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KMD 250 Pilot's Guide
Section 2
FIS Operation
Rev 4 Aug/2007
/WX: Weather Phenomenon (can include flight visibility, precipitation
and restrictions to visibility.
/TA: Outside air temperature at altitude in degrees Celsius.
/WV: Wind (direction in degrees magnetic north and speed in knots)
/TB: Turbulence (refer to the Airman’s Information Manual)
CAT - Clear Air Turbulence
CHOP - Choppy Turbulence
OCNL - Occasional
NEG - No Turbulence
ABV - Above
BLO - Below
LGT - Light - Momentarily causes slight, erratic changes in
altitude and/or attitude.
MOD - Moderate - Greater intensity changes in altitude and/or
attitude, but aircraft remains in positive control at all times.
Usually causes changes in indicated airspeed.
SEV - Severe - Causes large and abrupt changes to aircraft
altitude and/or attitude. Large variations in indicated airspeed
and momentary loss of control.
EXTRM - Extreme - Aircraft is violently tossed about and is
nearly impossible to control. May cause structural damage.
/IC: Icing (refer to the Airman’s Information Manual)
CLR - Clear
MX - Mixed (combination of rime and clear icing)
NEG - No Icing
ABV - Above
BLO - Below
Trace - Ice becomes perceptible. Rate of evaporation is
almost equal to the rate of accumulation. Deicing/anti-icing
equipment is not utilized unless encountered for a period of
time greater than 1 hour.
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.
Understanding Weather Reports
KMD 250 FIS_R4 8/13/07 10:07 AM Page 2-71