[Tropical] Tropical Weather Discussion

[EMWIN Server]

AXNT20 KNHC 221037
TWDAT

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
1205 UTC Sun Oct 22 2023

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 0600 UTC surface analysis and satellite imagery through
0930 UTC.

...SPECIAL FEATURES...

Hurricane Tammy: Hurricane Tammy is centered near 18.5N 62.3W at
22/0900 UTC or 60 nm NNW of Barbuda, moving NNW at 9 kt. Estimated
minimum central pressure is 992 mb. Maximum sustained wind speed
is 75 kt with gusts to 90 kt. Hurricane-force winds extend outward
up to 20 nm, mainly N of the center. Tropical storm-force winds
extend out up to 120 nm in the eastern semicircle. Seas of 12 ft
or greater extend out up to 180 nm, especially N of the center
where peak seas are near 25 ft. Numerous strong convection is
noted from 13N to 20N between 59W and 63W.

Please, consult bulletins and forecasts from your local weather
office. Read the latest HIGH SEAS FORECAST, that is issued by
the National Hurricane Center, at the website -
https://www.nhc.noaa.gov/text/MIAHSFAT2.shtml, and the latest
Tammy NHC Forecast/Advisory and Public Advisory, at
www.hurricanes.gov, for more details.

Eastern Atlantic Storm Warning: The METEO-FRANCE forecast
consists of storm-force winds for the marine areas AGADIR and
MADEIRA. Please, refer to the website,
https://wwmiws.wmo.int/index.php/affiche/2, for details.

...MONSOON TROUGH/ITCZ...

The monsoon trough passes from the coastal plains of SW Senegal
to 09N25W. The ITCZ continues from 09N25W to 06N35W to 06N46W.
Scattered moderate convection extends along the ITCZ from 05N to
17N. Scattered moderate convection is noted within 180 nm of the
monsoon trough axis.

...GULF OF MEXICO...

High pressure of 1015 mb centered near 25N89W is dominating most
of the basin. A weak cold front extends from just S of Tampa Bay
to 27N87W. Most of the basin has light to gentle anticyclonic
flow, but areas W of 94W are experiencing moderate southerly
return flow. Seas are 2 ft or less, except 2 to 4 ft in the areas
of moderate winds.

For the forecast, a cold front will skirt the far NE Gulf
tonight. High pressure will build toward the region from the north
in the wake of these fronts, leading to increasing E winds. Fresh
to locally strong winds are expected Mon through at mid-week.

...CARIBBEAN SEA...

Please read the SPECIAL FEATURES section for details about
Hurricane Tammy.

A weak surface trough extends from Cuba southward to a 1008 mb low
pressure centered near 11N82W. Scattered moderate to isolated
strong convection associated with this low is impacting areas S of
15N and W of 80W. Environmental conditions appear generally
favorable for some development of this low over the next day or
two before it moves inland over Central America by Tue. Scattered
moderate convection, loosely associated with the aforementioned
trough, is also impacting waters from Cuba and Jamaica to
Honduras, including in the vicinity of the Cayman Islands.

Moderate mainly N winds are ongoing in the western Caribbean, with
light to gentle winds in the central and eastern Caribbean areas
that are not being impacted by Tammy. Seas are generally 2 to 4
ft.

For the forecast, Hurricane Tammy is near 18.5N 62.3W at 5 AM
EDT, and is moving north-northwest at 9 kt. Maximum sustained
winds are 75 kt with gusts to 90 kt, and the minimum central
pressure is 992 mb. Tammy will move to 19.5N 62.9W this afternoon,
20.8N 63.5W Mon morning, and 21.9N 63.5W Mon afternoon. Hurricane
Tammy will reach 22.7N 63.1W Tue morning, 23.2N 62.5W Tue
afternoon, and 23.8N 61.9W Wed morning. Tammy will change little
in intensity as it moves farther N of the Leeward Islands early
Thu.

...ATLANTIC OCEAN...

Please read the SPECIAL FEATURES section for details about
Hurricane Tammy as well as storm conditions in the far eastern
Atlantic.

A cold front extends from 31N70W to the central Florida Peninsula.
Associated convection has diminished overnight. Winds behind the
front, N of 28N, are moderate, otherwise light to gentle winds
prevail W of 65W. Elsewhere, a surface trough extends from 31N61W
to the Turks and Caicos Islands. This trough is inducing scattered
moderate convection N of 22N between 59W and 68W. To the E of the
trough, a corridor of moderate to fresh S winds, along with seas
of 8 to 10 ft, extend E to 55W.

In the tropical Atlantic, a surface trough extends from 16N48W SW
to French Guiana, causing scattered moderate convection within 150
nm of its axis. Near the northern vertex of this trough, a
prolonged period of fresh winds has induced some seas of 7 to 9
ft. In the east Atlantic, a cold front extends from the
Moroccan coast to 22N25W to 31W42W. A pre-frontal trough resides
to the S of this front, roughly along 18N. Neither feature is
producing significant convection, but fresh N winds are occurring
behind the front, becoming strong NE of the Canary Islands. Seas
behind the front increase rapidly due to swell generated from
storm conditions to the north. E of 35W, seas are 8 ft or greater
N of 25N and greater than 12 ft E of 30N and N of 28W. Seas of up
to 18 ft are occurring N of the Canary Islands.

For the remainder of area S of 22N and waters between 35W and 55W,
seas are 5 to 7 ft and winds are moderate or less.

For the forecast, hurricane Tammy is near 18.5N 62.3W at 5 AM
EDT, and is moving north-northwest at 9 kt. Maximum sustained
winds are 75 kt with gusts to 90 kt, and the minimum central
pressure is 992 mb. Tammy will move to 19.5N 62.9W this afternoon,
20.8N 63.5W Mon morning, and 21.9N 63.5W Mon afternoon. Hurricane
Tammy will reach 22.7N 63.1W Tue morning, 23.2N 62.5W Tue
afternoon, and 23.8N 61.9W Wed morning. Tammy will change little
in intensity as it moves farther N of the Leeward Islands early
Thu. Farther W, a slow moving cold front stretches from near
Bermuda to the central Florida Peninsula. This front will slide
east and gradually dissipate into tonight. A second cold front
will move off Florida tonight, then move E across the northern
portions of the waters early this week. Looking ahead, high
pressure building in the wake of the front combined with the
impacts of Hurricane Tammy will bring an increase in winds and
seas across the forecast area Tue through Wed night.

$$
KONARIK
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