Tropical Weather Discussion
Issued by NWS
AXPZ20 KNHC 290945
Tropical Weather Discussion
NWS National Hurricane Center Miami FL
901 UTC Sat Apr 29 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 0600 UTC surface analysis and satellite imagery through
...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...
A surface trough axis extends from 03N95W TO 06N100W TO 06N114W,
and another surface trough extends from 05N109W to 01N111W. The
ITCZ extends from 03N125W to 02N140W. Scattered moderate and
isolated strong convection are from 04N to 13N, east of 90W.
Scattered moderate convection is from 02N to 09N between 97W and
OFFSHORE WATERS WITHIN 250 NM OF MEXICO...
Fresh to strong northwest winds continue across the discussion
waters north of 26N and west of the Baja Peninsula, with seas of
8 to 12 ft in northwest swell extending as far south as 22N.
The stronger winds will decrease through today as low pressure
inland over the south central United States moves farther east.
The large swell will gradually subside below 8 ft through
Gulf of California: A cold front is expected to clip the northern
and central portion of the Gulf today, bringing strong north to
northwest winds across that portion of the Gulf. Seas will build
as high as 8 ft over the central Gulf late today. The winds and
seas will decrease tonight as the front dissipates over the
Gulf of Tehuantepec:
Gentle to moderate southerly flow is expected this weekend with
fresh north winds possible near daybreak on Monday. A stronger
gap event may occur late this upcoming week.
Elsewhere, mainly gentle to moderate winds will prevail with seas
primarily between 5 to 7 ft.
OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, AND
WITHIN 750 NM OF ECUADOR...
Clusters of thunderstorms are within 120 nm of the coasts, from
02N to 13N. Mainly gentle winds are expected during the next
several days, becoming offshore along the coasts at night.
Long period southwest swell of 5 to 7 ft will persist over the
waters through early next week, possibly reaching 8 ft offshore
Ecuador by mid week.
REMAINDER OF THE AREA...
A 1031 mb high pressure system remains just north of the area
near 37N135W, with a ridge extending southeastward to near 15N110W.
This high pressure system covers the area north of the ITCZ and
west of about 110W. Fresh to strong northwest winds north of 26N
and east of 125W will decrease today as low pressure inland over
the United States moves farther east. Fresh northeast trades are
expected between the ridge and the ITCZ the next several days,
with seas of 6 to 8 ft in mixed northeast and southwest swell
through Sunday. Additional Southern hemispheric swell will
propagate across the waters south of 05N between 100W and 120W
Sunday and Monday, resulting in seas of 8 to 9 ft.