National Hurricane Center (NHC) Pacific Map

000
ABPZ20 KNHC 280907
TWOEP

Special Tropical Weather Outlook
NWS National Hurricane Center Miami FL
210 AM PDT Mon Jul 28 2025

For the eastern and central North Pacific east of 180 longitude:

Special outlook issued to include a recently formed area of low
pressure southeast of the Hawaiian Islands.

Active Systems:
The National Hurricane Center is issuing advisories on Tropical
Storm Iona, located in the central Pacific basin well southeast of
the Hawaiian Islands.

Western East Pacific:
An area of low pressure well east-southeast of the Hawaiian Islands
is producing disorganized showers and thunderstorms. Gradual
development of this system is possible and a tropical depression
could form during the next couple of days as it moves generally
westward around 10 mph.
* Formation chance through 48 hours...medium...40 percent.
* Formation chance through 7 days...medium...40 percent.

South of Southwestern Mexico:
A disturbance located several hundred miles south-southwest of the
Gulf of Tehuantepec is producing a large area of disorganized
showers and thunderstorms. During the next day or two, an area of
low pressure is forecast to form from this area of disturbed
weather, well off the coast of southwestern Mexico. Thereafter,
environmental conditions appear conducive for gradual development of
this system, and a tropical depression is likely to form late this
week as it moves west-northwestward or northwestward at 10 to 15
mph.
* Formation chance through 48 hours...low...20 percent.
* Formation chance through 7 days...high...70 percent.

Eastern portion of the Central Pacific:
Updated: Satellite derived winds indicate that a small area of low
pressure has formed around 1000 miles southeast of the Hawaiian
Islands. If deep convection persists, a short lived tropical
depression or tropical storm could develop later today.
* Formation chance through 48 hours...medium...50 percent.
* Formation chance through 7 days...medium...50 percent.

&&

Public advisories on Tropical Storm Iona are issued under WMO header
WTPA31 PHFO and under AWIPS header HFOTCPCP1.
Forecast/Advisories on Tropical Storm Iona are issued under WMO
header WTPA21 PHFO and under AWIPS header HFOTCMCP1.

$$
Forecaster Jelsema

915
ABPZ20 KNHC 280513
TWOEP

Tropical Weather Outlook
NWS National Hurricane Center Miami FL
1100 PM PDT Sun Jul 27 2025

For the eastern and central North Pacific east of 180 longitude:

Active Systems:
The National Hurricane Center is issuing advisories on Tropical
Storm Iona, located in the central Pacific basin well southeast of
the Hawaiian Islands.

Western East Pacific:
An area of low pressure well east-southeast of the Hawaiian Islands
is producing disorganized showers and thunderstorms. Gradual
development of this system is possible and a tropical depression
could form during the next couple of days as it moves generally
westward around 10 mph.
* Formation chance through 48 hours...medium...40 percent.
* Formation chance through 7 days...medium...40 percent.

South of Southwestern Mexico:
A disturbance located several hundred miles south-southwest of the
Gulf of Tehuantepec is producing a large area of disorganized
showers and thunderstorms. During the next day or two, an area of
low pressure is forecast to form from this area of disturbed
weather, well off the coast of southwestern Mexico. Thereafter,
environmental conditions appear conducive for gradual development of
this system, and a tropical depression is likely to form late this
week as it moves west-northwestward or northwestward at 10 to 15
mph.
* Formation chance through 48 hours...low...20 percent.
* Formation chance through 7 days...high...70 percent.

&&

Public advisories on Tropical Storm Iona are issued under WMO header
WTPA31 PHFO and under AWIPS header HFOTCPCP1.
Forecast/Advisories on Tropical Storm Iona are issued under WMO
header WTPA21 PHFO and under AWIPS header HFOTCMCP1.

$$
Forecaster Jelsema

000
ABPZ20 KNHC 272317
TWOEP

Tropical Weather Outlook
NWS National Hurricane Center Miami FL
500 PM PDT Sun Jul 27 2025

For the eastern and central North Pacific east of 180 longitude:

Active Systems:
The National Hurricane Center is issuing advisories on Tropical
Depression One-C, located in the central Pacific basin well
southeast of the Hawaiian Islands.

