860 
AXPZ20 KNHC 290925
TWDEP 

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
1005 UTC Wed Aug 29 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...

Tropical Storm Miriam centered near 14.2N 138.4W at 0900 UTC, 
moving W at 11 kt. Estimated minimum central pressure is 999 mb. 
Maximum sustained winds are 55 kt with gusts to 65 kt. Numerous 
moderate to strong convection within 180 nm SE and 75 nm NW of 
the center. Some further strengthening is possible during the 
next 24 to 48 hours. Miriam is forecast to move into the Central 
Pacific basin in 24 hours then turn northward. See latest NHC 
forecast/advisory under AWIPS/WMO headers MIATCPEP5/WTPZ35 KNHC 
for more details.

Tropical Storm Norman centered near 17.5N 114.6W at 0900 UTC or 
450 nm SW of the southern tip of Baja California, moving W at 9 
kt. Estimated minimum central pressure is 999 mb. Maximum 
sustained winds are 50 kt with gusts to 60 kt. Numerous moderate 
and scattered strong convection is within 120 nm of the center. 
Norman is forecast to strengthen to a hurricane within the next 
12 to 24 hours. See latest NHC forecast/advisory under AWIPS/WMO 
headers MIATCPEP1/WTPZ31 KNHC for more details.

...TROPICAL WAVES...

A tropical wave axis N of 03N along 86W, moving W at 15 kt. 
Scattered moderate and isolated strong convection is from 05N to 
10N between 83W and 86W.

A tropical wave axis is from 05N to 17N along 105W moving W at 
10 kt. Scattered moderate and isolated strong convection is from 
08N to 16N between 100W and 108W.
   
...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... 

The monsoon trough axis extends from 09N84W to 11N101W to 
16N110W, then resumes SW of Norman from 14N117W to 12N133W. 
Outside of convection associated with tropical waves mentioned 
above, scattered moderate and isolated strong convection is 
within 45 nm either side of the axis between 117W and 123W.

...DISCUSSION...

OFFSHORE WATERS WITHIN 250 NM OF MEXICO... 

A ridge extends from north of 30N to the Revillagigedo Islands. 
The pressure gradient between the high and a trough across the 
Baja California Peninsula will support moderate to occasionally 
fresh NW winds along the coast of Baja California Norte through 
Fri, with seas generally 4 to 6 ft. Winds will diminish on Sat 
as the pressure gradient weakens.

Low pressure over northern Mexico will support light to gentle 
southerly flow over the Gulf of California the entire week.

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

The monsoon trough will linger along 09N/10N during the next few
days. Winds on both sides of the trough axis will generally be 
light to moderate. The exception to this will be brief periods 
in the Gulf of Papagayo where nocturnal offshore gap winds will 
pulse to moderate to fresh. 

REMAINDER OF THE AREA...   

Please see the Special Features section for information on
Tropical Storm Miriam and Tropical Storm Norman.

Elsewhere, the pressure gradient between ridging across the 
waters N of 20N and the monsoon trough will support moderate to 
locally fresh trades and 4 to 7 ft seas in mixed swell N of the 
monsoon trough and west of 120W through the week.
  
$$
Mundell