TAF Trakerbeta
What's coming
The TAF in effect and the latest GFS MOS run for the hours ahead. MOS keeps going after the TAF ends.
How the forecast evolved
Every MOS run and TAF version that covered this window, oldest at top, against what actually happened. Each TAF is bright while it was the one in effect.
How the forecast for one hour converged
Each MOS run and TAF version's forecast for the selected hour, by how far ahead it was issued, against what happened. Click anywhere on the chart above to pick an hour.
Ceiling
Lowest broken or overcast layer: what was observed (white) against what the TAF in effect said (cyan).
Visibility
Statute miles, observed (white) against the TAF in effect (cyan). Scaled to stretch the low end.
Cloud layers
Every reported layer by height: filled is observed (ASOS sees up to 12,000 ft), outlined is the TAF in effect.
Wind
Sustained wind and gusts in knots, with barbs for direction. Only big misses count: 10+ kt above anything the TAF allowed.
Scorecard for this window
Each observation graded against the TAF in effect at the time.
Accuracy by lead time
Every version, by how far ahead it was issued. MOS covers the run-up before TAFs reach that far.
Forecast revisions
Where each new TAF changed the flight category it forecast for hours the previous version already covered. Big downgrades are the "be careful here" signal.
TAF history
Newest first. Per-version scores cover only observations after it was issued.
Observations
5-minute ASOS and METAR/SPECI, newest first.