Tropical Weather Discussion

axnt20 knhc 161820 cca

Tropical weather discussion...corrected
NWS National Hurricane Center Miami FL
105 PM EST Fri Nov 16 2018

Corrected Atlantic Ocean section

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 
1745 UTC. 

...Monsoon trough/ITCZ...

The monsoon trough axis extends from well over the interior of
Africa to the coast of Sierra Leone near 08n12w and to 05n19w,
where latest scatterometer data indicates that it transitions
to the ITCZ axis, which continues to 03n28w to 03n38w and to 
03n47w. Scattered moderate convection within 300 nm to the north
of the monsoon trough between the coast of Africa and 19w.

Gulf of Mexico...

In the upper levels, a strong jetstream branch originating from
the eastern Pacific extends northeastward across the SW Gulf, to 
the Yucatan Peninsula and to across central Florida. At the
surface, high pressure dominates the weather regime in the wake 
of the recent cold front passage. Cold air advection with the 
northerly flow around a 1025 mb high center located over the 
northwestern Gulf near 27n94.5w is resulting in broken to 
overcast stratocumulus clouds across just about the entire 
sections of the eastern and middle Gulf. Broken to overcast low 
clouds associated with a surface trough are confined to the 
southwestern Gulf. Scattered showers are possible with these 
clouds. Clear skies are present generally to the north of 28n, 
and from 24n to 26n west of 92w. Isolated showers are over some 
parts of The Straits of Florida. A rather tight pressure 
gradient between the high pressure over the area and the 
recently departed cold front, now over the northwestern 
Caribbean Sea, is bringing mainly fresh northerly winds over the 
far southeastern Gulf and Straits of Florida. Gentle to moderate 
winds in anticyclonic fashion around the 1025 mb high are 
elsewhere across the Gulf. Little change is expected in the 
present synoptic pattern through Sat, then the high pressure 
will begin to shift eastward on sun in response to the next cold 
front that will be moving across Texas. This front is forecast 
to reach the Texas coast Sun night.

Caribbean Sea...

The tail end of a cold front extends from central Cuba at 22n78w 
to near the Cayman Islands, where it becomes stationary to the
coast of northeastern Honduras as of 15z. Satellite imagery shows
mainly broken low clouds, with possible scattered showers along 
and to the northwest of the front, with the exception of a pocket 
of multilayer clouds observed to the south of 19n between 83w and 
86w. These clouds contain scattered showers and thunderstorms, 
which are being supported by a upper-level disturbance riding 
along a strong jet stream branch that extends northeastward from 
the eastern Pacific to across the northwestern Caribbean Sea and 
Yucatan Peninsula. The combination of strong northerly winds 
behind the front along with the availability of the low-level 
moisture being channeled from The Straits of Florida to western 
and central Cuba, has induced periods of heavy rain over some 
sections of mainly central Cuba since Thu evening. Periods of 
brief heavy rain along with localized flooding are possible over 
these same areas through the remainder of the afternoon. The 
strong northerly winds are forecast to diminish to fresh winds 
on Sat as the pressure gradient over the southeastern Gulf of 
Mexico and northwestern Caribbean slackens. 

A surface trough, the remnants of a former tropical wave, 
extends from northwest Colombia to just southwest of Jamaica. 
Isolated showers moving quickly westward are seen from 13n to 
19n between 74w and 79w. Scattered showers and isolated 
thunderstorms supported by low- level speed convergence, are 
over the far southwestern Caribbean south of 13n between 78w and 
the coast of Costa Rica. Patches of low-level moisture 
containing isolated showers are moving westward over the 
remainder of the Caribbean to the east of the cold front.

The stationary front will gradually weaken through Sat night. 
High pressure over the central Atlantic will build southward 
through sun bringing an increase to the trades across the eastern
and central Caribbean that is expected to last into early next

Atlantic Ocean...corrected

A cold front, that is well defined in satellite imagery, is over 
the western Atlantic along a position from 32n72w to 25n77w and 
central Cuba as of 15z. Scattered showers and isolated 
thunderstorms are along and within 60 nm east of the front north 
of 27n. Fresh to strong northerly winds are west of the front. 
Broken to overcast stratocumulus clouds, with isolated showers are
noted within 60 to 90 nm west of the front, and scattered 
stratocumulus clouds are elsewhere west of the front. The front is
forecast to become stationary from near 32n66w to the southeast 
Bahamas and eastern Cuba by Sat morning, and slowly weaken through

A surface trough extends from near 27n74w to low pressure of 1012
mb near 24n75w and to just north of eastern Cuba. Scattered 
showers and thunderstorms are within 60 nm northeast and east of
the low. Isolated showers and thunderstorms are elsewhere along 
and near the trough. The low is forecast to dissipate tonight or
Sat along with the trough..

A cold front has dipped into the central Atlantic along a 
position from near 32n30w to 28n40w to 27n50w and dissipated to 
29n57w. Another cold front has traversed the Canary Islands and 
extends from 32n10w to 26n15w. Isolated showers associated with 
this front have mostly moved inland the coast of Morocco. 
Otherwise, high pressure covers the remainder of the Atlantic.
The high pressure over the central Atlantic will surge southward 
through the weekend.

For additional information 
please visit http://www.Hurricanes.Gov/marine



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