000
AXPZ20 KNHC 090400
TWDEP 

TROPICAL WEATHER DISCUSSION    
NWS NATIONAL HURRICANE CENTER MIAMI FL
0405 UTC SAT JUL 09 2011

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 0000 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
0245 UTC.

...SPECIAL FEATURE...
HURRICANE CALVIN WAS LOCATED NEAR 16.6N 109.5W AT 09/0000 UTC 
MOVING W OR 285 DEGREES AT 10 KT. MAXIMUM SUSTAINED WINDS HAVE 
INCREASED TO 70 KT WITH GUSTS TO 85 KT. ESTIMATED MINIMUM 
CENTRAL PRESSURE IS 984 MB. SEE LATEST NHC FORECAST/ADVISORY 
UNDER AWIPS/WMO HEADERS MIATCMEP3/WTPZ23 KNHC FOR MORE DETAILS. 
NUMEROUS MODERATE TO STRONG CONVECTION IS LOCATED WITHIN 150 NM 
OF THE CENTER. 

...ITCZ/MONSOON TROUGH...
MONSOON TROUGH AXIS FROM 09N85W TO 10N90W TO 13N98W WHERE IT 
BREAKS THEN IT RESUMES AT 12N111W TO 08N117W TO 10N126W THEN 
ITCZ TO BEYOND 08N140W. SCATTERED MODERATE ISOLATED STRONG 
WITHIN 270 NM S OF MONSOON TROUGH AXIS BETWEEN 93W AND 98W. 
SCATTERED MODERATE WITHIN 90 NM OF ITCZ AXIS BETWEEN 127W AND 
134W.

...DISCUSSION...

PRESSURE GRADIENT BETWEEN HIGH PRES CENTERED NW OF THE AREA NEAR 
38N157W AND LOWER PRES ASSOCIATED WITH THE ITCZ IS SUPPORTING 
FRESH TO STRONG NE WINDS OVER THE EXTREME NW PORTION AREA NW OF 
A LINE FROM 30N133W TO 24N140W AS DEPICTED BY THE LATEST ASCAT 
PASS. WINDS ARE FORECAST TO DIMINISH BELOW 20 KT BY SAT 
AFTERNOON...WITH SEAS REMAINING ABOVE 8 FT IN NE AND SW SWELL.

CROSS-EQUATORIAL SW SWELLS WILL PREVAIL OVER THE DEEP TROPICS S 
OF 10N BETWEEN 95W AND 130W THROUGH THE WEEKEND. WAVE HEIGHTS 
ARE EXPECTED TO REACH 11 FT AS THE SWELLS CONTINUE TO PROPAGATE 
INTO THE AREA FROM THE SOUTHERN HEMISPHERE.

$$
AL



000
AXPZ20 KNHC 090400
TWDEP 

TROPICAL WEATHER DISCUSSION    
NWS NATIONAL HURRICANE CENTER MIAMI FL
0405 UTC SAT JUL 09 2011

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 0000 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
0245 UTC.

...SPECIAL FEATURE...
HURRICANE CALVIN WAS LOCATED NEAR 16.6N 109.5W AT 09/0000 UTC 
MOVING W OR 285 DEGREES AT 10 KT. MAXIMUM SUSTAINED WINDS HAVE 
INCREASED TO 70 KT WITH GUSTS TO 85 KT. ESTIMATED MINIMUM 
CENTRAL PRESSURE IS 984 MB. SEE LATEST NHC FORECAST/ADVISORY 
UNDER AWIPS/WMO HEADERS MIATCMEP3/WTPZ23 KNHC FOR MORE DETAILS. 
NUMEROUS MODERATE TO STRONG CONVECTION IS LOCATED WITHIN 150 NM 
OF THE CENTER. 

...ITCZ/MONSOON TROUGH...
MONSOON TROUGH AXIS FROM 09N85W TO 10N90W TO 13N98W WHERE IT 
BREAKS THEN IT RESUMES AT 12N111W TO 08N117W TO 10N126W THEN 
ITCZ TO BEYOND 08N140W. SCATTERED MODERATE ISOLATED STRONG 
WITHIN 270 NM S OF MONSOON TROUGH AXIS BETWEEN 93W AND 98W. 
SCATTERED MODERATE WITHIN 90 NM OF ITCZ AXIS BETWEEN 127W AND 
134W.

...DISCUSSION...

PRESSURE GRADIENT BETWEEN HIGH PRES CENTERED NW OF THE AREA NEAR 
38N157W AND LOWER PRES ASSOCIATED WITH THE ITCZ IS SUPPORTING 
FRESH TO STRONG NE WINDS OVER THE EXTREME NW PORTION AREA NW OF 
A LINE FROM 30N133W TO 24N140W AS DEPICTED BY THE LATEST ASCAT 
PASS. WINDS ARE FORECAST TO DIMINISH BELOW 20 KT BY SAT 
AFTERNOON...WITH SEAS REMAINING ABOVE 8 FT IN NE AND SW SWELL.

CROSS-EQUATORIAL SW SWELLS WILL PREVAIL OVER THE DEEP TROPICS S 
OF 10N BETWEEN 95W AND 130W THROUGH THE WEEKEND. WAVE HEIGHTS 
ARE EXPECTED TO REACH 11 FT AS THE SWELLS CONTINUE TO PROPAGATE 
INTO THE AREA FROM THE SOUTHERN HEMISPHERE.

$$
AL