Atlantic Tropical Weather Discussion (Text)

AXNT20 KNHC 251045

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
645 AM EDT Mon Sep 25 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 30.6N 73.0W at 25/0900 UTC or 
about 330 nm south-southeast of Cape Hatteras North Carolina, 
moving north at 7 kt. Minimum central pressure is 957 mb. Maximum
sustained winds are 70 kt with gusts to 85 kt. Scattered moderate
convection is within 200 nm of the center mainly over the east
semicircle. See the latest NHC Forecast/Advisory under AWIPS/WMO 
headers MIATCMAT5/WTNT25 KNHC for more details.

Hurricane Lee is centered near 31.1N 49.4W at 25/0900 UTC or 
about 791 nm east of Bermuda. Lee is currently stationary. 
Estimated minimum central pressure is 980 mb. Maximum sustained 
winds are 80 kt with gusts to 100 kt. Scattered moderate 
convection is from 30N-33N between 39W-51W. See the latest NHC 
Forecast/Advisory under AWIPS/WMO headers MIATCMAT4/WTNT24 KNHC 
for more details.


A tropical wave extends its axis from 19N31W to 08N33W, moving 
west at around 10 kt. The wave is supported by 700 mb troughing 
and weak 850 mb vorticity in the vicinity of the wave axis. 
Little convection is associated with the wave axis at this time.

A tropical wave extends its axis from 19N64W to 09N64W, moving 
west at 10-15 kt. The wave is on the southwestern periphery of a 
700 mb ridge and the western periphery of an upper-level trough 
axis extending from 25N54W into the tropics to near 10N51W. 
Scattered moderate convection is north of 16N between 60W-65W. 


The monsoon trough extends from the African coast near 16N16W to 
07N39W. The Intertropical Convergence Zone extends from 07N39W to
08N59W. Scattered moderate convection is from 10N-18N and east of



A mid to upper-level low is noted on water vapor imagery over 
northern Mississippi, extending a trough axis across the eastern 
Gulf to the northern Yucatan peninsula. A weak pressure pattern 
exists across the entire basin, resulting in gentle to moderate 
easterly winds and areas of isolated showers under the influence 
of the mid-level lifting dynamics in place. Little change is 
expected in overall conditions. By Tuesday night into Wednesday, 
easterly flow will increase slightly into moderate to occasional 
fresh conditions as ridging noses in from the lower Mississippi 
River valley region into the eastern Gulf waters.


A tropical wave is approaching eastern Puerto Rico. Refer to the 
section above for details. Southwest flow aloft prevails west of 
70W, and a weak pressure pattern remains in place across the 
central and western Caribbean. A surface trough extends from
18N72W to 10N73W. Scattered moderate convection is observed to 
the west of the wave's axis. Scatterometer data depicts light to 
gentle winds across the western half of the basin while moderate 
to fresh winds prevail east of 75W. A surface trough was analyzed 
from 16N75W to 11N74W and continues to be the focus for scattered 
showers between 70W- 80W.


A surface trough southwest of the island enhanced showers across 
southern portions of the area. The trough will slide further 
westward through the next 24 hours as weak ridging builds in from 
the central Atlantic.


A tropical wave is moving across the basin. Refer to the section
above for details. Outside the influence of Maria in the west 
Atlantic and Lee in the central Atlantic, surface ridging prevails
across much of the remainder of the region. A 1021 mb high is 
centered east-northeast from Bermuda near 35N58W and a 1022 mb 
high is centered across the east Atlantic near 33N23W. 

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Page last modified: Monday, 25-Sep-2017 10:47:03 UTC