Western East Pacific:
A low pressure area has formed well east-southeast of the Hawaiian
Islands. While the associated thunderstorm activity is currently
disorganized, gradual development of this system is possible during
the next couple of days while it moves generally westward around
10 mph.
* Formation chance through 48 hours...medium...40 percent.
* Formation chance through 7 days...medium...40 percent.

South of Southwestern Mexico:
An area of disturbed weather has developed several hundred miles
south-southwest of the Gulf of Tehuantepec. During the next day or
two, an area of low pressure is forecast to form from this system
well offshore of the southwestern coast of Mexico. Thereafter,
environmental conditions appear conducive for gradual development,
and a tropical depression is likely to form late this week as the
system moves west-northwestward or northwestward at 10 to 15 mph.
* Formation chance through 48 hours...low...10 percent.
* Formation chance through 7 days...high...70 percent.

&&

Public advisories on Tropical Depression One-C are issued under WMO
header WTPA31 PHFO and under AWIPS header HFOTCPCP1.
Forecast/Advisories on Tropical Depression One-C are issued under
WMO header WTPA21 PHFO and under AWIPS header HFOTCMCP1.

$$
Forecaster Beven

659
ABPZ20 KNHC 271719
TWOEP

Tropical Weather Outlook
NWS National Hurricane Center Miami FL
1100 AM PDT Sun Jul 27 2025

For the eastern and central North Pacific east of 180 longitude:

Active Systems:
The National Hurricane Center is issuing advisories on Tropical
Depression One-C, located in the central Pacific basin well
southeast of the Hawaiian Islands.

Western East Pacific:
A trough of low pressure well east-southeast of the Hawaiian Islands
is producing a large area of disorganized showers and thunderstorms.
Some gradual development of this system is possible during the next
couple of days while it moves generally westward around 10 mph.
* Formation chance through 48 hours...low...30 percent.
* Formation chance through 7 days...low...30 percent.

South of Southwestern Mexico:
An area of low pressure is forecast to form well offshore of the
southwestern coast of Mexico in a couple of days. Thereafter,
environmental conditions appear conducive for gradual development,
and a tropical depression could form late this week as the system
moves west-northwestward or northwestward at 10 to 15 mph.
* Formation chance through 48 hours...low...near 0 percent.
* Formation chance through 7 days...medium...60 percent.

&&

Public advisories on Tropical Depression One-C are issued under WMO
header WTPA31 PHFO and under AWIPS header HFOTCPCP1. Forecast
advisories on Tropical Depression One-C are issued under WMO header
WTPA21 PHFO and under AWIPS header HFOTCMCP1.

$$
Forecaster Cangialosi

909
ABPZ20 KNHC 271139
TWOEP

Tropical Weather Outlook
NWS National Hurricane Center Miami FL
500 AM PDT Sun Jul 27 2025

For the eastern and central North Pacific east of 180 longitude:

Active Systems:
The National Hurricane Center is issuing advisories on Tropical
Depression One-C, located in the central Pacific basin well
southeast of the Hawaiian Islands.

Western East Pacific:
A trough of low pressure well east-southeast of the Hawaiian Islands
is producing a large area of disorganized showers and thunderstorms.
Some gradual development of this system is possible during the next
few days while it moves generally westward around 10 mph.
* Formation chance through 48 hours...low...30 percent.
* Formation chance through 7 days...low...30 percent.

South of Southwestern Mexico:
An area of low pressure is forecast to form well offshore of the
southwestern coast of Mexico in a couple of days. Thereafter,
environmental conditions appear conducive for gradual development,
and a tropical depression could form late this week as the system
moves west-northwestward or northwestward at 10 to 15 mph.
* Formation chance through 48 hours...low...near 0 percent.
* Formation chance through 7 days...medium...50 percent.

