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Atlantic Tropical Weather Discussion



000
AXNT20 KNHC 231000
TWDAT 

TROPICAL WEATHER DISCUSSION
NWS NATIONAL HURRICANE CENTER MIAMI FL
805 AM EDT TUE SEP 23 2014

TROPICAL WEATHER DISCUSSION FOR NORTH AMERICA...CENTRAL  
AMERICA...GULF OF MEXICO...CARIBBEAN SEA...NORTHERN SECTIONS OF 
SOUTH AMERICA...AND ATLANTIC OCEAN TO THE AFRICAN COAST FROM THE 
EQUATOR TO 32N. THE FOLLOWING INFORMATION IS BASED ON SATELLITE 
IMAGERY...WEATHER OBSERVATIONS...RADAR...AND METEOROLOGICAL 
ANALYSIS.

BASED ON 0600 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
1000 UTC.

...TROPICAL WAVES...                                     

A TROPICAL WAVE IS 140 NM W OF THE CAPE VERDE ISLANDS WITH AXIS 
EXTENDING FROM 22N26W TO A 1011 MB LOW NEAR 17N28W TO 12N28W 
MOVING W AT 10-15 KT. AN AREA OF WARM DRY AIR W OF THE LOW 
CENTER IS DEPICTED IN THE SSMI TPW AND THE METEOSAT SAL IMAGERY. 
SAHARAN DUST IS ALSO IN THE WAVE ENVIRONMENT...RESULTING IN THE 
LACK OF CONVECTION OVER MOST OF THE AREA COVERED BY THIS WAVE. 
ONLY A FEW SHOWERS ARE NOTICED ALONG 19N BETWEEN 25W-28W. 

A TROPICAL WAVE IS ON THE CENTRAL ATLANTIC WITH AXIS EXTENDING 
FROM 18N44W TO 07N46W...MOVING W AT 20 KT. DRY AND STABLE 
SAHARAN AIR IS ALSO IN THE ENVIRONMENT OF THIS WAVE...LIMITING 
THE CONVECTION TO THE SOUTHERN PORTION OF THE WAVE AXIS FROM 11N-
13N BETWEEN 41W-48W. 

A TROPICAL WAVE IS MOVING ACROSS THE MONA PASSAGE IN THE 
CARIBBEAN WITH AXIS EXTENDING FROM 21N67W TO 11N68W...MOVING W 
AT 10 KT. DEEP LAYER MODERATE MOISTURE ACCOMPANIES THIS WAVE... 
WHICH ALONG LOW-LEVEL MOISTURE CONVERGENCE AND UPPER-LEVEL 
DIFFLUENCE HELPS TO GENERATE SCATTERED MODERATE CONVECTION 
MAINLY ACROSS THE NORTHERN PORTION OF THE WAVE AXIS N OF 17N 
BETWEEN 64W-70W. 

A TROPICAL WAVE IS ACROSS WESTERN CUBA WITH AXIS EXTENDING FROM 
23N84W TO NORTHERN COSTA RICA NEAR 10N85W. THIS WAVE IS MOVING W 
AT 10 KT. DRY AIR SUBSIDENCE FROM ALOFT IS LIMITING THE  
DEVELOPMENT OF CONVECTION ACROSS THE WAVE. SCATTERED MODERATE 
CONVECTION CONTINUES IN THE VICINITY OF THE WAVE AXIS...WHICH IS 
BEING ENHANCED BY AN UPPER-LEVEL TROUGH LOCATED ACROSS THE 
EASTERN GULF AND EXTENDING TO THE YUCATAN PENINSULA.

...ITCZ/MONSOON TROUGH...                                     

THE MONSOON TROUGH EXTENDS FROM 14N22W TO A 1011 MB LOW NEAR 
17N28W TO 12N30W TO 08N49W. ASIDE FROM CONVECTION OCCURRING WITH 
THE TROPICAL WAVES...ISOLATED CONVECTION IS ALONG 12N BETWEEN 
32W-38W. 

...DISCUSSION... 

