Speci, Basic service weather products – BendixKing KMD 540 - Addendum System KMD 850 User Manual
Page 20
Revision 6 Feb/2009
KMD 550/850 FIS Addendum
7
2.
ICAO station identifier
3.
Date and time of issue
4.
Modifier (AUTO if automated report or COR if corrected observation)
5.
Wind
6.
Visibility
7.
Runway visual range (as required)
8.
Weather phenomena
9.
Sky condition
10. Temperature/dew point group
11. Altimeter
12. Remarks (as required)
METARs 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. METARs displayed graphically on the map
are offered through a subscription service.
NOTE: When a specific element of METAR data is not available, it is
omitted from the report. The user must know the sequence of data to
recognize omissions. METAR observations older than 120 minutes will
be discarded.
See Appendix A for instructions on decoding textual METARs.
SPECI
A SPECI (Aviation Selected Special Weather Report) is related to the
METAR. SPECIs are issued when certain specific conditions or events
have been observed at a particular location, usually an airport. A SPECI
will contain the same elements as a METAR and will generally be issued
for the following reasons:
1.
Sudden, extreme changes in wind speed and/or direction.
2.
Changes in surface visibility, especially those that change the flying
category at the reporting site.
3.
Changes in runway visibility above or below 2,400 feet.
4.
Appearance or termination of significant weather or natural atmos-
pheric events such as tornados, waterspouts, funnel clouds, thun-
derstorms, squalls and volcanic eruptions.
5.
Changes in precipitation intensity or form.
6.
Changes to ceilings when previously reported ceilings were at or
below 3,000 feet, or the formation of a ceiling below 3,000 feet.
Also, new formation of cloud layers or other obscuring phenomenon
that occur below 1,000 feet.
7.
Aircraft mishaps.
8.
Other meteorological conditions that the agency or the observer
determine as critical.
Basic Service Weather Products