportional to the sine of the latitude.] Before and during deliveries, ocean races, regattas, cruises, and all other types of offshore passages, we have Constantine
Further north than Cuba, especially in Winter, extra-tropical lows with their frontal troughs can give strong to gale force winds with cloud and rain rather than showers.
It may be too facile to say that this was an effect of global warning, but it does imply that sea temperatures must have been higher over the South Atlantic than at any time in the past 1000 years or so for which there are accounts of ships crossing the oceans.
Scotland We offer custom Weather Routingand HistoricalWeather Services.
Pilot books advise against being in the Bahamas during the hurricane season. Jan Mayen Togo Lesser Antilles When the wind is blowing across the N wall of the Florida current from the W or NW, there is an increase in turbulence and wind speed. Bermuda South of 25 N gales are unusual. Luxembourg
Kano
Between the islands, the currents are also accelerated and deflected. Germany Nouakchott Those tracks usually take them to the west of the Azores, near or over the Caribbean Islands. Cayenne The closer the isobars, the stronger will be the wind. Our sailing weather forecasts are derived using data from the most trusted and reliable weather models available. The N wall of the Florida current is frequently cloudy with low stratus. Benin Italy Nigeria South Pacific
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