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2015 Western Pacific Typhoon Season


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https://www.washingtonpost.com/blogs/capital-weather-gang/wp/2015/09/28/watch-typhoon-dujuan-roar-ashore-in-taiwan-with-violent-140-mph-winds/

 

James Reynolds in Suao measured a 960mb pressure. Judging from the graph, the pressure looks like it rose from 961 to 981 in about a half hour, at one point it looks like a 10mb jump in ~5 minutes!

 

Also reports of 23" of rain from Taipei, not good for a major city and it's still raining there.

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We now have invests 91W passing through the Marianas and 92W passing through the Marshalls. With the former expected to sit and stew in the Philippine Sea for several days and the other near 10*N in the traditional El Nino formation zone, it wouldn't surprise me if one or both of these invests develop into a very powerful typhoon.

 

91W:

 

2015WP91_4KMIRIMG_201510121530.GIF

 

92W:

 

2015WP92_4KMIRIMG_201510121530.GIF

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Here we see this a couple of days ago in this time-smoothed animation just creeping into the right hand side of the field of view. Animation is courtesy of Dan Delany.

 

 

Sunset (last evening local time) on the developing typhoon is here with 2km resolution full-color full-disk Himawari imagery: http://rammb.cira.colostate.edu/ramsdis/online/images/hi_res/himawari-8/full_disk_ahi_true_color/full_disk_ahi_true_color_20151015083000.jpg

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Give Baguio's location (upslope flow being at 1500 m), previous rainfall totals from TCs here,

and the slow movement of Koppu, the enormous rainfall amounts shown by the ECMWF

appear plausible.  I first thought that the 2500 mm (98") total sounded overdone, but then I

thought of this event.

 


 

So the ECMWF's forecast is within what we have observed!

 

SYNOPs are available every hour for Baguio (98328) so it will be interesting to see this

event unfold.

 


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Yes, Baguio had about 85" during an event in 1911 IIRC.

 

A decoded summary is here, and Baguio had 225mm in the 24 hours ending 12Z today.

 

http://www.ogimet.com/cgi-bin/gsynres?lang=en&state=Phil&osum=no&fmt=html&ord=REV&ano=2015&mes=10&day=18&hora=12&ndays=1&Send=send

 

Latest satellite loop suggests the typhoon is continuing to move westward, so this could cut down the rainfall totals. It's already off the west coast of Luzon, so we'll see how fast it turns north.

 

UPDATE: As of Oct 19 the low level center still is closer to the coast. Baguio is up to about 730mm of rain total at 12Z.

 

Here are the daily totals:

 

10/17      3.0mm

10/18  225.0mm

10/19  501.0mm

10/20  447.4mm

10/21    35.4mm

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

Total  1211.8mm

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