Aviation Digital Data Service (ADDS)

Output produced by METARs form (0014 UTC 23 March 2019)
found at http://www.aviationweather.gov/metar/data/
 
Forecast for: EGLL (LONDON/HEATHROW , GB)
Text: TAF EGLL 222302Z 2300/2406 25008KT 9999 SCT025
Forecast period: 0000 to 0500 UTC 23 March 2019
Forecast type: FROM: standard forecast or significant change
Winds: from the WSW (250 degrees) at 9 MPH (8 knots; 4.1 m/s)
Visibility: 6 or more miles 10+ km)
Ceiling: at least 12,000 feet AGL
Clouds: scattered clouds at 2500 feet AGL
Weather: no significant weather forecast for this period
Text: PROB40
Forecast period: 0000 to 0200 UTC 23 March 2019
Forecast type: TEMPORARY: The following changes expected for less than half the time period
Visibility: 5 miles (8 km)
Ceiling: unknown
Clouds: missing
Weather: no significant weather forecast for this period
Text: TEMPO 2300/2302 8000
Forecast period: 0200 to 1100 UTC 23 March 2019
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 -DZ  (light rain, light drizzle)
Text: TEMPO 2302/2311 7000 -RADZ BKN012
Forecast period: 0500 to 1900 UTC 23 March 2019
Forecast type: BECOMING: Conditions expected to become as follows by 0800 UTC 23 March 2019
Winds: from the NNE (20 degrees) at 12 MPH (10 knots; 5.1 m/s)
Visibility: 6 or more miles 10+ km)
Ceiling: at least 12,000 feet AGL
Clouds: scattered clouds at 2500 feet AGL
Weather: no significant weather forecast for this period
Text: BECMG 2305/2308 02010KT
Forecast period: 1900 UTC 23 March 2019 to 0600 UTC 24 March 2019
Forecast type: BECOMING: Conditions expected to become as follows by 2200 UTC 23 March 2019
Winds: from the E (80 degrees) at 6 MPH (5 knots; 2.6 m/s)
Visibility: 6 or more miles 10+ km)
Ceiling: at least 12,000 feet AGL
Clouds: scattered clouds at 2500 feet AGL
Weather: no significant weather forecast for this period