Typhoon Megi Slated For 2nd Landfall in East China; Taiwan not totally out of woods


Note Typhoon Megi ragged, off-center eye at 18:30Z 10.21.10 on West Pacific Rainbow IR image (click for most recent loop)

Typhoon Megi JTWC Forecast Track 10.21.10

Typhoon Megi:  4 days ago, prior to then Super Typhoon Megi’s landfall on the Philippines, I had mentioned in my long term analysis that “… if the trof is fast and very deep, it could conceivably turn the storm north and then northeast.  While there may not be sufficient room in the sea for this to occur without striking land, that scenario would put Taiwan at risk of a hit from the Southwest…”  At the time, the forecast from the Joint Typhoon Warning Center called for the storm to track well to the Southwest of Hong Kong, perhaps toward the South China island of Hainan.  As it turns out the trof that was expected to turn the storm northwest was, in fact, deeper than forecast and Typhoon Megi turned North-Northwest not long after it emerged in the South China Sea. 

Typhoon Megi Visible Satellite 10.21.10

The damage from then Super Typhoon Megi to thePhilippines was largely to agricultural concerns. (Image Gallery) While the current agricultural outlook for the Philippines is stable, longer term consequences could result.  The loss of life was limited, considering that prior to landfall Megi had hit nearly 167 kts (190 mph) sustained winds with gusts to 220 mph.  It weakened a shade at landfall but was still an extremely strong super typhoon.  But, it moved across the island at a steady clip and had its greatest impact on less populated parts of the nation so flooding and loss of life was limited.

10.21.10 TPW image clearly shows Typhoon Megi nearing the Taiwan Strait (click for real time previous 72 hour loop)

Map of South China and Vicinity

At 15 UTC (Z) October 21, 2010 Typhoon Megi was about 250 nm southeast of Hong Kong moving North-Northeast at just 4 kts.  The trof in Southeast Asia dug so deep that it created a contraction in the steering ridge over the Western Pacific and the storm is now moving around the periphery of that ridge.  It is moving into cooler water which will hamper any further development but its got such a good outflow to the North that the decreasing intensity trend will be slower than what might otherwise occur.  Nevertheless, as it interacts with southwesterly flow aloft as it runs up along the trof to the northeast, it will begin to get ripped apart.  As I had mentioned a few days ago, if it weren’t for land getting in the way, this guy may have been a threat to Taiwan but the Chinese coast should get into the way. 

Note 7 day rainfall total related to Typhoon Megi ending 15 UTC (Z) 10.21.10 From NASA TRMM

In all likelihood, China will experience a weakening typhoon making landfall across the Taiwan Strait from Taiwan somewhere in between Shantou and Xiamen.  It is possible that the winds may have fallen to below typhoon strength by then.  I would think that the greatest concern would be for flooding as the storm, while dissipating, will have the potential to bring very heavy rains and the flooding threat will increase should the remnant of Megi move at a snails pace, which is not uncommon for a dissipating tropical cyclone.  Still, it is not totally out of the question that this guy gets so caught up in the trof that it tracks a bit more northeast, as some models suggest.  Should that occur, then Taiwan may be under the threat of a dissipating tropical cyclone from the Southwest.  As it stands, the time frame of ultimate landfall would be about 6 UTC (Z) October 23, 2010 and I suspect that would be the case if it follows the current forecast track or if it wandered farther north or northeast.

Weather Bottom Line: Our weather is lame. Nice…but lame.  Highs in 70’s lows in 40s  tonight.  A rain chance does show up by the second half of the weekend, but we’ll talk about that tomorrow.  Only caveat is that we had a little boundary come through and cooler drier air will filter in taking us down into the 30’s in some spots.  Frost possible in some areas but if the breezes persist, it may not get as chilly as some may think and the wind would also tend to limit frost.

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