[wxqc] dew points (crash with onset of Santa Anna katabatic winds)

[LeRoy Lambert]

Perfect thanks

LeRoy

----- Original Message ----- 
From: "Dave Helms" <dshelms at comcast.net>
To: "Discussion of weather data quality issues" 
<wxqc at lists.gladstonefamily.net>
Sent: Tuesday, February 07, 2006 10:25 PM
Subject: Re: [wxqc] dew points (crash with onset of Santa Anna katabatic 
winds)


> Hey Leroy,
>
> Not to worry, just a case of the Santa Anna's (another example of 
> katabatic "downslope" winds) blowing in from the east!
> http://www.findu.com/cgi-bin/wxpage.cgi?call=CW4803&last=240
>
> On your station's time series, you can see the winds shifting around from 
> the southwest before February 5th to from the east more recently which 
> also was accompanied by plunging dew point from the 40's to the 20's at 
> the same time while your high temperatures jumped above 80F.  The dry air 
> produced by the Santa Anna winds moves in from east to west with the coast 
> last to see the dry air. Since the moisture distribution is not symmetric, 
> the analysis is not an ideal way of determining if your station is 
> producing accurate humidity measurements.   I advise you to ignore the 
> short term dew point/humidity analysis flags for now until the Santa Anna 
> conditions abate.
>
> Note that the Santa Anna winds are causing the NWS to issue "Red Flag" 
> warnings:
> http://fire.boi.noaa.gov/FIREWX/LAXFWFSGX.html
> http://fire.boi.noaa.gov/FIREWX/LAXRFWSGX.html
> ***A Fire Flag warning implies that conditions for wildfires are optimal, 
> e.g. low humidities, high winds, and/or "dry" lightning.
>
> More info on Santa Anna Winds:
> http://www.cnn.com/2006/US/02/06/wildfires.ap/?eref=yahoo
> http://www.atmos.ucla.edu/~fovell/ASother/mm5/SantaAna/winds.html
> http://en.wikipedia.org/wiki/Santa_Ana_wind
> http://meteora.ucsd.edu/cap/santa_ana.html
>
> Its important to note that your CWOP observations are used at the National 
> Interagency Fire Center through the MesoWest ROMAN system to help 
> anticipate wildfire behavior.
>
>
> Hope this helps,
>
> Dave
> CW0351
>
> LeRoy Lambert wrote:
>
>> */My station CW4803 red X on the dew point for the 3 day analysis period. 
>> Every station with in 15 miles has the same problem.  Stations KCNO, 
>> CW3917, KNOT, AD6NH, CW1226, and CW4333.  What's up with that?/*
>> *//* */LeRoy/*
>>
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