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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1601. xcool 05:30 AM GMT del 26 Maggio 2010    
TampaSpin YEAH works
Member Since: Settembre 26, 2009 Posts: 2 Comments: 15503
1602. scott39 05:31 AM GMT del 26 Maggio 2010    
Quoting KoritheMan:


All indications are that it will, yes.
The reason i ask is because the models earlier today had it more ENE and now they have backed off farther W and turning farther N.
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1603. KoritheMan 05:41 AM GMT del 26 Maggio 2010    
Quoting scott39:
The reason i ask is because the models earlier today had it more ENE and now they have backed off farther W and turning farther N.


I think that's an unrealistic scenario, because I think the trough that will absorb 90L is strong enough, and extends far enough southward to keep 90E/Agatha out of the Gulf of Mexico.

Now, if the models persist in that prediction...
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1604. TampaSpin 05:48 AM GMT del 26 Maggio 2010    
Quoting xcool:
TampaSpin YEAH works
3

Go to the blog area
Member Since: Settembre 2, 2007 Posts: 175 Comments: 19747
1606. scott39 05:52 AM GMT del 26 Maggio 2010    
90E looks like its getting act together. IMO
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1608. alexhurricane1991 05:53 AM GMT del 26 Maggio 2010    
Quoting FIU2010:



hmmmmm
What are you thinking?
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1609. scott39 05:56 AM GMT del 26 Maggio 2010    
When is the trough suppose to absorb 90E? How many days?
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1611. xcool 05:59 AM GMT del 26 Maggio 2010    


so NGP AND CMC

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1612. alexhurricane1991 05:59 AM GMT del 26 Maggio 2010    
Quoting FIU2010:
about a distinctive possibility regarding 90E.
What the possibility your thinking about?
Member Since: Aprile 8, 2010 Posts: 15 Comments: 2543
1613. KoritheMan 06:00 AM GMT del 26 Maggio 2010    
Quoting scott39:
90E looks like its getting act together. IMO


Convection displaced to the west of the vorticity maximum, due to easterly shear induced by a developing anticyclone to the east:

Member Since: Marzo 7, 2007 Posts: 411 Comments: 15474
1614. KoritheMan 06:01 AM GMT del 26 Maggio 2010    
Quoting scott39:
When is the trough suppose to absorb 90E? How many days?


Don't you mean 90L? 90E doesn't get absorbed for the foreseeable future.
Member Since: Marzo 7, 2007 Posts: 411 Comments: 15474
1615. scott39 06:05 AM GMT del 26 Maggio 2010    
Quoting KoritheMan:


Convection displaced to the west of the vorticity maximum, due to easterly shear induced by a developing anticyclone to the east:

Does that mean it is developing more or not?
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1616. TampaSpin 06:07 AM GMT del 26 Maggio 2010    
Quoting FIU2010:
hi tim.


Hello Xcool and i are on my Website just playing with my Instant messenger.

TampaSpins Tropical Update
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1617. scott39 06:07 AM GMT del 26 Maggio 2010    
Quoting KoritheMan:


Don't you mean 90L? 90E doesn't get absorbed for the foreseeable future.
Isnt the same trough that absorbs 90L going to pick up 90E and shoot it back ENE?
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1618. KoritheMan 06:08 AM GMT del 26 Maggio 2010    
Quoting scott39:
Does that mean it is developing more or not?


It means it's still disorganized.

Remember, in order for a disturbance to intensify, it needs to have deep convection over or near its center. The current burst is displaced quite a bit away from the vorticity maximum.

90E appears to be a large, monsoon-like system, and those are notorious for only slow intensification.
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1619. KoritheMan 06:09 AM GMT del 26 Maggio 2010    
Quoting scott39:
Isnt the same trough that absorbs 90L going to pick up 90E and shoot it back ENE?


Yes, but being shot to the ENE isn't tantamount to being absorbed.
Member Since: Marzo 7, 2007 Posts: 411 Comments: 15474
1621. alexhurricane1991 06:11 AM GMT del 26 Maggio 2010    
Quoting scott39:
Isnt the same trough that absorbs 90L going to pick up 90E and shoot it back ENE?
Yes it is
Member Since: Aprile 8, 2010 Posts: 15 Comments: 2543
1622. scott39 06:12 AM GMT del 26 Maggio 2010    
Quoting KoritheMan:


Yes, but being shot to the ENE isn't tantamount to being absorbed.
True,wrong choice of wording.
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1623. xcool 06:15 AM GMT del 26 Maggio 2010    
mmm
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1624. xcool 06:16 AM GMT del 26 Maggio 2010    
I JUSTING UPDATE MY BLOG GO SEEING ITTT
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1625. scott39 06:18 AM GMT del 26 Maggio 2010    
Quoting KoritheMan:


It means it's still disorganized.

