Atlantic Tropical Weather Discussion (Text)

AXNT20 KNHC 191120

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
719 AM EDT Tue Sep 19 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 
0945 UTC.


At 19/0900 UTC, Category 5 Hurricane Maria is located near 16.0N
62.3W or about 45 nm WSW of Guadeloupe and 165 nm SE of St. 
Croix, moving WNW at 8 kt. The estimated minimum central pressure 
is 934 mb. Maximum sustained winds are 135 kt with gusts to 165 
kt. Numerous strong convection and tstms are within 120 nm of the
center in all quadrants and from 09N to 16N between 57W and 63W. 
Scattered moderate convection is elsewhere from 12N to 19N between
57W and 66W. The eye of Maria will move over the northeastern 
Caribbean Sea today, and approach the Virgin Islands and Puerto 
Rico tonight and Wednesday. Please see the latest NHC 
Forecast/Advisory under AWIPS/WMO headers MIATCMAT5/WTNT35 KNHC 
for more details.

At 19/0900 UTC, Hurricane Jose is located about 210 nm ENE of 
Cape Hatteras, North Carolina near 36.0N 71.3W, moving N at 8 kt.
The estimated minimum central pressure is 971 mb. Maximum 
sustained winds are 65 kt with gusts to 80 kt. Scattered moderate 
convection is from 36N to 39N between 68W and 73W. Isolated 
moderate convection is elsewhere from 30N to 40N between 62W and 
76W. The center of Jose is forecast to pass well offshore of the
Delmarva peninsula later today, pass well to the east of the New 
Jersey coast on Wednesday, and pass offshore of southeastern 
Massachusetts by Thursday. Please see the latest NHC 
Forecast/Advisory under AWIPS/WMO headers MIATCMAT2/WTNT22 KNHC 
for more details.


A tropical wave came off the W coast of Africa earlier this
morning. Its axis extends from 19N16W to 07N17W. The wave is in a
region of low vertical wind shear, and abundant low to middle 
level moisture as shown by CIRA LPW and TPW imagery. Upper level
diffluent flow supports scattered moderate convection from 06N to
13N between 14W and 22W.

A tropical wave is over the western Caribbean with axis extending
from 21N79W to 08N83W, moving west at about 15 kt. The wave is in
a region of moderate vertical wind shear and CIRA LPW imagery at 
the lower levels show large patches of dry air in the northern 
wave environment. Moderate shallow moisture and diffluent flow 
aloft support scattered heavy showers and tstms S of 18N between
78W and 84W.


The monsoon trough extends southwest from the African coast near 
13N17W to 07N30W to 08N38W. The ITCZ extends from 08N38W and
continues along 08N45W to 08N53W. Aside from the convection 
associated with the tropical wave, scattered moderate convection 
is within 150 nm either side of the monsoon trough and ITCZ.



Weak surface ridging prevails over the Gulf of Mexico basin with
light and variable winds over most of the basin with the
exception of moderate to locally fresh SE winds within 60 nm of 
the coast of Texas and moderate to fresh NE winds over the Bay of
Campeche. Enhanced winds off the W Yucatan Peninsula are 
associated with the northern region of a tropical wave moving over
EPAC waters. Ridging aloft over the entire Gulf along with dry 
air subsidence continue to support clear skies, except for 
scattered showers over the Bay of Campeche associated with the 
tropical wave. Surface high pressure will dominate across the 
basin through Wednesday.


Major Hurricane Maria is moving across the Leeward Islands and NE
Caribbean waters. The eye of Maria will continue to move over the
northeastern Caribbean Sea today, and approach the Virgin Islands
and Puerto Rico tonight and Wednesday. Please see special 
features for further details. The remaining weather in the basin 
is associated with a tropical wave moving across the W Caribbean 
waters. See the tropical waves section for more information. 
Otherwise, a relaxed pressure gradient due to Hurricanes Maria and
Jose allow for light to gentle trades W of 67W. Expect for the 
tropical wave to continue moving west with convection.


Isolated showers are in the Windward Passage and southern Haiti
adjacent waters. Mostly fair weather prevails across the island.
Weather conditions will deteriorate across the Island starting Wed
morning associated with the outer rainbands of Hurricane Maria
moving across Puerto Rico. These showers will increase as the
system moves WNW very close of the Island on Thu.


Please refer to the Special Features section above for more 
information on Hurricane Maria and Hurricane Jose. The remnants 
of T.D. Lee are located near 15N43W and are forecast to move NW
during the next 24 hours. Numerous strong convection and 
scattered tstms are within 150 nm NE quadrant of the low center. 
Scattered moderate convection is elsewhere from 11N to 23N between
37W and 44W. A surface trough is over the central Atlc extending 
from 30N40W to 26N45W. Scattered moderate convection is E of this 
trough N of 23N between 33W and 40W. The remainder of the basin 
remains under the influence of a broad surface ridge centered 
north of the area.

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Page last modified: Tuesday, 19-Sep-2017 11:21:44 UTC