Aviation Digital Data Service (ADDS)

Output produced by TAFs form (1656 UTC 23 April 2014)
found at http://www.aviationweather.gov/adds/tafs/
 
Forecast for: EGLL (LONDON/HEATHROW , GB)
Text: TAF EGLL 231100Z 2312/2418 18010KT 9999 SCT030
Forecast period: 1200 UTC 23 April 2014 to 0000 UTC 24 April 2014
Forecast type: FROM: standard forecast or significant change
Winds: from the S (180 degrees) at 12 MPH (10 knots; 5.2 m/s)
Visibility: 6 or more miles (10+ km)
Clouds: scattered clouds at 3000 feet AGL
Weather: no significant weather forecast for this period
Text: TEMPO 2317/2402 7000 -RA BKN012
Forecast period: 1700 UTC 23 April 2014 to 0200 UTC 24 April 2014
Forecast type: TEMPORARY: The following changes expected for less than half the time period
Visibility: 4 miles (7 km)
Ceiling: 1200 feet AGL
Clouds: broken clouds at 1200 feet AGL
Weather: -RA  (light rain)
Text: PROB40
Forecast period: 2100 UTC 23 April 2014 to 0200 UTC 24 April 2014
Forecast type: TEMPORARY: The following changes expected for less than half the time period
Visibility: 2.49 miles (4.01 km)
Ceiling: 800 feet AGL
Clouds: broken clouds at 800 feet AGL
Weather: RA  (rain)
Text: TEMPO 2321/2402 4000 RA BKN008
Forecast period: 0000 to 1800 UTC 24 April 2014
Forecast type: BECOMING: Conditions expected to become as follows by 0300 UTC 24 April 2014
Winds: variable direction winds at 3 MPH (3 knots; 1.6 m/s)
Visibility: 6 or more miles (10+ km)
Clouds: scattered clouds at 3000 feet AGL
Weather: no significant weather forecast for this period
Text: BECMG 2400/2403 VRB03KT
Forecast period: 0200 to 0900 UTC 24 April 2014
Forecast type: PROBABLE: 40 percent likelihood of the following during this time
Visibility: 1.86 miles (2.99 km)
Ceiling: 400 feet AGL
Clouds: broken clouds at 400 feet AGL
Weather: BR  (mist)
Text: PROB40 2402/2409 3000 BR BKN004
Forecast period: 1200 to 1800 UTC 24 April 2014
Forecast type: TEMPORARY: The following changes expected for less than half the time period
Visibility: 4 miles (7 km)
Weather: SHRA  (rain showers)