[Tropical] Tropical Weather Discussion

[EMWIN Server]

AXNT20 KNHC 221725
TWDAT

TROPICAL WEATHER DISCUSSION
NWS NATIONAL HURRICANE CENTER MIAMI FL
205 PM EDT TUE JUL 22 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 1200 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH
1715 UTC.

...SPECIAL FEATURES...

AT 1500 UTC...TROPICAL DEPRESSION TWO WAS LOCATED NEAR 12.6N
48.0W OR ABOUT 750 NM E OF THE LESSER ANTILLES. THE ESTIMATED
MINIMUM CENTRAL PRESSURE IS 1012 MB. MAXIMUM SUSTAINED WINDS ARE
30 KT WITH GUSTS TO 40 KT. LITTLE CHANGE IN INTENSITY EXPECTED
THROUGH WED...BUT SOME WEAKENING IS FORECAST WED NIGHT AND THU
DUE TO INCREASED SHEAR. THE DEPRESSION IS FORECAST TO DEGENERATE
INTO A LOW PRESSURE TROUGH WITHIN 2-3 DAYS. SCATTERED MODERATE
ISOLATED STRONG CONVECTION IS FROM 11N-13N BETWEEN 46W-49W. SEE
THE LATEST NHC ADVISORY UNDER AWIPS/WMO HEADERS MIATCPAT2/WTNT32
KNHC FOR MORE DETAILS.

A GALE WARNING CONTINUES IN THE SW CARIBBEAN ALONG THE COAST OF
COLOMBIA FROM 11N-14N BETWEEN 72W-75W WITH SEAS 10-12 FT. TIGHT
SURFACE PRESSURE GRADIENT EXPECTED TO PRODUCE GALE CONDITIONS
DURING LATE NIGHT AND MORNING HOURS THROUGH WED...WITH WINDS
BRIEFLY DROPPING BELOW GALE THIS AFTERNOON AND EVENING. SEE THE
LATEST ATLANTIC HIGH SEAS FORECAST UNDER AWIPS/WMO HEADERS
MIAHSFAT2/FZNT02 KNHC FOR MORE DETAILS.

...TROPICAL WAVES...

TROPICAL WAVE IN THE CENTRAL ATLC WITH AXIS EXTENDING FROM
20N38W TO 12N39W MOVING W AT 15-20 KT. DEEP LAYER MOISTURE
ASSOCIATED WITH THE WAVE IS DEPICTED ON SSMI TOTAL PRECIPITABLE
WATER VAPOR IMAGERY. DRY SAHARAN AIR LAYER N OF 14N HINDERING
SIGNIFICANT DEEP CONVECTION.

TROPICAL WAVE IN THE CENTRAL CARIBBEAN WITH AXIS EXTENDING FROM
22N81W TO 10N82W MOVING W AT 15-20 KT. DRY AIR ASSOCIATED WITH
SUBSIDENCE ALOFT TOGETHER AND DEEP LAYER SHEAR OVER THE CENTRAL
AND EASTERN CARIBBEAN IS INHIBITING SIGNIFICANT DEEP CONVECTION.

TROPICAL WAVE EXTENDS FROM THE BAY OF CAMPECHE AT 21N93W TO THE
E PACIFIC AT 8N95W MOVING W AT 15-20 KT. SHOWERS ASSOCIATED WITH
THE WAVE HAVE DIMINISHED PAST 3-6 HOURS.

...ITCZ/MONSOON TROUGH...

THE MONSOON TROUGH EXTENDS FROM THE AFRICAN COAST NEAR 11N15W TO
5N35W. THE INTERTROPICAL CONVERGENCE ZONE AXIS EAST OF T.D. TWO
EXTENDS FROM 11N35W TO 13N46W. THE ITCZ CONTINUES W OF T.D. TWO
FROM 11N49W TO THE SOUTH AMERICAN COAST NEAR 9N61W. SCATTERED
MODERATE ISOLATED STRONG CONVECTION IS WITHIN 120 NM N AND 75 NM
S OF THE MONSOON TROUGH AXIS BETWEEN E OF 29W.