GULF OF MEXICO...                                          

A UPPER-LEVEL TROUGH ALONG THE EASTERN US EXTENDS ITS BASE 
ACROSS THE EASTERN GULF AND ACROSS THE FLORIDA PENINSULA. THIS 
TROUGH SUPPORTS A PAIR OF FRONTAL BOUNDARIES...A STATIONARY 
FRONT ANALYZED ACROSS NORTHERN FLORIDA CONNECTED TO A 1008 MB 
LOW NEAR 28N84W TO 26N91W...AND A COLD FRONT ACROSS THE SE US 
EXTENDING ACROSS THE N GULF WATERS. THE COLD FRONT IS FORECAST 
TO MERGE WITH THE STATIONARY ONE SOMETIME TODAY. SE OF THE UPPER-
LEVEL TROUGH...RIDGING IS GENERATING DIFFLUENT FLOW WHICH ALONG 
THE ABUNDANT LOW-LEVEL MOISTURE ADVECTED FROM THE CARIBBEAN 
SUPPORTS NUMEROUS MODERATE TO STRONG CONVECTION S OF THE 
STATIONARY FRONT S OF 25N...E OF 87W. OVER THE NEXT 24-48 
HOURS...THE FRONT WILL DISSIPATE WHILE MOVING ACROSS CENTRAL 
FLORIDA. A TROPICAL WAVE IS EXPECTED TO MOVE INTO THE BAY OF 
CAMPECHE BY THURSDAY.

CARIBBEAN SEA...                                              

TWO TROPICAL WAVES ARE IMPACTING THE CARIBBEAN...FOR MORE 
INFORMATION ABOUT THESE REFER TO THE SECTION ABOVE. AN UPPER- 
LEVEL LOW WITH CENTER NEAR 18N82W IS ENHANCING SCATTERED 
MODERATE CONVECTION FROM 18N-22N BETWEEN 78W-82W. LOW-LEVEL 
MOISTURE CONVERGENCE IS ENHANCING SCATTERED MODERATE TO STRONG 
CONVECTION ACROSS THE WESTERN CARIBBEAN MAINLY W OF CUBA. 
SCATTERED MODERATE CONVECTION PREVAILS ACROSS CENTRAL AMERICA 
AND THE SOUTHERN CARIBBEAN WATERS S OF 13N ENHANCED BY THE 
MONSOON TROUGH AXIS THAT EXTENDS FROM COLOMBIA TO COSTA RICA. 
OVER THE NEXT 24-48 HOURS...THE TROPICAL WAVE ON THE EASTERN 
CARIBBEAN IS EXPECTED TO MOVE ACROSS HISPANIOLA AND THE CENTRAL 
CARIBBEAN ENHANCING CONVECTION.

...HISPANIOLA...                                             

SCATTERED SHOWERS AND THUNDERSTORMS ARE NOTICED ACROSS THE NE 
HISPANIOLA AS THE TROPICAL WAVE APPROACHES. AN INCREASE IN 
CONVECTIVE ACTIVITY IS EXPECTED OVER THE NEXT 24 HOURS AS THE 
TROPICAL WAVE MOVES ACROSS THE ISLAND AND ADJACENT WATERS.

ATLANTIC OCEAN...                                               

AN UPPER-LEVEL TROUGH IS OVER THE EASTERN US THAT SUPPORTS A 
STATIONARY FRONT ANALYZED FROM 30N78W TO 30N81W AND THEN ACROSS 
NORTHERN FLORIDA INTO THE EASTERN GULF WATERS. AN UPPER-LEVEL 
HIGH CONTINUES ACROSS THE WESTERN ATLANTIC WITH CENTER NEAR 
31N64W NEAR THE END OF A COLD FRONT. THESE SYSTEMS ARE KEEPING A 
DIFFLUENT FLOW BETWEEN THEM THAT COMBINED WITH LOW-LEVEL 
MOISTURE CONVERGENCE ARE GENERATING NUMEROUS MODERATE TO STRONG 
CONVECTION ACROSS THE BAHAMAS...SOUTH FLORIDA ATLANTIC 
WATERS...THE FLORIDA KEYS...AND NW CUBA FROM 23N-31N BETWEEN 75W-
83W. THERE IS ALSO ISOLATED CONVECTION NEAR THE CENTER OF THE 
UPPER LEVEL HIGH PREVIOUSLY MENTIONED ALONG THE FRONTAL BOUNDARY 
NEXT TO IT FROM 34N-42N BETWEEN 55W-66W. TO THE E...AN UPPER-
LEVEL LOW CENTERED NEAR 24N55W IS SUPPORTING ISOLATED MODERATE 
CONVECTION ALONG 24N BETWEEN 55W-57W. A SURFACE TROUGH WAS 
ANALYZED ALONG 50W BETWEEN 25N-31N...WHICH HAS ISOLATED MODERATE 
CONVECTION AT ABOUT 150 NM E AND W OF THE BOUNDARY.

FOR ADDITIONAL INFORMATION PLEASE VISIT 
WWW.HURRICANES.GOV/MARINE

$$
ERA



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Page last modified: Tuesday, 23-Sep-2014 10:00:29 UTC