<Tr> <Td> Signal #3 winds of 121--170 km / h, (74--105 mph) are expected to occur within 18 hours . </Td> </Tr> <Tr> <Td> Signal #4 winds of 171--220 km / h, (106--137 mph) are expected to occur within 12 hours . </Td> </Tr> <Tr> <Td> Signal #5 winds of at least 220 km / h, (137 mph) are expected to occur within 12 hours . </Td> </Tr> <P> The Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) releases tropical cyclone warnings in the form of Tropical Cyclone Warning Signals . An area having a storm signal may be under: </P>

What is meant when a tropical cyclone has entered the par