The Clouds overlay on the Map and Profile views is based on the GFS Cloud Coverage product. Differences in timestamps occur due to the following reasons:
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Map View Timestamp: Reflects the model time, which represents the start of the forecast's validity period.
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Profile View Timestamp: Indicates the time ForeFlight received and processed the data.
The GFS Cloud Coverage product typically has a delay of about five hours between the model's validity time and the publication of the data. Once published, the data is processed and displayed in ForeFlight Mobile.
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