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EPAC Tropical Action 2011


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Up to 90%. 96E sure appears to be 'on the way' to being a sizeable cyclone. It will interesting to see if it pulls a Jimena and toys with Cabo...:scooter:

Indeed. Adam ignited a slight tingle about it today. Just a slight one.

Methinks it was deliberate mischief on his part-- although of course he'd deny it if confronted.

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BULLETIN

TROPICAL STORM HILARY ADVISORY NUMBER 2

NWS NATIONAL HURRICANE CENTER MIAMI FL EP092011

800 AM PDT WED SEP 21 2011

...DEPRESSION STRENGTHENS AND IS NOW TROPICAL STORM HILARY SOUTH OF

MEXICO...

SUMMARY OF 800 AM PDT...1500 UTC...INFORMATION

----------------------------------------------

LOCATION...13.6N 96.8W

ABOUT 155 MI...245 KM S OF PUERTO ESCONDIDO MEXICO

MAXIMUM SUSTAINED WINDS...40 MPH...65 KM/H

PRESENT MOVEMENT...WNW OR 290 DEGREES AT 5 MPH...7 KM/H

MINIMUM CENTRAL PRESSURE...1005 MB...29.68 INCHES

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So the GFS and the Euro are now both showing a very wide, very sharp recurve toward the S Baja Peninsula. It's weird how wide it is-- how far out the cyclone gets before jetting toward the coast.

SSTs are marginal in this area, so the exact track-- i.e., how far S or N it is-- will have a significant impact on intensity. Fifty or a hundred miles could make a huge difference.

Anyhoo, I'm keepin' an eye on it. Let's call it pre-tingles.

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For some reason, Adam and Jorge are being very quiet in this here discussion. :D

I'm skeptical Hilary will become anything of interest from a chaser perspective. The trough looks fragile, a little piece of energy digging far enough south to displace the EPac ridging... and to top up things, recurve would start after Hilary is already near 115-120W... a faster/weaker Hilary wouldn't even feel the trough and continue trough it's W journey to meet it's remnant low fate. Yes, the GFDL is farther north in the short term, which is always the case with this model in the EPac, which seems unrealistical given the decent ridge to it's north. Only possibility is for a very slow Hilary, to start recurving at no more than 110W.

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I'm skeptical Hilary will become anything of interest from a chaser perspective. The trough looks fragile, a little piece of energy digging far enough south to displace the EPac ridging... and to top up things, recurve would start after Hilary is already near 115-120W... a faster/weaker Hilary wouldn't even feel the trough and continue trough it's W journey to meet it's remnant low fate. Yes, the GFDL is farther north in the short term, which is always the case with this model in the EPac, which seems unrealistical given the decent ridge to it's north. Only possibility is for a very slow Hilary, to start recurving at no more than 110W.

Fozzie20Bear_answer_3_xlarge.png

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I'm skeptical Hilary will become anything of interest from a chaser perspective. The trough looks fragile, a little piece of energy digging far enough south to displace the EPac ridging... and to top up things, recurve would start after Hilary is already near 115-120W... a faster/weaker Hilary wouldn't even feel the trough and continue trough it's W journey to meet it's remnant low fate. Yes, the GFDL is farther north in the short term, which is always the case with this model in the EPac, which seems unrealistical given the decent ridge to it's north. Only possibility is for a very slow Hilary, to start recurving at no more than 110W.

Well, I'm sorry I asked. :angry:

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The 12z GFS forecast is just wacky with the system weakening over the next 48 hours. Its likely one of the reasons why its track is way further south and west than the ECWMF and I don't buy it at all. This only support for this seems to be a subsident phase of the Kelvin wave that is expected to shift into the region over the next 48 hours, but I feel that Hilary has already become established enough that this shouldn't be a major issue, just perhaps somewhat limiting deeper convective development but not preventing intensification.

The ECWMF seems a lot more plausible showing the storm hugging the coastline while developing into a formidable hurricane over the next 96 hours. It does move quite a ways offshore by 120 hours, but stalls out for a day before pulling back northeast by 180 hours towards a likely Baja California impact. The stall is really going to kill it themodynamically under marginal SSTs and increasing shear, so there likely wouldn't be a major storm once it shifted back to the NE perfect prog from the ECWMF. However, there are obviously a lot of unknowns beyond 120 hours, and if we ended up with a weaker subtropical ridge things could get more interesting (which is certainly possible given all the weaker pieces of upper level energy laying over a large part of East Pacific).

So actually I think the chances of a stronger landfalling storm increase if Hilary can move slower than the current forecast 120 hour track from the NHC, implying the mid-level ridge doesn't build in as much as expected which will leave the door open towards an earlier turn to the NE when the ridge is expected to break down beyond 120 hours. That's what I'm going to pay particular attention to at this time range.

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