Arianespace Chief Executive Officer Jean-Yves Le Gall announced the hold approximately 20 minutes before today's early morning scheduled lift-off time.
The Rosetta launch time is now planned at 04:36 local time (08:36 CET) on Friday 27 February.
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News Release
Rosetta launch delayed
Peer-Reviewed Publication
The weather hold was due to wind conditions at altitude, which are part of the safety considerations of each Ariane launch.
Both the Ariane 5G launch vehicle and its Rosetta comet-intercept payload have been put in a safe mode.