Aviation Digital Data Service (ADDS)

Output produced by TAFs form (0022 UTC 21 August 2014)
found at http://www.aviationweather.gov/adds/tafs/
 
Forecast for: EGLL (LONDON/HEATHROW , GB)
Text: TAF EGLL 202301Z 2100/2206 24008KT 9999 SCT045
Forecast period: 0000 UTC 21 August 2014 to 0600 UTC 22 August 2014
Forecast type: FROM: standard forecast or significant change
Winds: from the WSW (240 degrees) at 9 MPH (8 knots; 4.2 m/s)
Visibility: 6 or more miles (10+ km)
Clouds: scattered clouds at 4500 feet AGL
Weather: no significant weather forecast for this period
Text: TEMPO 2122/2206 7000 -RADZ BKN012
Forecast period: 2200 UTC 21 August 2014 to 0600 UTC 22 August 2014
Forecast type: TEMPORARY: The following changes expected for less than half the time period
Visibility: 4 miles (7 km)
Ceiling: 1200 feet AGL
Clouds: broken clouds at 1200 feet AGL
Weather: -RA -DZ  (light rain, light drizzle)
Text: PROB30
Forecast period: 0100 to 0500 UTC 22 August 2014
Forecast type: TEMPORARY: The following changes expected for less than half the time period
Visibility: 2.49 miles (4.01 km)
Ceiling: 800 feet AGL
Clouds: scattered clouds at 500 feet AGL
broken clouds at 800 feet AGL
Weather: RA DZ  (rain, drizzle)