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Eastern North Pacific Tropical Weather Discussion



000
AXPZ20 KNHC 022109
TWDEP 

TROPICAL WEATHER DISCUSSION                                  
NWS NATIONAL HURRICANE CENTER MIAMI FL                      
2205 UTC MON MAY 02 2016

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
2100 UTC.

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

A SURFACE TROUGH EXTENDS FROM 10N86W TO 08N92W TO 09N101W TO
08N109W. THE ITCZ THEN BEGINS FROM 07.5N110W TO 06N119W TO
07N127W...AND CONTINUES FROM 06N128W TO 03N140W. ANOTHER SURFACE
TROUGH EXTENDS FROM 09.5N126.5W TO 06N127W. SCATTERED MODERATE
CONVECTION IS WITHIN 200 NM ON EITHER SIDE OF THE FIRST TROUGH
AND WITHIN 100 NM ON EITHER SIDE OF THE ITCZ. 

...DISCUSSION...

A COLD FRONT HAS JUST ENTERED THE FAR NW CORNER OF THE AREA
EXTENDING FROM 30N139W TO 29N140W. THE FRONT IS EXPECTED TO
CONTINUE MOVING SE WHILE WEAKENING. FRESH NORTHERLY WINDS AND
SEAS BUILDING TO BETWEEN 8 AND 12 FT ARE EXPECTED IN THE WAKE OF
THE FRONT DURING THE NEXT 48 HOURS. SEAS WILL BE HIGHEST N OF
25N AND W OF 127W THROUGH THIS PERIOD. THIS EVENT WILL PEAK
BETWEEN WEDNESDAY NIGHT AND THURSDAY NIGHT.

LATEST ALTIMETER DATA SHOWS SEAS OF 8 TO 9 FT BETWEEN 06N AND
11N AND W OF 137W. CORRESPONDING ASCAT IMAGERY INDICATES FRESH
TRADE WINDS PREVAIL IN THIS REGION. SURFACE RIDGING TO THE N
WILL BE REINFORCED BY STRONGER HIGH PRESSURE BY LATE TUESDAY.
WITH THIS...EXPECT FRESH TRADE WINDS TO PERSIST AND SEAS TOPPING
OUT JUST ABOVE 8 FT IN THIS AREA THROUGH WEDNESDAY.  

LOOKING AHEAD...A LATE SEASON COLD FRONT MOVING INTO THE GULF OF
MEXICO WILL TRIGGER A GULF OF TEHUANTEPEC GAP WIND EVENT
BEGINNING BEFORE DAWN ON THURSDAY MORNING. LATEST GUIDANCE HAS
BACKED OFF A TAD ON WIND SPEEDS BUT STILL SUGGESTS N WINDS IN
THE 20 TO 30 KT RANGE AND SEAS BUILDING TO BETWEEN 8 AND 10 FT
OVER THE GULF OF TEHUANTEPEC. EXPECT FOR THE STRONGEST WINDS AT
AROUND 1200 UTC ON THURSDAY AND FRIDAY IN CONJUNCTION WITH THE
NOCTURNAL DRAINAGE MAXIMUM.

$$

ERA