Question 1

When is the sea of clouds most likely to appear?

Accepted Answer

It is more common in the cooler season, especially at dawn after light rain when humidity is high and wind is weak. This is general knowledge; check the daily probability for each spot in the app.

Question 2

How does Mây Đèo calculate probability?

Accepted Answer

The app takes weather forecasts (cloud layers, humidity by altitude, wind, temperature), scores each spot against its own thresholds and shows the probability with a confidence level. It is an estimate, not a promise.

Question 3

Does the app work without a signal?

Accepted Answer

Without a signal the app shows the last saved forecast with its update time, and reports you send are kept on your phone and resent when you are back online. The map does not work offline yet.

Question 4

How do I report a road condition?

Accepted Answer

Stop somewhere safe, open the Road reports tab, choose the pass, the type of hazard and its severity, then send. A description and a photo are optional.