Blogtrek

Blogtrek

2004/09/04

Ivan is in the act

There are now two storms out there: Frances and Ivan. Frances has nearly, but not quite, stalled just before hitting Fort Pierce, Florida. It now is forecast to go out into the Gulf of Mexico, reenter at Apalachicola, and come up Alabama and Tennessee, going by Memphis, Nashville, and Indianapolis. It has stalled so much now that some of the models, notably GFS, UKMET, and CMC have gone to the east, threatening to hit the western Virginia mountains. If that happens, Richmond will get massive river flooding, and it is already recovering from flooding from 11 inches of rain from a mere tropical storm Gaston. So we will have to wait for that.

But Frances has so occupied the attention of broadcasters and weather people that not a one is mentioning Ivan at all. Gary Gray does not mention it at all, and some of the models are suggesting this could be another Frances. So I will give my Ivan analysis after looking at the models.

Several models are calling for Ivan to go to the north, and follow the same track as Frances, including UKMET, NOGAPS, and GFDL. However, they take it only to the Bahamas before quitting. The only model that goes further is GFS, which goes to 16 days, but this model poofs the storm. After it gets to Puerto Rico, it just simply dissolves into a mess of other clouds. So what do you do when the models strongly suggest one thing, but the only model that will tell the full story is telling something different? I looked at the high pressure systems. There is a big one to the north. That's the one giving us the good weather this week. It is supposed to move off the coast, allowing Frances to take a more northeasterly track. Another high will come in from the US Midwest. In between will be a trough established by Francis and a couple of other non-tropical storms, and I am afraid that Ivan will go up this trough. In other words, it will come up to Florida, then veer off to the north and east and possibly hit the Carolinas and Virginia. It may not be as strong as Francis, but I certainly don't want that to happen. I will have to wait until the time gets to where the short models will pick up landfall, or GFS decided to realize the storm and tell us how it is going to go.

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