Over 1C a jump to 3D shows a moderately good club raise and a jump to 3H shows a very good club raise.

Over 1D a jump to 3H shows a moderately good diamond raise

and a jump to 3S shows a very good diamond raise.

This is forcing to 3NT or to 4 of the minor.

H.W. Kelsey suggests that responder jumps in the suit in which he or she has the best stopper.