Aviation Digital Data Service (ADDS)

Output produced by TAFs form (1440 UTC 24 July 2014)
found at http://www.aviationweather.gov/adds/tafs/
 
Forecast for: EGLL (LONDON/HEATHROW , GB)
Text: TAF EGLL 241054Z 2412/2518 05008KT CAVOK
Forecast period: 1200 UTC 24 July 2014 to 1800 UTC 25 July 2014
Forecast type: FROM: standard forecast or significant change
Winds: from the NE (50 degrees) at 9 MPH (8 knots; 4.2 m/s)
Visibility: 6 or more miles (10+ km)
Clouds: not forecast
Weather: NSW  (no significant weather)
Text: PROB30
Forecast period: 1200 to 1400 UTC 24 July 2014
Forecast type: TEMPORARY: The following changes expected for less than half the time period
Ceiling: 4800 feet AGL
Clouds: broken clouds at 4800 feet AGL
Weather: no significant weather forecast for this period
Text: TEMPO 2412/2414 BKN048
Forecast period: 0400 to 0800 UTC 25 July 2014
Forecast type: PROBABLE: 30 percent likelihood of the following during this time
Visibility: 5 miles (8 km)
Ceiling: 1000 feet AGL
Clouds: scattered clouds at 700 feet AGL
broken clouds at 1000 feet AGL
Weather: no significant weather forecast for this period
Text: PROB30 2504/2508 8000 SCT007 BKN010
Forecast period: 1200 to 1800 UTC 25 July 2014
Forecast type: TEMPORARY: The following changes expected for less than half the time period
Visibility: 4 miles (6 km)
Ceiling: 4500 feet AGL
Clouds: broken clouds at 4500 feet AGL
Weather: SHRA  (rain showers)