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Weather rapid changes in NYC area

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Did someone expirence rapid altimeter changes when approaching KJFK? I experiance it regularly, regardless the runway. The altimeter at KJFK reported by ATIS and in fact at JFK after landing is very different than even few miles before runway threshold. For example, ATIS gives me 30.15 when i am some 50 miles to the airport. But outside its 29.54. When 5-10 miles to the runway it is still around that and starts growing untill reaching 30.15 after landing... Obviously it makes you reach FAF, which is 1500 MSL, at around 600 radar altimeter. 
It happens to me only at JFK.

I am using P3D4.5 with REX Skyforce 3D, FSDT KJFK and ORBX.

Appreciate some advice!




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