Dr. Jeff Masters' WunderBlog

Little change to 90L
Posted by: Dr. Jeff Masters, 01:33 PM GMT del 25 Maggio 2010 +2
The extratropical low pressure system (90L) approaching North Carolina has weakened some over the past 24 hours, and has a much reduced chance of developing into a subtropical storm. The National Hurricane Center (NHC) is giving 90L a less than 20% chance of developing into a depression or tropical/subtropical storm, and anticipates not writing any more special advisories on it. Last night's ASCAT pass saw a large area of 35 mph winds to the north and east of the center, and buoy 41048 to northeast of 90L's center was seeing sustained E winds of 31 mph, gusting to 36 mph this morning. Bermuda radar showing an area of moderate to heavy rain has now moved north of the island, and seas are running 10 - 15 feet in the outer waters of Bermuda today.


Figure 1. Visible satellite image of 90L and the Central American disturbance this morning.

Strong upper-levels winds out of the west are creating about 20 knots of wind shear over 90L, and the shear has been gradually decreasing over the past day. Visible satellite loops show that 90L has a well-defined surface circulation. The main thunderstorm activity is in a large curved band to the north and northeast of the center. This band is several hundred miles removed from the center, which is characteristic of subtropical storms. Sea surface temperatures are near 24°C today and will remain in the 23 - 24°C range the next two days. These relatively cool SSTs have hampered formation of much heavy thunderstorm activity, as has the presence of a large area of dry air to the west, as seen on water vapor satellite loops .

The system will move slowly towards the Southeast U.S. coast today, making its closest approach to the coast on Wednesday, when most of the models indicate the center will be 300 - 500 miles southeast of Cape Hatteras, North Carolina. All of the major models currently predict that 90L will not make landfall, but will move slowly eastward out to sea on Thursday, when a trough of low pressure moving across the Eastern U.S. picks up the storm. There presently isn't much to be concerned with about this storm, though Bermuda may get more heavy rain and high seas from the storm late this week as it moves out to sea. Wunderbloggers Weather456 and StormW have more on 90L.

Central American disturbance
An area of disturbed weather has developed just off the Pacific coast of Guatemala. The disturbance will move inland over Central America during the last half of the week, potentially bringing flooding rains to portions of Guatemala, El Salvador, Honduras, and Nicaragua. There is the potential for the disturbance to push into the Western Caribbean late this week and pose a threat to develop into a tropical depression. While there is high wind shear over the northern Caribbean, shear should be low enough to allow development should the disturbance stay in the southern reaches of the Caribbean. Any storm that develops in the Caribbean in the coming week would get steered to the northeast and will not pose a threat to the Gulf of Mexico.

Tornadoes rip through the Plains
The Storm Prediction Center logged 17 reports of tornadoes yesterday, with twisters reported in South Dakota, North Dakota, Nebraska, Oklahoma, and Texas. In addition, there were 158 hail reports and 126 reports of damaging winds. Fortunately, there were no deaths or injuries reported, and it was a good day for the Vortex2 tornado field research project. Former wunderblogger Mike Theiss caught up with a very picturesque tornado near Faith, South Dakota, and has posted some spectacular video of the tornado.


Figure 2. Large tornado near Faith, South Dakota on May 24, 2010 just misses hitting a church. Image credit: Mike Theiss, ultimatechase.com. Check out his spectacular video of the tornado.

I'll be back later today to discuss how a hurricane might affect the oil in the Gulf of Mexico.

Jeff Masters
Categories: Hurricane
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401. pottery 07:36 PM GMT del 25 Maggio 2010    
Good Afternoon all (this means "hello") LOL
Some decent rains here today about 1/2", from a TW passing through.

90L still out there in limbo?? Time to bury that one ...

The oil-spill news is badder and badder every day. Well, it would be would'nt it, with more and more oil being added every minute.
Looking forward the blog tomorrow which will be about how a Hurricane might affect the situation there.
I would imagine that the oil-filled sea-spray would result in an environmental hazard of vast proportions.

