Aviation Digital Data Service (ADDS)

Output produced by TAFs form (0425 UTC 25 August 2016)
found at http://www.aviationweather.gov/adds/tafs/
 
Forecast for: EGLL (LONDON/HEATHROW , GB)
Text: TAF EGLL 242256Z 2500/2606 05005KT CAVOK
Forecast period: 0000 to 2000 UTC 25 August 2016
Forecast type: FROM: standard forecast or significant change
Winds: from the NE (50 degrees) at 6 MPH (5 knots; 2.6 m/s)
Visibility: 6 or more miles (10+ km)
Clouds: not forecast
Weather: NSW  (no significant weather)
Text: PROB40
Forecast period: 0000 UTC 25 August 2016 to 0000 UTC 26 August 2016
Forecast type: TEMPORARY: The following changes expected for less than half the time period
Visibility: 4 miles (7 km)
Weather: SHRA  (rain showers)
Text: TEMPO 2500/2524 7000 SHRA
Forecast period: 2000 UTC 25 August 2016 to 0600 UTC 26 August 2016
Forecast type: BECOMING: Conditions expected to become as follows by 2300 UTC 25 August 2016
Winds: from the WNW (300 degrees) at 12 MPH (10 knots; 5.2 m/s)
Visibility: 6 or more miles (10+ km)
Weather: NSW  (no significant weather)
Text: BECMG 2520/2523 30010KT
Forecast period: 0000 to 0600 UTC 26 August 2016
Forecast type: TEMPORARY: The following changes expected for less than half the time period
Visibility: 4 miles (7 km)
Ceiling: 800 feet AGL
Clouds: broken clouds at 800 feet AGL
Weather: no significant weather forecast for this period