This type of avalanche activity is most likely to occur when nighttime temperatures remain above freezing for several nights.
(This type of avalanche activity; is; most likely to occur) (This type of avalanche activity; to occur; T:when nighttime temperatures remain above freezing for several nights) (nighttime temperatures; remain; above freezing for several nights)
This type of avalanche activity This type of avalanche activity nighttime temperatures
is to occur remain
most likely to occur
T:when nighttime temperatures remain above freezing for several nights
above freezing for several nights