Long Range Models

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tolakram
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Re: Long Range Models

#341 Postby tolakram » Tue Jul 29, 2008 11:32 am

jhamps10 wrote:you mean your saying it hasn't kicked off yet.... Bertha and Dolly both came from CV waves, and it looks like we could get 2 more storms off of CV waves before the month ends.



CV means a tropical storm forms in the CV area, not that a storm forms from a wave that moved through that area, since nearly all of them do.

http://en.wikipedia.org/wiki/Cape_Verde-type_hurricane
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Re: Long Range Models

#342 Postby Meso » Tue Jul 29, 2008 1:21 pm

Image

Again the CMC is developing a rigorous storm off Africa within the next week.
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Ed Mahmoud

Re: Long Range Models

#343 Postby Ed Mahmoud » Tue Jul 29, 2008 4:01 pm

Saw 2 different NWS WSO mention this isn their AFDs, although both thought GFS was too aggressive.

Current Northern GOMEX blob didn't quite make it, maybe the next one can...


12Z GFS predicts sub-tropical cyclone for New Orleans on Monday
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Re: Long Range Models

#344 Postby njweather » Tue Jul 29, 2008 4:08 pm

Ed Mahmoud wrote:Saw 2 different NWS WSO mention this isn their AFDs, although both thought GFS was too aggressive.

Current Northern GOMEX blob didn't quite make it, maybe the next one can...


12Z GFS predicts sub-tropical cyclone for New Orleans on Monday


12Z, GFS, 144hrs
Image

Hmm. As we all know, the models are better at forecasting the location of development than they are the intensity of development...
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Re: Long Range Models

#345 Postby njweather » Wed Jul 30, 2008 9:02 am

00Z EURO, 120hrs

Image

Seems to forecast a fairly large Low in the Caribbean...
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Re: Long Range Models

#346 Postby cycloneye » Wed Jul 30, 2008 3:20 pm

GFS at 384 hours (Fantasyland) has a developing low in the Central Atlantic.But being in mid August,when the real season starts,anything east of the islands that the models show has to be followed in the next runs to see if its consistent with the feature.

Image
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Re: Long Range Models

#347 Postby RL3AO » Wed Jul 30, 2008 3:47 pm

In the Caribbean right now, there are fast low level winds (850mb) of 25 to 30kts. However, the middle to upper levels (500mb to 200mb) have very light winds (5 to 10 knots). This is creating a lot of shear in the Caribbean.

However, looking at the GFS, its shows 500mb winds increasing above 20kts across the Caribbean at 120 hrs (5 days). This could be a sign of the Caribbean starting to become more favorable for tropical cyclones.
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Re: Long Range Models

#348 Postby gatorcane » Wed Jul 30, 2008 4:10 pm

:uarrow: :uarrow:

Cycloneye, indeed I fully expect the GFS to show some phantom (and potentially real but mostly phantom) systems in the long-range as we approach the real start of the Cape Verde season (Aug. 15). We just need to monitor the MDR especially starting in mid August where things could crank up quite a bit.
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Ed Mahmoud

Re: Long Range Models

#349 Postby Ed Mahmoud » Wed Jul 30, 2008 4:39 pm

njweather wrote:00Z EURO, 120hrs

Image

Seems to forecast a fairly large Low in the Caribbean...



That area of yellow on the coast of South America is a pretty frequent feature, it shows strong low level Easterlies in the Southern Caribbean due to the Equatorial heat low. It is usually an inhibiting factor. Soon, however, as we get into late Summer and then Autumn, the water will warm in relation to land, and the continental heat low will weaken, making that part of the Caribbean less hostile to TC development.
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Re: Long Range Models

#350 Postby njweather » Wed Jul 30, 2008 6:23 pm

Ed Mahmoud wrote:
That area of yellow on the coast of South America is a pretty frequent feature, it shows strong low level Easterlies in the Southern Caribbean due to the Equatorial heat low. It is usually an inhibiting factor. Soon, however, as we get into late Summer and then Autumn, the water will warm in relation to land, and the continental heat low will weaken, making that part of the Caribbean less hostile to TC development.


Ah... Thanks for the explanation!
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My interpretation for what's out there now

#351 Postby physicx07 » Thu Jul 31, 2008 3:12 am

My humble interpretation:

There's that disturbance over the Cape Verde Islands moving westward. The water ahead of this is too cool for significant development, and there is also some dry Saharan air in it's general environment:

http://cimss.ssec.wisc.edu/tropic/real- ... 8split.jpg

The models don't want to develop anything out of this in the long term at this point. I don't want to dismiss this system yet and want to see if it can maintain and what it will be like as it approaches the Leewards. Normally something developing this relatively far north at this point in the summer, I'd expect to move more north towards the open Atlantic and be a fish were it to develop. The models though are showing a huge belt of high pressure on the northern edge of the tropics virtually across the entire Atlantic for the next week or so. That would keep things on a westward track across the Atlantic from the west coast of Africa to the Caribbean. So if this disturbance maintains some semblance of identity for a week or so (which the models don't do at all, but things sometimes do), it will be interesting to see what happens when it gets close to the Leeward Islands. I'm going to watch this over the next several days. I think there will be something to watch for longer than the models indicate.

