My wife just called to say that the windscreen wipers are frozen to
the windscreen. Its probably the result of some freezing rain, which
has been predicted for this part of New Jersey.
Can anybody suggest any way to unfreeze them, other than the obvious
run the engine and turn on the heat?

I read that you already got the wipers unstuck.

For the future, I wonder if you could prevent the problem in the first
place by parking the car in a garage or covering the windshield with a
tarp?

Just a thought...

Anthony

A method to 'prevent' the problem :

on some cars you can LIFT the wiper blades off the windshield during snow or
ice or at night

barring that, work the wipers til they are in the middle of the windshield and
turn off the car = easier to work them free vs being in a SOLID BLOCK of ice at
BASE of windshield here in New Jersey