Here are the possible solutions for weather phenomenon or this puzzle's theme clue
Answer
Clue
Relevancy
airmass
Clue
Weather phenomenon, or this puzzle's theme
tstorm
Clue
Loud weather phenomenon, as shortened in weather reports
coolingcenter
Clue
Hot weather refuge, and this puzzle's theme
fivedayforecast
Clue
Weather Channel feature (it's the puzzle theme found in a quintet of answers)
info
Clue
Theme word inside this puzzle's theme words
Definition
(short for) information
lllllllllllllllllllll
Clue
Much of the Smurfs' theme song, and this puzzle's theme
rawhide
Clue
Classic TV theme song covered by this puzzle's theme duo
Definition
to beat with a type of whip
four
Clue
Number of times this puzzle's theme word appears diagonally in the grid (to complete the puzzle, shade those words plus the Down answers that begin where they meet)