AXPZ20 KNHC 190908
Tropical Weather Discussion
NWS National Hurricane Center Miami FL
1005 UTC Tue Mar 19 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
Based on 0600 UTC surface analysis and satellite imagery through
Gulf of Tehuantepec Gale Warning: A ridge across east and
southeast Mexico will support strong offshore gap winds across
the Gulf of Tehuantepec through Thu night, pulsing to minimal
gale force in early morning hours. Strong to near gale force
winds will continue to spill across the Tehuantepec region for
the next few days to maintain the strong winds on the Pacific
side of the isthmus. Seas will build to around 12 ft during peak
winds, and spread large seas 8 ft or more downstream to near
12N97W each night.
Please see the latest High Seas Forecast issued by the National
Hurricane Center under AWIPS/WMO headers FZPN03 KNHC/HSFEP2 or
at website https://www.nhc.noaa.gov/text/MIAHSFEP2.shtml for
...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...
A trough extends from 09N85W to 05N93W. The ITCZ continues from
05N93W to 01.5N105W TO 01N140W. Scattered moderate showers are
within 30 nm of the ITCZ axis between 95W and 100W.
OFFSHORE WATERS WITHIN 250 NM OF MEXICO...
Please see the Special Features section above for more details
about the developing Gale Warning in the Gulf of Tehuantepec.
Gulf of California: Light to gentle winds prevail across the
Gulf as a weak pressure gradient dominates the region. A weak
cold front will approach the northern Gulf late tonight into
Wed. This will enhance moderate to fresh S to SW gap winds north
of 29N that will continue into Wed night. Otherwise, light to
moderate winds will prevail across the region through Fri night.
Elsewhere, high pressure centered west of Baja California is
supporting moderate N to NW winds over the northern waters that
will persist through tonight. NW swell associated with a dying
cold front will spread across the area tonight through Wed night
with seas building to 11 ft off Baja California Norte. NW swell
will reach the Revillagigedo Islands Thu, then gradually decay
through late week.
OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, AND
WITHIN 750 NM OF ECUADOR...
Gulf of Papagayo: The pressure gradient across Central America
has begun to weaken but continues to support occasional strong
offshore gap winds across the Gulf of Papagayo, with downstream
seas to 8 ft. Fresh to strong NE to E winds will continue across
the Gulf through Fri night, maximizing each night.
Gulf of Panama: Fresh northerly winds across the Gulf of Panama
today will diminish to moderate to fresh tonight Tue through
Between Ecuador and the Galapagos Islands, 5-7 ft seas in SW
swell will persist through early Wed. Elsewhere, generally light
to moderate winds and 3-5 ft seas will prevail for the next
REMAINDER OF THE AREA...
A cold front extends from 30N128W TO 19N138W this morning. Fresh
to strong southerly winds will continue along and within 60 nm
east of the front this morning north of 25N as the front moves
eastward. Large NW swell behind the front is producing seas to
18 ft across the far NW waters, and will propagate across the
region with 8 ft seas reaching to near 120W by Tue night.
Elsewhere, weak high pressure centered near 26N119W anchors a
broad ridge axis that extends southeast toward the Revillagigedo
Islands. The gradient between the ridge and the ITCZ supports
moderate to fresh trade winds mainly S of 18N and west of 116W
to the ITCZ. Seas across this region are 7-8 ft with NW and SW
swell combining with NE wind waves. High pressure will build
across the far northwest waters Wed and move eastward through
Fri night behind a cold front. The stronger pressure gradient
will increase trade winds S of 20N to the ITCZ with seas to 11
ft on Wed in mixed NW and NE swell. Another cold front will
approach from the northwest toward the end of the week with more
large long period NW swell.