Dr. Jeff Masters' WunderBlog

Katrina may intensify rapidly
Posted by: Dr. Jeff Masters, 10:36 PM GMT on August 24, 2005 +0
The NHC 5pm discussion mentions that an experimental intensification model is forecasting a 57% chance that Katrina will undergo rapid intensification Thursday just before landfall in South Florida. The GFDL model is also calling for rapid intensification. This means that Katrina could be a Category 3 hurricane when it hits South Florida. The current thinking is still that there is enough dry air around Katrina to make it a strong tropical storm or weak Category 1 hurricane at landfall, but keep in mind that hurricane intensity forecasts are very unreliable.
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451. wpb05 3:42 AM GMT on August 25, 2005    
for some reason i just have a very eerie feeling about this storm sitting in west palm beach........i don't think the NHC has quite a good grasp on it yet
452. cjnew 3:44 AM GMT on August 25, 2005    
Linkthis is the gfdl model...is this the new run?
Member Since: July 22, 2005 Posts: 84 Comments: 2779
453. StormJunkie 3:44 AM GMT on August 25, 2005    
So the GFS is again the extreme, but all other model have shifted closer to the GFS of yesterday. Everyone from S Florida, to the upper gulf coast, to the southeast coast needs to watch this system closely. Looks good on radar, just a little dry air still to the N an W that it may try to wrap in but unlikely. This thing could get strong and I for one still think it could go anywere.
Member Since: August 17, 2005 Posts: 26 Comments: 15218
454. leftyy420 3:45 AM GMT on August 25, 2005    
well iamnot going that crazy but 85-100kts is not out of the question specially if she stalls over open water
Member Since: August 24, 2005 Posts: 35 Comments: 1987
455. caneforecaster 3:45 AM GMT on August 25, 2005    
the radar is showing a light spot clearing out just to the south of where that other "eye"-like feature was...what I see now on radar much more resembles an eye with everything rotating clearly around it. It also confirms a due west motion.
456. rxse7en 3:46 AM GMT on August 25, 2005    
http://moe.met.fsu.edu/mm5/KATRINA.track.png another model that agrees with the northeast Florida exit.

B
Member Since: August 21, 2005 Posts: 0 Comments: 526
457. hurricane79 3:46 AM GMT on August 25, 2005    
New forecast map I just published Link
458. cherikm 3:47 AM GMT on August 25, 2005    
I live in Pinellas County, just west of Tampa Bay. How close do you all think it will be?
459. leftyy420 3:47 AM GMT on August 25, 2005    
no actually the gfs has hsifted east as well. tho model that has had this sytem the bst has been the gfdl. the gfs now doesn't really brig her on shore and moves her up the east coast. befor she moved over florida than turned north. all this is do to better knowldege og the orientation of the ridge
Member Since: August 24, 2005 Posts: 35 Comments: 1987
460. leftyy420 3:48 AM GMT on August 25, 2005    
the mm5 fsu is highly unrel;iable as it is just experimental, possibly a new models in the future. i rearely look at it
Member Since: August 24, 2005 Posts: 35 Comments: 1987
461. caneforecaster 3:49 AM GMT on August 25, 2005    
the GFS looks reasonable so far..thru 42 hrs
462. hurricane79 3:49 AM GMT on August 25, 2005    
cherikm, Katrina could easily come within 40 miles of us. The problem is Katrina could make a curve when it enters the Gulf that would keep her within 100 miles of us for over 24 hours.
463. rxse7en 3:49 AM GMT on August 25, 2005    
79, would you mind not pointing your arrow at my house? M'kay, thanks! :)
Member Since: August 21, 2005 Posts: 0 Comments: 526
464. StormJunkie 3:50 AM GMT on August 25, 2005    
If this thing chooses to meander off shore before resuming movement a CAT 4 or 5 is not out of the realm. I agree with WPB. Her sleeves are not rollde up yet and she has not flipped her hole cards. This will be a strange ride before it is all said and done.
Member Since: August 17, 2005 Posts: 26 Comments: 15218
465. cherikm 3:51 AM GMT on August 25, 2005    
I'm worried about how strong she could get when she enters the gulf. The water is just plain hot right now!
466. hurricane79 3:53 AM GMT on August 25, 2005    
Lucky guess Rx :)
467. StormJunkie 3:53 AM GMT on August 25, 2005    
Lefty, the GFDL is the southern most outlier. While not out of the realm can you really say that it has been the most accurate with this storm? It also never had it making it as far N or E as it currently is.
Member Since: August 17, 2005 Posts: 26 Comments: 15218
468. caneforecaster 3:54 AM GMT on August 25, 2005    
Hallelujah (can't spell that)....the GFS has come to its senses!