Words fail me, when I see the situation along the Coast........
Member Since: Ottobre 24, 2005 Posts: 0 Comments: 20708
402. nrtiwlnvragn 07:36 PM GMT del 25 Maggio 2010    
Quoting Drakoen:
Upper level winds and sea-surface temperatures should be conducive for development per the SHIPS text in the Caribbean.


Its got some decent Heat Content on the Pacific side also.

Edit: Add

Prob of RI for 25 kt RI threshold= 76% is 6.6 times the sample mean(11.5%)
Prob of RI for 30 kt RI threshold= 42% is 5.5 times the sample mean( 7.7%)
Prob of RI for 35 kt RI threshold= 28% is 5.5 times the sample mean( 5.2%)
Member Since: Settembre 23, 2005 Posts: 11 Comments: 8938
403. Cavin Rawlins 07:36 PM GMT del 25 Maggio 2010    
Quoting CycloneOz:


Aye, aye...cyclone right ahead.


It does bode well for parts of Central America that are under flood and landslide risk already from previous days of rain.
Member Since: Luglio 24, 2005 Posts: 407 Comments: 19076
404. SouthALWX 07:37 PM GMT del 25 Maggio 2010    
Quoting nrtiwlnvragn:


I don't have a problem with being wrong on a forecast, anyone who tries to predict weather is going to be wrong at times. Its the other stuff that is added, that I feel is unnecessary.

On another note it has crossed my mind that the upgrade to the ECMWF may be causing it to be overagressive, but its only been one storm and I can remember in the past when it was also overagressive. So no real validity to it at this time, just a thought.

I keep reminding people of the ECMWTF years but it seems to have slipped many minds the past little while. GFS is bad about ghost storms ... ECM picks up well on genesis but has been bad about over intensifying in the past. CMC is just tropical crack .. keeps us goin' when everything else is boring and we need a something for the addiction =P
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406. Beachfoxx 07:38 PM GMT del 25 Maggio 2010    
Pottery,

Ditto Post 401....

Words fail me, when I see the situation along the Coast........
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407. mgreen91 07:39 PM GMT del 25 Maggio 2010    
Tropical Storm Risk Forecasts Active 2010 Hurricane Season

Tropical Storm Risk (TSR) provides "real-time mapping and prediction of tropical cyclone wind fields worldwide." The firm is co-sponsored by Aon Benfield, with RSA and Crawford & Company. It has just released a "pre-season outlook report to coincide with the start of the 2010 Atlantic hurricane season."

The timing was eerily prescient, as the first tropical depression of the season has formed in the Atlantic of the eastern coast of the U.S. [See IJ web site - http://www.insurancejournal.com/news/national/2010/05/25/110138.htm]. TSR's report anticipates "Atlantic basin and U.S. land falling hurricane activity being 55 percent above the long-term (1950-2009) norm."

TSR is part of Aon Benfield Research's new academic and industry collaboration. It maintains its April and December forecasts for an active hurricane season. The bulletin noted that the pre-season outlook includes the following:
-- A 77 percent probability of an above-normal Atlantic hurricane season; an 18 percent probability of a near-normal season, and only a 5 percent chance of a below-normal season.
-- 16 tropical storms including eight hurricanes and four intense hurricanes. This compares to long-term norms of 10, six and three respectively.
For U.S. land falling activity, TSR forecasts:
-- A 74 percent probability of above-normal U.S. land falling hurricane activity; a 19 percent likelihood of a near-normal season, and only a 7 percent chance of a below-normal season.
-- Five tropical storm strikes on the U.S., including two hurricanes. This compares to long-term norms of three and 1.5 respectively.

