Tropical wave bringing heavy rain to northern Lesser Antilles
A tropical wave near 18N, 60W is entering the northernmost Lesser Antilles Islands and is generating some disorganized heavy thunderstorm activity. This wave is under about 20 knots of wind shear, due to strong upper-level westerly winds. The strong upper-level winds are associated with the counter-clockwise flow of air around an upper-level cold-cored low pressure system a few hundred miles north of Puerto Rico. As the wave progresses west to west-northwest through Tuesday, thunderstorm activity will increase, due to interaction with the upper low. The rains from these thunderstorms will bring the threat of flooding to Puerto Rico on Monday, the Dominican Republic on Tuesday, and Haiti on Wednesday. The upper low will also bring high wind shear of 20 - 30 knots over the the wave on Monday and Tuesday. No development of the wave is likely until at least Thursday, when it will be over the eastern Bahamas and eastern Cuba. At that time, shear is expected to drop below 20 knots, and the wave has the potential to develop. However, none of the reliable computer models is calling for tropical cyclone development over the next seven days. I expect that this wave will eventually enter the Gulf of Mexico early next week. NHC is giving the wave a 10% chance of developing into a tropical depression by Tuesday.

Figure 1. Morning satellite image of tropical wave entering the Lesser Antilles Islands.
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Jeff Masters
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most pine tree trunks have more curvature than me, hahahaha
97L to the gulf in some sorta sheared ripped-up form. More problems for development around western cuba. After that, all bets are off on development...and ending up somewhere between the LA, TX/MX border.
ya'll have a good one.
Check out the track of this killer after it crosses the Great Lakes...
Wow. That's SE Bahamas.... very near Ike's track in 08.
+1 Me too.
I made that point this morning; was surprised to see some apparent rotation in the convection even though it is way below the normal 10N where coreolis kicks in....Hard to tell at the moment whether this feature will break away from the ITCZ and rise in latitude over the next several days, or, fizzle out as Beell has noted as it moves west.
Ok thanks, that's interesting.
At any rate development should be slow until then.
23.47353236275745%
lol, come on do you really think any of us can answer that question?
by the looks of the models pretty good
NOUS42 KNHC 191300
WEATHER RECONNAISSANCE FLIGHTS
CARCAH, NATIONAL HURRICANE CENTER, MIAMI, FL.
0900 AM EDT MON 19 JULY 2010
SUBJECT: TROPICAL CYCLONE PLAN OF THE DAY (TCPOD)
VALID 20/1100Z TO 21/1100Z JULY 2010
TCPOD NUMBER.....10-049
I. ATLANTIC REQUIREMENTS
1. NEGATIVE RECONNAISSANCE REQUIREMENTS.
2. SUCCEEDING DAY OUTLOOK: POSSIBLE LOW LEVEL
INVEST NEAR 21.0N 73.5W AT 21/1800Z. BEGIN
6-HRLY FIXES AT 22/0600Z IF SYSTEM DEVELOPS.
LOL I wasn't looking for a specific #. I was looking for opinions and possibly historical data.
INVEST NEAR 21.0N 73.5W AT 21/1800Z. BEGIN
Looks like they canceled the one for Tuesday and have one set Wednesday in the SE Bahamas.
based on current forecast tracks the chances of 97L affecting TX/MX is possible
but this is so far out, a lot can change; just keep an eye on it for now
So much for downward MJO.. wow.
the one for tomorrow is not cancelled, or else it would have said so in that same text
Geez. I hate the model runs that bring the core of the storm up over New Providence from the South.... about the worst possible approach direction for us...
LOL... some of us have been looking at this since when it came off W Africa w/ a low analysed at 20N and vigorous shower activity at 10N... have to admit it was the first one that looked like it had a chance against all the conditions. OTOH, I'm not surprised the one in front of it is kicking up some water, since it was the one that cleared out a lot of the SAL and moisturized a lot of the CATL....
I've been thinking about this too. I've also been wondering if a serious strengthening between 75 adn 80 west might not result in a more northerly movement, thereby separating the two systems more.
Yeah, we were talking about that aspect of Katrina's cyclogenesis yesterday or Saturday. Rita is another storm from that year that organized relatively quickly (though not as fast as Katrina IIRC) in a similar location.
The wave came off yesterday with impressive circulation and convection. The Dust from the SAL has stopped the convection of the northern section over the Cape Verdes where the circulation is. There is still convection to the south at about 8N 25W the. These two features bear watching. 97L the current invest was the same situation. It came all the way across the atlantic as a naked circulation and is now firing convection since it is out of the dust.
The convection to the south is interesting because it is interacting with a trough in the South Atlantic. There has been some shearing to the south as well as convergence from the south.
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