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You are examining a TAF issued for London Heathrow:

EGLL 051056Z 0512/0618 28010KT 9999 SCT025 TEMPO 0515/0612 6000 -SHRA HZ BKN014 BECMG 0523/0602 34008KT PROB40 TEMPO 0523/0611 4000 -DZ BR BKN008

Based on this forecast, when was it issued, and what time span does it cover?

  • A

    It was issued at 1056 local time. It is valid until 0618.

  • B

    It was issued at 1056 local time. It is valid until 0611.

  • C

    It was issued at 1056 UTC. It is valid for 6 hours.

  • D

    It was issued at 1056 UTC. It is valid for 30 hours.

EGLL 051056Z 0512/0618 28010KT 9999 SCT025 TEMPO 0515/0612 6000 -SHRA HZ BKN014 BECMG 0523/0602 34008KT PROB40 TEMPO 0523/0611 4000 -DZ BR BKN008

  • EGLL = ICAO code for London Heathrow Airport
  • 051056Z = Issued on the 5th of the month at 10:56 UTC
  • 0512/0618 = Valid from the 5th at 12:00 UTC to the 6th at 18:00 UTC (30-hour TAF – standard for major airports)

Main forecast for 05/12:00–06/18:00:

  • Wind: 280° at 10 knots (28010KT)
  • Visibility: 10 km or more (9999)
  • Clouds: Scattered clouds at 2500 feet above ground level (SCT025)

TEMPO 0515/0612 (Temporary conditions between 15:00 on the 5th and 12:00 on the 6th):

  • Visibility = 6000 meters (6000)
  • Weather = Light showers of rain (-SHRA) and haze (HZ)
  • Clouds = Broken cloud at 1400 feet (BKN014)

BECMG 0523/0602 (Becoming between 23:00 on the 5th and 02:00 on the 6th):

Wind changes to = 340° at 8 knots (34008KT)

PROB40 TEMPO 0523/0611 (Probability: 40% chance of the following temporary conditions between 23:00 on the 5th and 11:00 on the 6th):

  • Visibility = 4000 meters (4000)
  • Weather = Light drizzle (-DZ) and mist (BR)
  • Clouds = Broken cloud at 800 feet (BKN008)

Your Notes (not visible to others)



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