-> errrmmm... your barometer also isn't located where their barometer is  
-> located... it is entirely possible for them to be experiencing a rise in  
-> pressure while you experience a drop in pressure... stop twiddling... find o 
-> what the pressure actually in your locale within 20 miles (for instance), se 
-> it to that and let it go...  
   
The weather data for Toronto is collected at Pearson Airport, which is  
only about 15 kilometres (less than 10 miles) from my house. For  
practical purposes, my barometer IS located at the same place as  
theirs.  
   
-> an example of similar nature... we watch a TV station that is located some 6 
-> miles away... our cold temperature is generally 5 degrees lower than what th 
-> project and/or report their's to be... i don't remember about our hot  
-> temperature but i think it is about the same offset higher... the reason thi 
-> is is because their readings are taken at the airport (RDU Int'l) or their  
-> station facilities building (in the city) whereas we are located in a slight 
-> valley in rural, hilly country with a lot of trees and streams around  
-> us...  
   
Generally speaking, temperatures vary far more over short distances  
than does barometric pressure. I live very close to the shore of Lake  
Ontario, which acts as a huge heat source/sink. In summertime, our  
temperatures are usually at least a couple of degrees (Celsius) lower  
than the ones a few kilometres inland. In wintertime, the reverse is  
true.  
   
But, apart from altitude, which is supposed to be compensated for by  
twiddling the adjustment screw, local factors don't have much effect on  
barometric pressure. It's rare for there to be a pressure gradient  
steeper than about 0.2 kPa per 100 km, so the distance between here and  
the airport shouldn't produce a difference more than about 0.03 kPa,  
which is close to the limit of readability of my barometer anyway.  
   
Oh well... It's really just a toy. Nobody relies on a barometer to  
predict the weather any more.  
   
                          dow  
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