• TROPDISC: Gale and Swells

    From Dumas Walker@21:1/175 to All on Tue Feb 18 08:21:00 2025
    884
    AXNT20 KNHC 181057
    TWDAT

    Tropical Weather Discussion
    NWS National Hurricane Center Miami FL
    1215 UTC Tue Feb 18 2025

    Tropical Weather Discussion for North America, Central America
    Gulf of Mexico, Caribbean Sea, northern sections of South
    America, and Atlantic Ocean to the African coast from the
    Equator to 31N. The following information is based on satellite
    imagery, weather observations, radar and meteorological analysis.

    Based on 0600 UTC surface analysis and satellite imagery through 1050 UTC.

    ...SPECIAL FEATURES...

    Gulf of Mexico Gale Warning: A strong cold front is forecast to
    move into the NW Gulf tonight. The front will sweep across the
    basin through Thu night. A trough will likely develop from its
    remnants over the southwestern Gulf on Fri and linger through Sat
    night while weakening. Near gale north winds with frequent gusts
    to gale force will follow the front over the NW Gulf Wed while
    gale force north winds will develop west of the front off
    Tampico, Mexico Wed and Wed night and off Veracruz, Mexico Wed
    night through Thu night. These winds will produce rough to very
    rough seas, peaking around 14 ft Wed night off Tampico. Winds and
    seas will diminish during the weekend.

    Atlantic Ocean Significant Swell Event: Large, long-period NW
    swell behind a cold front is sustaining seas of 12 to 18 ft
    across the central and eastern subtropical Atlantic, north of 16N
    between 13W and 42W. This swell will subside very gradually while
    shifting eastward toward the Canary and Cabo Verde Islands
    today. Reinforcing NW swell of 12 to 18 ft will follow by Wed
    over the waters north of 27N between 35W and 55W, then subside to
    12 to 15 ft as it moves east of 35W Fri.

    ...MONSOON TROUGH/ITCZ...

    The monsoon trough enters the Atlantic through the coast of
    Guinea near 09N13W and continues southwestward to 02N20W to
    00N34W. The ITCZ extends from 00N34W to 03S42W. Scattered
    moderate convection is noted from 05S to 03N between 13W and 42W.

    ...GULF OF MEXICO...

    Please read the Special Features about the Gale Warning over the
    western Gulf.

    A stationary front extends from the Straits of Florida and then
    weakens to the Bay of Campeche. A broad ridge extends from off
    the Carolinas towards the coast of Texas and across the southern
    Gulf. This pattern is supporting moderate E to SE winds over the
    western and southeast Gulf, and gentle NE winds in the northeast
    Gulf. Seas are slight to moderate basin-wide, highest over the SW waters.

    For the forecast, the stationary front will dissipate today.
    Fresh to strong SE winds will develop over the north-central Gulf
    later today ahead of the next cold front forecast to move into
    the NW Gulf tonight and sweep across the basin through Thu night.
    A trough will likely develop from the front remnants over the
    southwestern Gulf on Fri and linger through Sat night while
    weakening. Near gale north winds with frequent gusts to gale force
    will follow the front over the NW Gulf Wed while gale-force north
    winds will develop west of the front off Tampico, Mexico Wed and
    Wed night and off Veracruz, Mexico Wed night through Thu night.
    Elsewhere, fresh to strong winds are expected through the period,
    becoming more confined to the waters north of 22N and west of 90W
    Fri through Sat night.

    ...CARIBBEAN SEA...

    A broad subtropical ridge over the central Atlantic extends
    southwestward into the Caribbean Sea, supporting fresh to strong
    easterly trade winds across the south-central Caribbean, with
    near-gale force winds off Colombia. Seas in these waters are 6-10
    ft. Moderate to fresh easterly breezes and moderate seas are
    occurring in the north-central and eastern Caribbean. Moderate or
    weaker winds and slight to moderate seas are present elsewhere.

    For the forecast, mostly fresh trade winds and moderate seas are
    expected across the central, eastern and portions of the
    southwestern part of the basin through Sat night, except for
    strong to near gale-force winds and rough seas offshore of
    Colombia and in the Gulf of Venezuela. Gentle to moderate winds
    along with slight to moderate seas will prevail in the
    northwestern Caribbean through Thu night. A cold front will sink
    into the Yucatan Channel and vicinity waters Thu night into Fri,
    reach the Windward Pasage Fri night into Sat before dissipating
    Sat night. Strong high pressure building in the wake of the front
    N of the area will lead to the development of fresh to strong NE
    winds in the Lee of Cuba and the Windward Passage Fri evening
    through Sat night. Otherwise, rough seas in east swell will
    continue east of the Lesser Antilles through Fri night, subsiding afterward.

