Overall Green Tropical Cyclone for HANNA-26 Off-shore from 28 Sep 2026 15:00 UTC to 21:00

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Overall Green Tropical Cyclone for HANNA-26

Off-shore

Global Telecommunication Service

GTS (Global Telecommunication Service) is the official Warning and Alerting channel by the World Meteorological Organization (WMO) adopted by several Warning Organizations. As soon as a new GTS message regarding Tropical Cyclones(WT) or Tsunami(WE) the messages are processed and possibly assigned to the specific event. When a new GTS message is present an new tab in the specific event report page is present.The presence of a GTS message is shown in the homepage with a dedicated icon.

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Measurements Levels

SOURCE	GAUGE LOCATION	LAT	LON	TIME (UTC)	HEIGHT (m)	PERIOD (min)

28/09 20:45 WTNT43KNHC282043

28/09 20:42 WTNT33KNHC282040

28/09 20:41 WTNT23KNHC282039

28/09 15:02 WTNT33KNHC281500

28/09 15:02 WTNT43KNHC281500

28/09 15:01 WTNT23KNHC281459

Original Message :

WTNT43 KNHC 282043
TCDAT3

Tropical Storm Hanna Discussion Number 2
NWS National Hurricane Center Miami FL AL082026
500 PM AST Mon Sep 28 2026

Since this morning, Hanna's convective structure has become a little
more disheveled with the tropical storm is affected by 20-25 kt of
westerly vertical wind shear. There has not been an appreciable
change in the subjective or objective intensity estimates this
afternoon, and the initial intensity is held at 40 kt.

The initial motion of Hanna is east-southeastward at 115 degrees at
15 kt. Hanna is embedded in the flow in between a longwave trough to
its northeast, and a larger subtropical ridge to its south. This
synoptic pattern should result in a continued east-southeastward
motion over the next 24-36 hours with some gradually slow down in
the track as the mid-latitude trough leaves Hanna behind. Much of
the track guidance then shows a slow east-northeastward motion
after the cyclone becomes more vertically shallow and becomes
influenced by a low-level ridge centered south of the Azores. The
NHC track forecast is very similar to the previous one, roughly in
between the simple (TVCN) and corrected consensus (HCCA) aids.

Vertical wind shear over Hanna is expected to persist in over the
next 48-72 h, though because the tropical storm is currently moving
in the same direction as the shear vector, bursts of deep convection
down-shear of the center may allow for some slight intensification,
which is reflected in the HCCA intensity guidance. However, when
Hanna slows down and turned more east-northeastward, the shear is
expected to shift more out of the north, importing very dry
tropospheric air into the circulation. Simulated satellite imagery
from the ECMWF and hurricane-regional models still show convection
ceasing over the storm in around 60 h, marking its transition to a
post-tropical cyclone in the forecast.

FORECAST POSITIONS AND MAX WINDS

INIT 28/2100Z 36.5N 48.7W 40 KT 45 MPH
12H 29/0600Z 35.5N 46.1W 45 KT 50 MPH
24H 29/1800Z 34.3N 44.3W 45 KT 50 MPH
36H 30/0600Z 33.9N 43.4W 40 KT 45 MPH
48H 30/1800Z 34.2N 42.5W 35 KT 40 MPH
60H 01/0600Z 34.8N 41.0W 30 KT 35 MPH...POST-TROP/REMNT LOW
72H 01/1800Z 36.0N 38.6W 30 KT 35 MPH...POST-TROP/REMNT LOW
96H 02/1800Z...DISSIPATED

$$
Forecaster Papin

Original Message :

WTNT33 KNHC 282040
TCPAT3

BULLETIN
Tropical Storm Hanna Advisory Number 2
NWS National Hurricane Center Miami FL AL082026
500 PM AST Mon Sep 28 2026

...HANNA FORECAST TO BE A SHORT LIVED TROPICAL STORM AS IT MOVES
EASTWARD ACROSS THE CENTRAL SUBTROPICAL ATLANTIC...

SUMMARY OF 500 PM AST...2100 UTC...INFORMATION
----------------------------------------------
LOCATION...36.5N 48.7W
ABOUT 960 MI...1545 KM ENE OF BERMUDA
ABOUT 1195 MI...1920 KM W OF THE AZORES
MAXIMUM SUSTAINED WINDS...45 MPH...75 KM/H
PRESENT MOVEMENT...ESE OR 115 DEGREES AT 17 MPH...28 KM/H
MINIMUM CENTRAL PRESSURE...1006 MB...29.71 INCHES

WATCHES AND WARNINGS
--------------------
There are no coastal watches or warnings in effect.

DISCUSSION AND OUTLOOK
----------------------
At 500 PM AST (2100 UTC), the center of Tropical Storm Hanna was
located near latitude 36.5 North, longitude 48.7 West. Hanna is
moving toward the east-southeast near 17 mph (28 km/h). A
general east-southeast motion is forecast over the next day or two
followed by a turn to the east-northeast.

