This product has an updated version. See it on the new page: Prog Charts

Mid Level SIGWX Charts
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    Issue Time Product Update  
  Button Valid at 00Z 08Z   06:50z 04/18  
  Button Valid at 06Z 14Z   12:46z 04/18  
  Button Valid at 12Z 20Z   18:55z 04/18  
  02Z   00:45z 04/18  
 
* If a correction to a Significant Weather chart is required ... a text
product will be issued under WMO FXUS65 KKCI or WMO FXUK65 EGRR.