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Extreme flooding underway in parts of SE TX from now TD Imelda. Jerry continues to strengthen. #96L in Carib another possible flood-maker
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Wnw at 17 mph
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Archives 2000s >> 2004 Storm Forum

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Ed DunhamAdministrator
Former Meteorologist & CFHC Forum Moderator (Ed Passed Away on May 14, 2017)

Reged: Sun
Posts: 2565
Loc: Melbourne, FL
RE: More Ridging Later On
      #18097 - Sun Aug 08 2004 07:47 PM

An excellent question - and it certainly is possible. As I recall, the upper-air long wave pattern normally changes about every three to six months (JK can verify if this is still the case). It is usually a change in the actual number of long-wave troughs around the hemisphere.

When we had the unique south Atlantic activity this past March, I wondered just how unusual this season would end up being. A week ago when everyone was tracking the tropical wave that became TD2, I was watching a small tropical wave just below the equator in the mid south Atlantic. It lasted for about three days (with counterclockwise rotation) - about 10 degrees south of the ITCZ. That is the equivalent of having a CV system in the north Atlantic in late January/early February. I don't know what patterns trigger very late season activity because it doesn't happen that often - but it will be interesting to see if we have one this season. If the long wave pattern changes and rebuilds the mid Atlantic ridge, it would probably not influence storm tracks until October or later (but it has to happen first).

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Storm Cooper

Reged: Sat
Posts: 1290
Loc: Panama City , FL
Re: RE: More Ridging Later On [Re: Ed Dunham]
      #18101 - Sun Aug 08 2004 08:02 PM

That was a great question and great info Ed! Have to keep this in mind.

Hurricane Season 2017 13/7/1

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