AXNT20 KNHC 182357
Tropical Weather Discussion
NWS National Hurricane Center Miami FL
657 PM EST Sun Nov 18 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 1800 UTC surface analysis and satellite imagery through
The monsoon trough passes through coastal sections of Sierra
Leone near 09N13W to 05N16W. The ITCZ continues from that point
to 04N37W to 03N50W. Scattered moderate convection is within 220
nm north and 180 nm south of the boundary between the west coast
of Africa to 30W. Between 30W-50W, scattered showers are along and
in the vicinity of the boundary with scattered to broken cloud
cover associated with the convection.
GULF OF MEXICO...
Middle level to upper level SW wind flow spans the entire area.
A surface trough is over the SW the Gulf of Mexico parallel to
the coast of Mexico from 26N97W to 20N97W. Scattered showers are
occurring over the western Gulf of Mexico, mainly west of 90W.
This includes areas within 90 nm along the coast of Texas.
A 1016 mb surface low is centered near 24N83W. A surface trough
passes from 27N85W to the low and into the NW Caribbean near
Moderate to fresh SE flow will set up across the western Gulf
today ahead of a cold front forecast to reach the coast of Texas
tonight. This front will stall from SE Louisiana to Tampico,
Mexico by Mon night. Then, a reinforcing cold front will move off
the Texas coast early Tue, merging with the stationary front, then
reaching from the Florida panhandle to Veracruz, Mexico Tue
night. The western portion will stall Tue night and then drift
northwest through midweek. The eastern portion will continue SE,
reaching from S Florida to the central Gulf by late Wed.
A 1015 mb low centered just north of western Cuba near 24N83W
extends a trough to 20N82W. Scattered showers and thunderstorms
are near the Isle of Youth, generally between 82W-84W. Another
surface trough extends from 17N83W to southern Belize. Scattered
moderate convection is seen from 17N-20N between 82W-87W.
The SW end of a stationary front goes through the SE Bahamas and
ends over eastern Cuba. Isolated showers are seen in the area
between Jamaica and eastern Cuba as well as in the Windward
The monsoon trough near Panama is bringing scattered moderate
convection to the far SW Caribbean south of 10N between 75W-82W,
and over Colombia and Panama.
Convergence along this trough will continue to support scattered
showers and tstms through Mon night. Strong high pressure building
N of the area is supporting fresh to strong winds along the coast
of Colombia. These winds and associated seas will prevail through
early Tue as the center of high pressure shifts eastward across
the NW Atlc waters. Large swell over the Atlantic Ocean will
continue to impact the waters E of the Lesser Antilles through Tue
A stationary front enters the forecast area near 30N63W and
continues to a 1016 mb low near 30N65W. The stationary front
continues to a 1015 mb low near 27N70W, and continues to the SE
Bahamas near 22N73W to eastern Cuba near 21N76W. Scattered
showers and thunderstorms are seen within 90 nm of a line from
28N. Scattered moderate convection is also noted from 28N-32N
between 57W-66W. Isolated showers and thunderstorms are possible
elsewhere along the front.
A second cold front passes through the west coast of the country
of Western Sahara near 21N17W to 20N20W and transitions to a
dissipating front from that point to 20N24W. A surface trough
continues from that point westward to 19N43W. Scattered moderate
convection is located north of 23N and east of 24W, and this
activity is moving SE toward the country of Western Sahara. Long
period NW swell in excess of 15 ft are affecting the entire NE
Atlantic north of 18N and east of 35W, including the Madeira and
Relatively quiet weather is over the central subtropical Atlantic
due to a 1023 mb surface high near 27N46W.
Fresh to strong winds and associated seas will continue mainly
within 120 nm NW of the stationary front through early this
evening. The front will remain nearly stationary through Mon
night. Then, a reinforcing cold front will reach the north waters
Tue and merge with the stationary front.
For additional information
please visit http://www.hurricanes.gov/marine