#2886 Postby Steve » Tue Aug 19, 2008 11:45 pm
>>This might be what "Steve from down the Bayou" was talking about earlier today. If he is arond I would like to hear his comments. Anyway he mentioned another high dropping out of canada and possibly merging with this high or at least reinforcing it to put a block on Fay again. Our met even mentioned something about it this evening but I was only half paying attention. So obviously there is some kind of concensus coming together about that. Will have to wait awhile it looks like though. Probably by tomorrow the models will move north again until they get a good handle on things.
That was something the UKMET kind of tripped off early last week. I thought, obviously incorrectly, that Fay would come up toward SE FL/Bahamas and eventually get caught in the SW Atlantic and head toward, most likely, South Carolina. There was a trap/block coming down out of Canada via a high pressure system through the eastern Great Lakes and then into the Atlantic. This was why I was pretty sure that even if Fay didn't get farther west in the initial threat (which obviously it did), at some point there would be blowback and retrograde - or - Fay would sit out over the Atlantic waiting for another trough to pick it up. It was going to be a timing issue if not a track issue. So what happened after that - on some of the models, another Canadian high comes down to help usher in the heat of summer and build the Bermuda High much farther westward, or alternatively, provide another block north of Fay so that she would again either stall, get trapped or retrograde. Now we knew that Masters had already started talking about a major pattern shift. And we saw in 2005, among other years, that when the Bermuda Ridge reaches summer high-tide - regardless of how long it lasts - the threat to the US would generally be greater unless it's some insane ridge running the Mississippi River all the way to Europe - then maybe your threat is farther south (say Central America, Yucatan, Coastal Mexico).
There are two major pieces to the puzzle of a 2nd block/retrograde and they are: a) how strong does the Bermuda High get - and by the looks of the 500mb GFS, absolutely bananas, and b) would a reinforcing surface high pressure come down from Canada, but adjusted for the pattern, a little farther west and possibly stronger then the one following the trough that just missed (which was over the NC Gulf most of the week and through Florida yesterday and today).
I haven't looked at any evening models to see how any of them are handling that feature or if it even still shows up. If it does, there is the mechanism for at least some of the energy to remain in the SE for longer than it even would if it only gets caught once. Kinda sucks I can't get some of the models that I'd want to look at yet, but I'll go see what I can find and see if there is any corroboration to the possibility. You really never know. When the UKMET picked up Ivan and the possibility that the energy could split with a blowback/building high that could literally loop him all the way back to the Gulf (which it did all the way to Texas if I remember correctly), Bastardi threw that out there and got accused of mongering. I had seen that possibility in the UKMET but it's the kind of thing that you ordinarilly are going to laugh at and disregard as an insane solution.
Who knows? & sorry for rambling.
Steve
0 likes