In-Flight Weather Information

INSTRUMENTS FLIGHT PLANNING

CHAPTER SEVEN

Performance characteristics of the aircraft permit an enroute flight altitude above existing

or developing severe storms.

NOTE

It is not the intent to restrict flight within areas encompassed by or

adjacent to a WW unless storms have actually developed as

forecast.

Training Command Weather Warning

A CNATRA Aviation Weather Warning is similar to a WW and MWA. However, this weather

warning pertains only to Navy Aviation Training Command bases. While at VT-10/4, you may

never file into a CAWW for any reason. It is issued, generally, in the absence of a National

Weather Service Weather Warning. These warnings apply to training command aircraft and

generally cover the same weather conditions as a WW or MWA. Needless to say, when a

CAWW is issued, you should examine all aspects of your route of flight before T/O, just as you

would for a WW or MWA.

If you file a flight plan at a base other than a CNATRA field, a CAWW forecast may not be

available or briefed. If there is any chance of severe weather on your flight, check with NAS

Pensacola via Defense Switched Network (DSN) to determine if a CAWW is in effect.

704.

IN-FLIGHT WEATHER INFORMATION

AIRMET

In-flight weather advisories consist of two types: the AIRMET (WA) and the SIGMET (WS or

WST). Since AIRMETs apply to lighter aircraft, they are issued to cover moderate, potentially

hazardous weather. This includes the following:

Moderate icing.

Moderate turbulence over an extensive area.

3. Extensive areas where visibilities are less than 3 miles and/or ceilings are less than 1000

feet, including mountain passes.

SIGMET (Convective and Nonconvective)

SIGMETs apply to all types of aircraft and are issued to cover the more severe types of weather.

Convective SIGMETs cover the following:

Tornadoes

Line of thunderstorms

Hail of inch or more in diameter

IN-FLIGHT WEATHER ANALYSIS 7-5