About Jeff Masters
Cat 6 lead authors: WU cofounder Dr. Jeff Masters (right), who flew w/NOAA Hurricane Hunters 1986-1990, & WU meteorologist Bob Henson, @bhensonweather
By: Dr. Jeff Masters , 2:40 PM GMT on August 15, 2013
The tropical wave in the Western Caribbean near the Yucatan Peninsula (92L) is growing more organized this morning, after an evening when it lost most of its heavy thunderstorm activity. Satellite loops show a modest-sized area of heavy thunderstorms that are increasing in intensity and areal coverage, but there are a no signs of a surface circulation. Winds at surface stations in the Western Caribbean also do not show a surface circulation. The highest surface wind reports this Thursday morning were at Western Caribbean buoy 42056 about 140 miles east southeast of Cozumel, which had east winds of 25 mph, gusting to 34 mph, at 10 am EDT. Wind shear is a moderate 10 - 20 knots over the the wave, which should allow slow development today until its west-northwest movement at 10 - 15 mph carries it over the Yucatan Peninsula Thursday afternoon. Four hurricane hunter flights were scheduled to fly into 92L today--an Air Force mission tasked to provide a center fix early this afternoon, two NOAA P-3 missions aimed at collecting real-time radar data to feed into the HWRF model, and a flight by the NOAA jet to collect dropsonde data around the periphery of 92L. However, all of these flights were cancelled, given that 92L did not organize as much as much as it could have.
Figure 1. MODIS satellite image of Invest 92L taken at 12:30 pm EDT Thursday August 15, 2013. Image credit: NASA.
Forecast for 92L
92L will trek across the Yucatan Peninsula Thursday evening and arrive in the Southern Gulf of Mexico on Friday, when it will have the opportunity to strengthen. The 06Z Thursday SHIPS model forecast predicts that 92L will remain in an area of low to moderate wind shear through Saturday, and ocean temperatures will be a favorable 29 - 30°C. The topography of the Southern Gulf of Mexico's Bay of Campeche can aid in getting a storm spinning more readily, but 92L may be far enough north that this influence will be negligible. Given all these factors, 92L should be able to become at least a tropical depression by Saturday, A trough of low pressure over the northern Gulf of Mexico will dip down by Saturday evening over the Central Gulf of Mexico, potentially increasing wind shear to a high 20 - 30 knots, stalling any further intensification. This trough may also be able to pull the storm northwards to a landfall between Eastern Louisiana and the Florida Panhandle, as the 00Z Thursday run of the European model is suggesting. This would bring a plenty of tropical moisture into the Southeast U.S., resulting in a large area of 4+" of rain. However, the other models show a more westerly track for 92L, with landfalls possible in Texas or Mexico south of the Texas border, and there is high uncertainty where 92L may go once it enters the Gulf of Mexico. In their 8 am EDT Wednesday Tropical Weather Outlook, NHC gave 92L a 50% of developing by Saturday, and a 60% chance of developing by Tuesday.
Figure 2. MODIS satellite image of Tropical Storm Erin taken at 10:30 am EDT Thursday August 15, 2013. At the time, Erin had maximum sustained winds of 40 mph. Image credit: NASA.
Tropical Storm Erin
The season's fifth named storm of the year, Tropical Storm Erin, has formed over the far Eastern Atlantic off the coast of Africa. Erin is over warm waters of 27°C and is under a moderate 10 - 15 knots of wind shear, which should allow continued development today and Friday. Erin is a small storm, as seen on satellite loops. The 12Z Thursday SHIPS model forecast predicts that wind shear will be low to moderate for the next five days, which favors development. However, the waters beneath Erin will steadily cool to a marginal 26°C by Friday, and the atmosphere will steadily get drier, as the storm encounters the Saharan Air Layer (SAL), discouraging development. Erin's west-northwest motion will cut the storm off on Sunday from a moist source of air to its south--the semi-permanent band of tropical thunderstorms called the ITCZ (Inter-Tropical Convergence Zone.) The storm should weaken beginning on Sunday, which would result in Erin turning more to the west as the east-to-west blowing surface trade winds begin to dominate the steering of the shallower storm. We may see a situation like occurred for Tropical Storm Dorian in late July--intensification to a 60 mph tropical storm, followed by a slow decay and dissipation. The latest run of the GFS model calls for Erin to dissipate well before reaching the Lesser Antilles Islands.
