Aviation Digital Data Service (ADDS)

Output produced by TAFs form (0710 UTC 30 April 2016)
found at http://www.aviationweather.gov/adds/tafs/
 
Forecast for: EGLL (LONDON/HEATHROW , GB)
Text: TAF EGLL 300500Z 3006/0112 31008KT 9999 SCT035
Forecast period: 0600 UTC 30 April 2016 to 1200 UTC 01 May 2016
Forecast type: FROM: standard forecast or significant change
Winds: from the NW (310 degrees) at 9 MPH (8 knots; 4.2 m/s)
Visibility: 6 or more miles (10+ km)
Clouds: scattered clouds at 3500 feet AGL
Weather: no significant weather forecast for this period
Text: PROB40
Forecast period: 1100 to 1900 UTC 30 April 2016
Forecast type: TEMPORARY: The following changes expected for less than half the time period
Visibility: 4 miles (6 km)
Weather: SHRA  (rain showers)