[Tropical] Tropical Weather Discussion

[EMWIN Server]

AXNT20 KNHC 091157
TWDAT

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
757 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 0600 UTC surface analysis and satellite imagery through
1015 UTC.

...SPECIAL FEATURES...

At 09/1200 UTC, the center of Hurricane Irma is near 22.6N 79.6W,
moving WNW, or 275 degrees, at 10 knots. The estimated minimum
central pressure is 937 mb. The maximum sustained wind speeds are
110 kt with gusts to 135 kt. Numerous strong convection is noted
within 60 nm of the center of Irma. Scattered moderate to isolated
strong convection is elsewhere from 17N-27N between 74W-83W.
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 09/1200 UTC, the center of Hurricane Jose is near 17.8N 60.7W,
moving NW, or 305 degrees, at 11 knots. The estimated minimum
central pressure is 944 mb. The maximum sustained wind speeds are
125 kt with gusts to 150 kt. Numerous strong convection is noted
within 45 nm of the center of Jose. Scattered moderate convection
is elsewhere from 16N-21N between 56W-63W. 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 09/1200 UTC, the center of Tropical Depression Katia is near
20.1N 97.7W, moving WSW, or 255 degrees, at 2 knots. The
estimated minimum central pressure is 1004 mb. The maximum
sustained wind speeds are 25 kt with gusts to 30 kt. Isolated
moderate convection is within 45 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 15N44W to 10N49W to 05N49W, 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-14N between 40W-47W, and from
07N-09N between 49W-51W.

...ITCZ/MONSOON TROUGH...

The monsoon trough extends from the W coast of Africa near 12N16W
to 10N20W to 11N30W to 10N40W to 08N48W. The ITCZ continues from
08N51W to 11N57W. Aside from the convection associated with the
Atlantic tropical wave, Numerous strong convection is along the
coast of W Africa from 09N-13N between 16W-19W. Scattered
moderate convection is elsewhere from 06N-14N between 15W-24W.

...DISCUSSION...

...THE GULF OF MEXICO...

T.S. Katia has stalled at the foot of the Sierra Madre Mountains,
Mexico. Please refer to the special features section above.
Moreover, the 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,
scattered moderate convection is off the coast of NE Mexico from
24N-26N between 95W-98W. 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
have reached of 63W. 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 continues over W Haiti. 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
T.S.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 1031 mb Azores high is centered near 43N32W 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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