Atlantic Tropical Discussion

Active Tropical Systems Basin Outlooks Satellite
Atlantic Basin Tropical Discussion
 
153 
AXNT20 KNHC 281742
TWDAT 

Tropical Weather Discussion 
NWS National Hurricane Center Miami FL 
205 PM EDT THU JUL 28 2016

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 1200 UTC surface analysis and satellite imagery through
1715 UTC.

...TROPICAL WAVES...

Tropical wave in the far east Tropical Atlantic extends along
19W/20W from 8N-17N with a 1011 mb low along the wave near
10N20W. Wave and low are moving west 10 to 15 kt over the past
24 hours. Wave coincides with a 700 mb trough as depicted in the
global models and is embedded within broad area of moisture as
seen on the SSMI Total Precipitable Water imagery. Clusters of
scattered moderate to isolated strong convection are from 9N-13N
between 20W-23W. 

Tropical wave in the east Tropical Atlantic west of the Capo
Verde Islands extends along 34W from 10N-17N moving west near 15
kt over the past 24 hours. Wave coincides with a 700 mb trough
south of 16N as depicted in the global models and is embedded
within a high amplitude surge of moisture as seen on the SSMI
Total Precipitable Water imagery. Scattered moderate convection
is within a 60 nm radius of 14N36W. 

Tropical wave in the west Tropical Atlantic extends along
47W/48W from 10N-16N moving west 10 to 15 kt over the past 24
hours. Wave coincides with a weak 700 mb trough south of 16N as
depicted in the global models and is embedded within a weak
surge of moisture north of 12N as seen on the SSMI Total
Precipitable Water imagery. No associated deep convection or
shower activity.

Tropical wave in the west Caribbean extends along 82W/83W from
12N-22N moving west near 20 kt over the past 24 hours. Wave
coincides with a well defined 700 mb trough as depicted in the
global models and is embedded within a surge of moisture north
of 16N as seen on the SSMI Total Precipitable Water imagery. No
associated deep convection. Scattered showers and isolated
thunderstorms are from 15N-21N between 80W-85W. 

...ITCZ/MONSOON TROUGH...

The monsoon trough extends across Africa into the east Tropical
Atlantic near 19N16W and continues along 15N18W 13N24W 11N36W to
9N47W where the ITCZ begins and continues along 8N51W to South
America near 8N60W. Clusters of isolated moderate convection are
from 7N-13N between 27W-38W. 

...DISCUSSION...

GULF OF MEXICO...

An inverted upper trough dominates most of the Gulf of Mexico
this afternoon extending from south Mexico near 18N93W to over
the north Gulf coast near Vermilion Bay, Louisiana. A pair of
surface troughs are in the Gulf. One extends from 28N87W to
24N89W with scattered showers and isolated thunderstorms from
24N-28N between 86W-92W. A second surface trough is over the
southwest Gulf from 23N92W to over Mexico near 18N94W with
scattered showers and isolated thunderstorms south of 25N west
of 95W to inland over Mexico. An upper ridge anchored in the
west Atlantic extends over the east Gulf east of 87W. A surface
ridge extends from the west Atlantic across central Florida to a
1018 mb high near 29N86W continuing to the Louisiana/Texas
border. The surface ridge will persist through the weekend. A
thermal trough will move off the west coast of the Yucatan
peninsula each evening through the weekend.

CARIBBEAN SEA... 

An upper ridge is anchored along the coast of Nicaragua near
13N83W covering the Caribbean west of 77W. The activity
associated with the tropical wave is being enhanced by this
upper ridge. An upper trough over the southwest Atlantic extends
south over the east Caribbean east of 77W. The upper trough is
embedded within dry stable air and strong subsidence, therefore
is not producing any convection or shower activity. This is
leaving the remainder of the Caribbean under mostly clear skies
this afternoon. The tight pressure gradient between the west
Atlantic surface ridge and the lower pressure over South America
is producing fresh to strong trade winds across the central
Caribbean through early Saturday. Winds will decrease slightly
on Saturday and Sunday as the surface ridge over the west
Atlantic weakens. The tropical wave will move over Central
America tonight and Saturday. The next tropical wave will enter
the east Caribbean Saturday.  

...HISPANIOLA... 

Isolated showers and thunderstorms are developing across the
Dominican Republic this afternoon leaving Haiti under clear
skies. The upper low over the southwest Atlantic will shift
westward to over the island Friday then northwest of the island
on Saturday. Isolated afternoon/evening showers and
thunderstorms will be possible through Saturday. Moisture will
increase late in the weekend.

ATLANTIC OCEAN... 

An upper ridge anchored near 31N62W dominates the west Atlantic
and extends south over the Cuba. An upper low over the southwest
Atlantic near 22N62W extends an upper trough southwest over the
east Caribbean. The upper ridge to the northwest of the upper
low is providing difflunce aloft to generate scattered to
numerous showers and isolated thunderstorms from 23N-29N between
65W-73W. A surface ridge extends from a 1020 mb high near 27N75W
across Florida into the Gulf of Mexico. Remnant moisture is
generating isolated showers and possible thunderstorms from 27N-
31N between 58W-60W. A surface ridge dominates the east Atlantic
anchored by a 1032 mb high north of the Azores. West Atlantic
surface ridge will persist through Saturday when it begin to
weaken through Sunday.   

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

$$
PAW