TAF (Terminal Aerodrome Forecast)
Paste a raw TAF message to decode issue time, validity window, wind, visibility, weather, clouds, and FM/BECMG/TEMPO/PROB change groups.
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TAF (Terminal Aerodrome Forecast)
The TAF Decoder helps you transform a raw TAF message into a readable forecast summary. Paste the forecast string and get the issue time, validity window, base forecast, and change groups such as FM, BECMG, TEMPO, and PROB.
If you need a TAF decoder online for fast briefing, this page gives a clear aviation weather forecast summary and a short guide on how to read TAF.
This tool is useful before a flight briefing, simulator session, or route review when you need a quick interpretation of wind, visibility, weather, and cloud layers.
What You Get From The Decoder
- Station ICAO identifier and issue time.
- Forecast validity period (from/to UTC blocks).
- Decoded wind and visibility information.
- Weather and cloud interpretation in plain text.
- Aggregated change groups for timeline-style reading.
- Quick forecast flight-rules category (VFR, MVFR, IFR, LIFR).
Example TAF
TAF KBOS 270920Z VRB05KT 9999 SCT025 BKN045
- Wind:
VRB05KTmeans variable wind at 5 kt. - Visibility:
9999means around 10 km or more. - Clouds:
SCT025 BKN045means SCT at 2500 ft and BKN at 4500 ft.
What It Means For Flying
The baseline conditions are generally good for VFR. Still, always review FM, BECMG, TEMPO, and PROB groups because temporary changes can lower margins.
How To Read TAF
- Start with issue time and validity period.
- Check wind direction and speed in kt.
- Check visibility in km, especially lower values.
- Read cloud layers (SCT/BKN/OVC) and base in ft.
- Treat TEMPO as temporary fluctuations.
- Treat BECMG as a gradual transition.
- Treat FM as a defined change from a specific time.
Related Tools
- METAR Decoder for current observed weather.
- Crosswind Calculator for runway wind component checks.
- Headwind/Tailwind Calculator for performance awareness.
- Density Altitude Calculator for aircraft performance context.
Important Note
This decoder is designed for education, quick interpretation, and workflow support. Always verify operational decisions with official aviation weather products and your approved briefing sources.
live_help Frequently Asked Questions (FAQ)
What is the difference between METAR and TAF?
A METAR describes current observed weather, while a TAF is a forecast for a future time window. Use METAR for “now” and TAF for planning upcoming conditions.
Can I paste multiline TAF text?
Yes. The decoder accepts both multiline and single-line input. It normalizes spacing and parses change groups in sequence.
Why does flight-rules category change even when wind looks good?
Flight rules are driven mostly by visibility and ceiling, not just wind. You can have acceptable wind but still get IFR/LIFR due to low cloud base or fog.
Is this tool valid for operational dispatch decisions?
Use it as a support tool for readability and quick checks. For operational decisions, always rely on official aviation weather sources and your approved briefing workflow.
What does TEMPO mean in TAF?
TEMPO means temporary fluctuations during a defined time window. Conditions may worsen or improve for short periods, then return to baseline.
What does BECMG mean in TAF?
BECMG means a gradual transition from one weather state to another. The change happens within the stated period, not instantly.
What does FM mean in TAF?
FM indicates a defined change starting from a specific time. From that moment, a new set of forecast conditions applies.
What is PROB30 in TAF?
PROB30 means a 30% probability that the attached weather condition will occur. It is not guaranteed, but it should be treated as relevant risk.
How accurate is TAF?
TAF accuracy depends on local weather dynamics and forecast horizon. It is usually more reliable closer to the valid time and should be rechecked before departure.
Can TAF be used for flight planning?
Yes, TAF is a core planning input for destination and alternate assessment. It should be used together with METAR, NOTAM, and official briefing material.
Why can TAF change before my flight?
Forecasts are updated when new data indicates meaningful weather changes. Always check the latest issue time before making final decisions.
Should I review TAF for both destination and alternate airports?
Yes. Weather at destination and alternate can evolve differently, even over short distances. Reviewing both helps reduce operational risk.