Aviation Digital Data Service (ADDS)

Output produced by TAFs form (2342 UTC 16 October 2017)
found at http://www.aviationweather.gov/adds/tafs/
 
Forecast for: EGLL (LONDON/HEATHROW , GB)
Text: TAF EGLL 162254Z 1700/1806 23014KT 9999 SCT025
Forecast period: 0000 to 1800 UTC 17 October 2017
Forecast type: FROM: standard forecast or significant change
Winds: from the SW (230 degrees) at 16 MPH (14 knots; 7.3 m/s)
Visibility: 6 or more miles (10+ km)
Clouds: scattered clouds at 2500 feet AGL
Weather: no significant weather forecast for this period
Text: PROB30
Forecast period: 1500 to 2100 UTC 17 October 2017
Forecast type: TEMPORARY: The following changes expected for less than half the time period
Visibility: 4 miles (7 km)
Weather: -SHRA  (light rain showers)
Text: TEMPO 1715/1721 7000 -SHRA
Forecast period: 1800 UTC 17 October 2017 to 0600 UTC 18 October 2017
Forecast type: BECOMING: Conditions expected to become as follows by 2100 UTC 17 October 2017
Winds: from the NE (40 degrees) at 7 MPH (6 knots; 3.1 m/s)
Visibility: 6 or more miles (10+ km)
Clouds: scattered clouds at 2500 feet AGL
Weather: no significant weather forecast for this period
Text: BECMG 1718/1721 04006KT
Forecast period: 0300 to 0600 UTC 18 October 2017
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: -DZ  (light drizzle)
Text: TEMPO 1803/1806 7000 -DZ BKN012
Forecast period: 0400 to 0600 UTC 18 October 2017
Forecast type: TEMPORARY: The following changes expected for less than half the time period
Visibility: 2.49 miles (4.01 km)
Ceiling: 900 feet AGL
Clouds: broken clouds at 900 feet AGL
Weather: BR  (mist)