This ty pe of avalanche activity is most likely to occur when nighttime temperatures remain 
(This ty pe of avalanche activity; is; most likely to occur) (This ty pe of avalanche activity; to occur; T:when nighttime temperatures remain) (nighttime temperatures; remain; )
This ty pe of avalanche activity This ty pe of avalanche activity nighttime temperatures
is to occur remain
most likely to occur
T:when nighttime temperatures remain