WW Issuing Requirements

METEOROLOGY FLIGHT PLANNING

CHAPTER THREE

WW Format

The heading of the Aviation Severe Weather Watch Bulletins consists of a few lines of

information including the station identifier of the message originator (KMKC), the teletype

identifier (WW), the date-time group of issue (181845), the bulletin number (29), and the time of

issue (1245 PM CST).

The bulletin is arranged in several paragraphs giving such information as the area of coverage, the

effective time of the watch, the expected type of severe weather, the mean wind vector, and any

amplifying remarks deemed necessary.

Whenever possible, wording in teletype presentations is shortened by abbreviating words or

phrases according to the FAA Contractions Manual. Omitting the vowels usually shortens words

or phrases. For further information on word or phrase contractions, refer to Appendix B of this

text.

WW Issuing Requirements

Aviation Severe Weather Watch Bulletins (Figure 3-1) are issued for two types of expected severe

weather conditions:

Funnel clouds or tornadoes.

Severe thunderstorms, defined by frequent lightning and one or more of the following:

50 knots of wind or greater;

3/4 inch diameter hail or larger

305.

MILITARY RESTRICTIONS REGARDING SEVERE WEATHER WATCHES

Since WWs restrict the operation of military aircraft, aviators should always first check for WWs when

beginning the flight planning process. Otherwise, you may plan a flight and find out during the weather

brief that you are unable to fly that plan.

SEVERE WEATHER WATCHES, MILITARY ADVISORIES, AND PIREPS

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