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KMD 250 Pilot's Guide
Section 2
FIS Operation
Basic Service Weather Products
Rev 4 Aug/2007
10. Turbulence (may not always be present)
11. Icing (may not always be present)
12. Remarks (may not always be present)
PIREPs available within the selected range of the selected area will be
displayed up to a maximum of 25 reports. These reports are displayed
in an encoded textual format.
NOTE: PIREPs older than 120 minutes are discarded.
See the section on Understanding Textual Aviation Weather Reports, for
instructions on decoding textual PIREPs.
AIRMET
An AIRMET (Airman’s Meteorological Information) is an advisory of
significant weather that could be hazardous to single engine, light aircraft
and VFR pilots. However, parameters are such that the phenomena
does not require issuance of a SIGMET. AIRMETs address details
regarding IFR, extensive mountain obscuration, turbulence, strong sur-
face winds, icing and freezing levels. AIRMETs are considered wide-
spread because they must either be affecting or forecast to affect an
area at least 3,000 square miles. However, during the forecast period,
the actual affected area may be much smaller. AIRMETs are issued
every six hours and the maximum forecast period is 6 hours. An
AIRMET will contain elements in the following order:
1. Forecast Area
2. Report Type
3. Date and time issued
4. Report designation and reason for issuance
5. Validity period
6. Area of coverage
7. Weather phenomenon details.
These reports are displayed in an encoded textual format.
NOTE: AIRMETs may be issued up to 15 minutes prior to the start of the
validity period. The system will display the data age as zero until the start
of the validity period. AIRMETs older than 360 minutes are discarded.
Amended or corrected AIRMETs generated within the issuance period
are provided as soon as they are available, and the previous outdated
AIRMET is no longer transmitted.
When an AIRMET is cancelled, neither the original report nor the cance-
lation message can be displayed.
KMD 250 FIS_R4 8/13/07 10:07 AM Page 2-10