Fresh
Every required NASA FIRMS source validated in the same run within the current freshness threshold.
Partial
At least one required source is newly validated while a failed or suspect source retains its previous verified data and is marked stale.
Delayed or critical stale
After one hour without a complete required-source check the globe warns that data may be delayed. After six hours it presents a stronger stale warning. A failed run never overwrites the last valid release with empty or corrupt data.