The Spread of Monsoon Rain in Pakistan
The rainfall in Pakistan caused by the monsoon system is
highly unpredictable, variable and unreliable, causing flooding in some years
and severe droughts in others.
When we get a general picture of the rainfall of a monsoon,
the first thing we notice is the unreliability of the rain in that country.
Only a very narrow strip of land cover stations such as Lahore, Sialkot,
Islamabad, Muzaffarabad, Murree, Abbotabad and Rawalakot receives steady
rainfall. Otherwise, 90 percent of Pakistan will miss either the monsoon rains
or very different precipitation, which leads to flooding, especially in the
southern city of Karachi.
The outer Himalayas, including the stations of Murree and
Kashmir, has more than 50 inches of rainfall. Then turn to Islamabad / Rawalpindi
stations and the Piedmontese plains of Punjab, including Sialkot. Central
Punjab, including Lahore, receives 15-20. Below Lahore to the coast there is
generally no significant rainfall. Also west of Lahore, the monsoon rain is
reducing to less than half the amount within 100 miles of Lahore. Throughout
South and West Punjab, Sindh, Balochistan and KPK (with the exception of the
mountainous areas where the monsoon rains) there is very little rainfall. The
amount they receive is 1-5 inches, which is agronomically not important. The
extreme west of Baluchistan, near the Iranian border, the southeast of Punjab
and the western Sind near the Indian border are practically deserts.
Just as the monsoon winds can not cross the high mountain
barriers in northern Pakistan, stations such as Chitral, Gilgit, Chillas,
Hunza, Skardu are virtually dry to the Khunjarab Pass and are completely out of
the pale monsoon system. There are even sand dunes in Gilgit that clearly show
the lack of rainfall.
For the variability of a Pakistani monsoon, the example of
Lahore will suffice. This station usually gets 15 inches of rainfall from a
monsoon. In August 1996, more than 30 cm fell in 24 hours! - So different is
the monsoon rain in Pakistan. The above example clearly shows that such floods
not only damage crops but also cause urban flooding that leads to damage to
life and property.
In short, the above discussion shows that except for a
narrow strip in northeastern Pakistan containing mountain stations facing the
monsoon wind direction, no rain of agricultural importance is received in
Pakistan.
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