...DISCUSSION...

GULF OF MEXICO...

A WELL DEFINED UPPER LEVEL LOW IS CENTERED NEAR 30N89W WITH A
1016 MB LOW REFLECTED AT THE SURFACE ALONG A STATIONARY FRONT
NEAR MOBILE ALABAMA. SCATTERED MODERATE CONVECTION IS WELL SOUTH
OF THE LOW FROM 27N TO 28.5N BETWEEN 86W-93W. LIGHT ANTICYCLONIC
SURFACE WINDS ARE NOTED IN THE NORTH-CENTRAL GULF...AND LIGHT TO
MODERATE EAST-SOUTHEAST WINDS ARE NOTED ELSEWHERE. SCATTERED
MODERATE CONVECTION REMAINS OVER S FLORIDA...THE STRAITS OF
FLORIDA...AND EXTREME SE GULF. MOSTLY FAIR WEATHER IS NOTED OVER
THE REMAINDER OF THE GULF. UPPER LEVEL DIFFLUENCE IS ENHANCING
CONVECTION OVER S FLORIDA. LITTLE CHANGE EXPECTED NEXT 24 HOURS.

CARIBBEAN SEA...

15-25 KT TRADE WINDS PREVAIL OVER REMAINDER OF THE BASIN OUTSIDE
WITH STRONGEST WINDS TO GALE FORCE ACROSS THE CENTRAL CARIBBEAN.
VERY LITTLE CONVECTION IS EVIDENT IN THE REGION THIS MORNING BUT
ACTIVE CONVECTION IS EXPECTED TO DEVELOP OVER THE ISLANDS FROM
STRONG DAYTIME HEATING EFFECTS. AN UPPER LEVEL LOW CENTERED OVER
JAMAICA IS ENHANCING POTENTIAL FOR WIDESPREAD SHOWERS OVER THE
VIRGIN ISLANDS...PUERTO RICO...AND HISPANIOLA. LITTLE CHANGE
EXPECTED ELSEWHERE.

...HISPANIOLA...

THE UPPER LEVEL LOW NEAR JAMAICA IS EXPECTED TO DRIFT W TO THE
CAYMAN ISLANDS THROUGH WED. EXPECT ACTIVE WIDESPREAD CONVECTION
OVER HISPANIOLA DURING AFTERNOON AND EVENING HEATING MAXIMUM.

ATLANTIC OCEAN...

SCATTERED MODERATE CONVECTION IS OVER THE W ATLANTIC N OF CUBA W
OF 77W DUE TO HIGH MOISTURE VALUES ASSOCIATED WITH TROPICAL WAVE
ALONG 82W AND UPPER LEVEL DIFFLUENCE E OF THE UPPER LOW CENTERED
NEAR MOBILE ALABAMA. A BROAD RIDGE ALONG 30-31N ANCHORED BY 1026
MB HIGH CENTERED IN THE CENTRAL ATLANTIC NEAR 32N39W PRODUCING
MOSTLY FAIR WEATHER ALL ACROSS THE REGION E OF 77W WITH NOTABLE
EXCEPTION OF SMALL AREA OF SHOWERS AND T-STORMS ASSOCIATED WITH
T.D. TWO IN THE DEEP TROPICS. A LARGE UPPER LEVEL LOW CENTERED
NEAR 27N65W IS SUPPORTING STRONG MID-LEVEL SUBSIDENCE. A LARGE
UPPER LEVEL HIGH IS CENTERED NEAR 26N50W IS SUPPORTING MODERATE
UPPER LEVEL SUBSIDENCE. LITTLE CHANGE EXPECTED NEXT 24 HOURS.

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

$$
MUNDELL


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