    ...ATLANTIC OCEAN...

    Please refer to the Special Features section for information on
    the Significant Swell.

    A cold front extends from 31N58W to Andros Island where it stalls
    to the Straits of Florida. Moderate to fresh SW winds are ahead of
    the front N of 27N while rough seas to 9 ft are ongoing between
    55W and 71W. The subtropical ridge is displaced southeastward
    ahead of the front, anchored by a 1022 mb high pressure centered
    near 26N47W, and extending westward to 61W. Otherwise, in addition
    to the large NW swell over the central and eastern subtropical
    waters described in the Special Features section, combined seas
    of 4 to 8 ft are noted between 55W and 72W south of 22N primarily in NW swell.

    For the forecast west of 55W, the cold front will become fully
    stationary and weaken from 29N55W to 27N64W early Wed. Fresh SW
    winds ahead of the front north of 29N will diminish this morning
    as the front continues to move eastward. Fresh to strong southeast
    winds will develop over the central and northeast Florida
    offshore waters Wed ahead of the next cold front forecast to come
    off the coast Wed afternoon. This front will reach from near
    31N77W to Vero Beach, Florida Wed night, from near 31N63W to the
    southern Bahamas and eastern Cuba Thu night, from near 29N55W to
    the Windward Passage Fri night and begin to weaken as it reaches
    from near 26N55W to 22N64W to the Windward Passage Sat night.
    Fresh to strong winds are expected ahead and behind this second
    front north of about 27N through Fri. Strong high pressure will
    build Sat and Sat night in the wake of the front. The resultant
    tight gradient will bring fresh to strong NE winds to the Straits
    of Florida and the Great Bahama Bank primarily south of 25N Fri
    night into Sat night.

    $$
    Ramos
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  • From Dumas Walker@21:1/175 to All on Thu Feb 20 08:25:00 2025
    817
    AXNT20 KNHC 201049
    TWDAT

    Tropical Weather Discussion
    NWS National Hurricane Center Miami FL
    1215 UTC Thu Feb 20 2025

    Tropical Weather Discussion for North America, Central America
    Gulf of Mexico, Caribbean Sea, northern sections of South
    America, and Atlantic Ocean to the African coast from the
    Equator to 31N. The following information is based on satellite
    imagery, weather observations, radar and meteorological analysis.

    Based on 0600 UTC surface analysis and satellite imagery through 1030 UTC.

    ...SPECIAL FEATURES...

    Gulf of Mexico Gale Warning:
    A strong cold front extends from Venice, Florida southwestward to
    23N90W to the central Bay of Campeche. The front will continue to
    quickly move southeastward across the remainder of the basin
    through tonight. A Gale Warning remains in effect today through
    this evening for off Veracruz. These winds will continue to
    produce rough to very rough seas, peaking to around 19 ft today
    off Veracruz. Winds and seas will diminish during the weekend.

    Atlantic Ocean Significant Swell Event:
    Large NW swell of 12 to 16 ft over the subtropical Atlantic north
    of 27N between 35W and 55W will shift eastward, and cover the
    waters north of 25N between 25W and 50W today, and north of 17N
    east of 35W Fri before gradually subsiding.

    ...MONSOON TROUGH/ITCZ...

    A monsoon trough extends from 11N15W to 02N20W. The ITCZ extends
    from 02N20W to 00N30W to 02S40W. Scattered moderate isolated
    strong convection is ongoing from 01S to 06N between 03W to 20W.
    Scattered moderate convection is elsewhere from 04S to 03N between
    20W and 32W.

    ...GULF OF MEXICO...

    Please read the Special Features section about the Gale Warning in
    the Gulf of Mexico.

    A strong cold front extends from Venice, Florida southwestward
    to 23N90W to the central Bay of Campeche. A Gale Warning remains
    in effect today through this evening for off Veracruz with rough
    to very rough seas, already peaking to around 19 ft off Veracruz.
    Scattered showers and thunderstorms are active ahead of the cold
    front over the SE Gulf, the Yucatan Peninsula and the Bay of
    Campeche. Strong to near-gale force winds follow the front
    elsewhere across the Gulf. Seas range from 8 to 18 ft behind the
    front west of 86W, with the highest wave heights off Veracruz,
    Mexico. Seas ahead of the front over the SE Gulf are 3 to 7 ft
    where winds are light to gentle.