&&

Public advisories on Tropical Depression One-C are issued under WMO
header WTPA31 PHFO and under AWIPS header HFOTCPCP1. Forecast
advisories on Tropical Depression One-C are issued under WMO header
WTPA21 PHFO and under AWIPS header HFOTCMCP1.

$$
Forecaster Cangialosi/Kelly

835
ABPZ20 KNHC 270524
TWOEP

Tropical Weather Outlook
NWS National Hurricane Center Miami FL
1100 PM PDT Sat Jul 26 2025

For the eastern and central North Pacific east of 180 longitude:

Eastern portion of the Central Pacific (CP90):
Showers and thunderstorms associated with an area of low pressure
about 900 miles southeast of the Hawaiian Islands have become better
organized since earlier today. Additional development of this system
is expected and a tropical depression is likely to form later
tonight or Sunday as it moves generally westward around 10 mph, well
to the south of the Hawaiian Islands.
* Formation chance through 48 hours...high...80 percent.
* Formation chance through 7 days...high...80 percent.

Western East Pacific:
A trough of low pressure about 1700 miles east-southeast of the
Hawaiian Islands is producing a large area of disorganized showers
and thunderstorms. Some gradual development of this system is
possible during the next few days at it moves generally westward
around 10 mph.
* Formation chance through 48 hours...low...30 percent.
* Formation chance through 7 days...low...30 percent.

South of Southwestern Mexico:
An area of low pressure is forecast to form well offshore of the
southwestern coast of Mexico early next week. Thereafter,
environmental conditions appear conducive for gradual development,
and a tropical depression could form during the middle to latter
part of next week as the system moves west-northwestward or
northwestward at 10 to 15 mph.
* Formation chance through 48 hours...low...near 0 percent.
* Formation chance through 7 days...medium...40 percent.

$$
Forecaster Jelsema

846
ABPZ20 KNHC 262338
TWOEP

Tropical Weather Outlook
NWS National Hurricane Center Miami FL
500 PM PDT Sat Jul 26 2025

For the eastern and central North Pacific east of 180 longitude:

Eastern portion of Central Pacific (CP90):
Showers and thunderstorms have become slightly better organized in
association with an area of low pressure located about 950 miles
southeast of the Hawaiian Islands. Additional development of this
system is expected as it moves generally westward staying well south
of the Hawaiian Islands, and a short-lived tropical depression is
likely to form during the next few days.
* Formation chance through 48 hours...medium...60 percent.
* Formation chance through 7 days...high...70 percent.

Western East Pacific:
A trough of low pressure about 1500 miles east-southeast of the
Hawaiian Islands is producing a large area of disorganized showers
and thunderstorms. Some slow development of this system is possible
as it moves generally westward during the next several days.
* Formation chance through 48 hours...low...20 percent.
* Formation chance through 7 days...low...30 percent.

South of Southwestern Mexico:
An area of low pressure is forecast to form well offshore of the
southwestern coast of Mexico early next week. Thereafter,
environmental conditions appear conducive for gradual development,
and a tropical depression could form during the middle to latter
part of next week as the system moves west-northwestward or
northwestward at 10 to 15 mph.
* Formation chance through 48 hours...low...near 0 percent.
* Formation chance through 7 days...medium...40 percent.

$$
Forecaster Bucci

981
ABPZ20 KNHC 261710
TWOEP

Tropical Weather Outlook
NWS National Hurricane Center Miami FL
1100 AM PDT Sat Jul 26 2025

For the eastern and central North Pacific east of 180 longitude:

Eastern portion of Central Pacific (CP90):
Showers and thunderstorms remain limited and disorganized in
association with an area of low pressure located about 1000 miles
east-southeast of the Hawaiian Islands. Some gradual development of
this system is possible, and a tropical depression could form
before it moves into less conducive environmental conditions by
the middle of next week. This system is forecast to move westward
during the next several days well south of the Hawaiian Islands.
* Formation chance through 48 hours...medium...50 percent.
* Formation chance through 7 days...medium...60 percent.

