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Eastern North Pacific Tropical Weather Discussion

AXPZ20 KNHC 220900

Tropical Weather Discussion  
NWS National Hurricane Center Miami FL
1005 UTC Mon Oct 22 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.      


Hurricane Willa centered near 18.2N 107.1W at 22/0900 UTC moving 
N at 6 kt. Estimated minimum central pressure is 931 mb. Maximum 
sustained wind speed is 135 kt with gusts to 165 kt. Numerous 
strong convection is currently observed within 75 nm of the 
center, surrounded by scattered moderate to strong convection in 
bands within 300 nm of the center. Some of these rain bands will 
bring very heavy rainfall along the Pacific coast of mainland 
Mexico from 103W to 107W through Tue evening as Willa tracks N, 
and later turns NE across the central Mexican offshore waters.
Large swells generated by Willa will continue to reach the 
mainland Mexican coast between 102W and 108W through Tue night, 
and are likely to cause life-threatening surf and rip current 
conditions. Please refer to local forecasts from the 
Meteorological Service of Mexico for specific information on 
heavy rainfall and flash flood potential from Willa. Refer to 
the latest NHC forecast/advisory under AWIPS/WMO headers 
MIATCMEP4/WTPZ24 KNHC for additional details. 

Tropical Storm Vicente centered near 14.1N 99.7W at 22/0900 UTC 
moving W at 9 kt. Estimated minimum central pressure is 1004 mb.
Maximum sustained wind speed is 40 kt with gusts to 50 kt. 
Scattered moderate to strong convection along a band within 180 
nm over the W semicircle of the center. Vicente will continue on 
a general westward track through the southern Mexican offshore 
waters this morning then turn N and gradually weaken through Tue 
dissipating by late Wed. Refer to the latest NHC forecast/ 
advisory under AWIPS/WMO headers MIATCMEP3/WTPZ23 KNHC for 
additional details.   


A tropical wave is analyzed N of 06N along 90W with scattered 
moderate isolated strong convection flaring within 60 nm of 


The monsoon trough extends W off the Caribbean coast of Colombia 
at 10N76W to the Pacific coast of Costa Rica at 09N83W and 
through a tropical wave at 09N90W then turns NW to 12N95W where 
it loses identity in the cyclonic circulation associated with 
Tropical Cyclone Vicente. The monsoon trough resumes SW of 
Hurricane Willa at 13N112W, and continues SW through an embedded 
1008 mb surface low at 11N117W to 09N128W to 11N140W. Scattered 
moderate isolated strong convection is observed within 120 nm 
either side of a line from 05N78W to 09N87W, and within 150 nm 
of 09N94W and 11N110W and 07N132W. 



See the Special Features paragraph for details on Tropical 
Cyclones Vicente and Willa.  

W of the Baja california Peninsula...Gentle to locally moderate 
NW to N flow is expected through this evening when the pressure 
gradient will tighten, supporting moderate to locally fresh 
northerly flow W of the Baja California Peninsula on Tue into 
early Wed as Willa passes to the S. Large southerly swell from 
Tropical Cyclone Willa will propagate N through the waters W of 
Baja beginning this evening, and reaching as far N as 26N early 
Wed, before beginning to subside from the N.

Gulf of California: Light, mostly northerly flow is expected 
through this afternoon when large southerly swell from Tropical 
Cyclone Willa will propagate into the southern gulf waters, and 
then persist through late Tue night. Fresh to locally strong 
northerly winds are also expected across the gulf waters S of 
24.5N on Tue night into Wed as Willa passes S of the gulf 

Gulf of Tehuantepec...Fresh to locally strong northerly flow is 
expected through late this morning.  


Gulf of Papagayo...Pulses of fresh NE flow are forecast through 
this morning.  

Light northerly winds and 4 to 7 ft seas are forecast elsewhere 
N of the monsoon trough, while moderate to locally fresh 
southwesterly monsoonal flow, with 5 to 8 ft seas forecast 
through this afternoon, then mostly moderate SW flow and 4 to 6 
ft seas are forecast through the middle of the week.


Refer to the Special Features paragraph above for details on 
Tropical Cyclone Willa.

A 1008 mb low near 11N117W will drift W for the next several 
days with fresh southerly flow, and 6 to 8 ft seas forecast 
within 300 nm SE of the low. This low has a low chance of 
becoming a tropical cyclone during the 5 days. 

A surface high will meander near 27N136W with moderate to 
locally fresh anticyclonic flow forecast across the tropical 
waters N of the monsoon trough and ITCZ, and W of 122W through 
the middle of the week. An area of 7 to 9 ft seas is observed 
across the tropical waters from 12N to 22N W of 134W. These 
conditions will shift W of the area tonight.