View Single Post
Old 27th Feb 2010, 07:12   #13 (permalink)
Checkboard
 
Join Date: Aug 1998
Location: Ex-pat Aussie in the UK
Posts: 3,601
Quote:
The met report/forecast in the op is the equivalent of an Australian TTF METAR.
Not quite. In Europe, when a statement of trend is attached to a METAR, that trend forecast is valid for two hours, not the three of a TTF. The TREND is a forecast, and as such is valid for determining weather for the "one hour before and one hour after" requirement for the selection of alternates and the like.

Quote:
UK AIP GEN 3.5 - 32

10.13 TREND


10.13.1 For selected aerodromes, this is a forecast of significant changes in conditions during the two hours after the observation time: a. Change Indicator: BECMG (becoming) or TEMPO (temporary), which may be followed by a time group (hours and minutes UTC) preceded by one of the letter indicators FM (from), TL (until), AT (at); b. Weather: Standard codes are used. NOSIG replaces the trend group when no significant changes are forecast to occur during the trend forecast period. Examples: BECMG FM1100 25035G50KT; TEMPO FM0630 TL0830 3000 SHRA.
Checkboard is online now   Reply With Quote