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EPAC Tropical Action 2012


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A large-area of low-potential mush (Invest 95E) is festering ~270 mi WSW of Manzanillo. It's been upgraded to Mandarin today, but the models are unenthused.

The Euro brought it up to near tropical storm strength overnight. I'm not exactly excited, either.

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Large-scale environmental condtions over the East Pacific are beginning to change to a more favorable state for the genesis of a tropical cyclone during the upcoming week. Strong upper-level easterly flow over the East Pacific has weakened considerably in association with the approaching convectively coupled (active phase) Kelvin wave from the west. Cool-colored contours represent negative Kelvin filtered VP200 anomalies, or the convectively active phase of the Kelvin wave. Genesis is most frequent *after* the passage of the convectively active phase of the Kelvin wave within the low-level westerly wind phase of the Kelvin wave, so we might expect a period favoring for the genesis a tropical cyclone over the East Pacific sometime later next week.

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To Loop this image (I apologize for missing TRMM data in some plots- they recently updated to verision 7 without telling me!)

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Large-scale environmental condtions over the East Pacific are beginning to change to a more favorable state for the genesis of a tropical cyclone during the upcoming week. Strong upper-level easterly flow over the East Pacific has weakened considerably in association with the approaching convectively coupled (active phase) Kelvin wave from the west. Cool-colored contours represent negative Kelvin filtered VP200 anomalies, or the convectively active phase of the Kelvin wave. Genesis is most frequent *after* the passage of the convectively active phase of the Kelvin wave within the low-level westerly wind phase of the Kelvin wave, so we might expect a period favoring for the genesis a tropical cyclone over the East Pacific sometime later next week.

Cool-- I was just wondering about this. Any ideas Re: development areas? Like, stuff that may threaten the coast, or more fish-type action?

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Cool-- I was just wondering about this. Any ideas Re: development areas? Like, stuff that may threaten the coast, or more fish-type action?

Unfortunately, it's too difficult to predict where the tropical cyclone will form after the passage of the Kelvin wave in the absence of an easterly wave. Also, the East Pacific is its own beast! If I'd had to place bets, I'd say a fish storm but no scientific reasoning behind it :-P

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Unfortunately, it's too difficult to predict where the tropical cyclone will form after the passage of the Kelvin wave in the absence of an easterly wave. Also, the East Pacific is its own beast! If I'd had to place bets, I'd say a fish storm but no scientific reasoning behind it :-P

Well, other than Eugene '87, there has been no documented hurricane hit in July from the EPac.

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Wasn't what I was looking for, but yesterday's 12Z GFS ensembles had a veritable cornucopia, a plethora, of individual perturbations showing fish storms in the East Pac 9 days out.

Euro on board. Note also, in the Caribbean, the Colombian heat low and 30 knot 850 mb Easterlies, aka an Eastern/Central Caribbean doing its best to obey the John Hope rule.

msl_uv850_z500!Wind%20850%20and%20mslp!216!North%20America!pop!od!oper!public_plots!2012070200!!chart.gif

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96E continues to improve in structure and is now a Mandarin. The GFS is also suggesting a second stronger cyclone developing in the longer range near the Gulf of Tehuantepec as a future Daniel heads W...

post-32-0-61833700-1341253463_thumb.jpg

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It appears 96E is well on the way to becoming a depression, if it isn't already. The 12Z suite still suggests an even stronger cyclone developing next week just W of the Gulf of Tehuantepec.

post-32-0-59996400-1341350526_thumb.jpg

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Hi all, the center of the convectively active phase of the convectively-coupled Kelvin wave I spoke of last week is now located over 85-90W, or just to the east of 96E. The location of the invest relative to the CCKW suggests that the invest is now in an environment favorable for genesis (low-level westerly wind phase of the CCKW). I would place bets it becomes a named tropical cyclone in a matter of hours, if it is not already :)

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Daniel is looking good this morning, CDO and spiral banding apparent on infrared. I think it could become a minimal hurricane before it starts to weaken over cooler waters in 24-48 hours. Full forecast at http://weather.schematical.com/

I'm thinking perhaps 80-90 knots at max intensity. This inner core has really gotten better established today and I'd say that the environmental conditions are now favorable for rapid intensification.

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It's hard to tell given the lack of soundings over the Pacific, but Daniel certainly has the look of a cyclone that is experiencing mid-level shear. Outflow is still restricted to the north and microwave imagery shows the vortex is still tilted slightly to the southwest, despite the 850-200mb shear being in the single digits.

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