Typhoon Utor dissipates
Typhoon Utor has dissipated after hitting Southeast China about 150 miles southwest of Hong Kong on Wednesday as a Category 1 storm with 90 mph winds. The typhoon is being blamed for 1 death in China, and sank a 21-person cargo ship off the coast. In the Philippines, where Utor hit as a Category 4 storm with 140 mph winds on Monday, 8 deaths are being blamed on the storm, and damage is estimated at $20 million.
Jeff Masters
The views of the author are his/her own and do not necessarily represent the position of The Weather Company or its parent, IBM.
Cat 6 lead authors: WU cofounder Dr. Jeff Masters (right), who flew w/NOAA Hurricane Hunters 1986-1990, & WU meteorologist Bob Henson, @bhensonweather
742. hurricanes2018
741. LAbonbon
**Sigh*** I'm too gullible...
740. Patrap
739. sar2401
First, it's a good idea to buy things before a storm coming. Second, what part of south Louisiana are you in? I can find no warnings of any type being issued by the Louisiana EMA nor any parish EMA. There is also nothing in the news about any panic buying in south Louisiana. I may be wrong, but your post sounds like trolling, and that's a bad thing to do when it's storm season.
738. Gearsts
737. centex
736. LargoFl
735. VR46L
Looks like the next two will be similar well according to the GFS ..
734. LargoFl
733. LAbonbon
I was actually referring to the 'Tropical Development Index' graphic. But I do appreciate the other ones...w/ the exception of that NAM one you posted in the wee hours :)
732. centex
731. MississippiWx
Troll Parish.
730. CaribBoy
Very annoying/depressing/boring pattern if it continues into september
729. Patrap
That poster is just yanking ya chain.
Here in NOLA, its Thursday.
Dat bout covers it.
728. LAbonbon
weatherrx, what parish are you in?
727. CaribBoy
Yes, but PR has been WAYYYYYY wetter than St.Barths/St.Maarten/Anguilla in the N Leewards. So I can understand your opinion.
726. SensesFail
725. LargoFl
724. sar2401
Since it may have been all they had in the world, they probably didn't consider it "crap". I hope I'm never in such a position,
723. WalkingInTheSun
Very nice-sounding evaluation.
722. weatherrx
721. weathermanwannabe
Link
720. SuperStorm093
719. Drakoen
718. MississippiWx
717. CaribBoy
I feel even more frustrated when the rain skirts me... (remember Dorian's remains :s :s)
716. sar2401
I think this is Barry II. Once this "thing" gets back into the Gulf, most of the energy will go left into Mexico. There will be enough leftover convection to give central and south Florida some rain but I can't see any scenario where whatever tropical type storm 92L becomes gets any further east the the TX/MX border. 92L has had plenty of time to get organized and all its done is become a more elongated trough.
715. LargoFl
713. LAbonbon
Hey Largo - a few days back someone posted in respone to this graphic that they weren't really fond of it. I've always liked it, as it seems pretty straightforward to me. But I can't recall the rationale that was posted. Something like it didn't give a complete picture of conditions?...dunno. Do you remember the blogger's thoughts on this?
712. Drakoen
It pretty much formed the one it has now near/on land. We'll see if it can maintain any lower level circulation which is becoming more apparent on visible satellite imagery.
711. Stormchaser2007
710. louisianaboy444
Do you feel like it can keep any circulation in tact while crossing the Yucatan?
709. CaribBoy
XD
708. Drakoen
A couple of westerlies shown
707. centex
706. VR46L
705. CaribBoy
Though 6Z, 12Z and 18Z models have trended north overall....
703. seminolesfan
It is rare to not see his smiling face on our lovely community blog space.
702. daddyjames
Models scream? Wow, that's a first. ;)
701. Skyepony (Mod)
700. CaribBoy
COOL!!
699. CaribBoy
My fingers are crossed.. I'm waiting impatiently
698. RGVtropicalWx13
Yep! Majority of these take this to the southwestern gulf not central gulf. Coordinates for the central gulf are around 25n and 90w give or take. Also shear there in the sw gulf is very favorable atm compared to the central gulf.
697. TexasHurricane05
696. CybrTeddy
Fairly nice structure.
695. hurricanes2018
693. CaribBoy
I was not born yet... but Frederic (1979) sure was an interesting storm in the N Leewards! It was a slow and wet Strong TS/Low Cat 1. 400 mm of rainfall fell in my area during that storm!!
Much more interesting than fast moving sheared busts like Chantal.
692. LargoFl