Question

which condition would most likely require the national weather service to issue a severe thunderstorm warning? (1 point)
○ a front moving out of an area
○ a meeting of two air masses with major differences in temperature and moisture
○ an air mass developing over a large body of water
○ a large amount of moisture in the air condensing to form clouds

Explanation:

Severe thunderstorms often form when two air - masses with significant differences in temperature and moisture meet. This creates instability in the atmosphere. Option 1 (a front moving out) doesn't directly indicate severe thunderstorms. Option 3 (air - mass over water) doesn't necessarily lead to severe thunderstorms. Option 4 (moisture condensing to form clouds) is a part of cloud - formation but not enough for a severe thunderstorm warning.

Answer:

a meeting of two air masses with major differences in temperature and moisture