872 
AXPZ20 KNHC 060911
TWDEP 

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
1005 UTC Thu Sep 6 2018

Tropical Weather Discussion for the eastern Pacific Ocean from
the Equator to 32N, east of 140W. The following information is
based on satellite imagery, weather observations, radar, and
meteorological analysis.

Based on 0600 UTC surface analysis and satellite imagery through 
0900 UTC. 

...SPECIAL FEATURES...

Hurricane Olivia centered near 18.1N 125.8W at 0900 UTC, moving 
WNW at 12 kt. Estimated minimum central pressure is 970 mb. 
Maximum sustained winds are 90 kt with gusts to 110 kt. Numerous 
moderate to strong convection is within 60 nm of the center. 
Scattered moderate isolated strong convection is noted elsewhere 
within 120 nm of the center. Olivia is forecast to continue on a 
west-northwest track, while gradually weakening. See latest NHC 
forecast/advisory under AWIPS/WMO headers MIATCMEP2/WTPZ22 KNHC 
for more details.

...TROPICAL WAVES...

The axis of a tropical wave is near 89W N of 05N. Convection is 
described below in monsoon trough section. 

The axis of a tropical wave is from 06N to 18N along 106W, with 
a 1009 mb low pressure area analyzed near 14N106W. Scattered 
moderate convection is noted from 12N to 16N between 106W and 
111W. 

...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... 

The monsoon trough extends from 09N84W to 11N89W to low pressure 
near 14N106W to 10N115W, then resumes from 14N126W to 13N140W. 
Scattered moderate to strong convection is noted from 12N to 16N 
between 91W and 98W. Scattered moderate convection is noted from 
04N to 07N between 83W and 90W, and within 75 nm either side of 
a line from 17N120W to 11N130W.

...DISCUSSION...

OFFSHORE WATERS WITHIN 250 NM OF MEXICO... 

A surface trough will meander between the the Gulf of California 
and the Baja California Peninsula the next few days. A ridge is 
forecast to build across the region later today as Olivia moves 
further away from the offshore forecast waters. SW swell will 
build seas to 7 to 8 ft over the offshore waters of southern 
Mexico by Sat. 

OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, AND 
WITHIN 750 NM OF ECUADOR...

The monsoon trough will linger near 10N during the next few 
days. Winds on both sides of the trough axis will be gentle to 
moderate, and seas will build across the region as long period 
SW swell crosses the equator, bringing seas to 8-9 ft by Fri, 
first between Ecuador and Galapagos Islands, and then into the 
pacific waters of Costa Rica and Panama. 

REMAINDER OF THE AREA...   

Please see the Special Features section above for details on 
Hurricane Olivia. 

A ridge dominates the forecast waters N of 20N W of 120W, with 
gentle to moderate winds. Seas generated by Olivia will continue 
to spread across the waters north of 12N and west of 120W over 
the next couple of days. 
  
$$
Mundell