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Major Hurricane Irma


NJwx85

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23 minutes ago, Sportybx said:

Isn't it just going to get stronger and stronger the more it moves into the warmer water . Wouldn't be surprised if it opened up a bit and grew in size 

Typically, a hurricane increases in size following an ERC, and/or as it gains latitude towards the subtropics.  In this case, both variables should apply    

 

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1 hour ago, olafminesaw said:

GOES00302017248z_Tv23_A.jpg

Looks very Andrew-like. Compact buzzsaw blade with large CDO and relatively minimal banding; although probably somewhat larger than Andrew was already and forecast to get larger. Forecast destination is, ominously, growing more similar by the model run, although the angle of approach will be different and obviously still a lot of time for change.

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24 minutes ago, ncforecaster89 said:

They didn't, as is specified in the NHC forecast discussion at 5 pm EDT:


Six hourly upper-air soundings began at 1800 UTC today over the
central United States to better sample the upstream mid-latitude
trough.  In addition, the NOAA G-IV aircraft is currently sampling
the environment around Irma, and these data will be included in
tonight's 0000 UTC model runs.

Any observations taken between 1500 and 2059 and having arrived to the center before 2045 will have been assimilated into the 1800 utc gfs.  You are misunderstanding their point in that the giv data will start arriving for the 00 utc cycle.  Anything taken between 2100 and 0259 will be used to initialize the 00 utc gfs.

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3 minutes ago, NJwx85 said:

Irma looks amazing on IR loop. It finally repaired the NE flank which was feeling some restriction from the ridge. It might completely bomb out tonight.

Was getting ready to post this verbatim. Wouldn't be surprised to see Cat 5 by morning.

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50 minutes ago, StormchaserChuck said:

With the blanket of warming that has happened all over the globe in the last 20 years, I think we can upgrade all climo stats to lower pressureskew these days. Maybe a whole category. In other words, Cat 3 = Cat 4, etc. Plus this is one the best looking hurricanes in the beginning stages maybe ever.

Perhaps, all other variables being held constant. I haven't seen literature where this issue is examined in great detail. Research is probably ongoing.

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2 hours ago, ncforecaster89 said:

Actually,  it's officially another 20 knots needed to attain category-five intensity (140 knots/157 mph).  

Have you ever seen an advisory state a hurricane's wind velocity in anything other than 5mph increments? And if so, when? I ask only because I've been a weather geek longer than you've been alive and don't ever recall it being done. Not saying it's never happened, only that I have no recollection of it ever being done.

I bring this up because the knot to mph conversion does not often fit that 5mph-stepped advisory convenience. If a hurricane was measured at precisely 140kts, would the public advisory round that off, not to the nearest 5mph step of 155 but upward to the 5mph step of 160 that meets Cat 5 criteria?

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5 minutes ago, Hazey said:

Turks and Caicos island are going to be in trouble. Might get in the strongest part of the storm on projected track.

The northern islands are less than 36 hours away from the brunt and should be of immediate concern if it doesn't gain some latitude tomorrow and even then it's going to be really close.

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