Hurricane Julia was upgraded to a category 4 hurricane overnight, joining Hurricane Igor, meaning there are two category four storms active in the Atlantic at the same time. Bermuda should continue to monitor Igor very closely. Julia is out to sea, and it's likely anything else coming off from the cape verde this year will recurve.

This means in 2010 that so far there have been 4 major hurricanes, and all of the majors have made it to category four.

Tropical Storm Karl is strengthening as it is making landfall in the Yucatan. The official forecast has it restrengthening in the Bay of Campeche and becoming a hurricane before landfall near or just south of Tampico in Mexico. Those in the area will want to watch it closely.

It's now mid september and focus will be less on the Cape Verde systems, and more on the Caribbean and Gulf and closer Atlantic waters. The most likely spot for development next week will likely be in the Caribbean.

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9:00PM EDT Updated - Tuesday, 14 Sept 2010
Tropical Storm Karl has formed in the Western Caribbean and is forecast to make landfall along the Yucatan peninsula tomorrow as a tropical storm. After which it is forecast to move into land near Tampico in Mexico as a Tropical Storm. Thankfully conditions appear it won't be much more than rainfall.

Igor is still a category 4 hurricane and the forecast track should keep Bermuda watching it closely, the forecast track for it seems fairly good.

Julia should remain well out to sea.

Three storms in the Atlantic, one a threat to Mexico for mostly rainfall, one a potential threat to Bermuda, and another no threat to land at all. None of the systems appear to be a threat to the United States.

3:45PM EDT Updated - Tuesday, 14 Sept 2010
Just a quick update to note that Tropical Storm Karl has formed in the Caribbean as found by Recon.

1:30PM EDT Updated - Tuesday, 14 Sept 2010
As two impressive hurricanes continue spinning far out to sea, a bit of a sneaker of a system which we have been following (Invest 92L) is now developing impressively in the favorable environment of the west-central Caribbean, and if current trends continue, advisories could very easily and quickly be issued for west Caribbean nations and/or their nearby islands later today or tonight. Interests in and around the western Caribbean, including the Yucatan peninsula, may want to start taking some tentative precautions for very heavy rain and stout wind, regardless.

Recon is currently back en route to Invest 92L.

7AM EDT Update - Tuesday, 14 Sept 2010
Igor has weakened a bit overnight, but not all that much, it is still a Category 4 hurricane. The expected turn to the north has begun, and it appears the Leewards will be spared the worst. Igor may get very close to Bermuda, it likely will be weaker near there, but it would still be a formidable hurricane. Those in Bermuda will want to watch very closely over the next several days.

Julia is now a Hurricane, as is already well on it's way to recurving.

The wave in the Caribbean (92L) had a bit too much land interaction and chances have dropped for its development but probably will rebound by the afternoon. It still is fairly likely to form before landfall in the Yucatan.

It is possible for a few more waves off Africa to develop, but recurves are most likely in any of the scenarios for another week or so. As the season goes deeper into the second half, more focus will be shifted westward.

12AM EDT Update - Monday, 13 Sept 2010
At 13/03Z NHC upgraded TD12 to Tropical Storm Julia - the tenth named storm of the season. Julia was located about 110 miles to the southeast of the southern Cape Verde Islands and with movement to the west northwest becoming more northwest at 10mph, a Tropical Storm Warning has been issued for those southern islands. Julia is expected to become a Hurricane on Tuesday. Wih some factors favoring an increase in intensity and increasing windshear and cooler SSTs in a couple of days favoring a decrease in intensity, the intensity forecast beyond Tuesday could see some fluctuations.

Igor is...well, simply an amazing storm with sustained Cat IV winds now at 130 knots and the possibility of 140 knots (Cat V) by 12Z on Monday. Although some erosion has been noted on the southeast core, this could simply be associated with the directional change of the past few hours to slightly south of due west, and there is a pocket of drier air ahead of the system for the next couple of days but its not that significant. Near-term motion to the west and west northwest is anticipated, however, the long term is still a bit uncertain with a few models hinting at a turn back toward the west northwest, i.e., the weakness in the ridge does not fully capture the system. However, at the moment this is still an outlier scenario - but folks in the northern Leeward Islands should closely monitor Igor and wait for the expected turn to the northwest.

