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ASN Visibility Interpolation

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Hello Guys, My ASN is having trouble interpolating visibility. No matter what setting I use I get a visibility of  9.0 SM (9999+ m). I set maximum surface visibility to 8SM and it only applies to stations that have active or current weather metars, but for other stations that are fully interpolated by ASN the visibility is always  9.0 SM (9999+ m). everything else works perfectly. Example.

 

DNMM 171036Z 09304KT 9999 NOSIG 32/16 Q1013 RMK ADVANCED INTERPOLATION
 
Decoded textual weather for DNMM
 
Wind: 093 at 4 knots 
Visibility: 9.0 SM (9999+ m)
Clouds: None Reported
Temperature: 32.0C
Dewpoint: 16.0C
Precipitation: None reported
Altimeter: 1013 mb (29.92 inches)
 
Surface winds calculated from the closest data grid point
 
Surface temps calculated from the closest data grid point
 
Visibility interpolation based on:
  -DBBB 58nm SW (2000), DXSK 194nm NW (5000)
Altimeter interpolation based on:
  -DBBB 58nm SW (Q1013), DXNG 233nm NW (Q1018)
Precipitation based on extended grid weather data
 

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