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CHAPTER THREE
METEOROLOGY FLIGHT PLANNING
WAUS1 KDFW 210745
DFWS WA 210745
AIRMET SIERRA FOR IFR AND MTN OBSCN VALID UNTIL 211400
AIRMET IFR...TN KY
FROM 30E TRI TO 20S CHA TO 40SW ABY TO MOB TO IGB TO MEM TO DYR TO 30E TRI
OCNL CIG BLW010/VIS BLW 3SM -RA/BR. CONDS SPRDG EWD AND CONTG BYD 14Z AND IMPVG
EXC ERN TN BY 20Z.
AIRMET MTN OBSCN...TN KY
FROM HNN TO 30E TRI TO 30E CHA TO CHA TO HNN
MTNS OCNL OBSCD IN CLDS/PCPN/FG. CONDS CONTG BYD 14A THRU 20Z.
DFWT WA 210745
AIRMET TANGO FOR TURB VALID UNTIL 211400
AIRMET TURB...AR OK TX TN MS LA AND CSTL WTRS
FROM 40S ICT TO ARG TO 20S BWG TO 80S LCH TO LRD TO 40S ICT
LGT OCNL MDT TURB FL140-FL350 ASSOCD WTH STG WNDSHR. CONDS CONTG BYD 14Z IMPVG
BY 20Z.
ELSW...NO SGFNT TURB EXC VC CNVTV ACT
DFWZ WA 210745
AIRMET ZULU FOR ICE AND FRZLVL VALID UNTIL 211400
AIRMET ICE...TN MS OK
OCNL LGT ISOLD MDT RIME ICGICIP FRZLVL TO ARND 120 MS AL AND TN. CONDS CONTG
BYD 14Z IMPVG BY 20Z.
Figure 3-7 WA Example
AIRMET bulletins, each containing one or more AIRMET messages, are issued on a scheduled
basis every six hours beginning at 0145 UTC, and are effective for six hours, beginning at 0200
UTC. Unlike FAs, scheduled AIRMET bulletin issuances occur at the same UTC time, regardless
of their area designator (Figure 3-7). Unscheduled amendments and corrections are issued as
necessary, due to changing weather conditions or issuance/cancellation of a SIGMET.
There are three types of AIRMET messages that may be issued within a WA. An AIRMET is
issued when one or more of the following listed conditions occurs (or is expected to occur) and
affects an area of at least 3000 square miles:
AIRMET Sierra For widespread IFR conditions (ceilings less than 1000 feet and/or visibility
less than three miles) affecting over 50% of the area or for extensive mountain obscuration.
AIRMET Tango For moderate turbulence or for sustained surface winds of 30 knots or more.
AIRMET Zulu For moderate icing or freezing level data.
3-14
SEVERE WEATHER WATCHES, MILITARY ADVISORIES, AND PIREPS


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