Bulletin météo du 4 avril 2015
One Planet, One Ocean & Pharmaton et We Are Water naviguent à la limite d'un régime de NW à N, qui s'établit entre le NE Atlantique et le golfe de Cadix. Ce flux provoque l'apparition d'un thalweg sur le golfe de Cadix et la côte marocaine. Le flot de NNW devrait progressivement se substituer au régime d'E qui souffle sur le détroit de Gibraltar.
Renault Captur a pu constater que les alizés mollissaient à l'approche d'une dorsale. Cette dorsale s'effondre à l'approche d'un front froid qui vient du nord nord-ouest. Le front pourrait provoquer une rupture de l'alizé, mais qui serait profitable puisque le vent autoriserait quasiment une route directe vers Gibraltar. Pour Spirit of Hungary, le passage de l'équateur a été très lent. Les vents devraient virer au NE et petit à petit se renforcer, permettant de progresser un peu plus rapidement vers le nord.
*** SYNOPSIS ***00Z SATURDAY (04-APR-2015)1) Right-shifted NE trade winds will return to the waters north of the Equator, though winds will remain quite light. Very light conditions are expected west of 30W north to 04S. East of 30W, NE trade winds will increase with distance west.2) Moderate (normal) trade winds are expected north of about 08N. Winds east of about 27W will be N/NNE.3) High pressure (1025mb) will be pushed south to 29N/34W by a strong cold front moving east across the north-central Atlantic. A ridge of high pressure will extend northeast of the high to the Azores.4) The cold front will move southeast and eventually dissipate the ridge, with NW winds filling between the Azores and 30N.5) A trough of low pressure will move east off the Moroccan coast, with an area of light and variable winds southwest of Portugal settled on 35N/13W. N winds will be between this light patch and the high pressure ridge, extending south to 30N between 15W and 27W.6) Moderate Eíly out of the Gibraltar Strait and across the northern half of the Gulf of Cadiz.7) Mainly light to moderate E/NE winds south of Spain across the Alboran Sea and into the southwestern Med.8) Along the eastern coast of Spain, continued mainly light winds with coastal overnight drainage winds interspersed with coastal afternoon sea breezes from the S/SE. Afternoon sea breezes could reach moderate strength near the coast in the mid-/late-afternoon.00Z SUNDAY (05-APR-2015)1) NE trade winds will build moderate north of about 04N, and build fresh north of about 12N. Fresh NE trade winds hold through to 27N where they will ease and back toward the N.2) A cold front moving southeast of the Azores arrives near 30N/30W. N/NW winds freshen across Madeira, and start to fill to the Moroccan coast, dissipating the trough with time.3) Thermal low pressure (1007mb) developing over southwestern Iberia. Weak high pressure (1011mb) over the western Med near Palma. Eíly flow persists but is weakening south of Spain. Light Síly gradient flow across the Balearic Sea to Barcelona, with overnight drainage winds giving way to afternoon sea breezes on the Spanish coast.00Z MONDAY (06-APR-2015)1) NE trade winds from Equator to 30N. These are driven by high pressure (1031mb) centered near 35N/39W. Strongest trades will be found from about 15N to 23N.2) A dying cold front embedded within the trade wind flow will have some shower/squalls associated with it, along will a brief wind increase and left shift. The front lies roughly west to east along 26N. 3) Low pressure (1007mb) off Vigo will extend with a trough west to the Cape Verde Islands. 4) North of 30N and east of 30W, mainly NW/N winds, backing NW/W into the Gulf of Cadiz. Generally stronger west of 12W and lighter to the east.5) High pressure (1031mb) moving across UK will support a NE/E flow into the western Med, possibly moderate for fresh. Strongest winds will be south of Spain out of the Southwestern Med and into the Alboran Sea. Winds may veer to a SE sea breeze along the Spanish coast during afternoon sea breezes.**************************************General Forecast along race route*** SATURDAY (04-APR-2015) **** 00N to 05N and 35W to 25W *WIND: Generally N 5-10, especially west of 30W. Lighter with distance east. West of 30W, generally N 5-10, increasing to 10-15 near 05N.SEAS: 1m or lessWEATHER: Partly cloudy.* 05N to 10N and 35W to 25W *WIND: Becoming NNE to NE 10-15, except lighter 7-12 east of 30W. Chance of winds 12-17 north of 08N or 09N.SEAS: 1-2mWEATHER: Partly cloudy.>>>>>* 20N to 25N and 40W to 30W *WIND: E/NE 12-17 SEAS: 1-2mWEATHER: Partly cloudy.* 25N to 30N and 40W to 30W *WIND: NE 12-17 easing 10-15 north of 28N. SEAS: 1-2mWEATHER: Partly cloudy. Chance of showers approaching from the north late in the period.>>>>>* 30N to 35N and 20W to Morrocan coastWIND: NW/W 10-15. Easing to 5-10 east of 17W. Becoming light and variable north of 34N and east of 15W.SEAS: 1-2mWEATHER: Partly cloudy. * Gulf of Cadiz to Gibraltar Strait *WIND: Mainly E 5-15, except near 20 across the approaches to Gibraltar. Easing and becoming light and variable later in the period, except for Eíly hold very close to the strait.SEAS: 1mWEATHER: Partly cloudy.