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24 hours surface weather chart

Asked by: 4013 views Commercial Pilot, Flight Instructor, General Aviation, Instrument Rating, Private Pilot

Hi everyone!

Maybe someone can help me with this problem. I always get confused with the 24 hr surface forecast chart.

For example, if you have the following notation:

"VT 1200 Z  23 Feb 2014"  => does that mean...

a) that the depicted weather will appear "in 24 hrs" from the VALID TIME & DATE -> ~ 1200Z on the 24th?

OR

b) that the depicted weather will appear "from the VALID TIME & DATE" -> 1200z  on the 23th, and that these conditions will persist for the next 24 hours from the valid time, so until 1200Z the next day?

Thank you!

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1 Answers



  1. Tim on Feb 22, 2014

    Both answers not right. Validity time 12z 23 feb means: that is the expexted wx situation only at the time 12z 23 februari!

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