Aviation Digital Data Service (ADDS)

Output produced by TAFs form (0714 UTC 19 December 2014)
found at http://www.aviationweather.gov/adds/tafs/
 
Forecast for: EGLL (LONDON/HEATHROW , GB)
Text: TAF EGLL 190458Z 1906/2012 23015KT 9999 BKN016
Forecast period: 0600 to 0700 UTC 19 December 2014
Forecast type: FROM: standard forecast or significant change
Winds: from the SW (230 degrees) at 17 MPH (15 knots; 7.8 m/s)
Visibility: 6 or more miles (10+ km)
Ceiling: 1600 feet AGL
Clouds: broken clouds at 1600 feet AGL
Weather: no significant weather forecast for this period
Text: TEMPO 1906/1908 24018G28KT 5000 RADZ BKN009
Forecast period: 0600 to 0800 UTC 19 December 2014
Forecast type: TEMPORARY: The following changes expected for less than half the time period
Winds: from the WSW (240 degrees) at 21 MPH (18 knots; 9.4 m/s)
gusting to 32 MPH (28 knots; 14.6 m/s)
Visibility: 3 miles (5 km)
Ceiling: 900 feet AGL
Clouds: broken clouds at 900 feet AGL
Weather: RA DZ  (rain, drizzle)
Text: BECMG 1907/1909 29012KT CAVOK
Forecast period: 0700 UTC 19 December 2014 to 1200 UTC 20 December 2014
Forecast type: BECOMING: Conditions expected to become as follows by 0900 UTC 19 December 2014
Winds: from the WNW (290 degrees) at 14 MPH (12 knots; 6.2 m/s)
Visibility: 6 or more miles (10+ km)
Weather: NSW  (no significant weather)