Atlantic Tropical Weather Discussion (Text)

AXNT20 KNHC 241041

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
640 AM EDT Sun Sep 24 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.


Hurricane Maria is centered near 27.9N 72.7W at 24/0900 UTC or 
about 252 nm east-northeast of Great Abaco Island, moving north at
8 kt. Estimated minimum central pressure is 948 mb. Maximum 
sustained wind speed is 95 kt with gusts to 115 kt. Scattered to 
numerous moderate convection is from 26N-31N between 66W-76W. See 
the latest NHC Forecast/Advisory under AWIPS/WMO headers 
MIATCMAT5/WTNT25 KNHC for more details.

Hurricane Lee is centered near 31.8N 50.1W at 24/0900 UTC or 
about 747 nm east of Bermuda, moving south at 1 kt. Estimated 
minimum central pressure 983 mb. Maximum sustained wind speed is 
75 kt with gusts to 90 kt. Scattered moderate convection is from 
30N-34N between 48W-52W. See the latest NHC Forecast/Advisory 
under AWIPS/WMO headers MIATCMAT4/WTNT24 KNHC for more details.


A tropical wave extends its axis from 22N25W to 06N27W, moving 
west at about 10 kt. The wave coincides with a 700 mb low, the 
northern vortex, centered near 15N28W. No significant deep 
convection is associated with the wave axis at this time. The 
ongoing convection is related to the monsoon trough axis and will 
be mentioned in the section below.

A tropical wave extends its axis from 20N58W to 06N60W, moving 
west at 10-15 kt. The wave remains on the southwestern periphery 
of a 700 mb ridge anchored near 21N44W and lies beneath an upper 
level trough axis extending along 53W. Scattered moderate 
convection is observed from 08N-18N between 51W-61W. 


The monsoon trough axis extends from the African coast near 
14N17W to 07N34W. The ITCZ extends from 07N34W to 07N57W. 
Scattered moderate convection prevails along the monsoon trough 
and in the vicinity of the ITCZ near the tropical wave over the 
central Atlantic mainly west of 51W.



A mid to upper-level low is noted on water vapor imagery centered
over southern Alabama near 31N87W with a trough axis extending 
southward over the eastern Gulf to a broad base over the Yucatan 
peninsula and northwest Caribbean. A weak pressure pattern across 
the basin is resulting in gentle to moderate easterly winds with 
areas of isolated showers generally occurring north of 26N and 
east of 88W under the influence of the mid to upper-level lifting
dynamics in place. Elsewhere, dry and stable northerly flow aloft
and gentle to moderate easterly winds are providing for fair 
conditions and mostly clear skies. Through the remainder of the 
weekend into the middle of next week, little change is expected in
overall conditions.


West-southwesterly flow aloft prevails west of 73W as Hurricane 
Maria is well north of the basin and an overall weak pressure 
pattern remains in place across the central and western Caribbean.
As a result of this, winds remain generally light to gentle and 
variable at times. A couple of surface troughs are analyzed in the
basin, one over the Gulf of Honduras, and the other extending 
south of Hispaniola near 18N72W to 14N74W. Scattered moderate 
convection is observed in the vicinity of these troughs. A 
tropical wave currently along 60W will continue approaching the 
Lesser Antilles through the weekend increasing the probability of 
convection across the eastern Caribbean's islands and adjacent 


A surface trough currently extends from the south-central coast 
near 18N72W to 14N74W and continues to provide focus for isolated
showers across the southeastern portion and south coast of the 
island. The troughing will slide westward through the weekend as 
weak ridging builds in from the central Atlantic from the east.


Outside the influence of Maria across the west Atlantic waters, 
surface ridging prevails across much of the remainder of the 
basin. A 1019 mb high is centered near 34N57W, and a 1021 mb high
is centered across the central Atlantic near 28N40W. Between 
these two highs, Tropical Storm Lee continues to influence the 
waters from 30N-33N between 48W-52W. In addition, a mid to upper- 
level trough extends along 52W enhancing isolated convection from
20N- 25N between 50W-55W.

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Page last modified: Sunday, 24-Sep-2017 10:41:40 UTC