Western East Pacific:
A trough of low pressure centered a little more than 1500 miles
east-southeast of the Hawaiian Islands is producing a large area of
disorganized showers and thunderstorms. Some slow development of
this system is possible as it moves generally westward during the
next several days.
* Formation chance through 48 hours...low...10 percent.
* Formation chance through 7 days...low...20 percent.

South of Southwestern Mexico:
An area of low pressure is forecast to form well offshore of the
southwestern coast of Mexico early next week. Thereafter,
environmental conditions appear conducive for gradual development,
and a tropical depression could form during the middle to latter
part of next week as the system moves west-northwestward or
northwestward at 10 to 15 mph.
* Formation chance through 48 hours...low...near 0 percent.
* Formation chance through 7 days...medium...40 percent.

$$
Forecaster Cangialosi

000
ABPZ20 KNHC 261135
TWOEP

Tropical Weather Outlook
NWS National Hurricane Center Miami FL
500 AM PDT Sat Jul 26 2025

For the eastern and central North Pacific east of 180 longitude:

Eastern portion of Central Pacific (CP90):
Showers and thunderstorms remain limited and disorganized in
association with an area of low pressure located about 1000 miles
east-southeast of the Hawaiian Islands. Some gradual development of
this system is possible, and a tropical depression could form
before it moves into less conducive environmental conditions by
the middle of next week. This system is forecast to move westward
during the next several days well south of the Hawaiian Islands.
* Formation chance through 48 hours...medium...50 percent.
* Formation chance through 7 days...medium...60 percent.

Western East Pacific:
A trough of low pressure centered about 1500 miles east-southeast of
the Hawaiian Islands is producing a large area of disorganized
showers and thunderstorms. Some slow development of this system is
possible as it moves generally westward during the next several
days.
* Formation chance through 48 hours...low...10 percent.
* Formation chance through 7 days...low...20 percent.

South of Southwestern Mexico:
An area of low pressure is forecast to form well offshore of the
southwestern coast of Mexico early next week. Thereafter,
environmental conditions appear conducive for gradual development,
and a tropical depression could form during the middle to latter
part of next week as the system moves generally west-northwestward
at 10 to 15 mph.
* Formation chance through 48 hours...low...near 0 percent.
* Formation chance through 7 days...medium...40 percent.

$$
Forecaster Cangialosi

878
ABPZ20 KNHC 260542
TWOEP

Tropical Weather Outlook
NWS National Hurricane Center Miami FL
1100 PM PDT Fri Jul 25 2025

For the eastern and central North Pacific east of 180 longitude:

Eastern portion of Central Pacific (CP90):
Showers and thunderstorms associated with a broad area of low
pressure located around 1100 miles southeast of the Hawaiian Islands
have decreased since earlier today. Some gradual development of this
system is possible, and a tropical depression could form this
weekend or early next week as it moves generally westward at 10 to
15 mph across the Central Pacific basin.
* Formation chance through 48 hours...medium...50 percent.
* Formation chance through 7 days...medium...60 percent.

South of Southwestern Mexico:
An area of low pressure is forecast to form offshore of the
southwestern coast of Mexico early next week. Thereafter,
environmental conditions appear conducive for some development and a
tropical depression could form during the middle to latter part of
next week as the system moves generally west-northwestward at 10 to
15 mph.
* Formation chance through 48 hours...low...near 0 percent.
* Formation chance through 7 days...medium...40 percent.

Western East Pacific:
An area of low pressure is forecast to develop over 1500 miles
east-southeast of the Hawaiian Islands during the next day or two.
Some gradual development is possible thereafter, as the system moves
generally westward around 10 mph.
* Formation chance through 48 hours...low...10 percent.
* Formation chance through 7 days...low...20 percent.

$$
Forecaster Jelsema

727
ABPZ20 KNHC 252315
TWOEP

Tropical Weather Outlook
NWS National Hurricane Center Miami FL
500 PM PDT Fri Jul 25 2025

For the eastern and central North Pacific east of 180 longitude:

Eastern portion of Central Pacific (CP90):
An area of low pressure located well southeast of the Hawaiian
Islands is producing a large area of showers and thunderstorms.
Some gradual development of this system is possible, and a tropical
depression could form this weekend or early next week as it moves
generally westward at 10 to 15 mph across the Central Pacific basin.
* Formation chance through 48 hours...medium...50 percent.
* Formation chance through 7 days...medium...60 percent.

