Definition
An alphanumeric weather message issued by the National Weather Service to warn of the possible development of tornadoes, large hail, damaging surface winds, or severe thunderstorms within a defined area during a specified time period. Identified by the abbreviation WW, it is distributed in advance of the hazardous weather and is updated or canceled as conditions evolve.
Plain English
A weather message that tells pilots a defined area may see severe storms, tornadoes, hail, or strong winds during a stated time window so they can plan around it.
Context Anchor
Pilots may see this during a weather briefing, before departure, or while checking weather along a planned route.
Derivation
‘Watch’ here is used in the meteorological sense — conditions are favorable for severe weather, but it is not yet occurring. This is distinct from a ‘warning,’ which means severe weather is happening or imminent.
Why Pilots Care
Allows pilots to anticipate potential hazards and adjust flight plans accordingly to maintain safety.
Grounding Statement
A watch area is not a guarantee of severe weather, but it is a clear signal that the atmosphere is ready for dangerous storms to form.
Intuition Check
Do not read “watch” as meaning the severe weather is already over the airport. In this use, “watch” means the conditions are favorable and pilots need to stay alert for development.
Example Sentence 1
During his preflight briefing, the pilot noted a Severe Weather Watch Bulletin covering the western half of his route and chose to delay departure by two hours.
Example Sentence 2
Air traffic control referenced the Severe Weather Watch Bulletin when rerouting traffic around the affected area.