Tropical cyclones that become tropical storms between the coast of Americas and 140 Â W are named by the National Hurricane Center ( NHC ) , whilst tropical cyclones intensifying into tropical storms between 140 Â W and 180 Â are named by the Central Pacific Hurricane Center ( CPHC ) . Tropical cyclones that intensify into tropical storms between the coast of Americas and 140 Â W are named by the National Hurricane Center ( NHC\/RSMC Miami ) , whilst tropical cyclones intensifying into tropical storms between 140 Â W and 180 Â are named by the Central Pacific Hurricane Center ( CPHC\/RSMC Honolulu ) .