Remember, in order for a disturbance to intensify, it needs to have deep convection over or near its center. The current burst is displaced quite a bit away from the vorticity maximum.

90E appears to be a large, monsoon-like system, and those are notorious for only slow intensification.
It looks like on the current Satt, that there is a small burst of convection at the cordinates of the center.
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1626. xcool 06:22 AM GMT del 26 Maggio 2010    
lmao
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1627. alexhurricane1991 06:33 AM GMT del 26 Maggio 2010    
Alright its about that time see you in the morning!
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1628. weathersp 06:40 AM GMT del 26 Maggio 2010    
1631. xcool 06:48 AM GMT del 26 Maggio 2010    



new
Member Since: Settembre 26, 2009 Posts: 2 Comments: 15503
1633. xcool 06:52 AM GMT del 26 Maggio 2010    
anytime.
Member Since: Settembre 26, 2009 Posts: 2 Comments: 15503
1634. xcool 06:54 AM GMT del 26 Maggio 2010    
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1635. HurricaneKing 06:56 AM GMT del 26 Maggio 2010    
Quoting StSimonsIslandGAGuy:
I saw that. It almost looks like a new center is trying to form around 31 N 77 W


That right now is a mid level center from the convection that developed earlier. The other center is still moving nw just to the east of that center. It's gonna be interesting to see it there will be a reform under the mid level center or if they will some how spin to each other.
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1637. xcool 07:04 AM GMT del 26 Maggio 2010    
Member Since: Settembre 26, 2009 Posts: 2 Comments: 15503
1638. robert88 07:11 AM GMT del 26 Maggio 2010    
Looks like 90L is just looping around out there like most of the models predicted. It shouldn't be too long now and it will eject off to the NE. The gulf stream seems to be aiding some fuel on the W side of the center. I would think if the center relocated further W it could just bring more showers to the coast than expected...but it won't be making landfall.
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1639. robert88 07:19 AM GMT del 26 Maggio 2010    
I noticed on that last frame on that loop that weathersp posted it looks like almost a due S or maybe even a SSE movement. Looks like 90L is trying to burnout some 360's :)
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1641. weathersp 07:31 AM GMT del 26 Maggio 2010    
One more image before I go out...

Note the 40kt ship report over the Mid-Level Center.

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1643. robert88 07:57 AM GMT del 26 Maggio 2010    
90E could be interesting. I wouldn't be too worried until we actually have a TD with an LLC with GFDL runs.
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1644. all4hurricanes 09:45 AM GMT del 26 Maggio 2010    
Wow did the models get 90L wrong they thought it was moving back out to sea
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1645. kingy 09:48 AM GMT del 26 Maggio 2010    
top kill activities have started, get your coffee and croissants and watch the webcam, if this fails she's gushing all summer daddio
1646. IKE 10:03 AM GMT del 26 Maggio 2010    
SYNOPSIS FOR THE SW N ATLC INCLUDING THE BAHAMAS
530 AM EDT WED MAY 26 2010

.SYNOPSIS...BROAD LOW PRES NEAR 31N75W 1007 MB WILL MOVE E
TONIGHT AND THU PASSING NEAR BERMUDA FRI. THE LOW WILL DRAG A
SERIES OF WEAK TROUGHS THROUGH THE BAHAMAS WITH WINDS BECOMING
LIGHT THROUGHOUT THE AREA BY THE LATTER PART OF THE PERIOD.
Member Since: Giugno 9, 2005 Posts: 23 Comments: 37047
1647. all4hurricanes 10:05 AM GMT del 26 Maggio 2010    
Alex, Agatha, or Conson is forming this week We just don't know which one.
Member Since: Marzo 29, 2008 Posts: 0 Comments: 2192
1649. IKE 10:13 AM GMT del 26 Maggio 2010    
Quoting Jeff9641:


Good Morning! Ike what are your thoughts on 90E as this looks to be a hard one to forecast but model trends seem want to move this into the Gulf. Also, do you think a new center formed last night?


Looks to be near 95W.
Member Since: Giugno 9, 2005 Posts: 23 Comments: 37047
1650. HaboobsRsweet 10:17 AM GMT del 26 Maggio 2010    
Two thoughts. First 90L looks like it is getting better but it isnt. It is just getting a tighter gradient on the west side and that convection is interaction with a trough. It is done.

90E is very interesting but once again I caution model use. The models are still trying to intialize on 90E so they will be jumpy at first. Also it is transition season so intensity may be off by a bit. Either way This one is going to be a good one to watch.
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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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