General Discussion >> Hurricane Ask/Tell

Jump to first unread post. Pages: 1
lunkerhunter
Storm Tracker


Reged: Fri
Posts: 248
Loc: Saint Augustine, FL
Small Paula Likely to stay south of Florida
      #89895 - Thu Oct 14 2010 03:03 PM

why the large divergence between the NHC track and the models?

(Post moved to a more appropriate Forum.)

Edited by Ed Dunham (Fri Oct 15 2010 12:08 AM)


Post Extras: Print Post   Remind Me!   Notify Moderator  
Ed DunhamAdministrator
Former Meteorologist & CFHC Forum Moderator (Ed Passed Away on May 14, 2017)


Reged: Sun
Posts: 2565
Loc: Melbourne, FL
NHC Forecast Vs Model Output [Re: lunkerhunter]
      #89898 - Fri Oct 15 2010 12:27 AM

One is a forecast - the models are guidance to consider in making the forecast. In this case however, the 11PM discussion indicates that the NHC forecast is generally close to the middle of the significantly spread model guidance package and very close to the TVCN (Consensus output). From NHC:

"VERTICAL WIND SHEAR IS FORECAST TO INCREASE...WHICH
SHOULD CAUSE THE LOW- AND UPPER-LEVEL CIRCULATIONS TO DECOUPLE . THE
RESULTANT SHALLOW LOW-LEVEL REMNANT CIRCULATION IS EXPECTED TO BE
BE FORCED SOUTHWARD BY A LARGE SURFACE HIGH PRESSURE RIDGE THAT IS
CURRENTLY BUILDING ACROSS THE GULF OF MEXICO...FLORIDA... AND THE
NORTHWESTERN BAHAMAS. THE OFFICIAL FORECAST TRACK IS SIMILAR TO THE
PREVIOUS ADVISORY TRACK...AND IS IN THE MIDDLE OF THE VERY
DIVERGENT NHC MODEL GUIDANCE."

The models assume that the system will remain intact - I don't think that they can determine (or handle) a decoupled system with any degree of reliability. While it is certainly true that the models have improved significantly over the past decade, it is also true that the meteorologist can recognize certain probable events that the automated system cannot.
ED


Post Extras: Print Post   Remind Me!   Notify Moderator  
Pages: 1



Extra information
0 registered and 0 anonymous users are browsing this forum.

Moderator:  CFHC, Ed Dunham, Colleen A., danielw, Clark, RedingtonBeachGuy, Bloodstar, tpratch, typhoon_tip, cieldumort 

Print Topic

Forum Permissions
      You cannot start new topics
      You cannot reply to topics
      HTML is disabled
      UBBCode is enabled

Rating:
Topic views: 3556

Rate this topic

Jump to

Mobile Home - Login - Normal Flhurricane Site
This is NOT an official page. It is run by weather hobbyists and should not be used as a replacement for official sources.
Generated May 4, 2024, 2:01:47 PM EDT
When in doubt, take the word of the National Hurricane Center