| HOME | ARCHIVES | FORECASTS | IMAGERY | ABOUT NHC | RECONNAISSANCE |

Eastern North Pacific Tropical Weather Discussion (Text)



234 
AXPZ20 KNHC 210404
TWDEP 

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
222 UTC Sat Jul 21 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 0000 UTC surface analysis and satellite imagery through
0600 UTC. 

...TROPICAL WAVES...

A tropical wave is analyzed from 09N81W to 22N80W. The wave is 
collocated with a trough in the 700 mb tropical trough
diagnostics as well as a maximum in total precipitable water. 
Scattered moderate and isolated strong convection is noted N of 
05N and E of 87W.

A tropical wave is analyzed from 06N109W to 17N109W. The wave is
collocated with weak troughing in the 700 mb trough as well as a
maximum in total precipitable water. Scattered moderate and 
isolated strong convection is present from 06N to 15N between 
105W and 115W.

A tropical wave is analyzed from 05N118W to 16N118W. The wave is
weak, but can be tracked via the 700 mb tropical trough 
diagnostics. Scattered moderate and isolated strong convection 
is seen from 07N to 11N between 115W and 122W.

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

The monsoon trough extends from 10N73W to 08N80W to 10N94W to 
09N103W to 10N110W to 09N115W to 12N124W to low pres 1008 MB
centered near 13N132W to 14N135W. Scattered moderate and 
isolated strong convection is noted from 09N to 14N between 98W
and 105W. Low pressure measuring 1008 mb is embedded in the
monsoon trough near 13N132W. Scattered moderate and isolated 
strong convection is present from 10N to 14N between 130W and 
136W.

...DISCUSSION...

OFFSHORE WATERS WITHIN 250 NM OF MEXICO...

A surface ridge extends SE from 32N138W to the Revillagigedo 
Islands. The ridge is maintaining light to moderate NW winds 
across the Mexican offshore waters. Little change is expected
during the next several days. A long-period SW cross-equatorial 
swell is moving into the region today. The extensive swell event
will cause seas to build to between 8 and 9 ft in open waters of
all the forecast zones through early next week. 

In the Gulf of Tehuantepec, pulses of strong northerly gap winds 
will occur during late night and morning hours through Mon 
morning before fading on Tue. Wind waves from these northerly 
winds will interact with the SW swell event to produce mixed seas
south of the Gulf up to 9 ft by Mon before fading on Tue.

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

Gulf of Papagayo: Fresh to strong easterly winds during late 
night and morning hours are expected into early next week. Seas 
from these easterly winds will interact with the SW swell event 
to produce mixed seas southwest of the Gulf up to 10 ft by Mon 
before fading on Tue.  

Easterly winds of only fresh breeze or weaker are forecast 
elsewhere N of the monsoon trough which will meander west of 
Central America between 07N and 10N. Southerly winds of only 
fresh breeze or weaker are expected S of the trough axis the 
next few days.

A long-period southwesterly cross-equatorial swell is moving 
into the region today, allowing seas to build to 9 ft in open 
waters through early next week. An altimeter pass at 1800 UTC 
along 90W showed peak seas of 8 to 9 ft near the equator. 

REMAINDER OF THE AREA...   

A surface ridge is in place from 32N138W to the Revillagigedo 
Islands is maintaining moderate trade winds N of the monsoon
trough, S of 18N and W of 115W. Little change in this pattern is
expected for the next several days.

See discussion above regarding the tropical wave near 108W.

Large long period SW swell is moving across the equator between 
90W and 130W, and will continue to propagate N, affecting most 
of the area east of 130W before fading on Tue. Satellite-derived
sea height data showed seas as high as 9 ft crossing the 
equator near 100W. 

$$
CAM


Standard version of this page

Alternate Formats
About Alternates - E-Mail Advisories - RSS Feeds

Cyclone Forecasts
Latest Advisory - Past Advisories - About Advisories

Marine Forecasts
Latest Products - About Marine Products

Tools & Data
Satellite Imagery - US Weather Radar - Aircraft Recon - Local Data Archive - Forecast Verification - Deadliest/Costliest/Most Intense

Learn About Hurricanes
Storm Names Wind Scale - Prepare - Climatology - NHC Glossary - NHC Acronyms - Frequently Asked Questions - AOML Hurricane-Research Division

About Us
About NHC - Mission/Vision - Other NCEP Centers - NHC Staff - Visitor Information - NHC Library

Contact Us


NOAA/ National Weather Service
National Centers for Environmental Prediction
National Hurricane Center
11691 SW 17th Street
Miami, Florida, 33165-2149 USA
nhcwebmaster@noaa.gov
Disclaimer
Privacy Policy
Credits
About Us
Glossary
Career Opportunities
Page last modified: Saturday, 21-Jul-2018 04:04:52 UTC