There's a less organized disturbance over the Leeward Islands now. At this point, the models seem to completely wash it out as it moves west-northwest through the Puerto Rico and Hispaniola area over the next few days. In this case, experience of watching these doesn't help me figure out if the depiction of the wave going poof is right or not, so it's a wait and see. It is not a troublesome looking disturbance to me at this point. I don't see any reason to disbelieve the models.

Early next week it looks like a wave or possibly a tropical low may develop over the northern Gulf of Mex and move westward. It looks at this point like it will be very close to the gulf coast and basically bring rain first to Florida on Monday and towards Louisiana and Texas Wed/Thurs. No signif. development seen but it's worth watching, especially if it ends up developing farther to the south more towards the central gulf. This one looks like it would move west until it reaches the Texas waters when it would then veer more towards the northwest. It's always suspect to me seeing a tropical low develop in the models when there's currently nothing but the future models and trends will be worth watching. It doesn't look threatening at this point (nothing out there over the entire basin really does right now).

So to sum it up:

Want to watch that east-Atlantic disturbance through early next week to see if it maintains something, and the possible gulf disturbance possibly developing early next week. The gulf disturbance happening would have implications for the northern gulf for at least rain along the southern gulf states, and ultimately more impact in Texas if it happens more in the central gulf. And if it actually comes to fruition, particularly farther south than models show now, Texas would be under the gun towards late next workweek, but that's a big IF right now.

I'm almost ready to drop the wave currently over the Leewards completely off my radar.

What do you all think of these features?
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#352 Postby gatorcane » Fri Aug 01, 2008 11:49 am

GFS still showing the low at 384 hours:

Image
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#353 Postby 'CaneFreak » Sat Aug 02, 2008 12:00 pm

Boy the 12Z GFS is really off its rocker today. Check this out at 384 hours.

http://www.nco.ncep.noaa.gov/pmb/nwprod ... _384.shtml

HMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM......Do I smell an African wave train? I believe so.....
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#354 Postby KWT » Sat Aug 02, 2008 12:09 pm

Yep that sure does look like a train of CV systems coming across the Atlantic, interesting to see if that comes close!
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Re:

#355 Postby SouthFloridawx » Sat Aug 02, 2008 2:23 pm

'CaneFreak wrote:Boy the 12Z GFS is really off its rocker today. Check this out at 384 hours.
http://www.nco.ncep.noaa.gov/pmb/nwprod ... _384.shtml
HMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM......Do I smell an African wave train? I believe so.....


Sounds like a super cool fun ride on a hot summer day.
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Re: Long Range Models

#356 Postby blp » Sat Aug 02, 2008 2:48 pm

Wow! Thank goodness it is still in Fantasyland.

Image

However, the GFS has been consistent on a low off africa in about 84hrs. This low ends up being a storm off the carolinas in the fantasy run.

Image
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#357 Postby RL3AO » Sat Aug 02, 2008 5:05 pm

Look at the mess the GFS has in the Eastern Atlantic in 84hrs.

http://www.nco.ncep.noaa.gov/pmb/nwprod/analysis/carib/gfs/18/images/gfs_ten_084l.gif
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Re: Long Range Models

#358 Postby jimvb » Sat Aug 02, 2008 10:44 pm

And KWT, look at 384 hours of the 2008 Aug 2 18Z run. You talk about a train of CVs on the 12Z run. This way out 2008 Aug 2 18Z at 384 hours shows a train of four storms, stretching all the way from Florida to Africa. Chugga chugga whoo whoo...

http://www.nco.ncep.noaa.gov/pmb/nwprod/analysis/carib/gfs/18/images/gfs_pcp_384s.gif

And this one closer to the present, 99L I think it's called, seems to be threatening to become a tropical storm in the Gulf. That's going to cause oil prices to shoot upward like fireworks, no matter how much damage it will eventually do.
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Mecklenburg

Re: Long Range Models

#359 Postby Mecklenburg » Mon Aug 04, 2008 11:02 am

what do the models say for next week?
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Re: Long Range Models

#360 Postby alienstorm » Mon Aug 04, 2008 11:20 am

12Z GFS ---- No development anywhere in the Atlantic, Carribean or Gulf of Mexico....
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