It is sad to me that so far there have only been two posts on this topic...but thanks for the 2 posts!
Regarding Severe Turbulence...airbubba is right, flight into known, reported, or forecast severe turbulence is not allowed.
HOWEVER at least 20 years or so ago, the US wx service started providing a forecast for : MOGR turbulence. This means: MODERATE OR GREATER turbulence. A semantic way around severe turbulence.
IF there is suspicion of turbulence ahead, the prudent captain will have seat belt sign illuminated, advise flight attendance to secure cabin for rough air and advise passengers to make sure they have their seatbelts on securely (tight) and to secure their carry on luggage. Suspension of cabin service is a good idea.
OF COURSE if it is smooth, everyone will complain about not getting a bag of nuts. (korean aside).
AT our airline about 17 years ago, a 737 was at cruise, sign illuminated, passenger disobeyed sign, went to restroom, SEVERE CLEAR AIR TURBULENCE. MAN BOUNCED OFF CEILING IN RESTROOM< broke spine and became paralyzed.
Damage to ceiling of plane extensive.
Other precautions should be taken in terms of aircraft systems ( speed, ignition etc...and I prefer use of PITCH hold in autopilot systems, or whatever you call it in your plane)
Watching for sudden changes in SAT may clue you into possible CAT ahead!