000
AXPZ20 KNHC 191457
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC WED SEP 19 2012

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 1200 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
1500 UTC.

...SPECIAL FEATURES...

TROPICAL DEPRESSION LANE IS CENTERED AT 20.9N 131.3W AT 1500 UTC 
MOVING W OR 280 DEG AT 5 KT. MAXIMUM SUSTAINED WINDS ARE 30 KT 
WITH GUSTS TO 40 KT AND A MINIMUM PRESSURE OF 1009 MB. CURRENTLY 
ONLY A SINGLE CLUSTER OF MODERATE CONVECTION IS DISSIPATING WELL 
NE OF THE EXPOSED CENTER...WITHIN 30 NM OF 23N129W. LANE IS 
MOVING OVER RELATIVELY COOL SURFACE WATERS AND IS FORECAST TO 
WEAKEN TO A REMNANT LOW THIS EVENING. SEE THE LATEST NHC 
FORECAST/ADVISORY UNDER AWIPS/WMO HEADERS MIATCMEP2/WTPZ22 KNHC 
FOR ADDITIONAL DETAILS.

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

MONSOON TROUGH EXTENDS FROM GULF OF PANAMA AT 08N78W TO 13N90W 
TO 1009 MB LOW AT 12N96W TO 09N108W. ITCZ AXIS EXTENDS FROM 
09N108W TO 10N120W TO 1011 MB LOW AT 08N123W TO 06N130W TO 
10N140W. ISOLATED MODERATE TO STRONG CONVECTION IS FROM 08N TO 
18N BETWEEN 85W AND 108W. SCATTERED MODERATE ISOLATED STRONG 
CONVECTION IS FROM 05N TO 10N BETWEEN 110W AND 128W.
 
...DISCUSSION...

AN UPPER LEVEL HIGH IS CENTERED OVER THE EASTERN NORTH PACIFIC 
NEAR 18N126W. A RIDGE AXIS EXTENDS NE TO S CALIFORNIA AT 
33N117W. ELSEWHERE...NE TO E UPPER LEVEL WINDS ARE E OF 115W TO 
COLOMBIA.  

TWO SURFACE LOWS ARE EMBEDDED ON THE MONSOON TROUGH/ ITCZ. SEE 
ABOVE. THE LOW AT 12N96W MERITS WATCHING FOR POTENTIAL DEEPENING 
AND INCREASED CONVECTION.  

ELSEWHERE AT THE LOW LEVELS THE REMNANTS OF TROPICAL CYCLONE 
KRISTY ARE NEAR 24N117W AND ESTIMATED AT 1014 MB...AND ARE 
EXPECTED TO WEAKEN INTO AN OPEN TROUGH LATER TODAY AND 
DISSIPATE BY THU.

GAP WINDS...BUILDING HIGH PRESSURE IN THE WAKE OF A FRONT THAT 
HAS STALLED DISSECTING THE GULF OF MEXICO FROM NE-SW. 20 TO 25 
KT WINDS ARE GOING THROUGH THE ISTHMUS OF TEHUANTEPEC AND INTO 
THE GULF OF TEHUANTEPEC. THESE DRAINAGE WINDS WILL INCREASE TO 
25 TO 30 KT TONIGHT AND THEN PULSE THROUGH THE WEEKEND WITH THE 
STRONGEST WINDS OCCURRING LATE AT NIGHT TILL A FEW HOURS AFTER 
SUNRISE EACH DAY.
 
$$
FORMOSA