“Long River radio, this is Birdman 621. I’m on a VFR flight plan between
Centreville and Blanktown. I’ve got a PIREP for you. Turbulence is pretty bad, the
visibility is dropping quite a bit and clouds are low in places. Looks like I’ll be
a little late on my ETA.”
What is this pilot trying to say? It is obvious that he gave little useful
information, even with all his good intentions. Where is he? What’s his altitude?
How much turbulence is there? What’s the vis and cloud base? Why is his ETA off?
PIREPs are the only direct source of information on cloud heights, turbulence,
visibility, winds, icing, etc, between weather reporting stations and at some airports.
They are particularly important on flights below 10,000 feet. If they contain
reasonably precise information, they are valuable to flight service specialists,
controllers, weather briefers and forecasters — and of course, to other pilots.
There are several observation items which are valuable, such as outside air
temperature, cloud types, bases and tops, thunderstorm activity and visibility
restrictions. But even more important are conditions which are worse than forecast,
and you should be able to describe them adequately. Here are some definitions relating
to turbulence and icing, to demonstrate what we mean.
Turbulence
Light — turbulence that momentarily causes slight, erratic changes
in altitude and/or attitude. Occupants may feel a slight strain against seat-belts or
shoulder straps.
Moderate — turbulence that is similar to Light Turbulence but of
greater intensity. Changes in altitude and/or attitude occur but the aircraft remains
in positive control at all times. Occupants feel definite strains against seat-belts.
Severe — turbulence that causes large, abrupt changes in altitude
and/or attitude. It usually causes large variations in indicated airspeed. Occupants
are forced violently against seat-belts or shoulder straps.
Icing
Light — The rate of accumulation may create a problem if flight is
prolonged in this environment.
Moderate — The rate of accumulation is such that even short
encounters become potentially hazardous, and use of de-icing equipment or diversion
is required.
Severe — The rate of accumulation is such that de-icing or
anti-icing equipment fails to reduce or control the hazard. Immediate diversion is
necessary.
Take an additional five minutes to review A.I.P. MET Section 2.0. For in-flight
guidance, remember that the recommended contents of a PIREP are listed on the back
cover of your Canada Flight Supplement (CFS).
One day, your PIREP could save someone else’s life ...
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