For infrequent, short use (coastal cruising), the author recommends selecting a second-hand jib from a smaller boat as an emergency storm jib.
A sailmaker offers a formula for choosing the size of your storm jib based on the size of the foretriangle, the expected conditions, and the strength of the crew.
Setting a storm jib over a furled genoa or on a staysail stay without running backstays to support it are both dangerous in harsh conditions. This firm proposes an emergency stay that has good mast and deck support and good luff tension.
Brief but useful summary of the design, rigging, and use of the storm jib and storm trysail.
A sailmaker comments on the Gale Sail and describes an unusual concept of hoisting a storm jib on two halyards terminating at the same height on the mast. Advantages include better location of the sail and less time spent on the bow rigging it.