The bulletin also explained that three main climate factors will determine the level of hurricane activity in the Atlantic basin. Occurring in August and September, these are "the speed of trade winds over the tropical North Atlantic, sea temperatures in the tropical North Atlantic, and the sign and strength of El Niño Southern Oscillation. U.S. land falling hurricane activity is influenced by the level of hurricane activity occurring at sea, the pre-season North Atlantic Oscillation, and by July tropospheric wind patterns over the North Atlantic and U.S."

Professor Mark Saunders at Tropical Storm Risk, indicated: "Every main climate indicator points to the 2010 hurricane season being active. If La Niña develops during the second half of 2010 the above-norm hurricane levels will be even higher."

John Moore, Head of International Analytics at Aon Benfield, added: "Although uncertainty remains within hurricane forecasts, the insurance industry is increasingly informed by this data source when considering how best to manage its exposure to this risk."

According to Steve Drews, associate director and lead meteorologist at Impact Forecasting, the catastrophe model development center of excellence within Aon Benfield, "TSR's pre-season outlooks correctly anticipated the active 2004, 2005 and 2008 hurricane seasons and the quiet 2009 season. 2004's hurricanes barraged Florida, 2005's hurricanes Katrina, Rita and Wilma slammed the Louisiana, Mississippi, Alabama and Florida coastlines, and 2008's hurricane Ike affected the major Texas coastal cities of Galveston and Houston."

TSR's next hurricane forecast will be issued on 4 June. Professor Mark Saunders will also be updating the forecast for the 2010 hurricane season and revealing new technology to help (re)insurers manage tropical storm-related risks at Aon Benfield Research's event: The science behind hurricanes, earthquakes and other natural perils in London on 15 June.

TSRs Pre-Season Hurricane Forecast Report is available at: http://www.aon.com/attachments/reinsurance/201005_tsr_forecast_report.pdf .

Source: Aon Benfield



Read more: http://www.insurancejournal.com/news/international/2010/05/25/110165.htm#ixzz0oyJkvU30
Member Since: Agosto 4, 2006 Posts: 0 Comments: 290
409. WatchingThisOne 07:39 PM GMT del 25 Maggio 2010    
Just like the large financial firms more or less own their regulators, we are now seeing clear evidence (and it's been around for a while) of

Regulatory capture by the oil industry

"friends since childhood" ... lovely

Member Since: Luglio 15, 2005 Posts: 3 Comments: 1249
410. Hurricanes101 07:40 PM GMT del 25 Maggio 2010    
cyclone that isnt 10 days away

we are talking about 5 days
Member Since: Marzo 10, 2010 Posts: 1 Comments: 6902
411. CybrTeddy 07:40 PM GMT del 25 Maggio 2010    
90L unlikely to amount to anything, Caribbean looks promising. 5/25/10

Sorry for the quick update, on the run. Comments are welcomed! :-)
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412. Drakoen 07:40 PM GMT del 25 Maggio 2010    
You can see the curved band west of Costa Rica hooking into the circulation:

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413. nrtiwlnvragn 07:41 PM GMT del 25 Maggio 2010    
Quoting SouthALWX:

I keep reminding people of the ECMWTF years but it seems to have slipped many minds the past little while. GFS is bad about ghost storms ... ECM picks up well on genesis but has been bad about over intensifying in the past. CMC is just tropical crack .. keeps us goin' when everything else is boring and we need a something for the addiction =P


After its upgrade last year the CMC performed better, but last year was a difficult year for most models with all the shear. If predictions of an overly active year come true this year, it may be a better test of the CMC, along with the upgraded UKMET and scheduled upgraded GFS.
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414. TheCname 07:41 PM GMT del 25 Maggio 2010    
If 90E becomes Agatha will it keep the same name or turn into Alex when it cross over to the Atlantic side?
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415. xcool 07:42 PM GMT del 25 Maggio 2010    
about time something to track .........
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416. Cavin Rawlins 07:43 PM GMT del 25 Maggio 2010    
The timing was eerily prescient, as the first tropical depression of the season has formed in the Atlantic of the eastern coast of the U.S. [See IJ web site - http://www.insurancejournal.com/news/national/2010/05/25/110138.htm]. TSR's report anticipates "Atlantic basin and U.S. land falling hurricane activity being 55 percent above the long-term (1950-2009) norm."

lol
Member Since: Luglio 24, 2005 Posts: 407 Comments: 19076
418. GTcooliebai 07:43 PM GMT del 25 Maggio 2010    
Quoting TheCname:
If 90E becomes Agatha will it keep the same name or turn into Alex when it cross over to the Atlantic side?

