Leerjet 35/36 Developed for Training Purposes 5-35
February 1998
Flight Planning
Sample TAF
Aterminal aerodrome forecast (TAF) describes the forecast
prevailing conditions at an airport and covers either a 9-hour
period or a 24-hour period. Nine-hour TAFs are issued every
three hours; 24-hour TAFs are issued every six hours. Amend-
ments (AMD) are issued as necessary. A newly issued TAF
automatically amends and updates previous versions. Also,
many foreign countries issue eighteen hour TAFs at six hour
intervals.
The following example has detailed explanations of the new
codes.
KHPN 091720Z 091818 22020KT 3/4SM -SHRA
BKN020CB FM2030 30015G25KT 1500 SHRA
OVC015CB PROB40 2022 1/4SM TSRA OVC008CB
FM2300 27008KT 1 1/2SM -SHRA BKN020
OVC040 TEMPO 0407 00000KT 1/2SM -RABR
VV004 FM1000 22010KT 1/2SM -SHRA OVC020
BECMG 1315 20010KT P6SM NSW SKC
KHPN . ICAO location indicator. The usual 3 letter identifiers
we are familiar with are now preceeded by a K for the contigu-
ous United States. Alaska and Hawaii will use 4 letter identifiers
with PA and PH respectively. Changes are planned to incorpo-
rate alphabetic identifiers for those weather reporting stations
where numbers and letters are now used (e.g., W10 changed
to KHEF) .
091720Z. Issuance time. The first two digits (09) indicate the
date; the following four digits (1720) indicate time of day. All
times are in UTC or Zulu.
091818. Valid period. The first two digits (09) indicate the date.
The second two digits (18) are the hour that the forecast period
begins. The last two digits (18) indicate the hour that the fore-
cast expires. The example is a 24-hour forecast.
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