Central East Pacific:
An area of low pressure is forecast to form offshore of the
southwestern coast of Mexico early next week. Thereafter,
environmental conditions appear conducive for some development and a
tropical depression could form during the middle to latter part of
next week as the system moves generally west-northwestward at 10 to
15 mph.
* Formation chance through 48 hours...low...near 0 percent.
* Formation chance through 7 days...medium...40 percent.

$$
Forecaster Bucci

000
ABPZ20 KNHC 251727
TWOEP

Tropical Weather Outlook
NWS National Hurricane Center Miami FL
1100 AM PDT Fri Jul 25 2025

For the eastern and central North Pacific east of 180 longitude:

Well Southeast of the Hawaiian Islands(EP97):
An area of low pressure located well southeast of the Hawaiian
Islands is producing a large area of showers and thunderstorms.
Some gradual development of this system is possible, and a tropical
depression could form this weekend or early next week as it
moves generally westward at 10 to 15 mph across the far western
portion of the eastern Pacific and into the Central Pacific basin.
* Formation chance through 48 hours...medium...40 percent.
* Formation chance through 7 days...medium...60 percent.

Central East Pacific:
An area of low pressure is forecast to form offshore of the
southwestern coast of Mexico early next week. Thereafter,
environmental conditions appear conducive for some development as
the system moves generally west-northwestward at 10 to 15 mph.
* Formation chance through 48 hours...low...near 0 percent.
* Formation chance through 7 days...low...30 percent.

$$
Forecaster Kelly

000
ABPZ20 KNHC 251149
TWOEP

Tropical Weather Outlook
NWS National Hurricane Center Miami FL
500 AM PDT Fri Jul 25 2025

For the eastern and central North Pacific east of 180 longitude:

Well Southeast of the Hawaiian Islands:
An area of low pressure located well southeast of the Hawaiian
Islands is producing a large area of showers and thunderstorms.
Some gradual development of this system is possible, and a tropical
depression could form late this weekend or early next week as it
moves generally westward at 10 to 15 mph across the far western
portion of the eastern Pacific and into the Central Pacific basin.
* Formation chance through 48 hours...low...20 percent.
* Formation chance through 7 days...medium...50 percent.

Central East Pacific:
An area of low pressure is forecast to form offshore of the
southwestern coast of Mexico early next week. Thereafter,
environmental conditions appear conducive for some development as
the system moves generally west-northwestward at 10 to 15 mph.
* Formation chance through 48 hours...low...near 0 percent.
* Formation chance through 7 days...low...30 percent.

$$
Forecaster Kelly

358
ABPZ20 KNHC 250504
TWOEP

Tropical Weather Outlook
NWS National Hurricane Center Miami FL
1100 PM PDT Thu Jul 24 2025

For the eastern and central North Pacific east of 180 longitude:

Well Southeast of the Hawaiian Islands:
Disorganized showers and thunderstorms associated with a broad
trough of low pressure located well southeast of the Hawaiian
Islands continue. Some gradual development of this system is
possible, and a tropical depression could form late this weekend or
early next week as it moves generally westward at 10 to 15 mph
across the far western portion of the eastern Pacific and into the
Central Pacific basin.
* Formation chance through 48 hours...low...10 percent.
* Formation chance through 7 days...medium...40 percent.

