Climatology of Pakistan and Regional Weather
This domain tests the seasonal regimes that shape operations from Karachi to Skardu.
Winter (December-March)
Western disturbances track from Iran and Afghanistan across Balochistan and the north, bringing rain to the plains and snow above roughly 1,500 m in Gilgit-Baltistan and Khyber Pakhtunkhwa. Punjab frequently experiences dense radiation fog and smog in December and January, with visibility below 500 m at Lahore and Faisalabad.
Pre-monsoon (April-June)
Intense heating builds a thermal low over Sindh and Balochistan. The Loo is a hot, dry westerly in the plains; dust storms and gusty winds are common. Jacobabad and Turbat frequently exceed 50°C, giving extreme density altitudes.
Monsoon (July-September)
Moist south-westerlies from the Arabian Sea and south-easterlies from the Bay of Bengal bring heavy rain to the sub-montane belt around Islamabad, Lahore and Peshawar, with flash flooding. The Arabian Sea spawns cyclones mainly in May-June and October-November.
Post-monsoon (October-November)
Retreating monsoon gives clearer skies, with occasional early western disturbances.
Worked example
In July, Islamabad reports a moist south-easterly flow with high humidity and towering cumulus by afternoon. Surface heating, monsoon moisture and orographic lift from the Margalla hills combine to produce thunderstorms, heavy rain and hail; plan arrivals for the morning and expect wind shear and microburst risk near convective cells.
Traps
Placing western disturbances in the monsoon; treating fog as a summer phenomenon in Punjab; assuming monsoon air arrives from Central Asia rather than the sea; ignoring that Quetta's altitude makes it far cooler than lowland Sindh at the same latitude.