Now shows it exiting the GUlf coast near Naples, FL......
469. StormJunkie 3:54 AM GMT on August 25, 2005    
I want to see her half way across Florida and moving W at a good clip before I am certain that she enters the Gulf.
Member Since: August 17, 2005 Posts: 26 Comments: 15218
470. wpb05 3:55 AM GMT on August 25, 2005    
trust me...we have bath water on this side too....i read in the post the other day it is the warmest ever here.....we were in it the other day and it was horribly warm......
471. hurricane79 3:56 AM GMT on August 25, 2005    
cherikm, when Katrina gets into the gulf, she will have winds only about 50 MPH, but remember Dennis earlier this season that had "rediculous" strengthening upon hitting the Gulf. So I am not 100% sure about the intensity, but it will regain hurricane status.
472. StormJunkie 3:56 AM GMT on August 25, 2005    
Where do you see that Cane?
Member Since: August 17, 2005 Posts: 26 Comments: 15218
473. caneforecaster 3:59 AM GMT on August 25, 2005    
LOL...now the GFS has it getting stuck on the Gulf Coast (instead of the Atlantic)...at least thru 72 hrs. But hey, it's a trend and I'll take it. Stuart has had their fair share of hurricanes. =)
474. cherikm 4:00 AM GMT on August 25, 2005    
I can just remember watching Charley in awe last year. We had evacuated to a friends house and were glued to the news and I swear it seemed like it jumped from a 2 to a 4 in just a couple updates. I know they can really intensify quickly and after Charley, anything coming up the coast worries me as no one really knows when or if it will turn towards the coast.
475. caneforecaster 4:00 AM GMT on August 25, 2005    
here storm...Link
476. StormJunkie 4:00 AM GMT on August 25, 2005    
The movement seems to me to be a very slow slightly N of due W. Agree?
Member Since: August 17, 2005 Posts: 26 Comments: 15218
477. wpb05 4:00 AM GMT on August 25, 2005    
showers beginning here in wpb...sure to increase over the next couple hours
478. hurricane79 4:00 AM GMT on August 25, 2005    
The GFS seems to be painting a bad scenario for the West Central Coast of FLorida...especially with the rainfall potential
479. Zeenster 4:01 AM GMT on August 25, 2005    
Hey Cane - can you give me a link to the new run? All I seem to find is the 18Z run when I go hunting for GFS runs...Thanks! :-)
480. caneforecaster 4:01 AM GMT on August 25, 2005    
no I don't really agree. I see due west..
481. caneforecaster 4:02 AM GMT on August 25, 2005    
zeenster- I just posted it above in the "here storm" post...
482. wpb05 4:02 AM GMT on August 25, 2005    
it is wobbling...but i think that has more to do with a possible eyewall development, sort of akin to when it begins eyewall replacement cycles....not to mention it is slowign to a point where nay movement looks more than it really is
484. Halon056 4:03 AM GMT on August 25, 2005    
I tend to agree, it looks as if she has almost stalled
Member Since: July 16, 2005 Posts: 0 Comments: 349
485. caneforecaster 4:05 AM GMT on August 25, 2005    
hey storm...you better watch it Jeff14 might get a hold of you. ;-)
486. wpb05 4:05 AM GMT on August 25, 2005    
what do we think recon will find in an hour...what do we think the pressure has dropped to and the winds increases to....i think it is safe to say we are not dealing with a four digit pressure anymore
487. STORMTOP 4:05 AM GMT on August 25, 2005    
STORMTOPS NWS BULLETIN 11PMCDT

