[Tropical] Tropical Weather Outlook and Summary

[EMWIN Server]

ABNT20 KNHC 120005 CCA
TWOAT

Tropical Weather Outlook...Corrected
NWS National Hurricane Center Miami FL
800 PM EDT Sat Sep 11 2021

Corrected to change the order of the system northeast of the Azores.

For the North Atlantic...Caribbean Sea and the Gulf of Mexico:

A tropical wave and an upper-level trough continue to produce a
large area of disorganized showers and thunderstorms over portions
of southeastern Mexico and the southern and central Gulf of Mexico.
Upper-level winds are gradually becoming more conducive for
development, and a tropical depression is likely to form on Sunday
or Monday while the disturbance moves northwestward and then
northward near the coast of northeastern Mexico.  Additional
development will be possible through the middle of next week if the
system remains over water, and interests along the western and
northwestern Gulf coast should monitor the progress of this system.
An Air Force Hurricane Hunter aircraft is scheduled to investigate
the system tomorrow, if necessary.

Regardless of development, this disturbance will continue to produce
heavy rain across portions of southern Mexico, including the western
Yucatan Peninsula, through tonight which may lead to flash flooding
and mudslides. By late Sunday, heavy rain is expected to reach
portions of the Texas and Louisiana coasts with a heavy rain threat
then continuing across those coasts through the middle of next week.
Localized significant rainfall amounts are possible, potentially
resulting in areas of flash, urban, and isolated river flooding.
* Formation chance through 48 hours...high...90 percent.
* Formation chance through 5 days...high...90 percent.

Showers and thunderstorms remain poorly organized in association
with a tropical wave located near the Cabo Verde Islands.
Environmental conditions are currently conducive for development,
and a tropical depression could still form this weekend or early
next week while the system moves westward over the far eastern
Atlantic. By the middle of next week, stronger upper-level winds and
marginally warm ocean temperatures are expected to limit additional
development. Regardless of development, this disturbance is likely
to bring gusty winds and locally heavy rain across the Cabo Verde
Islands tonight.
* Formation chance through 48 hours...medium...50 percent.
* Formation chance through 5 days...medium...50 percent.

A non-tropical area of low pressure is located over the far
northeastern Atlantic several hundred miles northeast of the
Azores. This system is forecast to move south-southeastward towards
warmer waters, which could allow the low to gradually acquire some
tropical or subtropical characteristics by the middle of next week.
* Formation chance through 48 hours...low...10 percent.
* Formation chance through 5 days...low...20 percent.

Another tropical wave is expected to move off the west coast of
Africa in a few days. Gradual development of this system is possible
thereafter, and a tropical depression could from by the middle of
next week while it moves westward across the eastern tropical
Atlantic Ocean.
* Formation chance through 48 hours...low...near 0 percent.
* Formation chance through 5 days...medium...40 percent.

An area of low pressure is expected to form near the southeastern
Bahamas in a few days resulting from moisture by a tropical wave
interacting with an upper-level trough. Gradual development of this
system is possible thereafter as it moves northwestward across the
western Atlantic.
* Formation chance through 48 hours...low...near 0 percent.
* Formation chance through 5 days...low...30 percent.

$$
Forecaster Papin
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