Tropical Weather Discussion

axnt20 knhc 231139

Tropical weather discussion
NWS National Hurricane Center Miami FL
739 am EDT Sat Jun 23 2018

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 
1115 UTC.

...Tropical waves...

The axis of a tropical wave is near the West Coast of Africa along
16w from 04n-18n. Scattered moderate convection associated to 
this wave is noted from 06n-10n between 14w and 20w.

The axis of a tropical wave extends from 18n40w to 03n41w.  
Isolated moderate convection is noted at the base of this wave. 

The axis of a tropical wave is near 57w from 04n to 18n, moving W
at 20 kt. Scattered moderate convection is noted from 07n-09n 
between 54w and 59w. 

The axis of a tropical wave is near 70w from the coast of 
western Venezuela to eastern Hispaniola, moving W at 10-15 knots.
This wave, in conjunction with an upper level trough, is helping 
for active convection over the northeastern Caribbean east of the 
wave axis. This convective activity is affecting Puerto Rico and
parts of Hispaniola.

The axis of a tropical wave is near 85w extending from the eastern
North Pacific across western Panama to western Cuba. The wave is 
helping for enhanced convection over the NW Caribbean west of 78w,
and the western half of Cuba. Clusters of moderate to strong
convection are seen where the wave meets the monsoon trough.

...Monsoon trough/ITCZ...

the monsoon trough extends off western Africa near 16n16w to 
12n23w to 06n28w. The ITCZ continues from 06n28w to 05n40w to the
coast of NE Brazil near 0351w. Outside of the convection 
associated with the tropical waves, a cluster of moderate
convection is noted from 04n-07n between 21w-25w. Similar
convection is from 07n to 09n between 44w and 54w.


Gulf of Mexico...

A weak ridge dominates the Gulf waters, producing gentle to 
moderate winds with seas of 3-5 ft over the western Gulf, and 
seas of 3 ft or less across the eastern Gulf. Weak ridging from 
the southeast Gulf to Texas will drift into the northern Gulf 
early next week. Se return flow will increase over the western 
Gulf between the ridge and weak low pressure over northern Mexico 
starting tonight. A trough moving west off the western coast of 
the Yucatan Peninsula each night will further enhance overnight 
winds in the southwest Gulf. 

Caribbean Sea...

A tropical wave is moving across the western Caribbean. Another 
tropical wave is over the central Caribbean. Please, see tropical
waves section for more details. Expect increasing showers and 
isolated thunderstorms in association with the passage of these 
tropical waves.

Trade winds over the south central Caribbean will strengthen and 
expand in areal coverage across the basin through early next week 
as high pressure builds across the central Atlantic. Winds could reach
near gale force along the coast of Colombia tonight. 

Atlantic Ocean...

High pressure of 1028 mb centered near 31n45w extends a ridge 
westward across the forecast area. Fresh trades are noted along 
the southern periphery of the ridge. This high pressure will 
slowly shift westward through tonight, then remain nearly 
stationary near 30n55w through Tue night. The tightening pressure 
gradient over the central Atlantic will support fresh to strong 
trade winds and seas of 8-9 ft E of the Lesser Antilles to about 
45w by early this morning. These marine conditions will persist on
sun with seas building up to 10 ft. Fresh to strong winds are 
also expected off Hispaniola at night.

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