A-8
Revision 6 Feb/2009
LGT
- Light - Rate of accumulation may be a problem if flight
is prolonged for longer than 1 hour without deicing/anti-icing
equipment. Deicing/anti-icing removes and/or prevents accu-
mulation.
MOD
- Moderate - The rate of accumulation is such that even
short encounters become potentially hazardous. Use of
deicing/anti-icing equipment or diversion is necessary.
SEV
- Severe - Flight diversion is necessary. Deicing/anti-
icing equipment is not effective.
/RM
: Remarks (for reporting elements not included or to clarify pre-
viously reported items). Remarks can include anything. The
example translates to “moderate (
MDT
) mixed (
MXD
) icing during
climb (
DURGC
) from Roanoke, VA (
KROA
) northwestbound
(
NWBND
) between Flight Level 080 and 100 (
FL080100
) at
1750Z
”.
UNDERSTANDING AIRMETS
The following is an example of a typical AIRMET with an explanation of
the elements.
1.
Forecast Area:
CHIT
This is the forecast area identifier of the issuing Weather Service
Forecast Office.
BOS
Boston
CHI
Chicago
DFW
Dallas/Ft. Worth
MIA
Miami
SFO
San Francisco
SLC
Salt Lake City
The
T
denotes the reason for the AIRMET. This could be one of the
following:
KMD 550/850 FIS Addendum
Appendix A
Understanding Weather Reports
CHIT WA 151900 AMD
AIRMET TANGO UPDT 2 FOR TURB
VALID UNTIL 160100
AIRMET TURB...KS MO
FROM MCI TO STL TO SGF TO ICT TO MCI
MOD TURB BLW 100 EXPCD
CONDS IPVG AFT 160000Z
1
3
4
5
2
6
7
8
9
10