Aviation Digital Data Service (ADDS)

Output produced by TAFs form (2231 UTC 28 July 2014)
found at http://www.aviationweather.gov/adds/tafs/
 
Forecast for: EGLL (LONDON/HEATHROW , GB)
Text: TAF EGLL 281702Z 2818/2924 36007KT 9999 FEW020 SCT040
Forecast period: 1800 UTC 28 July 2014 to 0000 UTC 30 July 2014
Forecast type: FROM: standard forecast or significant change
Winds: from the N (360 degrees) at 8 MPH (7 knots; 3.6 m/s)
Visibility: 6 or more miles (10+ km)
Clouds: few clouds at 2000 feet AGL
scattered clouds at 4000 feet AGL
Weather: no significant weather forecast for this period
Text: PROB30
Forecast period: 1800 UTC 28 July 2014 to 0700 UTC 29 July 2014
Forecast type: TEMPORARY: The following changes expected for less than half the time period
Visibility: 4 miles (7 km)
Ceiling: 1400 feet AGL
Clouds: broken clouds at 1400 feet AGL
Weather: -RA  (light rain)