佛得角西南91L - 12.1N 34.2W - NHC:60%

ygsj24

91L INVEST 250904 1200 12.1N 33.5W ATL 20 1011

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1. Tropical Atlantic:
Showers and thunderstorms associated with a tropical wave located
over the eastern tropical Atlantic several hundred miles
west-southwest of the Cabo Verde Islands have started to consolidate
and become slightly better organized.  Environmental conditions are
conducive for development of this system during the next several
days, and a tropical depression is likely to form late this week or
this weekend over central tropical Atlantic while moving slowly
toward the west-northwest at 5 to 10 mph.  The system is likely to
move faster toward the west or west-northwest thereafter and reach
the waters east of the Lesser Antilles by the middle of next week.
* Formation chance through 48 hours...medium...50 percent.
* Formation chance through 7 days...high...80 percent.

ygsj24

000
ABNT20 KNHC 041752
TWOAT

Tropical Weather Outlook
NWS National Hurricane Center Miami FL
Issued by the NWS Weather Prediction Center College Park MD
200 PM EDT Thu Sep 4 2025

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

Tropical Atlantic (AL91):
A broad area of low pressure has formed along a tropical wave over  
the eastern tropical Atlantic. Recent satellite imagery suggests the
system continues to slowly become better organized with shower and
thunderstorm activity along its eastern periphery. Environmental
conditions are favorable for additional development of the system
and a tropical depression is likely to form by this weekend as it
moves slowly westward at 5 to 10 mph across the eastern and central
tropical Atlantic. Interests in the Lesser Antilles and Leeward
Islands should monitor the progress of this system as it approaches
from the east by the middle of next week.
* Formation chance through 48 hours...medium...60 percent.
* Formation chance through 7 days...high...90 percent.

$$
Forecaster Kleebauer/Papin

ygsj24

000
ABNT20 KNHC 051735
TWOAT

Tropical Weather Outlook
NWS National Hurricane Center Miami FL
200 PM EDT Fri Sep 5 2025

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

Tropical Atlantic (AL91):
Shower and thunderstorm activity is currently limited and
disorganized in association with a tropical wave over the central
tropical Atlantic. Although upper-level winds are generally
favorable for development, environmental dry air is likely to limit
development over the next couple of days. However, a tropical
depression could still form early next week as the system moves
westward at around 10 mph across the central tropical Atlantic. This
system is likely to be near the Lesser Antilles by the middle to
latter part of next week, and interests there should monitor its
progress.
* Formation chance through 48 hours...medium...40 percent.
* Formation chance through 7 days...high...70 percent.

$$
Forecaster Hagen

ygsj24

291
ABNT20 KNHC 052313
TWOAT

Tropical Weather Outlook
NWS National Hurricane Center Miami FL
800 PM EDT Fri Sep 5 2025

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

Tropical Atlantic (AL91):
Shower and thunderstorm activity remains limited in association with
a tropical wave over the central tropical Atlantic. A drier air mass
is limiting the potential for development over the next couple of
days, and environmental conditions will remain only marginally
favorable thereafter. A tropical depression could form during the
early to middle part of next week as the system moves westward at
around 10 mph across the central tropical Atlantic. This system is
likely to be near the Lesser Antilles by the middle to latter part
of next week, and interests there should monitor its progress.
* Formation chance through 48 hours...low...30 percent.
* Formation chance through 7 days...medium...60 percent.

$$
Forecaster Kelly

ygsj24

000
ABNT20 KNHC 061139
TWOAT

Tropical Weather Outlook
NWS National Hurricane Center Miami FL
800 AM EDT Sat Sep 6 2025

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

Tropical Atlantic (AL91):
A tropical wave over the central tropical Atlantic is producing a
small area of disorganized showers and thunderstorms.  Environmental
conditions are only marginally conducive for development, and the
chances of this system becoming a tropical depression are
decreasing.  The wave is expected to move generally westward at 10
to 15 mph, and will likely be near the Lesser Antilles by the middle
part of next week.  Interests there should monitor its progress.
* Formation chance through 48 hours...low...30 percent.
* Formation chance through 7 days...low...30 percent.

$$
Forecaster Roberts/Pasch

ygsj24

163
ABNT20 KNHC 061715
TWOAT

Tropical Weather Outlook
NWS National Hurricane Center Miami FL
200 PM EDT Sat Sep 6 2025

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

Tropical Atlantic (AL91):
A tropical wave over the central tropical Atlantic is producing a
small area of shower activity.  Environmental conditions are only
marginally conducive for development, and the chances of this
system becoming a tropical depression continue to diminish.  The
wave is expected to move generally westward at 10 to 15 mph, and
will likely be near the Lesser Antilles by the middle part of next
week.  Interests there should monitor its progress.
* Formation chance through 48 hours...low...20 percent.
* Formation chance through 7 days...low...20 percent.

$$
Forecaster Roberts

ygsj24

000
ABNT20 KNHC 062320
TWOAT

Tropical Weather Outlook
NWS National Hurricane Center Miami FL
800 PM EDT Sat Sep 6 2025

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

Tropical Atlantic:
A tropical wave over the central tropical Atlantic is producing a
limited amount of shower activity. Development of this system is
not expected while the system moves westward at 10 to 15 mph.
* Formation chance through 48 hours...low...near 0 percent.
* Formation chance through 7 days...low...near 0 percent.

$$
Forecaster Cangialosi/Kelly