Avalanche
Continued exposure to low or rapidly falling temperatures.
Rapidly, almost continuously.
swiftly rapidly
A tornado forms
a mass of snow, ice, and rocks falling rapidly down a mountain side
A falling pressure on the barometer indicates bad weather approaching, especially if falling rapidly
It means fast, quickly, or rapidly.
Continued exposure to low or rapidly falling temperatures
continued exposure to low or rapidly falling temperatures
a mass of snow, ice, and rocks falling rapidly down a mountain side
Continued exposure to low or rapidly falling temperatures
a storm is approaching