Aviation Digital Data Service (ADDS)

Output produced by TAFs form (2109 UTC 23 July 2016)
found at http://www.aviationweather.gov/adds/tafs/
 
Forecast for: EGLL (LONDON/HEATHROW , GB)
Text: TAF EGLL 231650Z 2318/2424 22006KT 9999 FEW040
Forecast period: 1800 UTC 23 July 2016 to 0000 UTC 25 July 2016
Forecast type: FROM: standard forecast or significant change
Winds: from the SW (220 degrees) at 7 MPH (6 knots; 3.1 m/s)
Visibility: 6 or more miles (10+ km)
Clouds: few clouds at 4000 feet AGL
Weather: no significant weather forecast for this period
Text: PROB30
Forecast period: 2200 UTC 24 July 2016 to 0000 UTC 25 July 2016
Forecast type: TEMPORARY: The following changes expected for less than half the time period
Ceiling: 1200 feet AGL
Clouds: broken clouds at 1200 feet AGL
Weather: no significant weather forecast for this period