What weather sequence is typically associated with the passage of a fast-moving cold front?
AGradual improvement over many hours with steady stratiform precipitation.
BRapid deterioration with cumuliform clouds, heavy precipitation, possible thunderstorms, then rapid clearing behind the front.✓
CStratus clouds and steady drizzle for 24–48 hours followed by gradual clearing.
Why →Fast-moving cold fronts (20–60 mph) bring: pre-frontal cumuliform clouds, rapid and sometimes violent weather at the frontal boundary (heavy rain, thunderstorms, strong gusty winds), then rapid clearing with improved visibility and lower temperatures. The entire sequence can pass in hours.
The trap →Gradual improvement and steady precipitation describe a warm front, which is slow-moving and produces stratiform weather over extended periods. "Stratus and drizzle for 24–48 hours" is the warm front signature, not cold.
Field note →Cold fronts offer a planning opportunity: an hour or two after passage, conditions often turn ideal, with excellent visibility, lower humidity, and stable air. The dangerous window is the passage itself.
SOURCE → PHAK Chapter 12, Weather TheoryCHECKED JUL 16ACS III.B.K1MED