Maximum sustained winds are near 45 mph (75 km/h) with higher gusts.
Only slight intensification is forecast in the short-term and Hanna
is likely to become a post-tropical cyclone by the latter part of
this week.

Tropical-storm-force winds extend outward up to 90 miles (150 km)
from the center.

The estimated minimum central pressure is 1006 mb (29.71 inches).

HAZARDS AFFECTING LAND
----------------------
None.

NEXT ADVISORY
-------------
Next complete advisory at 1100 PM AST.

$$
Forecaster Papin

Original Message :

WTNT23 KNHC 282039
TCMAT3

TROPICAL STORM HANNA FORECAST/ADVISORY NUMBER 2
NWS NATIONAL HURRICANE CENTER MIAMI FL AL082026
2100 UTC MON SEP 28 2026

TROPICAL STORM CENTER LOCATED NEAR 36.5N 48.7W AT 28/2100Z
POSITION ACCURATE WITHIN 25 NM

PRESENT MOVEMENT TOWARD THE EAST-SOUTHEAST OR 115 DEGREES AT 15 KT

ESTIMATED MINIMUM CENTRAL PRESSURE 1006 MB
MAX SUSTAINED WINDS 40 KT WITH GUSTS TO 50 KT.
34 KT....... 60NE 80SE 0SW 0NW.
4 M SEAS.... 0NE 60SE 0SW 0NW.
WINDS AND SEAS VARY GREATLY IN EACH QUADRANT. RADII IN NAUTICAL
MILES ARE THE LARGEST RADII EXPECTED ANYWHERE IN THAT QUADRANT.

REPEAT...CENTER LOCATED NEAR 36.5N 48.7W AT 28/2100Z
AT 28/1800Z CENTER WAS LOCATED NEAR 36.6N 49.6W

FORECAST VALID 29/0600Z 35.5N 46.1W
MAX WIND 45 KT...GUSTS 55 KT.
34 KT... 30NE 60SE 30SW 0NW.

FORECAST VALID 29/1800Z 34.3N 44.3W
MAX WIND 45 KT...GUSTS 55 KT.
34 KT... 30NE 60SE 0SW 30NW.

FORECAST VALID 30/0600Z 33.9N 43.4W
MAX WIND 40 KT...GUSTS 50 KT.
34 KT... 0NE 60SE 0SW 0NW.

FORECAST VALID 30/1800Z 34.2N 42.5W
MAX WIND 35 KT...GUSTS 45 KT.
34 KT... 0NE 40SE 0SW 0NW.

FORECAST VALID 01/0600Z 34.8N 41.0W...POST-TROP/REMNT LOW
MAX WIND 30 KT...GUSTS 40 KT.

FORECAST VALID 01/1800Z 36.0N 38.6W...POST-TROP/REMNT LOW
MAX WIND 30 KT...GUSTS 40 KT.

EXTENDED OUTLOOK. NOTE...ERRORS FOR TRACK HAVE AVERAGED NEAR 125 NM
ON DAY 4 AND 175 NM ON DAY 5...AND FOR INTENSITY NEAR 15 KT EACH DAY

OUTLOOK VALID 02/1800Z...DISSIPATED

REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 36.5N 48.7W

NEXT ADVISORY AT 29/0300Z

$$
FORECASTER PAPIN

Original Message :

WTNT33 KNHC 281500
TCPAT3

BULLETIN
Tropical Storm Hanna Advisory Number 1
NWS National Hurricane Center Miami FL AL082026
1100 AM AST Mon Sep 28 2026

...TROPICAL STORM HANNA FORMS IN THE CENTRAL SUBTROPICAL ATLANTIC...

SUMMARY OF 1100 AM AST...1500 UTC...INFORMATION
-----------------------------------------------
LOCATION...36.6N 50.4W
ABOUT 870 MI...1400 KM ENE OF BERMUDA
MAXIMUM SUSTAINED WINDS...45 MPH...75 KM/H
PRESENT MOVEMENT...E OR 100 DEGREES AT 17 MPH...28 KM/H
MINIMUM CENTRAL PRESSURE...1006 MB...29.71 INCHES

WATCHES AND WARNINGS
--------------------
There are no coastal watches or warnings in effect.

DISCUSSION AND OUTLOOK
----------------------
At 1100 AM AST (1500 UTC), the center of Tropical Storm Hanna was
located near latitude 36.6 North, longitude 50.4 West. Hanna is
moving toward the east near 17 mph (28 km/h). An east to
east-southeast motion is forecast over the next few days.

Satellite wind data indicates that maximum sustained winds
are near 45 mph (75 km/h) with higher gusts. Little change in
strength is forecast during the next couple of days.

Tropical-storm-force winds extend outward up to 90 miles (150 km)
from the center.

The estimated minimum central pressure is 1006 mb (29.71 inches).

