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re: Hurricane Florence - Catastrophic Flooding Potential

Posted on 9/10/18 at 11:28 am to
Posted by GetCocky11
Calgary, AB
Member since Oct 2012
53509 posts
Posted on 9/10/18 at 11:28 am to
quote:

GFS also has Isaac taking a northern turn now



I heard a guy call the GFS that "Garbage Forecasting System".

Is that the general feeling towards the GFS?
Posted by slackster
Houston
Member since Mar 2009
91837 posts
Posted on 9/10/18 at 11:28 am to
frick me.

12z GFS stalls Florence off the coast of NC at 102 hours, drifts her around 100 or so miles, then takes her into the central NC coast.

All the while the pressures are Cat 5 strength.
Posted by NYNolaguy1
Member since May 2011
21764 posts
Posted on 9/10/18 at 11:29 am to
quote:

Am I seeing a 905mb on that projection?!

What does that even correlate to as far as estimated wind speed?


For reference Katrina was 902mb at peak strength. So in essence a category 5 stalling off the coast over the gulf stream then slowly moving inland and giving someone a bad day.
Posted by Rox
Member since Oct 2010
33333 posts
Posted on 9/10/18 at 11:29 am to
Looking at the forecast models, Florence's rain would start around Friday and continue nonstop through Tuesday+.
Posted by DawgCountry
Great State of GA
Member since Sep 2012
33282 posts
Posted on 9/10/18 at 11:29 am to
quote:

Am I seeing a 903mb on that projection?!

What does that even correlate to as far as estimated wind speed?


178mph
Posted by Duke
Dillon, CO
Member since Jan 2008
36494 posts
Posted on 9/10/18 at 11:30 am to
905 is healthy in the five range. You'd expect 170ish from that pressure but that's definitely overdone. That's Katrina's max pressure and would smash the record for a pressure that low that far north.
Posted by slackster
Houston
Member since Mar 2009
91837 posts
Posted on 9/10/18 at 11:31 am to
quote:

12z GFS looks like a best case scenario with system just missing the Outer Banks and now drifting away. Start of a trend?


Remember when it looked like a best case scenario at 120 hours?

Posted by jefffan
Florence- Sumter- Columbia, SC
Member since Sep 2013
4971 posts
Posted on 9/10/18 at 11:31 am to
If you a direct line on I 77 and go east (basically from columbia Sc to NC/vs border) everything east of there is going to flood. Depending on south North track of storm.

I'm going to Augusta. Prob Thursday
Posted by tide06
Member since Oct 2011
23178 posts
Posted on 9/10/18 at 11:31 am to
So in other words we just went from very serious situation to a generational storm projection, is that a fair characterization?
Posted by ell_13
Member since Apr 2013
87965 posts
Posted on 9/10/18 at 11:32 am to
quote:

Florence's rain would start around Friday
Uh... Did you mean Wednesday?
Posted by DawgCountry
Great State of GA
Member since Sep 2012
33282 posts
Posted on 9/10/18 at 11:32 am to
as of now, yes
Posted by GetCocky11
Calgary, AB
Member since Oct 2012
53509 posts
Posted on 9/10/18 at 11:33 am to
I have to give the grocery stores credit. They're busting at the seams with water.
Posted by Flanders
Member since May 2008
9950 posts
Posted on 9/10/18 at 11:33 am to
quote:

Charlotte pucker factor at 6 but accelerating quickly. Seems like most people weren’t paying attention over the weekend but some eyes are being opened now.
Our corporate HQ recently relocated to Rock Hill, SC. Rainfall totals are looking ridiculous in the area.
Posted by deuce985
Member since Feb 2008
27660 posts
Posted on 9/10/18 at 11:33 am to
I wouldn't look at any one model man but no, it's not garbage. Euro and GFS are considered the most reliable. What you look at when you watch these runs on the computer models is how consistent they are on trends. You can sometimes just throw out runs as outliers and ignore them because 24 hours later they just align more with the others again. If you start seeing the other computer models like Euro do something similar then you start noticing trends because they're agreeing. You want them agreeing because that makes it less uncertain even if it's bad news for someone. Lots of probability in there. That said, GFS could be picking up on a trend before the other computer models so we'll just have to wait and see. As of now it's the outlier because the others are not agreeing with GFS...yet.

Posted by rt3
now in the piney woods of Pineville
Member since Apr 2011
147072 posts
Posted on 9/10/18 at 11:34 am to
quote:

158 mph winds found ~1800 feet above the surface. Those tend to cycle down over time.

just a FYI (not you slack... I know you know... but for others who don't)

104 kt winds at the surface is about 120 mph
Posted by 50_Tiger
Arlington TX
Member since Jan 2016
43447 posts
Posted on 9/10/18 at 11:36 am to
Last bit of GOES imagery showing expanding eye.
Posted by NYNolaguy1
Member since May 2011
21764 posts
Posted on 9/10/18 at 11:36 am to
Recon abt to make a pass through NE quadrant.
Posted by deltaland
Member since Mar 2011
102582 posts
Posted on 9/10/18 at 11:37 am to
quote:

Theres are posters on Dr Jeff Masters blog claiming recon found 130 mph winds at the surface already in the SW quadrant..


If true this one may be headed to Cat 5 status before it’s all set and done
Posted by Duke
Dillon, CO
Member since Jan 2008
36494 posts
Posted on 9/10/18 at 11:38 am to
quote:

So in other words we just went from very serious situation to a generational storm projection, is that a fair characterization?



Im of the mind it's kind of ridiculous but yes, would be a generational type storm if that played out.
Posted by slackster
Houston
Member since Mar 2009
91837 posts
Posted on 9/10/18 at 11:39 am to
quote:

905 is healthy in the five range. You'd expect 170ish from that pressure but that's definitely overdone. That's Katrina's max pressure and would smash the record for a pressure that low that far north.


Yeah, the max wind gusts on the GFS don't really jive with the 900-910mb pressure it's suggesting, but they're very dangerous nonetheless.

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