Tropical Weather Discussion
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AXNT20 KNHC 242310

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
710 PM EDT Sat Jun 24 2017

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 32N. The following information is based on satellite
imagery, weather observations, radar and meteorological analysis.

Based on 1800 UTC surface analysis and satellite imagery through
2300 UTC.


An eastern Atlantic tropical wave has an axis that extends from
18N34W to 05N38W, moving westward at 15 to 20 kt. This wave is
embedded in a large 700 mb trough, with Saharan dust across the
wave environment north of 10N. Isolated moderate convection is
within 120 nm of either side of the wave axis south of 10N.

A central Atlantic tropical wave has an axis that extends from
17N54W to 06N57W, moving westward at 15 to 20 kt. This wave
embedded in broad 700mb troughing, with some turning evident in
satellite imagery. Scattered moderate convection is from 09N to
14N between 55W and 59W.

A tropical wave is over the east-central Caribbean with an axis
extending from 18N70W to 08N71W, moving westward at 15 kt. This
wave is indicated by 700 mb troughing in model field data. Dry air
an subsidence over the northern portion of the wave is inhibiting
convection over the Caribbean, with convection mainly confined to
northern Venezuela.


The Monsoon Trough extends from the Africa coast near 07N12W to
07N20W. The Intertropical Convergence Zone axis begins near
07N20W and continues to 08N32W to 05N37W, then resumes W of a
tropical wave near 04N39W and continues to 05N52W. Aside from the
convection associated with the tropical waves, scattered moderate
and isolated strong convection is within 180 nm either side of
the convergence axis.



High pressure over the western Atlantic has a ridge axis that
extends across the northern Gulf to about 90W along about 28N,
supporting moderate southeast winds across the southern half of
the Gulf. The only exception is light winds in the vicinity of
the ridge axis over the northeastern Gulf. A vigorous upper low
over the SW Gulf and a surface trough along the Yucatan Peninsula
supports scattered thunderstorms mainly south of 24N, between 87W
and 92W. During the next 24 hours a weak frontal boundary over
the southern United States will drift into the northern Gulf
coast, increasing chances for showers and thunderstorms over the
northern Gulf. The upper low will move west toward central Mexico.


The Caribbean is nearly devoid of deep convection this evening,
as mid to upper level dry air has spread across much of the basin.
Mainly moderate to fresh trades prevail in the Caribbean, except
light winds over the southwest Caribbean south of 11N. A tropical
wave is along 70W. Please refer to the tropical waves section for
more details. By Sunday afternoon, a stronger Atlantic tropical
wave will reach the Lesser Antilles, with increased showers and


widely scattered showers will affect the southern portion of the
island through Sunday as a tropical wave passes to the south.


A pair of tropical waves are crossing the tropical north Atlantic
waters. Please refer to the tropical waves section for more
details. A weak surface trough lacking convection extends from
28N59W to 24N63W. Another weak surface trough, which is the
reflection of an upper low aloft, extends from 30N48W to 26N51W.
This trough also lacks deep convection. High pressure centered
north of the discussion area in the east-central Atlantic has a
ridge axis that extends west-southwestward to northern Florida,
and dominates the remainder of the tropical Atlantic waters.

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