[wxqc] Katabatic Wind Heat Spikes?

[Russ Chadwick]

In the first 12 hours of 1/13 UTC (last night) there are two different
cases of the "Chinook" winds (discussed below by Dave) and temperature
increases at my location NE of Boulder, CO.

http://www.findu.com/cgi-bin/wxpage.cgi?call=KB0TVJ-5!Boulder&last=48

Russ



-----Original Message-----
From: wxqc-bounces at lists.gladstonefamily.net
[mailto:wxqc-bounces at lists.gladstonefamily.net] On Behalf Of Dave Helms
Sent: Wednesday, January 11, 2006 6:54 PM
To: Discussion of weather data quality issues
Subject: [wxqc] Katabatic Wind Heat Spikes?


We see lots of sun spikes in stations with poor radiation shielding, but

sometimes you have to believe the data! 

Check out CW2749 in Loveland, Colorado:
http://www.findu.com/cgi-bin/wxpage.cgi?call=CW2749&last=72

On January 11th at about 4 UTC (10/22L), 12 UTC (11/06L), and 18 UTC 
(11/12L), there are three 20F degree rise and fall in temperature.  
Coincidently, there are three wind squals from the southwest with gusts 
over 30 mph.  Given that CW2749 is in the shadow of the Rocky Mountain 
front range, its a good bet this is a result of katabatic (downslope) 
warming,  aka  "Chinook" winds.

Dave
CW0351 

More on Katabatic Winds... http://www.blackhillsweather.com/chinook.html
http://wxpaos09.colorado.edu/windstorms/chinook.html



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