[Tropical] Tropical Weather Discussion

[EMWIN Server]

AXNT20 KNHC 090611
TWDAT

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
211 AM EDT Sat Sep 9 2017

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 32N. The following information is based on satellite
imagery, weather observations, radar and meteorological analysis.

Based on 0000 UTC surface analysis and satellite imagery through
0515 UTC.

...SPECIAL FEATURES...

At 09/0600 UTC, the center of Hurricane Irma is near 22.3N 78.2W,
or about 239 nm SSE of Miami Florida. Irma is moving W, or 280
degrees, at 11 knots. The estimated minimum central pressure is
930 mb. The maximum sustained wind speeds are 140 kt with gusts to
170 kt. Numerous strong convection is noted within 90 nm of the
center of Irma. Scattered moderate to isolated strong convection
is elsewhere from 18N-26N between 74W-82W. Please read the latest
NHC Intermediate Public Advisory under AWIPS/WMO headers
MIATCPAT1/WTNT31 KNHC and, the Forecast/ Advisory under AWIPS/WMO
headers MIATCMAT1/WTNT21 KNHC for more details.

At 09/0600 UTC, the center of Hurricane Jose is near 17.2N 59.6W,
or about 208 nm ESE of the Northern Leeward Islands. Jose is
moving WNW, or 290 degrees, at 12 knots. The estimated minimum
central pressure is 940 mb. The maximum sustained wind speeds are
130 kt with gusts to 160 kt. Numerous strong convection is noted
within 60 nm of the center of Jose. Scattered moderate convection
is elsewhere from 16N-20N between 55W-61W. Please read the latest
NHC Intermediate Public Advisory under AWIPS/WMO headers
MIATCPAT2/WTNT32 KNHC and, the Forecast/Advisory under AWIPS/WMO
headers MIATCMAT2/WTNT22 KNHC for more details.

At 09/0600 UTC, the center of Tropical Storm Katia is near 20.3N
97.4W, or about 117 nm SSE of Tampico Mexico. Katia is moving SW,
or 220 degrees, at 6 knots. The estimated minimum central pressure
is 998 mb. The maximum sustained wind speeds are 40 kt with gusts
to 50 kt. Katia is making landfall N of Tecolutla Mexico.
Isolated moderate convection is within 90 nm of the center. Please
read the latest NHC Intermediate Public Advisory issued under
AWIPS/WMO headers MIATCPAT3/WTNT33 KNHC and Forecast/Advisories
issued under AWIPS/WMO headers MIATCMAT3/WTNT23 KNHC for more
details.

...TROPICAL WAVES...

A tropical wave extends from 16N42W to a 1011 mb low near 09N46W
to 05N47W, moving west at 20 knots. This wave coincides with
moderate troughing in 700 mb wind fields. SSMI TPW satellite
imagery indicates the wave is embedded in an area of deep layer
moisture. Widely scattered moderate convection is from 12N-15N
between 42W-46W, and from 07N-11N between 47W-50W.

...ITCZ/MONSOON TROUGH...

The monsoon trough extends from the W coast of Africa near 12N16W
to 10N30W to 09N40W to 08N49W. The ITCZ continues from 08N49W to
09N54W. Aside from the convection associated with the Atlantic
tropical wave, Numerous strong convection is along the coast of W
Africa from 07N-13N between 14W-17W. Scattered moderate convection
is from 05N-10N between 20W-22W.

...DISCUSSION...

...THE GULF OF MEXICO...

T.S. Katia is making landfall S of Tampico Mexico. Please refer
to the special features section above. Moreover, the first outer
feeder bands of Hurricane Irma are over S Florida and the Straits
of Florida. Please consult the special features section for more
information on Irma. Elsewhere, isolated moderate convection is
off the coast of S Texas from 24N-26N between 92W- 97W. 10-15 kt
NE surface flow is over the remainder of the Gulf of Mexico.

...THE CARIBBEAN SEA...

Hurricane Irma is just north of Cuba moving W. Scattered moderate
to strong convection are over central Cuba and the waters south
of Cuba to 18N to include Jamaica. Elsewhere, Hurricane Jose is
approaching the northern Leeward Islands. The outer feeder bands
are now W of 60W. Outside of the influence of Irma, a light to
moderate wind regime will prevail over most of the Caribbean as
the pressure gradient to the south of Irma and Jose remains weak.
Seas are generally in the 4-5 ft range over the eastern Caribbean,
and 1-3 ft over the western Caribbean.

...HISPANIOLA...

Convection from Hurricane Irma is now W of the island. Conditions
will improve slowly during the next couple of days as ridging
between Irma and Jose builds over the island. Isolated
thunderstorms can still be expected over the higher terrain of the
island during daytime heating as the atmosphere will remain moist
enough to support deep convection.

...THE ATLANTIC OCEAN...

Please see the special features section above for information
concerning Hurricanes Irma and Jose. Besides Hurricanes Irma and
Jose, gentle to moderate winds and seas in the 5-7 ft range
prevail. Seas over the southwest north Atlantic waters are in the
9-13 foot range as a result of swell generated by Hurricane Irma.
Otherwise, a 1033 mb Azores high is centered near 43N34W with
ridging extending to the W Atlantic. Moderate to fresh trades are
evident in satellite derived wind data between the monsoon
trough/ITCZ and 25N between 20W and 50W.

For additional information please visit
http://www.hurricanes.gov/marine

$$
Formosa
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