ILOILO CITY — Several river systems in Western Visayas remain under close monitoring for possible flooding and landslides as Typhoon Francisco (international name: Mekkhala) continues to enhance the southwest monsoon or habagat, according to the Philippine Atmospheric, Geophysical and Astronomical Services Administration (Pagasa). In General Flood Advisory No. 7 for Region 6, issued at 6 p.m.