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WX ARC 2017 25 Nov




Synopsis: Gibraltar to E Atlantic: Good morning. A gale near 31N/27W with a cold front SW to 17N/35W will move NE while weakening into a low to near 37N/20W by overnight the 27. The cold front will lift NE and extend from the low center SW to 20N/30W by afternoon the 27. The cold front will lift NE while weakening thru the 28. High pressure near 27N/43W with a ridge S to 15N on the 27 will move E to near 30N/35W on the morning of the 28.


Conclusion:


Zones BB, CC and DD: The main influence of conditions across these zones will continue to be the aforementioned gale. Across the zones, both wind and seas conditions will gradually begin to ease thru today and the remainder of the forecast period as the gale weakens and shifts NE'ward. Winds and seas will be highest across the E portion of zone DD, mainly widespread thru CC, and across the W-NW parts of BB.


Zones GG and MM: These two zones will vary more so due to more of a thermal interaction from W Africa. Closer to the coast (along E portions), winds will tend to be stronger and more NE . Farther offshore, winds will be generally lighter (and vary more SW in zone GG). Long period N-NW swell will build across both zones thru tomorrow, then gradually lower thru the 27.


Zones HH and II: These zones will be far enough south that winds will remain generally light across the zones (though strongest in N most portions thru today). Beyond today, winds will become even lighter/more variable as the low departs and weak ridging builds. Long period swell will be highest today, then gradually lower thru the remainder of the forecast period (highest values farthest north).


Zone NN: This zone is farther away from both the coast and gale to see any significant changes in wind conditions. NE Breezes will remain light thru tomorrow across much of the zone. By the 27, winds will freshen a bit as ridging begins to build in. Swell will gradually increase across the zone thru the first half of tomorrow, then lower thereafter (highest sets will be in more N areas).


T=25NOV 0600 UTC


BB FORECAST:

T+0:SSW-WSW(203 - 248) 22-27 GUSTS 35KTS. SEAS 4-5 SWELLS W-NW/MIXED/SW 9-11FT PRTLY CLDY. SCATTERED SHWRS*CURRENTS FROM W @ 0.9KTS.

T+12: SSW-WSW(203 - 248) 20-25 GUSTS 33KTS. SEAS 4-5 SWELLS W-NW/MIXED/SW 8-10FT MSTLY CLDY. ISLTD SHWRS*CURRENTS FROM WSW @ 1.3KTS.

T+24: SSW-WSW(203 - 248) 18-23 GUSTS 30KTS. SEAS 4-5 SWELLS W-NW/MIXED/SW 7-9FT CLDY. CURRENTS FROM W @ 0.8KTS.

T+36: SSW-WSW(203 - 248) 16-21 GUSTS 26KTS. SEAS 3-4 SWELLS W-NW/MIXED/SW 6-8FT CLEAR. CURRENTS FROM WSW @ 1KTS.

T+48: SW-W(225 - 270) 14-19 GUSTS 24KTS. SEAS 3-4 SWELLS WNW-NNW 5-7FT CLEAR. CURRENTS FROM WNW @ 0.6KTS.


CC FORECAST:

T+0:W-NW(270 - 315) 20-25 GUSTS 33KTS. SEAS 4-5 SWELLS WNW-NNW 12-14FT CLDY. ISLTD SHWRS*CURRENTS FROM WNW @ 0.3KTS.

T+12: W-NW(270 - 315) 18-23 GUSTS 30KTS. SEAS 4-5 SWELLS NW-N 10-12FT MSTLY CLDY. ISLTD SHWRS*CURRENTS FROM NNW @ 0.4KTS.

T+24: WSW-WNW(248 - 293) 15-20 GUSTS 28KTS. SEAS 3-4 SWELLS NW-N 8-10FT MSTLY CLDY. ISLTD SHWRS S / WEAKKTS.

T+36: WSW-WNW(248 - 293) 14-19KTS. SEAS 3-4 SWELLS NNW-NNE 6-8FT PRTLY CLDY. ISLTD SHWRS*NNW @ 0.2KTS.

T+48: WSW-WNW(248 - 293) 12-17KTS. SEAS 2-3 SWELLS N-NE 5-7FT PRTLY CLDY. ISLTD SHWRS*CURRENTS FROM NNE @ 0.1KTS.


DD FORECAST:

T+0:NNW-NNE(338 - 23) 16-21 GUSTS 26KTS. SEAS 3-4 SWELLS NNW-NNE 11-13FT CLDY. ISLTD SHWRS*NE @ 0.4KTS.

T+12: NNW-NNE(338 - 23) 15-20 GUSTS 25KTS. SEAS 3-4 SWELLS NNW-NNE 9-11FT PRTLY CLDY. ISLTD SHWRS*NE @ 0.3KTS.

T+24: NNW-NNE(338 - 23) 12-17KTS. SEAS 2-3 SWELLS N-NE 8-10FT PRTLY CLDY. CURRENTS FROM NE @ 0.3KTS.

T+36: NW-N(315 - 0) 09-14KTS. SEAS 1-2 SWELLS N-NE 7-9FT PRTLY CLDY. ISLTD SHWRS*CURRENTS FROM E @ 0.3KTS.

T+48: NNW-WNW(338 - 293) 08-13KTS. SEAS 1-2 SWELLS N-NE 6-8FT PRTLY CLDY. ISLTD SHWRS*CURRENTS FROM NE @ 0.2KTS.


