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Hurricane Irene


Baroclinic Zone

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AWT with regards to how slow the Euro was

12z Euro ensembles in and show tight agreement through 96 hours, then a muddled mess beyond that...less out to sea scenarios, but a couple more FL scenarios, with centers ranging from up the coast to the FL panhandle. Also higher heights overall in the Northeast. This tells me that something is awry with the speed of this storm as it moves up the coast. And to that end it is slower than the 00z ensembles as well. Long way to go on this one still. FWIW, the ens. "mean" is in line with the Op Euro and overall seems slightly further west than 00z as well...still would favor an NC/SC border storm.

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The Euro ensembles have 3 camps basically.

1) Stall off the SE coast. Ridge builds in... weakness isn't enough to pull Irene north into the Carolinas. Certainly possible.

2) NC/SC slow landfall. Weakness in ridge allow Irene to slowly move north like the op run shows. At this point one of the more likely scenarios like the op shows. Whether the storm meanders due north (like op) or meanders NE out into the ocean is up in the air. Either is possible IMO depending on s/w interaction and orientation of westerlies up here.

3) A faster acceleration up the coast with bigger weakness and more interaction with Plains trough that is able to dig enough. This is like the op GFS/GEFS but there are fewer euro ensemble members in this camp than the other 2 I think. This could be a SNE hurricane hit.

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I took the "awry" part to mean he thinks the slow track up the coast was wrong when taking the ens mean

No... he means it as an unusual scenario... not necessarily wrong.

We were talking on gchat about the euro ensembles earlier.

In fact the euro ensembles bring in a whole new SE stall scenario that is possible.

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Mention from BOX:

THE WEEKEND INTO THE BEGINNING OF THE WORK WEEK...ALTHO THERE IS AN ESTABLISHED TREND...SPREAD STILL EXISTS IN REGARDSTO HURRICANE IRENE/S TRACK. SHOULD ANTICIPATE TO SEE INCREASINGCLOUDS BEGINNING SATURDAY...WITH POTENTIAL RAINS STREAMING NWDSATURDAY NIGHT INTO SUNDAY. LIGHT AND VARIABLE FLOW TO BEGIN TO TURNOUT OF THE SE. PLEASE REFER TO THE LATEST TROPICAL WEATHER FORECASTSFROM NHC/HPC.

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Mention from BOX:

THE WEEKEND INTO THE BEGINNING OF THE WORK WEEK...ALTHO THERE IS AN ESTABLISHED TREND...SPREAD STILL EXISTS IN REGARDSTO HURRICANE IRENE/S TRACK. SHOULD ANTICIPATE TO SEE INCREASINGCLOUDS BEGINNING SATURDAY...WITH POTENTIAL RAINS STREAMING NWDSATURDAY NIGHT INTO SUNDAY. LIGHT AND VARIABLE FLOW TO BEGIN TO TURNOUT OF THE SE. PLEASE REFER TO THE LATEST TROPICAL WEATHER FORECASTSFROM NHC/HPC.

Hmm... this will be interesting to watch (BOX mentions of Irene) as we move on.

If... (3% "if") it were to get closer to looking like a hit, I wonder how they will word AFDs, etc.

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