Central East Pacific:
An area of low pressure is forecast to form offshore of the
southwestern coast of Mexico early next week. Thereafter,
environmental conditions appear conducive for some development as
the system moves generally west-northwestward at 10 to 15 mph.
* Formation chance through 48 hours...low...near 0 percent.
* Formation chance through 7 days...low...20 percent.

$$
Forecaster Gibbs

000
ABPZ20 KNHC 242304
TWOEP

Tropical Weather Outlook
NWS National Hurricane Center Miami FL
500 PM PDT Thu Jul 24 2025

For the eastern and central North Pacific east of 180 longitude:

Well Southeast of the Hawaiian Islands:
Disorganized showers and thunderstorms associated with a broad
trough of low pressure located well southeast of the Hawaiian
Islands continue. Some gradual development of this system is
possible, and a tropical depression could form late this weekend or
early next week as it moves generally westward at 10 to 15 mph.
* Formation chance through 48 hours...low...near 0 percent.
* Formation chance through 7 days...medium..40 percent.

$$
Forecaster Gibbs

000
ABPZ20 KNHC 241725
TWOEP

Tropical Weather Outlook
NWS National Hurricane Center Miami FL
1100 AM PDT Thu Jul 24 2025

For the eastern and central North Pacific east of 180 longitude:

Well Southeast of the Hawaiian Islands:
An area of low pressure is forecast to develop well to the southeast
of the Hawaiian Islands by this weekend. Thereafter, some gradual
development is possible and a tropical depression could form while
the system moves generally westward at 10 to 15 mph.
* Formation chance through 48 hours...low...near 0 percent.
* Formation chance through 7 days...medium..40 percent.

$$
Forecaster Pasch

000
ABPZ20 KNHC 241136
TWOEP

Tropical Weather Outlook
NWS National Hurricane Center Miami FL
500 AM PDT Thu Jul 24 2025

For the eastern and central North Pacific east of 180 longitude:

Well Southeast of the Hawaiian Islands:
An area of low pressure is forecast to develop well to the southeast
of the Hawaiian Islands by this weekend. Thereafter, some gradual
development is possible and a tropical depression could form while
the system moves generally westward at 10 to 15 mph.
* Formation chance through 48 hours...low...near 0 percent.
* Formation chance through 7 days...medium..40 percent.

$$
Forecaster Pasch

000
ABPZ20 KNHC 240501
TWOEP

Tropical Weather Outlook
NWS National Hurricane Center Miami FL
1100 PM PDT Wed Jul 23 2025

For the eastern and central North Pacific east of 180 longitude:

Well Southeast of the Hawaiian Islands:
An area of low pressure is forecast to develop well to the southeast
of the Hawaiian Islands by this weekend. Thereafter, some gradual
development is possible while the system moves generally westward at
10 to 15 mph.
* Formation chance through 48 hours...low...near 0 percent.
* Formation chance through 7 days...low...30 percent.

$$
Forecaster Gibbs/Papin

000
ABPZ20 KNHC 232310
TWOEP

Tropical Weather Outlook
NWS National Hurricane Center Miami FL
500 PM PDT Wed Jul 23 2025

For the eastern and central North Pacific east of 180 longitude:

Well Southeast of the Hawaiian Islands:
An area of low pressure is forecast to develop well to the southeast
of the Hawaiian Islands by this weekend. Thereafter, some gradual
development is possible while the system moves generally westward at
10 to 15 mph.
* Formation chance through 48 hours...low...near 0 percent.
* Formation chance through 7 days...low...30 percent.

$$
Forecaster Papin/Gibbs

000
ABPZ20 KNHC 222325
TWOEP

Tropical Weather Outlook
NWS National Hurricane Center Miami FL
500 PM PDT Tue Jul 22 2025

For the eastern and central North Pacific east of 180 longitude:

Well Southeast of the Hawaiian Islands:
An area of low pressure is expected to form well southeast of the
Hawaiian Islands this weekend. Thereafter, some gradual development
is possible as the system moves generally westward at 10 to 15 mph.

* Formation chance through 48 hours...low...near 0 percent.
* Formation chance through 7 days...low...20 percent.

$$
Forecaster Papin/Gibbs