Atlantic Tropical Weather Discussion (Text)

AXNT20 KNHC 281033

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
633 AM EDT Wed Jun 28 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 
1030 UTC.


A tropical wave has its axis just off the coast of Africa along 
19W from 12N to 20N, moving westward at around 10 kt. Low-level 
moisture is limited within this wave, therefore, no convection is 
associated with this feature at this time.

A tropical wave has its axis from 11N36W to 02N37W, moving 
westward at 10-15 kt. Satellite imagery and TPW data reveals that
the wave remains embedded within a very moist environment, except
for over its eastern region where Saharan dry air and dust is 
present. Isolated moderate convection is noted north of 06N 
between 34W-40W.

A broad tropical wave has its axis tilted from 15N56W to 05N61W, 
moving westward 15-20 kt. This wave continues to be easily 
identifiable on satellite imagery as having the typical 
configuration of waves observed later during the season. It is 
detected in the model fields, and is further supported by the 
latest diagnostic model analysis. Scattered moderate convection is
observed from 11N-16N between 54W-65W. The wave is forecast to 
continue moving west affecting the eastern and central Caribbean 
waters through Thursday.

A tropical wave is moving across the western Caribbean with its 
axis along 82W from 08N to 21N, moving westward at 10-15 kt. This
wave is also evident in satellite imagery, and continues to mark 
the leading surge of very deep atmospheric moisture, as seen in 
TPW data. Isolated moderate convection is observed in the vicinity
of this wave between 80W-84W. The wave will move across the 
remainder of the western Caribbean Sea through today, and inland 
Central America by tonight.


The Monsoon Trough extends from the coast of Africa near 20N16W, 
and continues southwest to 10N30W. The Intertropical Convergence 
Zone then extends from 06N39W to 09N56W. Isolated moderate 
convection is within 100 nm on either side of the ITCZ axis. 



A mid to upper-level trough axis is over the far northwest Gulf, 
while a surface trough is along the Texas coast. The combination 
of these features along with the presence of diffluent flow aloft 
east of the mid-upper level trough continues to support isolated 
showers and thunderstorms mainly north of 24N and west of 90W. A 
stationary front is analyzed from northeast Florida to near Cross
City, Florida and to 29N86W where it becomes diffuse from there 
to 29N88W. The shower and thunderstorm activity over the western 
Gulf is forecast to remain active through today, then shift 
northeast by tonight and Thursday as the mid/upper level trough 
slides eastward. The stationary frontal boundary is forecast to 
gradually become diffuse through the morning hours, with the 
remnants lifting back to the north through tonight. 


The main feature presently in the basin is a tropical wave 
currently over the western Caribbean, and the near-future arrival
of another tropical wave which is approaching the Lesser Antilles
at this time. These features are discussed in the section above. 
Aside from the convection related to the tropical waves, fair
weather prevails elsewhere. Scatterometer data depicts moderate to
fresh trades across the basin. The pressure gradient is forecast 
to tighten over portions of the far south-central Caribbean 
beginning tonight and continuing through Thursday night inducing 
strong to near-gale force east winds over this area, with the 
near-gale force winds expected across and near the Gulf of 


Fair weather prevails across the island at this time. Little 
change is expected in the present weather pattern through the next
24 hours. Convection is expected once again by the end of the week
as a tropical wave approaches. 


Three tropical waves are moving across the tropical Atlantic.
Refer to the section above for details. A broad mid to upper-level
trough extends southwestward from along the eastern seaboard to 
the far northwest portion of the basin. It supports a stationary 
front that extends through 33N74W to 30N81W. Scattered showers 
and thunderstorms are noted north of the Bahamas and west of about
75W. This activity will continue through much of today and 
tonight as the surface boundary weakens, and the mid to upper 
trough slides eastward while it broadens out further. A surface 
trough extends from 32N56W to 24N57W with isolated showers. This 
trough is a reflection of an upper-level low centered in the same 
area. A broad high pressure prevails across the remainder of the 
basin, anchored by a 1028 mb surface high centered near 36N40W. 

For additional information please visit 



Standard version of this page

Alternate Formats
About Alternates - E-Mail Advisories - RSS Feeds

Cyclone Forecasts
Latest Advisory - Past Advisories - About Advisories

Marine Forecasts
Latest Products - About Marine Products

Tools & Data
Satellite Imagery - US Weather Radar - Aircraft Recon - Local Data Archive - Forecast Verification - Deadliest/Costliest/Most Intense

Learn About Hurricanes
Storm Names Wind Scale - Prepare - Climatology - NHC Glossary - NHC Acronyms - Frequently Asked Questions - AOML Hurricane-Research Division

About Us
About NHC - Mission/Vision - Other NCEP Centers - NHC Staff - Visitor Information - NHC Library

Contact Us

NOAA/ National Weather Service
National Centers for Environmental Prediction
National Hurricane Center
11691 SW 17th Street
Miami, Florida, 33165-2149 USA
Privacy Policy
About Us
Career Opportunities
Page last modified: Wednesday, 28-Jun-2017 10:33:28 UTC