Hi,We have seen this CAVOK many times and have seen it defined as Ceiling and Visibility OK. Is there an

"Ceiling And Visibility OK": No CB, no cloud with base less than 5000ft or below the highest minimum sector altitude, whichever is greater & visibility 10km or more & no weather of 'significance' i.e. DZ, RA, SN, SG, PL, IC, GR, GS, FG, BR, SA, DU, HZ, FU, VA, PO, SQ, FC, DS, SS ... and variants.

Hi,From the ASV Weather Guide:Although not used in US, Ceiling And Visibility OK replaces visibility, weather and clouds if: visibility >=10km;no cloud below 5000 ft (1500m) or below the highest minimum sector altitude, whichever is greater and no CB;and no precipitation, TS, DS, SS, MIFG, DRDU, DRSA, or DRSN.Is it possible to see clouds when CAVOK is reported?? YES it is!!Hope this helps,JimActiveSky Sales and Supporthttp://www.hifisim.com/images/asv_dev_team.jpg http://www.hifisim.com/images/asv_proud_supporter.jpg

Thanks,I did a search of the ASV Weather Guide looking for CAVOK but I it is not there but your definition is.