KenHamer:

You are talking about an Air Florida 737 that crashed into the Potomac after takeoff from DCA. There was a snowstorm, and the captain had used reverse thrust to back-out the aircraft-something which is grossly illegal with the 737 under those conditions. The engine thrust controls malfunctioned, and the plane stalled and crashed after takeoff.

So if the pilot uses reverse thrust in a snowstorm--beware!!!