Aviation Digital Data Service (ADDS)

Output produced by TAFs form (1739 UTC 28 July 2015)
found at http://www.aviationweather.gov/adds/tafs/
 
Forecast for: EGLL (LONDON/HEATHROW , GB)
Text: TAF EGLL 281655Z 2818/2924 25013KT 9999 SCT040
Forecast period: 1800 UTC 28 July 2015 to 0700 UTC 29 July 2015
Forecast type: FROM: standard forecast or significant change
Winds: from the WSW (250 degrees) at 15 MPH (13 knots; 6.8 m/s)
Visibility: 6 or more miles (10+ km)
Clouds: scattered clouds at 4000 feet AGL
Weather: no significant weather forecast for this period
Text: BECMG 2907/2910 31011KT
Forecast period: 0700 UTC 29 July 2015 to 0000 UTC 30 July 2015
Forecast type: BECOMING: Conditions expected to become as follows by 1000 UTC 29 July 2015
Winds: from the NW (310 degrees) at 13 MPH (11 knots; 5.7 m/s)
Visibility: 6 or more miles (10+ km)
Clouds: scattered clouds at 4000 feet AGL
Weather: no significant weather forecast for this period
Text: PROB30
Forecast period: 1200 to 2000 UTC 29 July 2015
Forecast type: TEMPORARY: The following changes expected for less than half the time period
Visibility: 4 miles (7 km)
Weather: SHRA  (rain showers)