What the map shows
How overcast it will be at the forecast time, from clear to completely covered.
How to read the colors
Areas under 10% stay unshaded. Grays deepen from about 10% to 50%, then blues take over from about 50% up to 100%, brightening to pale blue where the sky is fully covered.
Common mistakes
- Reading a high total as rain — a fully overcast sky can stay dry.
- Confusing it with the by-levels version, which shows where each cloud deck sits.