Dr. Jeff Masters' WunderBlog

Texas floods kill 5
Posted by: Dr. Jeff Masters, 3:59 PM GMT on May 26, 2007 +6
Flash flooding triggered by heavy thunderstorm rains of up to seven inches in 24 hours claimed at least five lives in Texas Friday, and large portions of the state remain under flood warnings or flood watches today, as thunderstorms continue across the state. All of those killed were swept away in their vehicles, and police were still looking for a missing man who drove around a barricade blocking a swollen creek.


Figure 1. Precipitation for the 24 hours ending at 8am EDT Saturday May 26, 2007.

Drought last year, floods this year
As I discussed in a March blog last year, grass fires in drought-parched Texas killed seven people on March 12 in the Panhandle, four of them in a car crash on I-40 caused by thick smoke obscuring visibility. More than 1,000 square miles of Texas burned that day--an area about two-thirds the size of Rhode Island. It's amazing what a turnaround has occurred in the past year. Most of Texas and Oklahoma were under drought conditions that reached the extreme level last spring (Figure 2), but this year, the Texas/Oklahoma drought is gone (Figure 3), and instead has moved into the Southeastern U.S. We don't understand very well what causes these shifts in drought patterns, but they do seem to be linked to changes in large-scale sea surface temperature patterns in the Atlantic and Eastern Pacific, plus shifts in the jet stream pattern. Are the floods in Texas this year and drought last year partially due to global warming? Yes, they might be. Global warming theory predicts that both droughts and floods will grow more severe as the climate warms. Floods will increase, since a warmer atmosphere holds more water vapor that can then rain out into heavier floods. Scientists have already documented about a 5% increase in global atmospheric water vapor due to global warming, and this extra moisture is undoubtedly causing heavier rains and more flooding in some regions. Drought will increase in intensity due to global warming, thanks to the hotter temperatures drought-striken areas will receive when jet stream and sea surface temperature patterns conspire to keep rainfall from the drought area.


Figure 2. Drought map for March 7, 2006.


Figure 3. Drought map for May 22, 2007.

Jeff Masters
Categories: Climate Change Flood
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701. KoritheMan 5:57 AM GMT on May 28, 2007    
Good Evening Folks.....It seems to me that it might be a slow start to the season (quiet in early June), but, that should not keep people from stocking up and preparing for what may become a memorable season come July and August...

Uh...no, I don't think a slow start to June is likely. I am not going to preach like I know it all or that I want tropical cyclones, but shear will definitely start to lower within the next week or two I would guess. That's when we could see the development of a storm or two in June. Anymore storms besides 2 in June is very unlikely, although ANYTHING is possible, and I'll definitely read all the comments here, and use the data from this site to keep track of anything that may develop.
Member Since: March 7, 2007 Posts: 422 Comments: 15662
703. HCW 10:18 AM GMT on May 28, 2007    
Carribean system model update

CMC =intense system big bend / panhandle on Friday

UKMET= weaker system across the FL west coast then it moves off the FL/GA boarder then deepens and brushes the SC/NC coast

GFS= still seems lost at this time

Hardcoreweather.com

Link
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704. stoormfury 10:31 AM GMT on May 28, 2007    
Good morning to all

the tropics look relatively quiet tis morning except for td 1E and the blob in the sw caribbean. the area continues to hold its own, albeit under slackened wind shesr. may be if the system were to sit out there for a few days then, there might be a chance of further devepment
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705. kmanislander 11:27 AM GMT on May 28, 2007    
good morning

The low in the SW Caribbean is at 1009 mb. Still has a chance IMO
Member Since: August 19, 2006 Posts: 0 Comments: 14988
706. StormJunkie 11:38 AM GMT on May 28, 2007    
Morning y'all ☺

kman, where are you getting the close up Quickscat of the Carib?

This is where I have been going...

Never mind kman. Never realized the maps here were click and zoom...lol
Member Since: August 17, 2005 Posts: 26 Comments: 15240
707. kmanislander 11:56 AM GMT on May 28, 2007    
Hi SJ

This is the low res QS page. Just scroll down to the images. The Hi res images have been off line for a couple of days
Link
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708. kmanislander 11:57 AM GMT on May 28, 2007    
This is the hi res link

Link
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709. BahaHurican 12:16 PM GMT on May 28, 2007    
Morning, all.

Still winds in the 15 mph range here. That high pressure and the steep gradient is keeping it cool in the Bahamas so far this week.

To all the Americans out there, enjoy your Memorial Day.
Member Since: October 25, 2005 Posts: 19 Comments: 17962
710. StormJunkie 12:29 PM GMT on May 28, 2007    
Any thoughts? Looks like circulation to me, but I may be misreading it.

