Aviation Digital Data Service (ADDS)

Output produced by TAFs form (1931 UTC 16 August 2017)
found at http://www.aviationweather.gov/adds/tafs/
 
Forecast for: EGLL (LONDON/HEATHROW , GB)
Text: TAF EGLL 161657Z 1618/1724 20010KT 9999 FEW040
Forecast period: 1800 UTC 16 August 2017 to 0000 UTC 17 August 2017
Forecast type: FROM: standard forecast or significant change
Winds: from the SSW (200 degrees) at 12 MPH (10 knots; 5.2 m/s)
Visibility: 6 or more miles (10+ km)
Clouds: few clouds at 4000 feet AGL
Weather: no significant weather forecast for this period
Text: BECMG 1700/1703 7000 -RA SCT005 BKN010
Forecast period: 0000 to 0600 UTC 17 August 2017
Forecast type: BECOMING: Conditions expected to become as follows by 0300 UTC 17 August 2017
Winds: from the SSW (200 degrees) at 12 MPH (10 knots; 5.2 m/s)
Visibility: 4 miles (7 km)
Ceiling: 1000 feet AGL
Clouds: scattered clouds at 500 feet AGL
broken clouds at 1000 feet AGL
Weather: -RA  (light rain)
Text: TEMPO 1701/1706 3000 +RA RADZ BKN004
Forecast period: 0100 to 0600 UTC 17 August 2017
Forecast type: TEMPORARY: The following changes expected for less than half the time period
Visibility: 1.86 miles (2.99 km)
Ceiling: 400 feet AGL
Clouds: broken clouds at 400 feet AGL
Weather: +RA RA DZ  (heavy rain, rain, drizzle)
Text: BECMG 1706/1709 9999 NSW SCT020
Forecast period: 0600 UTC 17 August 2017 to 0000 UTC 18 August 2017
Forecast type: BECOMING: Conditions expected to become as follows by 0900 UTC 17 August 2017
Winds: from the SSW (200 degrees) at 12 MPH (10 knots; 5.2 m/s)
Visibility: 6 or more miles (10+ km)
Clouds: scattered clouds at 2000 feet AGL
Weather: NSW  (no significant weather)
Text: PROB30
Forecast period: 0900 to 1300 UTC 17 August 2017
Forecast type: TEMPORARY: The following changes expected for less than half the time period
Visibility: 5 miles (8 km)
Ceiling: 1400 feet AGL
Clouds: broken clouds at 1400 feet AGL
Weather: -SHRA  (light rain showers)
Text: TEMPO 1709/1713 8000 -SHRA BKN014
Forecast period: 1300 to 1900 UTC 17 August 2017
Forecast type: TEMPORARY: The following changes expected for less than half the time period
Visibility: 4 miles (6 km)
Weather: SHRA  (rain showers)