Islamabad-The Pakistan Meteorological Department (PMD) on Friday warned that monsoon activity is expected to intensify across large parts of the country from July 18 (tomorrow), with widespread rain, windstorms and thunderstorms forecast through July 25, raising the risk of flash floods, urban flooding and landslides. In a weather advisory issued by the National Weather Forecasting Centre, the Met Office said monsoon currents from the Arabian Sea are "continuously penetrating upper and central parts of the country" and are likely to strengthen over the weekend. It added that a western disturbance is expected to approach the upper parts of the country on Monday, with the combined weather systems likely to trigger widespread rainfall. According to the PMD, rain accompanied by windstorms and thunderstorms, with "scattered heavyfalls at times very heavy", is expected in Kashmir, including Neelum Valley, Muzaffarabad, Rawalakot, Poonch, Hattian Bala, Bagh, Haveli, Sudhnoti, Kotli, Bhimber and Mirpur, from the evening or night of July 18 until July 25, with occasional gaps.