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Heat waves
Kanza Saleem
&
Amna Rustam
Contents
 Introduction
 Types of heat waves
 Mechanism of heat waves
 Effects on human beings
 Case study on Karachi
 Causes of Karachi heat-waves
 Heat waves disasters in history
 Impacts of heat waves
Introduction
 It is a prolonged period of excessive heat, often
accompanied by excessive humidity.
 Heat waves occurs when there are a number of
consecutive days with above average temperature, that
the body can not tolerate.
  As temperature rises people animals and plants suffer
from heat stress.
 Apart from death more and more people also suffers
from sunstroke, severe dehydration, with vomiting and
high fever.
 And cause disruption to community infrastructure like
power supply, public transport and services. Also known as
“Silent Disaster”.
 The condition become more severe in May and June in
Pakistan.
Cont..
Categorization
Based on a physical meteorological perspective, heat-wave
events can be categorized into two broader types:
 Dry heat-waves
Characterized by dry weather conditions with clear skies
and large inputs of solar radiation.
Accompanied by windy conditions, which can increase heat
stress.
Dry heat waves usually occur in locations with a
continental or Mediterranean climate or where air is
warmed adiabatically.
 Moist heat-waves
Characterized by very warm, oppressive, humid
conditions throughout the day and night.
Often with nocturnal cloud cover, a feature that
prevents loss of heat accumulated throughout the day
and thus provides little night-time relief.
Such heat wave often a feature of mid-latitude
temperate and maritime climates and may be endemic to
some regions.
Mechanism
 A heat wave is caused by a system of higher
atmospheric pressure.
 In a high pressure system, air from upper levels of the
atmosphere descends and rotates outward.
 As it comes down, it becomes compressed, which
increases temperature and dries it out.
Effect on human beings
o Heat stroke
o Dehydration
o Sun burn
o Air pollution
o Drowning
Karachi 2015 heat wave
 During summer season, Karachi has displayed very
high occasional day temperatures up to 44.8°C .
 With the heat index ranging between 58.3°C -66.1°C
 This severe heat wave event persisted for
consecutive 5-days from 19-23 June.
 Over 2500 innocent souls have lost their valuable
lives to the sweltering heat.
Causes of Karachi heat wave
Following are the causes of heat-wave event in Karachi.
Comparison showing urbanization in Karachi
Some miserable heat-wave
disasters in history
 Europe, 2003:
About 71,310 people died
 Russia, 2010:
About 55,736 people died
 Europe, 2006:
About 3,418 people died
 India, 1998:
About 2,541 people died
 Pakistan, 2015:
About 2500 people died

Impacts of heat-waves
o Stress for outdoor workers.
oStress in animals.
o Damage to crops and vegetation.
o Infrastructure stress i.e. buildings, roads, rail and
other infrastructure.
o Increased risks for sporting and outdoor recreation
activities.
Cont..
o Increased energy demand, e.g. greater demand for air
conditioning.
o Shifts in tourism preferences due to higher
temperatures.
o Human morbidity and mortality, particularly among the
elderly & infirm.
Heat waves.ppt 1 (1) (1)

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Heat waves.ppt 1 (1) (1)

  • 2. Contents  Introduction  Types of heat waves  Mechanism of heat waves  Effects on human beings  Case study on Karachi  Causes of Karachi heat-waves  Heat waves disasters in history  Impacts of heat waves
  • 3. Introduction  It is a prolonged period of excessive heat, often accompanied by excessive humidity.  Heat waves occurs when there are a number of consecutive days with above average temperature, that the body can not tolerate.   As temperature rises people animals and plants suffer from heat stress.
  • 4.  Apart from death more and more people also suffers from sunstroke, severe dehydration, with vomiting and high fever.  And cause disruption to community infrastructure like power supply, public transport and services. Also known as “Silent Disaster”.  The condition become more severe in May and June in Pakistan. Cont..
  • 5. Categorization Based on a physical meteorological perspective, heat-wave events can be categorized into two broader types:
  • 6.  Dry heat-waves Characterized by dry weather conditions with clear skies and large inputs of solar radiation. Accompanied by windy conditions, which can increase heat stress. Dry heat waves usually occur in locations with a continental or Mediterranean climate or where air is warmed adiabatically.
  • 7.  Moist heat-waves Characterized by very warm, oppressive, humid conditions throughout the day and night. Often with nocturnal cloud cover, a feature that prevents loss of heat accumulated throughout the day and thus provides little night-time relief. Such heat wave often a feature of mid-latitude temperate and maritime climates and may be endemic to some regions.
  • 8. Mechanism  A heat wave is caused by a system of higher atmospheric pressure.  In a high pressure system, air from upper levels of the atmosphere descends and rotates outward.  As it comes down, it becomes compressed, which increases temperature and dries it out.
  • 9. Effect on human beings o Heat stroke o Dehydration o Sun burn o Air pollution o Drowning
  • 10. Karachi 2015 heat wave  During summer season, Karachi has displayed very high occasional day temperatures up to 44.8°C .  With the heat index ranging between 58.3°C -66.1°C  This severe heat wave event persisted for consecutive 5-days from 19-23 June.  Over 2500 innocent souls have lost their valuable lives to the sweltering heat.
  • 11.
  • 12. Causes of Karachi heat wave Following are the causes of heat-wave event in Karachi.
  • 14. Some miserable heat-wave disasters in history  Europe, 2003: About 71,310 people died  Russia, 2010: About 55,736 people died  Europe, 2006: About 3,418 people died  India, 1998: About 2,541 people died  Pakistan, 2015: About 2500 people died
  • 15.
  • 16. Impacts of heat-waves o Stress for outdoor workers.
  • 18. o Damage to crops and vegetation.
  • 19. o Infrastructure stress i.e. buildings, roads, rail and other infrastructure.
  • 20. o Increased risks for sporting and outdoor recreation activities.
  • 21. Cont.. o Increased energy demand, e.g. greater demand for air conditioning. o Shifts in tourism preferences due to higher temperatures. o Human morbidity and mortality, particularly among the elderly & infirm.