Intensity forecast for Isaac Isaac survived passage over Hispaniola relatively intact. It's large size aided this, and this will also help it survive passage over Cuba today and Sunday. By the time Isaac pops off the coast of Cuba into the Florida Straits on Sunday, it will likely be a 50 mph tropical storm with a large, intact circulation. Isaac will be over very warm waters of 31°C (88°F) in the Florida Straits, wind shear will be light to moderate, and the upper-level wind pattern will feature an upper-level anticyclone over the storm, aiding its upper-level outflow. As I discussed in my previous post, Crossing Hispaniola and Cuba: a history, there have been five storms since 1900 with an intensity similar to Isaac, which crossed over both Haiti and Cuba, then emerged into the Florida Straits. These five storms strengthened by 5 - 20 mph in their first 24 hours after coming off the coast of Cuba. Given the relatively intact structure of Isaac so far, and the favorable conditions for intensification, I expect Isaac will intensify by 15 - 20 mph in 24 hours once the center moves off of the north coast of Cuba. If Isaac spends a full two days over water after passing the Florida Keys, it is possible that it will have enough time to develop a full eyewall and undergo rapid intensification into a Category 2 or 3 hurricane. The latest 06Z (2 am EDT) run of the GFDL model is calling for Isaac to intensify to Category 2 strength, then weaken to Category 1 at landfall in Mississippi on Tuesday. The 06Z HWRF run is calling for landfall in the Florida Panhandle near Fort Walton Beach as a borderline Category 2 or 3 hurricane. The 5 am EDT NHC wind probability forecast gave Isaac a 19% chance of becoming a Category 2 or stronger hurricane in the Gulf. I expect these odds are too low, and that Isaac has a 40% chance of becoming a Category 2 or stronger hurricane in the Northern Gulf of Mexico. I doubt the storm has much of a chance of hitting Category 4 or 5 status, though. While the surface waters in the Gulf of Mexico are very warm, near 30 - 31°C, the total heat content of these waters is unusually low for this time of year. We got lucky with the Gulf of Mexico Loop Current this summer, as it did not shed a big warm eddy during the height of hurricane season, like happened in 2005 (I discuss this in my Gulf of Mexico Loop Current Tutorial.) Without the type of super-high heat energy we had in 2005 in the Gulf of Mexico, Category 4 and 5 hurricanes in the Gulf of Mexico in 2012 will have difficulty forming.
GCWX Board Member NWS Trained Spotter - MOB
SKYSUMMITPresident | Director of OperationsAdministrator
Okay question.......I just have to ask. Since 2005, how advanced has the hurricane forecasting technology become? Is it more likely that a track 3-5 days out is written in stone? Or as previous can climatology change a couple days away that the models just can't foresee?
"My name is Jim, but my friends call me...............Jim."
Post by Zack Fradella on Aug 25, 2012 8:50:11 GMT -6
I must say I am feeling much better and even posted on my facebook that things are looking real good but something doesn't fit right now to give an all clear. You still have a few models pointing your way even though those have been terrible. Plus, the EURO tracks the system westward after landfall meaning a ridge will be building. What if that occurs a little earlier? I do feel better but we still have to watch closely.
My untrained theory on why storms tend to jump between Hispaniola and Eastern Cuba........you have a pass there between the two islands with very high mountains on either side. I'm thinking that creates almost a wind tunnel effect with almost always a southerly component that pushes storms though there in quick jumps like we have seen.
Does this make sense guys or am I looking talking out of my ###?
SKYSUMMITPresident | Director of OperationsAdministrator
TROPICAL STORM ISAAC ADVISORY NUMBER 18 NWS NATIONAL HURRICANE CENTER MIAMI FL AL092012 1100 AM EDT SAT AUG 25 2012
...CENTER OF ISAAC NEAR EASTERN CUBA...NEW WATCHES AND WARNINGS FOR PORTIONS OF FLORIDA...
SUMMARY OF 1100 AM EDT...1500 UTC...INFORMATION ----------------------------------------------- LOCATION...20.1N 74.6W ABOUT 40 MI...65 KM E OF GUANTANAMO CUBA ABOUT 385 MI...615 KM SSE OF NASSAU MAXIMUM SUSTAINED WINDS...60 MPH...95 KM/H PRESENT MOVEMENT...NW OR 315 DEGREES AT 17 MPH...28 KM/H MINIMUM CENTRAL PRESSURE...998 MB...29.47 INCHES
LEAD BUYER'S AGENT - BWL Group of Keller Williams, Visit my site at www.guidryrealty.com and like us on FB @bwlgrouprealestateteam
CWOP ID: DW2721, CoCoRaHs Station: LA-TG-11
NWS's Ponchatoula/Hammond Area's COOP Member President | Director of Operations - Gulf Coast Weather
coffeecups: I'm still lurking at the coming weather!
Apr 17, 2017 16:44:08 GMT -6
coffeecups: WOW! My patio was dry when I got home.
Apr 16, 2017 18:22:16 GMT -6
coffeecups: Came home to Harvey from Slidell. Had a little rain here and there. There was no rain in Slidell when I left at 3:30pm. While in NO EAST, I saw where it looked like it was storming around Covington going towards Slidell. Wet but no rain when I got home
Apr 16, 2017 18:21:07 GMT -6
coffeecups: I will eat some strawberries on my cruise in early May---just a few of course, as long as I stay away from my better half.
Apr 13, 2017 20:39:35 GMT -6
SKYSUMMIT: Yea, had a good bit of strawberries. Did NOT go to the fest though.
Apr 12, 2017 19:48:32 GMT -6
coffeecups: Sky, did you enjoy the strawberries?
Apr 12, 2017 18:43:30 GMT -6
SKYSUMMIT: yea, we're in a quiet lull right now
Apr 10, 2017 21:19:12 GMT -6
coffeecups: At least with the tropical forecast we have more to go on than fantasy.
Apr 9, 2017 18:00:26 GMT -6
coffeecups: Unfortunately for me, strawberries are a widower maker!
Apr 8, 2017 11:46:43 GMT -6
SKYSUMMIT: Man it's gonna be a nice weekend! If you're looking for something to do, head over to the Ponchatoula Strawberry Fest!
Apr 5, 2017 21:35:02 GMT -6
coffeecups: Are you getting like me?
Apr 5, 2017 11:08:26 GMT -6
wsmith0306: Can't believe I've never noticed this before. I must be getting old or blind. or both!
Apr 4, 2017 8:06:37 GMT -6
coffeecups: It felt cool this morning. Very nice weather!!!
Apr 4, 2017 7:13:20 GMT -6
coffeecups: Mary protected me again.
Apr 3, 2017 7:18:35 GMT -6
SKYSUMMIT: LOL wsmith....it's just a little chat box
Apr 1, 2017 8:53:27 GMT -6
wsmith0306: What's this "shoutbox" thing all about? I'm at work, so I'm whispering right now. Hope that's allowed :).
Mar 30, 2017 12:38:44 GMT -6
coffeecups: I'm hoping that I don't see any 'rare' rain events here.
Mar 29, 2017 7:39:51 GMT -6
coffeecups: ps I guess the memory of that snow is probably the only winter that I will get.
Mar 25, 2017 7:16:52 GMT -6
coffeecups: Somewhere around 1956 and 1958 it snowed so much that I thought I was in a blizzard. Of course I was only a child then, but the memory of that has NOT been met or surpassed.
Mar 25, 2017 7:15:41 GMT -6