Revision 6 Feb/2009
A-9
S Sierra IFR Ceilings < 1,000 feet and/or visibility
< 3 miles affecting > 50% of the area at
one time or extensive mountain obscu-
ration.
T Tango Turbulence Moderate turbulence, sustained suface
winds of ≥ 30 knots at the surface or
low level windshear.
Z Zulu Icing Moderate icing and/or freezing levels.
AIRMET items are considered widespread. Widespread is consid-
ered an area ≥ 3,000 square miles.
2. Report Type: WA
WA identifies an AIRMET.
3. Date and Time Issued: 151900
15 indicates the 15th day of the month. 1900 indicates UTC.
NOTE: AIRMETs may be issued up to 15 minutes prior to the start of the
validity period. The FIS system will display the data age as zero until the
start of the validity period.
4. AMD indicates an amended report. Reports can be amended due
to changing weather conditions or issuance/cancelation of a
SIGMET. COR in this field would indicate a corrected AIRMET.
RTD indicates a delayed AIRMET.
5. This line indicates that there is a second (2) update (UPDT) to this
AIRMET issued for turbulence (FOR TURB). More than one meteo-
rological condition may be addressed as shown in the following:
FOR IFR AND MTN (mountain) OBSCN (obscuration)
FOR ICE AND FRZLVL (freezing level)
FOR STG (strong) SFC (surface) WINDS AND LLWS (low level
wind shear)
6. This updated AIRMET is valid until 0100 UTC on the 16th day (16)
of the month. An AIRMET does not contain an explicit validity start
time.
7. This AIRMET forecasts turbulence (TURB) for the states of KS
(Kansas) and MO (Missouri). Geographic areas are also covered
such as CSTL WTRS (coastal waters). Other geographic abbrevia-
tions are used as well (see Appendix A).
8. The affected area is defined by lines FROM MCI (Kansas City) TO
STL (St. Louis) TO SGF (Springfield) TO ICT (Wichita) and back TO
MCI. Areas can be defined by lines between points which are air-
port or navaid identifiers.
KMD 550/850 FIS Addendum
Appendix A
Understanding Weather Reports
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