Severe Weather Avoidance Plan
A coordinated plan that reroutes air traffic around areas of severe weather affecting normal flight paths.
What is SWAP?
A Severe Weather Avoidance Plan (SWAP) is activated when severe weather (typically large thunderstorm systems) blocks major air traffic routes. The FAA coordinates with airlines to establish alternate routes around the weather, creating organized traffic flows that avoid the dangerous areas. SWAP routes may add significant distance and time to flights but are safer than attempting to navigate through severe weather.
Common Causes
- Large thunderstorm complexes
- Squall lines blocking routes
- Widespread convective activity
- Hurricane or tropical storm impacts
- Severe turbulence areas
Impact & Duration
Impact Level
Medium to High - Flights reroute around weather, adding 30 minutes to 2+ hours
Typical Duration
4-12 hours as weather systems move through the region
Frequently Asked Questions
Why does my flight take a longer route during SWAP?
SWAP routes detour around dangerous weather. While longer, these routes are much safer than flying through severe thunderstorms which can cause extreme turbulence, hail damage, and other hazards.
How much extra time does SWAP add to flights?
Depending on the size and location of the weather system, SWAP reroutes can add anywhere from 30 minutes to 2+ hours to your flight. Transcontinental flights are often most affected.
Related Terms
Weather Impact Levels
FAA classifications indicating how weather conditions are affecting airport operations.
Airspace Flow Program
An FAA program that manages traffic through specific areas of airspace affected by weather or congestion.
Temporary Flight Restriction
An FAA-imposed restriction that temporarily limits or prohibits aircraft operations in specific airspace.
Check for Active Delays
See if any airports currently have this type of delay active.
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