[Tropical] Tropical Weather Discussion

[EMWIN Server]

AXNT20 KNHC 240603
TWDAT

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
0605 UTC Sat Jul 24 2021

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 0000 UTC surface analysis and satellite imagery through
0550 UTC.

...SPECIAL FEATURES...

A 1015 mb low pressure centered well east of Jacksonville,
Florida, near 30N78W has a trough that extends S-SW to near
Stuart, Florida. This low continues to produce showers and
thunderstorms. This system has become better organized since
yesterday, and a tropical depression could Form over the weekend
while the low meanders offshore or near the Florida peninsula.
Interest in Florida should monitor the progress of this system.
There is a medium chance for development in the next 5 days.
Please read the latest Tropical Weather Outlook at hurricanes.gov,
for more information.

Heavy Rainfall in Southern Central America: High moisture content,
persistent strong trade wind flow, and favorable conditions aloft
will continue to support heavy rainfall for much of southern
Central America through early next week. The heaviest rain is
expected over the Caribbean coast of Costa Rica and southeast
Nicaragua. These rains could cause significant flooding and
mudslides in some areas. Currently, scattered moderate to strong
convection is noted along the Caribbean coast from southern
Nicaragua through western Panama.

...TROPICAL WAVES...

An Atlantic tropical wave is analyzed along 58W, from south of
19N, moving W 10 to 15 kt, approaching the Lesser Antilles. A
few showers and thunderstorms are noted in the vicinity of the
wave axis. Patches of Saharan dust are following the tropical wave
over the tropical Atlantic.

A Caribbean tropical wave is analyzed along 71W, from Haiti to
northwest Venezuela, moving W at 15 to 20 kt. No significant
convection is associated with this wave.

Another Caribbean tropical wave is analyzed along 82W, north of
14N through western Cuba. No significant convection is
associated with this wave.

...MONSOON TROUGH/ITCZ...

The monsoon trough enters the Atlantic Ocean near Guinea-Bissau
near 11N16W to 06N30W. The ITCZ continues from 06N30W to 07N51W.
Scattered moderate convection is noted over the eastern Atlantic
from 06N to 11N between 13W and 25W, and over the western
Atlantic from 06N to 12N between 43W and 53W.

GULF OF MEXICO...

A line of showers and strong thunderstorms have moved offshore
the Florida Panhandle extending from the Big Bend to south of
Pensacola, Florida. Some of the stronger storms could produce gust
up to 34 kts with frequent lightning. These strong thunderstorms
will remain over open waters tonight. Across the northwest Gulf, a
1019 mb high pressure is centered near 27N92W, which is
dominating the weather pattern across much of the Gulf. To the
southeast, a surface trough is analyzed from 22N87W southwest into
the Yucatan Peninsula. Scattered moderate to strong convection is
noted in the west coast of the Yucatan Peninsula near the trough.
Moderate to locally fresh S winds are noted along the Texas
coast, west of the high pressure. Elsewhere, the dominant 1019 mb
high pressure is supporting light to gentle breezes and mostly 1
to 3 ft across the basin.

For the forecast, the high pressure in the northwest Gulf of
Mexico will drift westward over the weekend as low pressure
meanders offshore of the Atlantic waters of Florida. This is
expected to produce tranquil marine conditions across the Gulf
through early next week.

CARIBBEAN SEA...

Upper low centered north of Hispaniola near 21N83W interacting
with the tropical wave to the east moving into the NE Caribbean
is supporting squalls and strong thunderstorms to develop north
of the U.S. Virgin Island and into the northern waters of Puerto
Rico. Expect this activity to increment tonight into Saturday.
Latest scatterometer indicates a large area of fresh to strong
trades winds over the south-central and southwest Caribbean, with
the strongest winds off northeast Colombia. Seas are 5 to 8 ft in
this area. These enhanced winds are between high pressure centered
across the central Atlantic extends W-SW to central Florida and
low pressure over northern Colombia. Fresh winds are also noted
just west of the Leeward Islands, south of Cabo Beata on the south
coast of Hispaniola, and over the northern part of the Windward
Passage. Elsewhere, generally moderate E winds and 3 to 5 ft seas
are noted.

For the forecast, high pressure centered across the central
Atlantic extends W-SW to the NW Bahamas tonight. This ridge will
weaken through early next week as the high shifts slowly NE and
low pressure persists offshore of the NE Florida coast. This will
lead to a gradual diminishing in the strength of tradewinds across
the basin. Look for scattered squalls and tstms across the NE
Caribbean tonight and Sat associated with a fast-moving tropical
wave.

ATLANTIC OCEAN...

Please see the Special Features section above for information
related to the area of low pressure off northeast Florida.

Upper low centered north of Hispaniola near 21N83W interacting
with the tropical wave to the east moving into the NE Caribbean
is supporting squalls and strong thunderstorms to develop north
of the U.S. Virgin Island and in the northern waters of Puerto
Rico. Moderate to strong Convection is starting to increase north
of Puerto Rico to 22N between 61W to 66W. Expect this activity to
increment today as tropical wave moves across the eastern
Caribbean.

Elsewhere, an expansive 1028 mb high pressure near 34N41W is
supporting mainly dry weather conditions across the remainder of
the basin. Fresh to locally strong E winds are probably active off
the north coast of Hispaniola, reaching westward to the approaches
of the Windward Passage, with 5 to 6 ft seas. Farther east, an
area of fresh trade winds is found south of 25N and west of 43W
due to the pressure gradient between the strong ridge and lower
pressures over South America. Seas within this region are 6-8 ft.
Another area of fresh to strong NE winds surrounds the Canary
Islands east of 25W, with winds reaching near gale force between
the islands. Seas are 5-7 ft east of 25W. Elsewhere, gentle to
moderate flow prevails and seas of 4-6 ft.

For the forecast, moderate to fresh trades will prevail south of
25N through Sun. Low pressure near 30N78.5W 1015 mb has a trough
that extends S-SW to SE Florida. Environmental conditions are
forecast to be marginally conducive for additional development of
this low, with potential for it to become a tropical depression
over the weekend while it meanders just offshore of Florida.
Scattered squalls and tstms associated with a fast moving tropical
wave will move across the SE waters and north of the Greater
Antilles tonight through Sat.

MTorres

$$
Torres
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