Why the roof can drip after the rain stops
The rain has ended, but the drip has not. Water can remain inside a roof assembly and keep moving after the outside surface begins to dry. Lee's Summit Select Roofing can help you start with the right roofing question.

Water takes a route through the roof
Shingles shed rain over their overlapping courses. When water gets beneath them at a damaged piece or flashing joint, it can run along the underlayment, deck or framing instead of falling straight down. It then appears where there is an opening or a lower point inside.
That route can take time. Absorbent material can also hold moisture and release it later. A delayed drip is therefore possible without a new shower, but it does not identify the entry point or prove the roof is the only potential source.
If you have an active leak, Leak Next Step helps put safety ahead of investigation. You can also request a free inspection without knowing the cause.
The ceiling mark is a clue, not a target
A stain near a chimney can involve flashing, but it could also be water arriving from a different point. Cutting into the ceiling or coating the roof directly over the mark is not a reliable way to establish the route.
A roofer looks for a physical explanation that connects the outside detail to the reported symptom. The surrounding roofing matters too, because repairing an opening requires a sound place for the new work to connect.

A dry afternoon does not prove the leak is fixed
A roof can dry between storms while the failed detail remains. The next wind-driven rain may use the same route. An old stain should not be assumed active, either; the roof assessment needs to distinguish a past problem from a present one.
Once water entry is corrected, damaged interior materials may need their own repair and drying. Roof work and interior restoration are different scopes, even when one caused the need for the other.
The roof repair page explains local repairs, larger damaged areas and the condition that makes replacement worth discussing.
Get the entry point checked
Tell Lee's Summit Select Roofing where the water appeared and roughly when it started. A free roof inspection is a useful next step toward tracing the opening.