Invest 92L is located south of the western tip of Haiti moving slowly to the west northwest and Jamaica can anticipate heavy rain squalls on Monday. The system is very disorganized and shows no sign of near-term development.
ED

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7:00PM EDT Update Sunday, 12 September 2010
Hurricane Igor has strengthened into a Category 4 hurricane today, and may strengthen a bit more before weakening. Odds continue to favor it recuring before nearing land, but it will have to be monitored to see if anything changes.

The wave in the Caribbean (92L) is bringing some rainfall into Haiti now, if it develops it won't be for another day or so.

9:00AM EDT Update Sunday, 12 September 2010
Hurricane Igor continues to look impressive on Satellite and is moving generally westward at about 18MPH. The current forecast track keeps the cone northeast of the Leeward islands, but those there should continue to watch until the northward movement verifies. Odds currently favor Igor recurving before the Islands. Beyond that, odds favor recurve before reaching the us, but trends may move it westward, and another "Earl-Like" situation could develop. However, odds are it will stay offshore.

The wave in the Central Caribbean (92l) stil has a 50/50 shot of development over the next two days, it becomes more likely as it nears the western Caribbean. Once there those in the Yucatan, and westward into Southern Mexico will want to watch it.

The system off Africa, 93L, has formed into Tropical Depression 12, and advisories will likely start at 11AM EDT this morning. Odds are extremely high this too will recurve out to sea.

8:30AM EDT Update Saturday, 11 September 2010
This morning there is Tropical Storm #Igor, now on the verge of becoming a hurricane. Igor's odds still favor out to sea currently, but the Leeward islands will want to watch since they are in the cone. It would approach the islands until Thursday or Friday if it did.

The wave in the Caribbean (92L) still has a shot to develop before the end of the weekend (60% now), so those in Jamaica, Caymans, CUba, and the Yucatan Peninsula including Belize will want to continue watching it. Odds favor it remaining generally west and south so it may be a threat for other parts of Mexico later as well.

93L is a wave that has just come off the coast of Africa, and already has a good pattern to allow it for development into a tropical depression or storm, odds favor this going out to sea as well, but there are several opportunities where that could change. It currently has a 30% chance to develop within the next two days.

6PM EDT Update Friday, 10 September 2010
Not too much has changed since yesterday on Igor and 92L. Igor has regained some strength and has a good shot to become a major later on, but still looks like odds favor it staying out to sea. Still a lot of time for things to change, however.

92L is about a 50/50 for development over the weekend, and it's still is worth watching for Western Caribbean Islands and the Yucatan, and odds favor it staying south, but again it's worth watching for changes.

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Flhurricane recording of French Atilles Radar for 92L

7AM EDT Update Thursday, 9 September 2010
Igor is not moving, and at this far out in the Atlantic it's likely to cause a very long delay before it heads more west, it has remained weak as well. The official forecast keeps it still in the Central Atlantic into the middle of next week. Odds strongly favor the system staying out to sea once past the Cape Verde, and it may become a major hurricane while doing so.

Outside of this, Ex-Gaston is over Hispaniola and is causing rains in Haiti, but does not look to develop anytime soon. Another area in the Leeward islands may have to be watched as it moves westward, but for now it's not an official "Invest" area. (Update: Just minutes after this was written, 92L gets designated) This system has a good shot for development when this system arrives in the western Caribbean, and is probably the most worthy of being watched of all the areas (For affects to land. m Highest chances currently are for western Caribbean islands (Caymans/Jamaica/Cuba), Belize, Yucatan, and Mexico westward). Although for track it is still a developing system, so things can change.

If it were to develop, Saturday/Sunday seems to be most likely.

Over Africa another wave may emerge that could develop, but that also is trending toward a recurve.

In short, one storm that looks to recurve, and a few unlikely areas that need to be watched for development later is pretty good news for the peak of the season. However, this is also the time to watch for surprises (like Hermine).

Original Update
Tropical Storm Warnings are up for the Cape Verde islands off Africa as Tropical Storm Igor forms in the Eastern Atlantic.

It is forecast to move westward and strengthen into a hurricane. Odds slightly favor Igor staying out to sea, but long range uncertainties make it worth watching through the week into next.

This is going to take a while to cross the Atlantic-- any affects on the Caribbean islands would not be seen until late next week.

More to come later.