[wxqc] findu.com barometric pressure display issue

[Evan Bookbinder]

Thomas,

A diurnal change of 5mb in New England in summer is certainly not rare, 
especially considering several weather systems responsible for rain and 
severe weather have passed through the region in the last couple of 
days.  I checked several surrounding official reporting stations at area 
airports across MA, CT and RI...all of them show the same pressure fall 
and spike during the afternoon/evening of the 28th, associated with a 
squall line that produced 50+ mph winds.

Evan

Thomas Hybiske wrote:
> Has anyone checked their wx page recently on findu.com?  I hope I can 
> explain this correctly because I don't know much about the system: 
>  
> The problem pertains to the display of the barometric pressure.  
> Looking at the displayed graph, it would appear there are gross swings 
> in pressure. In my case, my station shows a 5 millibar change in a 
> matter of hours; something that did not happen in the dog days of 
> summer here in New England.  I first suspected a device problem at my 
> station, but my Weatherlink display showed a nearly smooth pressure 
> line as expected.  Then I looked at other stations and observed gross 
> swings in pressure at their stations as well.  So I then went back and 
> looked at my "quality control graph" for my station and I think I've 
> discovered the problem.  It appears that the graph line has been 
> "magnified" and layed down onto an incorrect graph range.  In other 
> words the graph line represents minute changes in pressure, but is 
> being tracked on a grid for a much wider range of pressure.  Maybe a 
> tenth of a millibar is being traced as one millibar. I noticed this 
> began sometime late last week.  Can someone confirm this for me?  
> Here's my station address for reference:  
> http://www.findu.com/cgi-bin/wxpage.cgi?call=K3gm&last=120 
> <http://www.findu.com/cgi-bin/wxpage.cgi?call=K3gm&last=120>
>  
> Thanks,
> Tom Hybiske, K3GM
>
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-- 
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Evan Bookbinder - WX2CHS
Senior Meteorologist
National Weather Service
WFO Kansas City/Pleasant Hill, MO

Evan.Bookbinder at noaa.gov
816-540-6125
http://weather.gov/kc
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