Quickscat
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711. HurricaneFCast 12:49 PM GMT on May 28, 2007    
It does of the possibility to develop if it can hang on here for the next few days. It'll be interesting to watch.
FORUM GIANT- NEW WEATHER FORUM!
Member Since: April 20, 2007 Posts: 7 Comments: 1482
712. stormpetrol 1:04 PM GMT on May 28, 2007    
Look as though the northern part is starting to break off from the southern part. I think this would allow for that low in the SW Caribbean to have more potential for development, will be interesting to see what happens, looks like it might be less shear also.
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713. TheRingo 1:05 PM GMT on May 28, 2007    
I think this low in the caribbean really has a chance now. It's been very persistent and now it looks like the ull is pulling out and leaving it behind.
714. MZT 1:10 PM GMT on May 28, 2007    
It looks pretty puny right now. About all that I'd be willing to say is that the air around it doesn't look as dry as yesterday.

I guess every storm has humble beginnings but that is more of a blip, than a blob... :-)
Member Since: September 24, 2005 Posts: 0 Comments: 782
715. HIEXPRESS 1:15 PM GMT on May 28, 2007    
http://www.cpc.ncep.noaa.gov/products/hurricane/hurricane-AMMA/hgt_vort_1000_atl_animation.html

From

It does look like something could start there, but instead of the usual W or N to the Fl panhandle, is pulled NNE by the trough that's still there , gets sheared & is pulled across Cuba or just skirts it & brings (more) rain to S FL. Just my wild guess.
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716. StormJunkie 1:16 PM GMT on May 28, 2007    
SP, I agree that southern end seems to be detaching more now, which should give it a better chance. From that Quickscat it looks like the circulation is decent. The shear right over it should be fairly low. SSTs are plenty warm. It will be interesting to see what the area looks like once we get some more visible images.
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717. kmanislander 1:20 PM GMT on May 28, 2007    
SJ

That QS pass you posted shows a circulation just about at 12n 78W
It will need to build more convection though if it is to survive
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718. kmanislander 1:22 PM GMT on May 28, 2007    
Not too much going on now but low level inflow streamers can be seen

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719. nawlinsdude 1:26 PM GMT on May 28, 2007    
It has survived for the past few days and did so again last night, lets see if it gets its act together today.
720. StormJunkie 1:29 PM GMT on May 28, 2007    
True kman, but as well defined as the circulation is, according to the quickscat and the first few visual images, it should be able to hang on even though I would expect convection to die down for most of the morning and early afternoon.
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721. kmanislander 1:32 PM GMT on May 28, 2007    
Well I have to run now but will bbl
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722. IKE 1:40 PM GMT on May 28, 2007    
It does look like the system is now moving slowly west.

This from the Tallahassee,Fl. extended....

"Was hoping that the global models would come into better agreement
with regards to a possible system coming out of the western
Carribean into the eastern Gomex during the end of the week and
first half of the weekend. Unfortunately the guidance remains split.
The GFS is showing a rather weak wave moving up with just an
increase in low level moisture while the European model (ecmwf) and UKMET develop the
system a bit more bringing a closed low into the southeast
Gulf on Saturday...then crossing the Florida Peninsula. The Canadian
which has been bullish with this system all along is showing the
closed low moving north through the eastern Gomex into our area.
With as much uncertainty as there is at this time...have ran the
forecast closer to the GFS solution as is suggested by HPC while
waiting for better model agreement. One way or the other it appears
as though there will finally be a chance for some locally beneficial
rain by the end of the week."
Member Since: June 9, 2005 Posts: 23 Comments: 37070
723. catastropheadjuster 1:41 PM GMT on May 28, 2007    
Good Morning all and Happy Memorial Day. I hope everyone stays safe.
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724. keywestdingding 2:08 PM GMT on May 28, 2007    
hey yall. whats this big change people are talking about next week. hey storm junkie you had 2 pics of the ssts on his last blog. what where the years for them?
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725. kmanislander 2:22 PM GMT on May 28, 2007    
Weather station 42058 has failed. Not good news. Hope they get it repaired soon.