HAZARDS AFFECTING LAND
----------------------
None

NEXT ADVISORY
-------------
Next complete advisory at 500 PM AST.

$$
Forecaster Brown

Original Message :

WTNT43 KNHC 281500
TCDAT3

Tropical Storm Hanna Discussion Number 1
NWS National Hurricane Center Miami FL AL082026
1100 AM AST Mon Sep 28 2026

Recent scatterometer data shows that the disturbance that NHC has
been tracking over the central subtropical Atlantic has acquired a
well-defined surface circulation and center. Despite significant
westerly shear the system has maintained an area of deep convection
to the east of the center, and the scatterometer data revealed peak
winds of 35 to 40 kt to the southeast of the center. As a result
of this data, the system is being upgraded to 40-kt tropical
storm Hanna at this time.

The shear over the tropical storm is expected to remain strong out
of the west-northwest for the next several days, so little, if any,
strengthening is anticipated. In a couple of days, the shear and
dry mid-level air are likely to cause weakening. Simulated
satellite imagery from the global models indicated the deep
convection is likely to cease in about 60 hours, therefore the NHC
forecast calls for it to become a remnant low at that time.

Hanna is moving eastward at about 15 kt. An eastward to
east-southeastward motion is forecast during the next 24 hours as
the system is embedded along the southern side of the mid-latitude
westerlies. After that time, the westerlies lift northward and the
steering flow will weaken, causing the system to slow down and turn
east-northeastward. The NHC track forecast is close to the HCCA and
GDMI models which are along the southern side of the model envelope.

FORECAST POSITIONS AND MAX WINDS

INIT 28/1500Z 36.6N 50.4W 40 KT 45 MPH
12H 29/0000Z 36.1N 47.7W 40 KT 45 MPH
24H 29/1200Z 34.8N 45.1W 40 KT 45 MPH
36H 30/0000Z 33.9N 43.8W 40 KT 45 MPH
48H 30/1200Z 33.9N 43.3W 35 KT 40 MPH
60H 01/0000Z 34.4N 42.4W 30 KT 35 MPH...POST-TROP/REMNT LOW
72H 01/1200Z 35.3N 40.7W 25 KT 30 MPH...POST-TROP/REMNT LOW
96H 02/1200Z...DISSIPATED

$$
Forecaster Brown

Original Message :

WTNT23 KNHC 281459
TCMAT3

TROPICAL STORM HANNA FORECAST/ADVISORY NUMBER 1
NWS NATIONAL HURRICANE CENTER MIAMI FL AL082026
1500 UTC MON SEP 28 2026

TROPICAL STORM CENTER LOCATED NEAR 36.6N 50.4W AT 28/1500Z
POSITION ACCURATE WITHIN 25 NM

PRESENT MOVEMENT TOWARD THE EAST OR 100 DEGREES AT 15 KT

ESTIMATED MINIMUM CENTRAL PRESSURE 1006 MB
MAX SUSTAINED WINDS 40 KT WITH GUSTS TO 50 KT.
34 KT....... 0NE 80SE 0SW 0NW.
WINDS AND SEAS VARY GREATLY IN EACH QUADRANT. RADII IN NAUTICAL
MILES ARE THE LARGEST RADII EXPECTED ANYWHERE IN THAT QUADRANT.

REPEAT...CENTER LOCATED NEAR 36.6N 50.4W AT 28/1500Z
AT 28/1200Z CENTER WAS LOCATED NEAR 36.7N 51.3W

FORECAST VALID 29/0000Z 36.1N 47.7W
MAX WIND 40 KT...GUSTS 50 KT.
34 KT... 0NE 80SE 0SW 0NW.

FORECAST VALID 29/1200Z 34.8N 45.1W
MAX WIND 40 KT...GUSTS 50 KT.
34 KT... 0NE 80SE 0SW 0NW.

FORECAST VALID 30/0000Z 33.9N 43.8W
MAX WIND 40 KT...GUSTS 50 KT.
34 KT... 0NE 80SE 0SW 0NW.

FORECAST VALID 30/1200Z 33.9N 43.3W
MAX WIND 35 KT...GUSTS 45 KT.
34 KT... 0NE 60SE 0SW 0NW.

FORECAST VALID 01/0000Z 34.4N 42.4W...POST-TROP/REMNT LOW
MAX WIND 30 KT...GUSTS 40 KT.

FORECAST VALID 01/1200Z 35.3N 40.7W...POST-TROP/REMNT LOW
MAX WIND 25 KT...GUSTS 35 KT.

EXTENDED OUTLOOK. NOTE...ERRORS FOR TRACK HAVE AVERAGED NEAR 125 NM
ON DAY 4 AND 175 NM ON DAY 5...AND FOR INTENSITY NEAR 15 KT EACH DAY

OUTLOOK VALID 02/1200Z...DISSIPATED

REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 36.6N 50.4W

NEXT ADVISORY AT 28/2100Z

$$
FORECASTER BROWN

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