GG FORECAST:

T+0:SW-W/VARY/N(225 - 270) 12-17KTS. SEAS 2-3 SWELLS WNW-NNW 6-8FT CLDY. CURRENTS FROM NNE @ 0.1KTS.

T+12: SW-S/VARY/N(225 - 180) 11-16KTS. SEAS 2-3 SWELLS WNW-NNW 7-9FT PRTLY CLDY. CURRENTS FROM NNW @ 0.3KTS.

T+24: SW-S/VARY/N(225 - 180) 12-17KTS. SEAS 2-3 SWELLS WNW-NNW 6-8FT PRTLY CLDY. CURRENTS FROM N @ 0.2KTS.

T+36: N-NE(0 - 45) 12-17KTS. SEAS 2-3 SWELLS WNW-NNW 6-8FT MSTLY CLDY. CURRENTS FROM NE @ 0.2KTS.

T+48: NNE-ENE(23 - 68) 13-18KTS. SEAS 2-3 SWELLS NW-N 5-7FT MSTLY CLDY. CURRENTS FROM NNE @ 0.3KTS.


HH FORECAST:

T+0:W-NW(270 - 315) 11-16KTS. SEAS 2-3 SWELLS NW-N 10-12FT PRTLY CLDY. ISLTD SHWRS. CURRENTS FROM NNE @ 0.5KTS.

T+12: WSW-WNW(248 - 293) 09-14KTS. SEAS 1-2 SWELLS NW-N 8-10FT MSTLY CLDY. ISLTD SHWRS*CURRENTS FROM NE @ 0.4KTS.

T+24: W-SW(270 - 225) 08-13KTS. SEAS 1-2 SWELLS NW-N 7-9FT CLDY. ISLTD SHWRS*CURRENTS FROM NE @ 0.1KTS.

T+36: W-SW/VARY/E(270 - 225) 07-12KTS. SEAS 1-2 SWELLS NW-N 6-8FT PRTLY CLDY. ISLTD SHWRS. CURRENTS FROM NNE @ 0.4KTS.

T+48: ENE-ESE(68 - 113) 08-13KTS. SEAS 1-2 SWELLS NW-N 5-7FT CLEAR. CURRENTS FROM NE @ 0.4KTS.


II FORECAST:

T+0:NNW-NNE(338 - 23) 08-13KTS. SEAS 1-2 SWELLS NNW-NNE 9-11FT MSTLY CLDY. ISLTD SHWRS*CURRENTS FROM ESE @ 0.3KTS.

T+12: NNW-NNE(338 - 23) 07-12KTS. SEAS 1-2 SWELLS NNW-NNE 8-10FT PRTLY CLDY. ISLTD SHWRS. CURRENTS FROM ESE @ 0.2KTS.

T+24: N-NE(0 - 45) 06-11KTS. SEAS 1-2 SWELLS NNW-NNE 7-9FT CLEAR. CURRENTS FROM ENE @ 0.2KTS.

T+36: NE-E(45 - 90) 07-12KTS. SEAS 1-2 SWELLS NNW-NNE 6-8FT MSTLY CLDY. CURRENTS FROM SE @ 0.3KTS.

T+48: ENE-ESE(68 - 113) 08-13KTS. SEAS 1-2 SWELLS NNW-NNE 5-7FT CLEAR. CURRENTS FROM ESE @ 0.1KTS.


MM FORECAST:

T+0:N-NE(0 - 45) 11-16KTS. SEAS 2-3 SWELLS N-NW 3-5FT CLDY. CURRENTS FROM SSE @ 0.2KTS.

T+12: N-NE(0 - 45) 13-18KTS. SEAS 2-3 SWELLS N-NW 4-6FT CLDY. CURRENTS FROM SW @ 0.2KTS.

T+24: N-NE(0 - 45) 13-18KTS. SEAS 2-3 SWELLS N-NW 5-7FT  PRTLY CLDY. CURRENTS FROM NNW @ 0.3KTS.

T+36: N-NE(0 - 45) 12-17KTS. SEAS 2-3 SWELLS N-NW 6-8FT CLDY. CURRENTS FROM ENE @ 0.5KTS.

T+48: NNE-ENE(23 - 68) 12-17KTS. SEAS 2-3 SWELLS N-NW 5-7FT MSTLY CLDY. CURRENTS FROM ESE @ 0.4KTS.


NN FORECAST:

T+0:NNE-ENE(23 - 68) 07-12KTS. SEAS 1-2 SWELLS NW-N 4-6FT CLEAR. CURRENTS FROM E @ 0.2KTS.

T+12: NE-E(45 - 90) 08-13KTS. SEAS 1-2 SWELLS NW-N 6-8FT CLEAR. CURRENTS FROM SSE @ 0.3KTS.

T+24: NE-E(45 - 90) 08-13KTS. SEAS 1-2 SWELLS NW-N 6-8FT CLEAR. CURRENTS FROM E @ 0.3KTS.

T+36: NNE-ENE(23 - 68) 09-14KTS. SEAS 1-2 SWELLS NW-N 6-8FT MSTLY CLDY. CURRENTS FROM SE @ 0.4KTS.

T+48: NNE-ENE(23 - 68) 11-16KTS. SEAS 2-3 SWELLS NNW-NNE  5-7FT CLDY. CURRENTS FROM SE @ 0.3KTS.

* WINDS AND SEAS HIGHER IN SQUALLS