NOTAMs can activate Temporary Flight Restrictions. NOTAMs detail control tower operating times. NOTAMs give weather forecasts.
Understanding Airspace
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The airspace reverts to Class E or a combination of Class E and G airspace during the hours the tower is not in operation. The airspace designation normally will not change.
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1200 feet AGL. 4000 feet AGL. 1200 feet MSL.
when the weather minimums are below basic VFR. when the associated control tower is in operation. when the associated Flight Service Station is in operation.