Janet - the interior Minister's instruction to stay in was meant for people tonight overnight to stay out of the way of the firemen/electrical workers/ rescue workers who will inevitably be out making roads passable, restoring electricity, helping injured persons - and creating less work for them. You can reassure your friend he didn't mean that people in Paris need to stay in during the day.
(The orange alert for Ile de France for high winds currently is scheduled from midnight tonight through 6am.)
Paris parks, gardens and cemeteries will be closed tomorrow (this is a regular precaution during wind storms).
Guidance from the city of Paris is here (run through Google translate if necessary)
https://www.paris.fr/pages/risque-de-vents-violents-a-paris-25294?ttt
A couple of updates this evening:
In addition to the 3 départements under red alert, there are now 30 départements under orange alert for violent winds - including the Paris area.
The SNCF has pre-emptively decided not to run some portion of the RER A tomorrow morning, along with some Transilien (suburban Paris) trains.
Winds in the Paris area are projected to get up as high as 60 miles an hour.
Of course the northwestern coastal areas are by far under much more danger. Thinking of our Forum pals in Normandy and Brittany, or other points north and west (including Jersey and Guernsey)