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Aussie (& S-Hemisphere) Cyclone Action 2011-2012


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Actually, looking at the text file, when it was at its strongest last night, the eye was +8-+9C

So is this warming a sign that it's weakening? If yes, it would be a score for Meteo France, who's been saying all along that it would weaken as it approached the coast.

EDIT: I meant cooling-- not warming.

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The new Meteo France advisory is out. The current intensity is 932 mb/100 kt (10-min)-- a low-end Cat 4 on our scale. They say the inner eyewall is contracting and the RMW is 22 km (~12 nmi).

The advice reads:

THE LANDFALL IS EXPECTED BETWEEN ANDOVORANTO AND VATOMANDRY REGIONS.

GUSTS SHOULD EXCEED 120 KM/H IN AN AREA FROM MANANJARY IN THE SOUTH TO SAINTE-MATIE ISLAND IN THE NORTH, SHOULD EXCEED 150 KM/H FROM NOSYVARIKA IN THE SOUTH TO TOAMASINA IN THE NORTH AND SHOULD EXCEED 200 KM/H FROM MAHANORO IN THE SOUTH UP TO 90 KM IN THE NORTH OF ANDOVORANTO.

150 kph is ~80 kt, so Toamasina should get a pretty good swipe. The gusts of over 200 kph (~110 kt) will occur mostly S (left) of the center.

post-19-0-38909700-1329161750.png

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The new JTWC warning shows the center a little inland with winds of 95 kt-- suggesting the intensity was probably ~100 kt (1-min) or maybe a little more at landfall (22Z). Judging by the JTWC's initial position (19.1S 48.7E) and heading, it looks like it came ashore less than 10 mi S of Andovoranto and maybe 70 mi S of Toamasina-- thus explaining the crappy winds there.

It now looks like it's going to pass very close to the capital. At last report, Ivato International Airport was reporting gusts to 49 kt and 996 mb-- but that was almost an hour ago:

post-19-0-55250200-1329188227.gif

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So the center has apparently also passed S of Antananarivo: the pressure's now rising and the wind is blowing from the NW.

Like Toamasina, it seems like the capital got off easy. Max gusts didn't even reach 50 kt. I'm a bit surprised, because it looked like the center was going to pass very close or over the city. Interestingly, the wind lowered a little at around the time of the lowest pressure (993 mb at 7:30 am), but I can't imagine they scraped the eye. The pressure wasn't low enough and the winds weren't strong enough.

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So the center has apparently also passed S of Antananarivo: the pressure's now rising and the wind is blowing from the NW.

Like Toamasina, it seems like the capital got off easy. Max gusts didn't even reach 50 kt. I'm a bit surprised, because it looked like the center was going to pass very close or over the city. Interestingly, the wind lowered a little at around the time of the lowest pressure (993 mb at 7:30 am), but I can't imagine they scraped the eye. The pressure wasn't low enough and the winds weren't strong enough.

Reviewing the data this morning, it looks like the max winds at Ivato Airport were 35 kt gusting to 60, occurring sometime between 4:30 and 10 am. (This reading was at the end of several METARs and was labeled TEMPO-- not sure what that means.)

The lowest pressure was 993 mb at 7:30 am. At this time, the wind was blowing from the W, so the center was passing to the S. The Meteo France track suggests the center passed very close to the city-- within ~15 mi of the airport-- but by that point it had lost most of its punch and was barely a tropical storm. (The center reached its point of closest approach at 0430Z; at 0600Z Meteo France put the intensity at 30 kt (10-min).) It looks like the JTWC didn't correctly forecast the rapid decay of the cyclone, as they predicted a much more vigorous system impacting the city.

Meteo France put the landfall at 2200Z near Andovoranto, and they put the 00Z position inland with winds of 90 kt (10-min). So it looks like they and the JTWC agree on a landfall intensity around SS Cat 3. It definitely did not look like a 4, in my opinion.

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Giovanna has pilled out into the Mozambique Channel and is reintensifying. Both the JTWC and Meteo France bring it back up to a hurricane, but have it making a sharp turn before hitting Mozambique.

In other news... Cyclone 13 is strengthening and heading in the general direction of the Mascarenes (La Reunion, Mauritius, etc.)-- however, the JTWC and Meteo France disagree starkly Re: the eventual threat. At 120 hr, the JTWC shows a strong hurricane heading in the general direction of La Reunion and Mauritius, whereas Meteo France never makes it more than a depression and has it as a weakening remnant low by that time.

Interesting.

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Giovanna has pilled out into the Mozambique Channel and is reintensifying. Both the JTWC and Meteo France bring it back up to a hurricane, but have it making a sharp turn before hitting Mozambique.

In other news... Cyclone 13 is strengthening and heading in the general direction of the Mascarenes (La Reunion, Mauritius, etc.)-- however, the JTWC and Meteo France disagree starkly Re: the eventual threat. At 120 hr, the JTWC shows a strong hurricane heading in the general direction of La Reunion and Mauritius, whereas Meteo France never makes it more than a depression and has it as a weakening remnant low by that time.

Interesting.

Its got a ways to go... Madagascar did a number to the central core.

a4ra8g.jpg

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