OBSERVATIONS TONIGH HAS SEEN KATRINA DDEPEN IN THE PRESSURE OF THE STPRM AND GAIN A LITTLE STRENNGT..THE MOST APPARENT THING IS KATRINA JUST AS I SAID EARLIER WAS MOVING ON A STRAIGHT WEST HEADING AND THIS WILL CONTINUE TO THE STORM REACHES THE FLORIDA COAST I THINK IT WILL BE JUST SOUTH OF MIAMI..LET ME EXOLAIN WHY I FEEL THIS WAY..KATRINA HA SALREADY BEEN UNDER THE INGLUENCE OF THIS VERY STRONG EAST TO WEST HIGH PRESSURE SYSTEM WHICH I PERSONALLY THINK THE NHC DOES NOT REALLY KNOW HOW STRONG THIS HIGH WILL BE...I THINK KATRINA WILL START MOVING WSW LATER IN THE 48 HOUR PERIOD COMING OFF SHORE IN THE SOUTHESATERN GULF JUST SOUTH OF MIAMI AS A CAT 1...I EXPECT THE WINDS TO BE 80 MPH BY 11AM TOMORROW AND 95 WHEN KATRINA HITS SOUTHERN FLA...AFTER THAT KATRINA WILL NOT SLOW DOWN AS EVERYONE IS EXPECTING IT WILL CONTINUE TO MOVE IN A WEST DIRECTION UNTIL 85 DEGRESS THEN MAKE ITS TURN TOWARDS THE WNW SATURDAY NIGHT AS KATRINA STRENGTHENS INTO A DANGEROUS CAT 4 HURRICANE WITH WINDS APPROACHING 145MPH...ON SUNDAY A COLL FRONT WILL DROP DOWN FROM THE ROCKIES AND WEAKEN THE HIGH THAT IS NOW OVER LA MS ALABAMA...THIS WILL CAUSE KATRINA TO MAKE THE FINAL TURN TOWARDS THE NW AS THE HIGH IS PUSHED WESTWARD INTO TEXAS...SUNDAY MORNING A HURRICANE WATCH WILL BE ISSUED FROM HOUMA LA TO PENSECOLA FLORIDA..KATRINA BY THIS TIME WILL BE A CAT 5 WITH WINDS APPROACHING 170MPH BY SUNDAY NIGHT AS SHE NEARS A LANDFALL...THE GREATEST THREAT FOR HURRICANE WARNINGS WILL BE FROM NEW ORLEANS TO MOBILE ALABAMA...MY PREDICTION KATRINA MOVES ON SHORE MONDAY NIGHT WITH WINDS OF 170MPH NEAR PASS CHRISTIAN MISS...THIS IS A SERIOUS SITUATION FOR BOTH MISS,LA, AND ALABAMA..THATS THE LATEST THINKING RIGHT NOW ILL BE BACK WITH ANOTHER UPDATE ABOUT 8AM IN THE MORNING AFTER I READ MORE NEW DATA COMING IN...FOLKS I CANT STRESS THIS ENOUGH WHEN KATRINA GETS OVER THE GULF SHE WILL BE OVER IT FOR 2 WHOLE DAYS IN 89-95 DEGREE TEMPS..PLEASE TAKE ALL NECESSARY PRECAUTIONS AGAINST THIS RECORD BREAKING HURRICANE....
488. Zeenster 4:06 AM GMT on August 25, 2005    
Thanks, Cane. Hey StormJunkie...breathe a little slower, dude. Remember Schwartz-ey boy's bio and just relax and picture him in Oz...LOL. The only cure for him is the MUTE button. Works great at my house!
489. caneforecaster 4:08 AM GMT on August 25, 2005    
OK I have an idea here....will announce it shortly.
490. AySz88 4:09 AM GMT on August 25, 2005    
Hi, I'm a beginner at all of this, right now mostly just watching and collecting links to maps and loops.... What happens if the 'eye' that's getting covered now on the radar is indeed the center? Does that mean it's getting stronger or weaker?
Member Since: August 25, 2005 Posts: 0 Comments: 8
491. leftyy420 4:10 AM GMT on August 25, 2005    
no look at the gfdl slowly and look at the time stamps. she takes her nw than w and wsw than west again. where the center currently is is where the gfdl said it would be than 12 hrs it starts its turn
Member Since: August 24, 2005 Posts: 35 Comments: 1987
492. caneforecaster 4:10 AM GMT on August 25, 2005    
Hey beginner. =)

IMO, it is a good sign for the stage we're at. It most likely means convection is exploding over the center and temporarily obscuring it. Thus far we have not had a real "eye" yet anyway. This usually comes about the same time as hurricane strength....
493. caneforecaster 4:11 AM GMT on August 25, 2005    
alright leftyy, do you promise not to flip out here in a minute?
494. Zeenster 4:11 AM GMT on August 25, 2005    
Welcome, AySz88! Glad to have you on board. We hope you learn a lot from us - amateurs and pros alike. :-) Ask anything you like, and don't worry if it's a "dumb" question...we've all been there at one time or another. You might find a few links to collect on my florida resident blog, too, so poke around in there for your collection.
495. StormJunkie 4:13 AM GMT on August 25, 2005    
Thanks for the uderstanding and love ya'll. He drives me nuts. If it had not been for you guys I might have taken a bat to the TV.lmao
Member Since: August 17, 2005 Posts: 26 Comments: 15218
496. leftyy420 4:13 AM GMT on August 25, 2005    
and in the 11pm track the nhc almost folows the gfdl and has moved thier forcast track south than where it was in the last update
Member Since: August 24, 2005 Posts: 35 Comments: 1987
497. Halon056 4:13 AM GMT on August 25, 2005    
oh brother! cane is fixin to stir up something.....
Member Since: July 16, 2005 Posts: 0 Comments: 349
498. leftyy420 4:13 AM GMT on August 25, 2005    
as long as people don't call me stormtop again
Member Since: August 24, 2005 Posts: 35 Comments: 1987
499. cornflake826 4:13 AM GMT on August 25, 2005    
Well I haven't posted for a while but Im concerned my humble little mobile home in Dania Beach isn't going to fare to well. And I now believe StormTop needs to change his name to doomstop. Sorry top you must have a hard on for this girlie katrina.
500. caneforecaster 4:14 AM GMT on August 25, 2005    
I'll take that as a yes.

Just an observation of mine- you disappeared all of a sudden and then tada comes an update from STORMTOP. I said "OK guys I have an idea" as a signal that I was onto something, and was predicting your return shortly. Within two minutes you returned posting......
501. caneforecaster 4:15 AM GMT on August 25, 2005    
lol too late!

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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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