It will be renamed Alex
Member Since: Agosto 31, 2009 Posts: 0 Comments: 5191
419. alexhurricane1991 07:43 PM GMT del 25 Maggio 2010    
Quoting TheCname:
If 90E becomes Agatha will it keep the same name or turn into Alex when it cross over to the Atlantic side?
It well become Alex
Member Since: Aprile 8, 2010 Posts: 15 Comments: 2543
420. taco2me61 07:44 PM GMT del 25 Maggio 2010    
Hey All,

Well I'm in Pampa TX and will be ready to chase a storm to our south west.... Can anyone on here might give us a better location it sure would be very helpful


Thanks
Taco :o)
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421. Hurricanes101 07:44 PM GMT del 25 Maggio 2010    
Quoting TheCname:
If 90E becomes Agatha will it keep the same name or turn into Alex when it cross over to the Atlantic side?


Quoting Weather456:
The timing was eerily prescient, as the first tropical depression of the season has formed in the Atlantic of the eastern coast of the U.S. [See IJ web site - http://www.insurancejournal.com/news/national/2010/05/25/110138.htm]. TSR's report anticipates "Atlantic basin and U.S. land falling hurricane activity being 55 percent above the long-term (1950-2009) norm."

lol


Someone forgot to tell them lol
Member Since: Marzo 10, 2010 Posts: 1 Comments: 6902
422. catastropheadjuster 07:44 PM GMT del 25 Maggio 2010    
Quoting Floodman:


Darlin', that oil soaker stuff is actually clay cat litter; won't work in water


Oh see I said i probably didn't know what i was talking about. Thank you Floodman. How r ya? I sure have missed evy1.
Sheri
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423. xcool 07:45 PM GMT del 25 Maggio 2010    
TheCname // well get new name
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424. Drakoen 07:45 PM GMT del 25 Maggio 2010    
Quoting TheCname:
If 90E becomes Agatha will it keep the same name or turn into Alex when it cross over to the Atlantic side?


http://www.aoml.noaa.gov/hrd/tcfaq/B5.html

If it maintains itself as a named cyclone it will not be renamed.
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426. taco2me61 07:45 PM GMT del 25 Maggio 2010    
just wondering if OZ is still on????

Taco :o)
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427. nrtiwlnvragn 07:46 PM GMT del 25 Maggio 2010    
Quoting TheCname:
If 90E becomes Agatha will it keep the same name or turn into Alex when it cross over to the Atlantic side?


The following rules apply for tropical cyclones passing from one basin to another: Retain the name if a tropical cyclone passes from one basin into another basin as a tropical cyclone; i.e., advisories are continuous. An unnamed tropical depression will also retain its number (e.g. Tropical Depression Six-E remains Tropical Depression Six-E) if it crosses into another area of responsibility. For unnamed tropical depressions moving from west to east across 180°, CPHC will use the associated Joint Typhoon Warning Center’s (JTWC) number and indicate JTWC in parentheses following the number. For named systems, CPHC will use the associated RSMC Tokyo name and provide the associated JTWC number in parentheses.
Within a basin, if the remnant of a tropical cyclone redevelops into a tropical cyclone, it is assigned its original number or name. If the remnants of a former tropical cyclone regenerate in a new basin, the regenerated tropical cyclone will be given a new designation.


