Development with Tropical Wave in MDR?

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gatorcane
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Re: Development with Strong Tropical Wave in MDR?

#161 Postby gatorcane » Tue Jul 14, 2009 9:59 pm

wxman57 wrote:
BigA wrote:I guarantee that if this system was identical, but was located 100 miles off the Florida coast the tropical outlook would not say "tropical storm formation is not expected through Wednesday." I can't really blame the Hurricane Center for this, as they have far better access to information closer to the United States.

That said, its a purely academic matter unless it actually has the potential to become a strong system or threaten land


The difference is that systems typically move off the coast of Africa and weaken within the first 24-48 hours in July, whereas that's not necessarily the case near Florida. And a system near land has the potential to be a threat very quickly. So a system that looks like this near Florida would warrant much greater attention.

Oh, and the convection is decreasing quite rapidly now. I still think it'll be another few weeks before Ana forms. I keep thinking August 8th for some reason...


The western wave at about 37W is flaring up tonight. The GFS has handled this system perfectly so far. As of 18Z, its calling for this wave to hang together and form a surface low while the area behind it fizzles/merges in with this wave.

Although the SAL and subsidence are working to prevent any kind of significant organization, it has not killed it off yet by any means. If the GFS is correct, this is the wave that develops the surface low that tracks generally WNW over the next several days.

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Re: Development with Strong Tropical Wave in MDR?

#162 Postby cycloneye » Tue Jul 14, 2009 10:04 pm

This is the leading vagon of the train of waves. :)

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Re: Development with Strong Tropical Wave in MDR?

#163 Postby weatherwindow » Wed Jul 15, 2009 4:45 am

comment from nws/mia AFD 352am 7/15....TUESDAY...TIME TO LOOK TO THE EAST!!! GLOBAL MODELS (GFS, ECMWF)
HAVE BEEN PERSISTENT IN DEVELOPING A RATHER HEALTHY TROPICAL WAVE
OVER THE WESTERN ATLANTIC JUST OFF AFRICA. PREVIOUS RUN OF BOTH, GFS
AND ECMWF, DEVELOPED A CYCLONIC CIRCULATION WITH THIS SYSTEM BY THE
TIME IT REACHES THE SOUTHEASTERN BAHAMAS, THEN RECURVED IT NORTHWARD
AROUND THE PERIPHERY OF THE ATLANTIC RIDGE. HOWEVER, LATEST RUNS
OF THESE MODELS PUSH THE SYSTEM FURTHER WESTWARD AND BRING IT
RATHER CLOSE TO SOUTH FLORIDA (TOO CLOSE FOR COMFORT) BEFORE
RECURVING. WHILE THIS IS STILL TOO FAR IN THE FUTURE AND THE
MODELS ARE BOUND TO CHANGE MANY TIMES, IT IS NOT OUT OF THE REALM
OF POSSIBILITIES AS WE ENTER THE ACTIVE PORTION OF THE ATLANTIC
HURRICANE SEASON, AND IT BEARS WATCHING.
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#164 Postby Gustywind » Wed Jul 15, 2009 5:47 am

000
AXNT20 KNHC 151043
TWDAT

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
805 AM EDT WED JUL 15 2009

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...METEOROLOGICAL ANALYSIS...WEATHER
OBSERVATIONS...AND RADAR.

BASED ON 0600 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY
THROUGH 1045 UTC.

...TROPICAL WAVES...
A TROPICAL WAVE IS ALONG 24W S OF 15N MOVING W NEAR 15 KT.
RECENT VISIBLE SATELLITE IMAGERY DEPICTS MID-LEVEL CYCLONIC
CIRCULATION NEAR THIS WAVE. SCATTERED MODERATE CONVECTION IS
FROM 7N-12N BETWEEN 23W-28W.

$$
COHEN
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#165 Postby Gustywind » Wed Jul 15, 2009 5:48 am

:uarrow:
...ITCZ...

THE ITCZ AXIS IS CENTERED ALONG 11N15W 10N27W 10N37W 9N50W
9N61W. NUMEROUS MODERATE/SCATTERED STRONG CONVECTION IS FROM
6N-14N E OF 22W. SCATTERED MODERATE CONVECTION IS FROM 10N-12N
BETWEEN 42W-46W. SCATTERED MODERATE CONVECTION IS ALSO FROM
8N-10N BETWEEN 53W-56W.
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Re: Development with Strong Tropical Wave in MDR?

#166 Postby cycloneye » Wed Jul 15, 2009 5:59 am

Regardless of what happens if at all with any of these waves in terms of developing or not,some bad weather is instore for the Eastern Caribbean islands starting next weekend and extending into next week.
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Re: Development with Strong Tropical Wave in MDR?

#167 Postby HURRICANELONNY » Wed Jul 15, 2009 6:49 am

The GFS thousands of miles away. That's funny. I'm surprised the local Miami even talks about it. A huge east coast trough will set up come Sat- Sun. More rain for S. Florida. :roll:
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#168 Postby AdamFirst » Wed Jul 15, 2009 8:44 am

Local mets here in the Palm Beach area even mentioned this system.

One of those "it's thousands of miles away, just keep an eye on it" kind of mentions
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Re: Development with Strong Tropical Wave in MDR?

#169 Postby gatorcane » Wed Jul 15, 2009 8:45 am

BEAR WATCH activated by NWS Miami...this is a bit more "hype" than I am used to seeing from them, albeit it is the first time they get to mention something in the tropics in their discussion.

