[NLRS] Da' bouys

[Jon Platt]

This holds some promise ..... note that the air temp sensor is 4m above the
water ..... a "duct" for 10Ghz needs to be about 30' thick or so, so this
may place the temp sensor near the middle of any possible duct.   I wish we
also knew the air temp at 100' above the water too.   Does it provide dew
point ?

Donn, several years ago I put together an Excel spread sheet that calculates
change in refraction index given air temp, air pressure (height), and dew
point data from NWS balloon data .... in theory it can be used to model
ducting over Lake Superior if you make some assumptions about what is going
on.   It would be interesting to talk to someone knowledge in Lake weather
to discuss what is going on in the first 50' above the Lake with regard to
air temperature and dew points when the land air is say 75 degrees, etc.
In theory refraction increases with warm dry air over cool wet air ..... how
cool, and how wet, is the question and that is where the modeling can come
into play.

73, Jon
W0ZQ


----- Original Message -----
From: "S. Earl Jarosh" <earl@jarosh.org>
To: <nlrs@mailman.qth.net>
Sent: Tuesday, March 11, 2003 4:14 PM
Subject: [NLRS] Da' bouys


Donn and Jon,

I thought y'all might find this useful after our discussion last Saturday.
http://www.ndbc.noaa.gov/Maps/WestGL.shtml

S. Earl Jarosh (ex. Steve?)
N0HZ  (ex. KA0VYB) No Hertz, No Gain
612-868-1313
earl@jarosh.org
earljarosh@moneycenters.com
www.moneycenters.com


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