Large and small migratory birds on and in vicinity of airport.
Ultralight actvty on and in vicinity of airport.
Ultralights must maintain radio contact at all times.
DUSK-DAWN. When air traffic control tower closed MIRL runways 04/22 and 18/36 and HIRL runway 13/31 preset on low intensity; to incr intensity and activate MALSR runway 13; vasi runways 18 and 31 and REIL runways 18 and 31 - CTAF.