Link
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726. keywestdingding 2:29 PM GMT on May 28, 2007    
hey-is it me or is the ocean cooling off? does anyone know what the heck is going on out there. maybe dr. masters will do a blog on it
Member Since: March 6, 2007 Posts: 0 Comments: 88
727. southbeachdude 2:35 PM GMT on May 28, 2007    
hey kw.....maybe it is global cooling... lol
Member Since: July 29, 2005 Posts: 2 Comments: 694
728. weatherboykris 2:37 PM GMT on May 28, 2007    
The ocean has been cooling due to those gusty winds.Now that they're slowing down,expect it to heat up again pretty fast.The Gulf Stream will be pumping warm water back up the coast again.It should be back where it was in a week or two.
Member Since: December 9, 2006 Posts: 125 Comments: 11343
729. nash28 2:39 PM GMT on May 28, 2007    
It's the A/B High that is causing upwelling. It has been stronger than normal, but is forecast to come back down to 1024mb I believe.
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730. weatherboykris 2:39 PM GMT on May 28, 2007    
Actually,it's not the Bermuda high.It's a continental high that came down with a backdoor cold front.
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731. RL3AO 2:42 PM GMT on May 28, 2007    
TD1-E update. Still at 30 kts. Storm in 24 hrs, peaking at 40kts.
732. MZT 2:46 PM GMT on May 28, 2007    
Meh. Andrea had better structure than this Carribbean thing.
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733. TheCaneWhisperer 3:01 PM GMT on May 28, 2007    
Big traffic jam in the basin right now! From The west coast of the US into Europe! Things don't look to get moving again until late this week, early next week! GFS is predicting some pretty substantial rains by week 2! The GFS has been doing poorly on cyclogenisis but, has been doing rather well with the dynamic patterns. See My Blog for details!
734. HCW 3:01 PM GMT on May 28, 2007    
Shear from the ULL at 30 to 40kt is not allowing this thing to form


hardcoreweather.com
Link
Member Since: August 10, 2002 Posts: 0 Comments: 1291
735. groundman 3:14 PM GMT on May 28, 2007    
Not making fun of anyone but myself for refreshing the page when I KNOW there is nothing going on, maybe we should rename this the association of westcasting blobwatchers??
I'm going to try to stay off of here for 12 hours and maybe something will actually happen, talk about a watched pot, LOL. Back to comically lurking.
groundman
736. sullivanweather 3:21 PM GMT on May 28, 2007    
Posted By: weatherboykris at 2:39 PM GMT on May 28, 2007.

Actually,it's not the Bermuda high.It's a continental high that came down with a backdoor cold front

Good ob kris.

Origin of this high is dry. Drier dewpoints means greater ability to cool off SST's.
Member Since: March 8, 2007 Posts: 269 Comments: 12492
737. keywestdingding 3:46 PM GMT on May 28, 2007    
thats guys for the info.
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738. PalmBeachWeatherBoy 3:53 PM GMT on May 28, 2007    
it looks like a rather small system if it does develop
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740. IKE 4:12 PM GMT on May 28, 2007    
Looks like the center of the Caribbean disturbance...to me...is around 16N, 77.5W...moving west.
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741. Patrap 4:20 PM GMT on May 28, 2007    
GOES Water Vapor Loop of Gulf and Caribbean Link
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742. IKE 4:23 PM GMT on May 28, 2007    
And it's broken away from the low that's moving NE to the east of the Bahamas...it's on it's own moving west. Looks like a slight flair up near the center.
Member Since: June 9, 2005 Posts: 23 Comments: 37070
743. IKE 4:27 PM GMT on May 28, 2007    
That's a ULL east of the Bahamas...predicted to move NE. Whether the Caribbean disturbance forms a TD or not...the moisture is predicted to get into the GOM...may help end the fires.
Member Since: June 9, 2005 Posts: 23 Comments: 37070
744. Patrap 4:30 PM GMT on May 28, 2007    
Plenty of rain and Thunderstorms moving onshore here..Link
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745. TheCaneWhisperer 4:35 PM GMT on May 28, 2007    
I wonder if someone should tell these people they're swimming right next to a RIP CURRENT. (Lower Right of Image)
746. hurricane23 5:06 PM GMT on May 28, 2007    
Dont see any worries in the caribbean at the moment with convection being very scattered in nature with no organzation.
Member Since: May 14, 2006 Posts: 8 Comments: 13331
747. weatherbro 5:12 PM GMT on May 28, 2007    
hi i'm new here.

last time i checked (late last night). most computer models veered the carribean blob northeast away from the U.S. exept one.
Member Since: May 26, 2007 Posts: 47 Comments: 1156
748. nash28 5:13 PM GMT on May 28, 2007    
12z CMC run still develops the low and moves it over the FL Panhandle. Weaker on this run, but still consistent. Shear is dropping, albeit slowly each day. Don't count this one out.
Member Since: July 11, 2005 Posts: 190 Comments: 16972
749. swlaaggie 5:19 PM GMT on May 28, 2007    
Morning all. Pouring here in SW La. from rains moving on-shore.

I've looked at some other postings but anyone notice that the Pacific TD is modeled to move NE and cross Central America? Hopefully, land chews the thing up. Anyways, the GFDL doesn't show this for roughly 126 hours out. Probably osmething just to keep an eye on but no real worries here.
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750. weatherbro 5:21 PM GMT on May 28, 2007    
thats the one i think lol
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751. Skyepony (Mod) 5:23 PM GMT on May 28, 2007    
About time 91E is up
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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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