TEMPO Group

METEOROLOGY FLIGHT PLANNING

CHAPTER ONE

expected to exist until the end of the TAF forecast time period (unless changed later in the

forecast by another change group).

KNSE TAF 260909 28004KT 9000 HZ SCT020 SCT200 QNH2998INS

FM1200 26007KT 9000 HZ SCT025 SCT080 BKN250 QNH2996INS

VCSHRA

BECMG 1416 9999 SCT025CB SCT250

BECMG 1718 23015G25KT 530004

TEMPO 1902 8000 TSSHRA SCT010 BKN025CB

FM0200 27010KT 9999 SCT030 BKN080 BKN250 QNH3001INS 20/09Z

Figure 1-29 TAF BECMG Group

From Figure 1-29, some aspects of the weather will begin to change slowly sometime between

1700 and 1800Z, specifically the winds and turbulence. These forecast winds of 230 at 15 kts,

gusting to 25 kts, and the frequent, moderate CAT can be expected to last until superseded by the

FM group at 0200Z.

TEMPO Group

The heading "TEMPO" followed by a 4-digit time group indicates the weather conditions on this

line will occur briefly, and will not represent a permanent change in the overall forecast weather

pattern. Rather, there will be a short-lived overlay to the base forecast occurring only between

the beginning and ending hours (two digits for each) specified by the time group. Furthermore,

only the elements listed are forecasted to be affected.

For example, in Figure 1-30, the temporary occurrence of thunderstorms and rain showers are

forecast to exist only from 1900 up to, but not including, 0200. After this time, the conditions

listed in the TEMPO line will be replaced by the forecast from other lines.

KNSE TAF 260909 28004KT 9000 HZ SCT020 SCT200 QNH2998INS

FM1200 26007KT 9000 HZ SCT025 SCT080 BKN250 QNH2996INS

VCSHRA

BECMG 1416 9999 SCT025CB SCT250

BECMG 1718 23015G25KT 530004

TEMPO 1902 8000 TSSHRA SCT010 BKN025CB

FM0200 27010KT 9999 SCT030 BKN080 BKN250 QNH3001INS 20/09Z

Figure 1-30 TAF TEMPO Group

AVIATION ROUTINE WEATHER REPORTS AND TERMINAL AERODROME

FORECASTS 1-25