Current Radar or Satellite Image

Flhurricane.com - Central Florida Hurricane Center - Tracking Storms since 1995Hurricanes Without the Hype! Since 1995


Watching a 20% area in the Gulf of Mexico. Development chances may increase depending on what EPac TS Agatha does.
Days since last H. Landfall - US: Any 256 (Nicholas) , Major: 271 (Ida) Florida - Any: 1325 (Michael) Major: 1325 (Michael)
 


General Discussion >> Hurricane Ask/Tell

ClarkModerator
Meteorologist


Reged: Wed
Posts: 1710
Dropsonde wind profile conversion table
      Thu Aug 24 2006 12:36 PM

In case anyone finds it useful when decoding recon data and trying to get an estimate for what it means at the surface, here's a table of dropsonde conversion factors based off of various heights. Just multiply the observed wind at that height and you'll get a surface observation. Note that these are the mean conversion factors; not all hurricanes will fit this mean profile and there are extreme cases where the standard conversion ratios can be off by 10-20% in either direction. Low-level invests are typically flown around 1000ft or 850mb; normal recon flights are flown around 700mb.

The graph which this is based off of may be found at http://www.nhc.noaa.gov/aboutwindprofile.shtml.

For the eyewall/inner core...
700mb -- 0.91
3000m -- 0.98
2500m -- 1.04
2000m -- 1.06
1500m -- 1.10
850mb -- about 1.12
1000m -- 1.16
500m -- 1.21
1000ft -- 1.20

In the outer vortex, these conversion factors become...
700mb -- 0.78
3000m -- 1.01
2500m -- 1.04
2000m -- 1.05
1500m -- 1.08
850mb -- about 1.08
1000m -- 1.09
500m -- 1.04
1000ft -- 1.00

--------------------
Current Tropical Model Output Plots
(or view them on the main page for any active Atlantic storms!)

Post Extras Print Post   Remind Me!     Notify Moderator


Entire topic
Subject Posted by Posted on
* Dropsonde wind profile conversion table ClarkModerator Thu Aug 24 2006 12:36 PM

Extra information
0 registered and 10 anonymous users are browsing this forum.

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



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

Rating:
Thread views: 4058

Rate this thread

Jump to

Note: This is NOT an official page. It is run by weather hobbyists and should not be used as a replacement for official sources. 
CFHC's main servers are currently located at Hostdime.com in Orlando, FL.
Image Server Network thanks to Mike Potts and Amazon Web Services. If you have static file hosting space that allows dns aliasing contact us to help out! Some Maps Provided by:
Great thanks to all who donated and everyone who uses the site as well. Site designed for 800x600+ resolution
When in doubt, take the word of the National Hurricane Center