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Atlantic Tropical Action 2013


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TD 6 has formed deep in the Bay of Campeche.  It looks awesome.  Too bad it will be onshore in 12 hr.  Blah.

The good news is that one of these CV systems should give you a good chase (somewhere tbd).  And of course that those precious SST's in the BOC cradle aren't torn up ;)

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The 18z GFS completely dropped development of the wave depicted as a sub-980mb hurricane on previous runs over the past day. At a quick glance I don't see any reason why it would...perhaps the mets can help?

 

EDIT: Nevermind. Looks like the 18z GFS missed satellite data.

http://www.nco.ncep.noaa.gov/pmb/nwprod/realtime/gfs/t18z/index.summary.shtml

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The 18z GFS completely dropped development of the wave depicted as a sub-980mb hurricane on previous runs over the past day. At a quick glance I don't see any reason why it would...perhaps the mets can help?

 

The Euro is on the weak side until it crosses 55W. Sometimes it takes until the 18z GFS to catch

up with the 12z Euro. The 18z run starts to develop more as it gets west of 55.

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TROPICAL STORM FERNAND TROPICAL CYCLONE UPDATE
NWS NATIONAL HURRICANE CENTER MIAMI FL AL062013
645 PM CDT SUN AUG 25 2013


...RECONNAISSANCE AIRCRAFT INDICATES THAT TROPICAL DEPRESSION SIX
HAS STRENGTHENED INTO TROPICAL STORM FERNAND...

AROUND 630 PM CDT...DATA FROM AN AIR FORCE RESERVE
RECONNAISSANCE AIRCRAFT INDICATED THAT MAXIMUM SUSTAINED
WINDS IN TROPICAL DEPRESSION SIX HAD INCREASED TO AT LEAST 45 MPH...
75 KM/H...MAKING THE SYSTEM TROPICAL STORM FERNAND (PRONOUNCED
FAIR-NAHN).

A SPECIAL ADVISORY PACKAGE WILL BE ISSUED AROUND 700 PM CDT...2300
UTC...TO INCREASE THE 12-HOUR INTENSITY TO 50 KT AND TO ADJUST THE
FORECAST SOUTHWARD SLIGHTLY. NO CHANGES ARE REQUIRED TO THE CURRENT
TROPICAL STORM WARNING AREA FROM VERACRUZ TO TAMPICO MEXICO.

SUMMARY OF 630 PM CDT...2230 UTC...INFORMATION
----------------------------------------------
LOCATION...19.1N 95.7W
ABOUT 25 MI...45 KM E OF VERACRUZ MEXICO
MAXIMUM SUSTAINED WINDS...45 MPH...75 KM/H
PRESENT MOVEMENT...W OR 270 DEGREES AT 12 MPH...19 KM/H
MINIMUM CENTRAL PRESSURE...1003 MB...29.62 INCHES


$
FORECASTER STEWART

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Can it make a minimal Cat 1 in the final 12 hours???

 

 

000
URNT12 KNHC 252300
VORTEX DATA MESSAGE   AL952013
A. 25/22:31:10Z
B. 19 deg 06 min N
  095 deg 43 min W
C. NA
D. 52 kt
E. 348 deg 18 nm
F. 063 deg 42 kt
G. 348 deg 18 nm
H. EXTRAP 1003 mb
I. 18 C / 491 m
J. 23 C / 501 m
K. 18 C / NA
L. NA
M. NA
N. 12345 / 1
O. 0.02 / 3 nm
P. AF309 01BBA INVEST             OB 06
MAX FL WIND 42 KT 348/18 22:24:30Z
SLP EXTRAP FROM BELOW 1500 FT
;
 

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The center of Fernand looks to be drifting into the -83C tops to its west. 

 

Briefly looking at the data, it does appear that Fernand is already a 45-50 knot tropical cyclone and may have a weak inner core to some extent.

 

 

OTOH...

 

OTHER SYSTEMS WITH FORMATION POTENTIAL BEYOND 48 HOURS...

A TROPICAL WAVE EMERGING OFF OF THE WEST COAST OF AFRICA IS EXPECTED
TO MOVE GENERALLY WESTWARD ACROSS THE TROPICAL ATLANTIC OVER THE
NEXT SEVERAL DAYS. ENVIRONMENTAL CONDITIONS APPEAR FAVORABLE FOR
SOME DEVELOPMENT OF THIS DISTURBANCE BY MIDDLE TO LATE WEEK. THIS
SYSTEM HAS A LOW CHANCE...NEAR 0 PERCENT...OF BECOMING A TROPICAL
CYCLONE DURING THE NEXT 48 HOURS...AND A MEDIUM CHANCE...30
PERCENT...OF BECOMING A TROPICAL CYCLONE DURING THE NEXT 5 DAYS. 

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This curious little guy has been going through convective pulses all day long.  Just crossing 50W now.

attachicon.gifGOES0115201323841sfFE.jpg

That'd be a nice little microstorm.  IR2 suggests there is some low level circulation (not closed, best I can tell) and it may have some turning in the MIMIC TPW imagery.  Not a modeling guru, but people do talk of small systems escaping model detection because of resolution issues.

 

latest72hrs.gif

 

 

About the North Gulf, CIMSS at least showing a generally East-West oriented area of enhanced low to mid vorticity, maybe when Fernand moves inland and BoC pressures rise, it'll have a better chance to at least try to spin up a depression for my lawn.

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There was a microcyclone in the BOC just before Katrina developed in 2005.

 

Garrett Bastardi complied some interesting statistics about cyclones in the BOC and significant Tropical Cyclones at landfall about 1-2 weeks later. The correlation is decent.. about 26/36 storms that were Category 2 or higher at landfall, East of 90 W over the last 50 years had a little system in the BOC/Western GOMEX 1-2 weeks beforehand. There are some notable storms with this correlation.

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Garrett Bastardi complied some interesting statistics about cyclones in the BOC and significant Tropical Cyclones at landfall about 1-2 weeks later. The correlation is decent.. about 26/36 storms that were Category 2 or higher at landfall, East of 90 W over the last 50 years had a little system in the BOC/Western GOMEX 1-2 weeks beforehand.

 

Probably due to eastward progression of CCKWs, methinks.

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