National Hurricane Operations Plan, Chapter 3
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428. all4hurricanes 07:46 PM GMT del 25 Maggio 2010    

SHIPS is calling for near hurricane strength
anyone up for a repeat of Alma/Arthur?
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429. cg2916 07:46 PM GMT del 25 Maggio 2010    
Hey, 456, what odds do you give 90L of forming?
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430. xcool 07:47 PM GMT del 25 Maggio 2010    
FIU2010 hey
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432. xcool 07:47 PM GMT del 25 Maggio 2010    
alexhurricane1991 heyyyyyyyy
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434. IKE 07:48 PM GMT del 25 Maggio 2010    
Quoting FIU2010:
G'afternoon, all; long time lurker, here. How's everyone doing?


Greetings.

Hate to be quick to ask...but....are you JFV?
Member Since: Giugno 9, 2005 Posts: 23 Comments: 37044
437. Levi32 07:48 PM GMT del 25 Maggio 2010    
Quoting cg2916:
Hey, 456, what odds do you give 90L of forming?
Quoting FIU2010:
90L in the East Pac looks promising, guys.


It's 90E...."E" for East Pacific. 90L is in the Atlantic.
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438. NRAamy 07:49 PM GMT del 25 Maggio 2010    
Greetings.

Hate to be quick to ask...but....are you JFV?



hahahahahahaha!

;)
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440. taco2me61 07:49 PM GMT del 25 Maggio 2010    
OK from The NWS out of AMarillo TX keeps saying that the Pandhandle and western Oklahoma will have very server weather the next 2 days. So looks like a prime location for chasing Tornados..... We will see...

Taco :o)
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441. xcool 07:49 PM GMT del 25 Maggio 2010    
good.and lazy today
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442. IKE 07:49 PM GMT del 25 Maggio 2010    
Day 7 HPC shows a Caribbean low....

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443. xcool 07:50 PM GMT del 25 Maggio 2010    
haha ike
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444. WatchingThisOne 07:50 PM GMT del 25 Maggio 2010    
Quoting SouthALWX:

I keep reminding people of the ECMWTF years but it seems to have slipped many minds the past little while. GFS is bad about ghost storms ... ECM picks up well on genesis but has been bad about over intensifying in the past. CMC is just tropical crack .. keeps us goin' when everything else is boring and we need a something for the addiction =P


Ghost storms I don't care about, especially 5 days out. In terms of actual storms, last year the GFS and ECMWF models did best up to 48 hours out, with the CMC in spitting range of those two. 5 days out, the CMC performed best.

How the models did in 2009 season
Member Since: Luglio 15, 2005 Posts: 3 Comments: 1249
445. IKE 07:50 PM GMT del 25 Maggio 2010    
Quoting FIU2010:
Hi Ike, no, I'm not that infamous JFV blogger.


Okay. Welcome.
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447. Drakoen 07:51 PM GMT del 25 Maggio 2010    
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448. WatchingThisOne 07:51 PM GMT del 25 Maggio 2010    
On the models, I should clarify that is regarding TRACK of the storms.

WTO
Member Since: Luglio 15, 2005 Posts: 3 Comments: 1249
449. extreme236 07:51 PM GMT del 25 Maggio 2010    
Quoting IKE:


Greetings.

Hate to be quick to ask...but....are you JFV?


Oh god I don't even want to think about the possibility of him being back on here for this season.
Member Since: Agosto 2, 2007 Posts: 19 Comments: 19234
451. IKE 07:52 PM GMT del 25 Maggio 2010    
Quoting extreme236:


Oh god I don't even want to think about the possibility of him being back on here for this season.


He will be...until he gets banned.

EDIT>>>I didn't say I didn't like JFV, but he can't survive admin.
Member Since: Giugno 9, 2005 Posts: 23 Comments: 37044

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About JeffMasters
Jeff co-founded the Weather Underground in 1995 while working on his Ph.D. He flew with the NOAA Hurricane Hunters from 1986-1990.

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