603
AXPZ20 KNHC 182011
TWDEP
TROPICAL WEATHER DISCUSSION
NWS NATIONAL HURRICANE CENTER MIAMI FL
2205 UTC THU DEC 18 2025
TROPICAL WEATHER DISCUSSION FOR THE EASTERN PACIFIC OCEAN FROM
03.4S TO 30N, EAST OF 120W INCLUDING THE GULF OF CALIFORNIA, AND
FROM THE EQUATOR TO 30N, BETWEEN 120W AND 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
2000 UTC.
..INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH
THE MONSOON TROUGH EXTENDS FROM THE COAST OF COSTA RICA FROM
NEAR 09N83W TO 09N110W. THE ITCZ CONTINUES FROM 09N110W TO
BEYOND 07N140W. SCATTERED MODERATE CONVECTION IS NOTED FROM
06N-15N EAST OF 100W.
..OFFSHORE WATERS WITHIN 250 NM OF MEXICO
A 1026 MB HIGH CENTER CENTERED AT 31N129W WITH LOWER PRESSURE THE
SW UNITED STATES IS PRODUCING MODERATE TO FRESH NW WINDS WEST OF
BAJA CALIFORNIA NORTE. ELSEWHERE, WINDS ARE GENTLE OR WEAKER.
SEAS ARE 6-8 FT WEST OF BAJA CALIFORNIA NORTE, 1-2 FT IN THE GULF
OF CALIFORNIA, AND 3-5 FT ELSEWHERE. NO SIGNIFICANT DEEP
CONVECTION IS OCCURRING.
FOR THE FORECAST, WITH A WEAK PRESSURE GRADIENT PREVAILING,
WINDS ACROSS FORECAST WATERS SHOULD REMAIN MODERATE OR WEAKER
THROUGH TOMORROW MORNING. BY TOMORROW AFTERNOON, A TEHUANTEPECER
GAP WIND EVENT WILL BEGIN WITH FRESH TO NEAR GALE N TO NE WINDS.
THE WINDS WILL DIMISH SOME SAT INTO SUN, BUT BY SUN NIGHT THEY
SHOULD CONTINUE WITH FRESH TO NEAR GALE OVER THE GULF OF
TEHUANTEPEC THROUGH MID NEXT WEEK. ELSEWHERE, WINDS AND SEAS
SHOULD REMAIN QUIESCENT FOR THE NEXT SEVERAL DAYS.
...OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA,
AND WITHIN 750 NM OF ECUADOR...
WINDS ACROSS FORECAST WATERS ARE MODERATE OR WEAKER WITH SEAS 3-5
FT. SCATTERED MODERATE CONVECTION IS OCCURRING WITHIN 150 NM OF
THE COASTS OF GUATEMALA, EL SALVADOR, COSTA RICA, AND PANAMA.
FOR THE FORECAST, A LIGHT PRESSURE GRADIENT WILL CONTINUE TO
ONLY FORCE MODERATE OR WEAKER WINDS ACROSS FORECAST WATERS
THROUGH FRI. BUILDING HIGH PRESSURE OVER CENTRAL AMERICA WILL
DRIVE FRESH TO LOCALLY STRONG NE WINDS MAINLY DURING LATE
NIGHT/EARLY MORNING HOURS ACROSS THE GULF OF PAPAGAYO REGION FROM
FRI EVENING THROUGH MID NEXT WEEK. ELSEWHERE, WINDS AND SEAS
WILL BE QUIESCENT.
..REMAINDER OF THE AREA
A 1026 MB HIGH CENTERED AT 31N129W NORTH OF OUR WATERS ALONG
WITH LOWER PRESSURE OVER THE ITCZ IS FORCING ONLY MODERATE TO
LOCALLY FRESH NE TRADES NORTH OF THE ITCZ. SOUTH OF THE
ITCZ/MONSOON TROUGH, THE SE TRADES AND SW MONSOONAL WINDS ARE
GENTLE TO MODERATE. SEAS ARE 4-7 FT.
FOR THE FORECAST, LITTLE CHANGE IS EXPECTED THROUGH SUN. STARTING
SUN NIGHT, A SURFACE TROUGH IS EXPECTED TO FORM ALONG THE ITCZ
NEAR 120W ENHANCING DEEP CONVECTION AND STRENGTHENING WINDS FOR
A COUPLE OF DAYS. AT THE SAME TIME, A COLD FRONT IS ANTICIPATED
TO REACH OUR NW CORNER AT 30N140W AND BRING WITH IT MODERATE TO
FRESH SW AHEAD OF THE FRONT AND MODERATE TO FRESH N WINDS BEHIND
THE FRONT ON MON AND TUE. A LARGE NW SWELL OF 8-12 FT SHOULD ALSO
REACH OUR NW WATERS BEGINNING MON NIGHT.
LANDSEA
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