AXPZ20 KNHC 250241
Tropical Weather Discussion
NWS National Hurricane Center Miami FL
225 UTC Tue Apr 25 2017
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
Based on 0000 UTC surface analysis and satellite imagery through
...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...
A trough axis extends from near 07N84W to 06N91W to 04N100W,
where scatterometer winds indicate an ITCZ axis forms and extends
westward to 04N110W to 06N119W to beyond 05N140W. Scattered
moderate/isolated strong convection is within 120 nm south of
the trough axis between 91W and 95W, and from 07N to 10N between
113W and 118W. Scattered moderate convection is within 120 nm
north of the axis between 128W and 131W.
OFFSHORE WATERS WITHIN 250 NM OF MEXICO...
A 1026 mb high centered at 32N178W extends a ridge southeastward
to near 18N115W. Moderate to fresh northwesterly winds are
observed south of 30N west of the Baja Peninsula to near 125W,
with 8 to 10 ft seas in long period NW swell. Near gale to gale
force northwest winds are occurring north of the discussion area
off the coast of Southern California. Strong northwest winds and
associated seas will soon spread to the south of 30N tonight,
and reach near 25N by Tuesday night, then diminish on Wednesday.
Combined seas will build to around 12 ft with these strong winds
on Tuesday, and continue through Wednesday.
Gulf of Tehuantepec: The pressure gradient over southeastern
Mexico continues to weaken. This will allow for winds across the
Gulf to diminish further through early on Tuesday. Present
northeast swell producing combined seas to 8 ft between 95W and
98W will continue to decay through tonight. These seas will
subside to less than 8 ft early on Tuesday.
Gulf of California: Fresh to strong southwest winds over a
portion of the northern Gulf as a result of a tight gradient
between the typical thermal trough across the Gulf and strong
ridging to its west. As the gradient slacken some through Tuesday
afternoon, these winds will then diminish to fresh category by
then. Mostly gentle to moderate southerly flow is expected
elsewhere over the Gulf through Wednesday.
OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, AND
WITHIN 750 NM OF ECUADOR...
A gentle onshore breeze is expected during the day time hours,
then become offshore along the coast at night. Combined seas of
4 to 6 ft mainly in southwest to west swell will continue through
Wednesday, except for large swell in the 6 to 8 ft range
expected to prevail offshore the Galapagos Islands through
REMAINDER OF THE AREA...
A northwest to southeast ridge axis will remain the main feature
through Wednesday. The gradient south of the ridge will support
mainly fresh northeast winds over over much of this area. Expect
7 to 8 ft northwest swell to gradually subside from the northwest
through Wednesday over the northeast part of the area outside
250 nm of the Baja California Peninsula coast.