Tropical Cyclones Are we at risk?

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Presentation transcript:

Tropical Cyclones Are we at risk? http://earthobservatory.nasa.gov/Newsroom/NewImages/Images/seawifs_cyclone_dera.jpg

Questions What is a tropical cyclone? How does it threaten us? What parts of South Africa are threatened? How can we minimise the risk?

What is a Tropical Cyclone? relatively small, intensely developed low pressure cell occur over warm oceans diameter can range between 200 and 2000 km maximum wind speed exceeds 110 km/h Torrential rain

How does it threaten us? Floods Damage to roads, bridges, buildings Loss of farmland Silting of dams and river flood plains http://www.whistler.com/buzzard/photoj5.html

How does it threaten us? Wind damage Loss of crops Damage to buildings and communications Stormy seas http://coastalhazards.wcu.edu/StormDamage/Opal/opal1.jpg

What parts of SA are threatened? Where do they come from? How do they travel? http://www.weathersa.co.za/wfacts/9902-3.GIF

Conclusion – most storms miss us Few reach 25 S as mature storms Few reach 50 http://www.dmc.co.zw/images/saison_cyc_2001_2002.gif

Past events in South Africa

Demoina and Imboa (1984) Extensive flood damage in KZN

Eline (Feb 2000) Extensive flooding in Mozambique and Limpopo valley http://news.bbc.co.uk/1/hi/world/africa/649873.stm

Hudah (2002) Serious floods in Mozambique http://www.reliefweb.int/mapc/afr_sth/cnt/moz/moz_hudah.html

Japhet (2003) Flood disaster in Mozambique and Zimbabwe http://www.reliefweb.int/w/rwb.nsf/ (2003)

How can we minimise risk? Monitor information from the weather bureau Look at weather satellite images Avoid settling on northern coastal shores Don’t live on river banks in KwaZulu Natal

Conclusion We are not at high risk in this country But we should have flood relief programmes in place in KwaZulu Natal