Aviation Digital Data Service (ADDS)

Output produced by TAFs form (0024 UTC 17 December 2017)
found at http://www.aviationweather.gov/adds/tafs/
 
Forecast for: EGLL (LONDON/HEATHROW , GB)
Text: TAF EGLL 162305Z 1700/1806 30005KT 6000 SCT030
Forecast period: 0000 to 1400 UTC 17 December 2017
Forecast type: FROM: standard forecast or significant change
Winds: from the WNW (300 degrees) at 6 MPH (5 knots; 2.6 m/s)
Visibility: 4 miles (6 km)
Clouds: scattered clouds at 3000 feet AGL
Weather: no significant weather forecast for this period
Text: TEMPO 1700/1712 3000 BR MIFG BKN003
Forecast period: 0000 to 1200 UTC 17 December 2017
Forecast type: TEMPORARY: The following changes expected for less than half the time period
Visibility: 1.86 miles (2.99 km)
Ceiling: 300 feet AGL
Clouds: broken clouds at 300 feet AGL
Weather: BR MIFG  (mist, shallow fog)
Text: PROB40 1701/1710 0300 FZFG FG VV///
Forecast period: 0100 to 1000 UTC 17 December 2017
Forecast type: PROBABLE: 40 percent likelihood of the following during this time
Visibility: 0.19 miles (0.31 km)
Weather: FZFG FG  (freezing fog, fog)
Text: TEMPO 1712/1714 RA BKN007
Forecast period: 1200 to 1400 UTC 17 December 2017
Forecast type: TEMPORARY: The following changes expected for less than half the time period
Ceiling: 700 feet AGL
Clouds: broken clouds at 700 feet AGL
Weather: RA  (rain)
Text: BECMG 1714/1717 24010KT -RADZ BKN006
Forecast period: 1400 to 2200 UTC 17 December 2017
Forecast type: BECOMING: Conditions expected to become as follows by 1700 UTC 17 December 2017
Winds: from the WSW (240 degrees) at 12 MPH (10 knots; 5.2 m/s)
Visibility: 4 miles (6 km)
Ceiling: 600 feet AGL
Clouds: broken clouds at 600 feet AGL
Weather: -RA -DZ  (light rain, light drizzle)
Text: PROB40
Forecast period: 1700 to 2200 UTC 17 December 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 DZ  (rain, drizzle)
Text: TEMPO 1717/1722 3000 RADZ BKN004
Forecast period: 2200 UTC 17 December 2017 to 0600 UTC 18 December 2017
Forecast type: BECOMING: Conditions expected to become as follows by 0000 UTC 18 December 2017
Winds: from the NW (320 degrees) at 9 MPH (8 knots; 4.2 m/s)
Visibility: 6 or more miles (10+ km)
Clouds: few clouds at 3000 feet AGL
Weather: NSW  (no significant weather)