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» Online Classroom   »   » Public Discussion of Marine Weather   » Fog, Dew Point, & RH

   
Author Topic: Fog, Dew Point, & RH
SRF


 - posted November 05, 2008 04:03 PM      Profile for SRF           Edit/Delete Post 
If I know the dew point and check the outside air temperature, I can determine presence or absence of fog. But usually all that I get from the forecasts is relative humidity. I am not sure how to move back and forth between dew point and relative humidity.
David Burch


 - posted November 05, 2008 07:25 PM      Profile for David Burch           Edit/Delete Post 
These topics are discussed in section 3.5 of the text, along with tables of converting between RH and DP, using the wet bulb temperature to make the transition between them.

Alternatively, you can also calculate DP from RH, using pressure and temperature, from this link:

http://www.srh.noaa.gov/epz/wxcalc/wxcalc.shtml

From: Starpath, Seattle, WA


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