000
AXPZ20 KNHC 162158
TWDEP 

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
2205 UTC Sun Jun 16 2019

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 1800 UTC surface analysis and satellite imagery through
2145 UTC.

...TROPICAL WAVES...

A tropical wave with axis along 109W from 03N to 14N is moving 
westward at 20 kt. Scattered showers and thunderstorms are seen
within 90 nm either side of the wave from 12N to 14N. In
addition, ample deep moisture leading to similar activity 
trails the wave from 12N to 17N between 99W and 107.5W. Weakening
isolated showers and thunderstorms are present within 120 nm 
east of the wave from 07N to 10N. 

A tropical wave with axis along 126W from 05N to 15N is moving 
westward at about 20 kt. Scattered strong convection is within
60 nm east of the wave from 10N to 13N.

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

The monsoon trough axis extends from NW Colombia to 08N78W to
10N86W to 09N96W and to 10N113W, where scatterometer data from
this afternoon indicated that it transitioned to the ITCZ and 
continuing to 11N124W and briefly ending there. It resumes near 
11N126W and continues to beyond 09N140W. Scattered moderate to 
isolated strong convection is within 180 nm north of the ITCZ 
between 115W and 118W and within 60 nm north of the ITCZ between 
118W and 121W. Scattered moderate convection is within 30 nm of 
the trough between 87W and 89W. 

...DISCUSSION...

OFFSHORE WATERS WITHIN 250 NM OF MEXICO... 

The pressure gradient between a high pressure ridge west of Baja 
California and a low pressure trough along the Baja California 
peninsula is maintaining moderate northwest to north winds 
across most of the adjacent offshore waters where seas remain in 
the 4-5 ft range. Winds and seas off Baja California will change
little through early on Mon as the ridge remains over offshore 
waters. However, winds will increase to fresh speeds near the 
coast this evening, mainly over the region between Punta Eugenia
and Cabo San Lazaro. Low pressure is expected to cover a rather 
expansive area over the southwestern United States and along 
California by late Mon afternoon in response to a sharpening mid 
/upper-level trough that will pass over those regions. This will 
result in the weakening of the ridge allowing for winds to 
briefly diminish through middle part of the upcoming week.

Mainly gentle southwest to south winds prevail over the southern 
half of the Gulf of California. These winds will increase to 
gentle to moderate southeast to south winds over the entire Gulf 
tonight through Mon. These winds then become light and variable 
on Tue and through Wed evening. Winds will increase to fresh 
speeds over the far northern part of the Gulf Mon night before 
diminishing to moderate speeds early on Tue. 

Long-period southwest swell is along the Mexican offshore 
waters, however the seas will remain in the 5-6 ft range through 
the middle of the upcoming week.

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

Fresh to strong nocturnal offshore winds will continue pulsing 
across the Gulf of Papagayo region through the middle part of
the upcoming week, with seas peaking around 7-8 ft downstream of
the Gulf. Otherwise, fairly tranquil conditions will persist off
Central America under a weak pressure pattern. Gentle to 
moderate south to southwest flow with scattered showers and 
thunderstorms will prevail south of the monsoon trough through 
Sun night and early into next next week. 

Long-period southwest swell propagating through the southern 
waters will build the waveheights to 9 ft between Ecuador and 
the Galapagos Islands through the remainder of this weekend. 
Wave model guidance suggests that another set of south to 
southwest swell will propagate through the southern waters west 
of 85W Tue night through Thu building waveheights there to a 
peak of 8 ft again before they begin to subside late on Thu. 

REMAINDER OF THE AREA... 

A high pressure ridge prevails across the northern waters. 
Moderate to fresh northeast winds are between the ridge and the 
ITCZ west of 116W. Latest altimeter data continue to show seas 
in the 5-7 ft range in this region. Moderate to fresh winds are 
expected to persist mainly south of 20N into early next week as 
a couple of tropical waves moves south of the ridge.

Long period southwest swell will continue to propagate through 
high seas areas east of 120W through tonight. Seas will remain 8 
to 9 ft south of the Equator through the middle of the upcoming 
week, as a reinforcing set of southwest swell is expected to 
reach the far southwestern waters by Mon night. Expect 8-9 ft 
seas south of the Equator and west of 100W by Tue. Elsewhere, 
northwest to north swell will impact the far northern waters 
west of about 125W beginning on Mon night and continuing through 
Wed night as strong high pressure builds southward to the north 
of the area and while low pressure lingers offshore California. 
Waveheights associated with the swell will likely build to 8-10 
ft north of 28N.

$$
Aguirre