TUESDAY...TIME TO LOOK TO THE EAST!!! GLOBAL MODELS (GFS, ECMWF)
HAVE BEEN PERSISTENT IN DEVELOPING A RATHER HEALTHY TROPICAL WAVE
OVER THE WESTERN ATLANTIC JUST OFF AFRICA. PREVIOUS RUN OF BOTH, GFS
AND ECMWF, DEVELOPED A CYCLONIC CIRCULATION WITH THIS SYSTEM BY THE
TIME IT REACHES THE SOUTHEASTERN BAHAMAS, THEN RECURVED IT NORTHWARD
AROUND THE PERIPHERY OF THE ATLANTIC RIDGE. HOWEVER, LATEST RUNS
OF THESE MODELS PUSH THE SYSTEM FURTHER WESTWARD AND BRING IT
RATHER CLOSE TO SOUTH FLORIDA (TOO CLOSE FOR COMFORT) BEFORE
RECURVING. WHILE THIS IS STILL TOO FAR IN THE FUTURE AND THE
MODELS ARE BOUND TO CHANGE MANY TIMES, IT IS NOT OUT OF THE REALM
OF POSSIBILITIES AS WE ENTER THE ACTIVE PORTION OF THE ATLANTIC
HURRICANE SEASON, AND IT BEARS WATCHING


http://forecast.weather.gov/product.php ... glossary=1

Here is why they wrote that:

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Ed Mahmoud

Re: Development with Strong Tropical Wave in MDR?

#170 Postby Ed Mahmoud » Wed Jul 15, 2009 9:06 am

JB still likes the waves just mosying along until North of the Greater Antilles, when interaction with a polar branch feature may cause close in development.
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Re: Development with Strong Tropical Wave in MDR?

#171 Postby Sanibel » Wed Jul 15, 2009 9:22 am

Pulse down in favorability. The waves are responding by drying up. We've seen dead waves like this revive further west when favorability turns back on. Atlantic is still eating African waves alive.
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Re: Development with Strong Tropical Wave in MDR?

#172 Postby Frank2 » Wed Jul 15, 2009 9:32 am

Thanks, Sanibel - I'll put the phone down, now...

LOL

P.S. Glad to hear another trough is setting up over Florida by this weekend - the rain keeps the temps down...
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#173 Postby gatorcane » Wed Jul 15, 2009 10:15 am

We see the wave on the NAM run for the first time entering the picture on the right side. It looks like the NAM is with the CMC, keeping the wave on a lower lattitude and on a more westward course. Since it is shallow and not developed it makes sense.

Looks like some rainfall headed towards the islands.

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#174 Postby floridasun78 » Wed Jul 15, 2009 11:09 am

i have feeling first wave moving SAL to west so second wave off afica got better chance of all other wave that why miami weather office spoke about if think didnot have chance their wont spoke about it
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Re: Development with Strong Tropical Wave in MDR?

#175 Postby Sanibel » Wed Jul 15, 2009 12:12 pm

Every day until August represents a tick upward in tropical favorability.


It's interesting how the down pulse can happen regionally where all the waves go negative at once.
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Ed Mahmoud

Re: Development with Strong Tropical Wave in MDR?

#176 Postby Ed Mahmoud » Wed Jul 15, 2009 12:35 pm

12Z GFS weakens all the waves. Lead wave arrives in less than 4 days to Puerto Rico without a whole lot of excitement.

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Re: Development with Strong Tropical Wave in MDR?

#177 Postby Stormcenter » Wed Jul 15, 2009 1:13 pm

That's not good news if your looking for some sore of development. The GFS is the gung ho model for development and if it sees nothing then chances are slim and none.


Ed Mahmoud wrote:12Z GFS weakens all the waves. Lead wave arrives in less than 4 days to Puerto Rico without a whole lot of excitement.

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Re: Development with Strong Tropical Wave in MDR?

#178 Postby gatorcane » Wed Jul 15, 2009 2:17 pm

The folks at NWS Miami think the wave is going to impact South Florida (as a wave though and nothing more):

AT THE SAME TIME...A TROPICAL WAVE OVER THE FAR EASTERN ATLANTIC
WATERS WILL MOVE WEST TO NORTHWEST TOWARDS SOUTH FLORIDA THROUGH
THE WEEKEND...BRINGING IN SOME DRIER AIR TO THE AREA FOR THIS
WEEKEND. THE TROPICAL WAVE COULD THEN MOVE INTO SOUTH FLORIDA
EARLY NEXT WEEK ALLOWING FOR DEEPER TROPICAL MOISTURE TO WORK INTO
THE AREA. SO HAVE KEPT THE POPS IN THE SLIGHT CHANCE TO LOW END
CHANCE CAT THIS WEEKEND FOR SOUTH FLORIDA, THEN THE HIGH IN CHANCE
CAT FOR EARLY NEXT WEEK

http://forecast.weather.gov/product.php ... glossary=1
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Re: Development with Strong Tropical Wave in MDR?

#179 Postby floridasun78 » Wed Jul 15, 2009 3:43 pm

that mean i going get rain here next week
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Re: Development with Strong Tropical Wave in MDR?

#180 Postby HURRICANELONNY » Wed Jul 15, 2009 4:19 pm

If you really think about it. The NWS had to make a typo. How can a wave in the far eastern Atlantic effect our weather by this weekend. At what speed would it have to travel to inpact with even the drier side by this weekend??? :roll:
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