    For the forecast, the cold front will continue to quickly move
    southeastward across the remainder of the basin through tonight.
    Gale force northerly winds will continue off Veracruz through
    this evening. Winds and seas will gradually diminish over the
    weekend. A trough is expected to develop from the frontal remnants
    over the west-central and SW Gulf on Fri and linger through Sat
    night while weakening. Fresh to strong winds are expected over the
    waters north of 22N and west of 90W Fri through Sat night. Low
    pressure may develop along the trough on Sat near southern Texas
    and track NE near the rest of the Texas coast through Sun night
    while weakening. High pressure will settle in over the NW Gulf
    early next week, preceded by a surge of moderate to fresh
    northerly winds from the eastern Gulf to the SW Gulf.

    ...CARIBBEAN SEA...

    The broad subtropical ridge that has persisted north of the region
    for the last several days is weakening and shifting eastward ahead
    of a strong cold front moving through the Gulf of Mexico. This
    is allowing trade winds across the eastern and central Caribbean
    to diminish a bit, although strong NE to E winds and rough seas
    persist near the coast of northeast Colombia and in the Gulf of
    Venezuela. Moderate to fresh E winds and 5 to 7 ft seas persist
    elsewhere across the Caribbean, except for 2 to 4 ft over the
    northwest Caribbean outside of the Gulf of Honduras where fresh E
    winds are pulsing.

    For the forecast, moderate to fresh trade winds and moderate seas
    will continue over most sections of the central and eastern
    Caribbean through Mon night, except for strong to near gale-force
    winds and rough seas offshore of Colombia and within and near the
    Gulf of Venezuela. Gentle to moderate winds along with slight to
    moderate seas will prevail in the northwestern Caribbean through
    tonight, then return Sat night through Mon night. A cold front
    will approach the Yucatan Channel tonight, reach the Windward
    Passage late Fri, stall along western Hispaniola Fri night, then
    gradually lift northward Sat before dissipating Sat night near the
    southern Bahamas. Strong high pressure will build in the wake of
    the front N of the area and will lead to the development of fresh
    to strong NE winds in the Lee of Cuba and the Windward Passage Fri
    evening through early Sun. Otherwise, rough seas in east swell
    will continue east of the Lesser Antilles through Sat, subsiding afterward.

    ...ATLANTIC OCEAN...

    Please refer to the Special Features section for information on
    the Significant Swell.

    A cold front extends from 31N76W SW to Melbourne, Florida. Fresh
    to strong S winds and rough seas are evident ahead of the front to
    63W, north of 27N. Fresh to locally strong W to NW winds also
    follow the front with rough seas to 9 ft. S of 27N and ahead of
    the front, winds are from the SE to S and seas are moderate to
    rough in E swell. A broad ridge anchored by a 1025 mb high W of
    the Canary Islands and a 1023 mb high E of Bermuda covers the
    remainder subtropical Atlantic waters. Winds over the central and
    eastern subtropical waters are gentle to moderate, except between
    the Canary and Cape Verde Islands where NE winds are fresh to
    strong with seas to 12 ft. Over the tropical Atlantic, trades are
    mainly fresh and seas are rough to 10 ft pprimarily in NW swell.

    For the forecast west of 55W, fresh to strong winds will continue
    to affect the offshore waters N of 27N through Fri, ahead and
    behind the cold front. The front will reach from Bermuda to
    central Cuba early Fri, from near 31N57W to the Windward Passage
    Fri evening, from 28N55W to western Hispaniola Fri night into Sat
    where it will stall and then gradually lift northward Sat before
    dissipating Sat night near the southern Bahamas. Strong high
    pressure will build Sat and Sat night in the wake of the front.
    The resultant tight gradient will bring fresh to strong northeast
    winds south of 25N, including the Florida Straits and the Great
    Bahama Bank, Fri night into Sat night. Conditions begin to improve
    beginning Sun morning as a second but weaker cold front moves
    across the NW offshore waters, reaching from near 31N71W to
    29N74W Mon night.

    $$
    Ramos
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