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26 July 2011

SA Weather Satellite Image: 26 July 2011 15h00 SAST

Images: Eumetsat (Click on images for larger view.)

SAWDIS: An "eye" has formed of the coast of Kwazulu Natal.  It would appear that an extratropical cyclone has formed off-shore of Kwazulu Natal. Sometimes called mid-latitude cyclones or wave cyclones, are a group of cyclones defined as synoptic scale low pressure weather systems that occur in the middle latitudes of the Earth (outside the tropics) having neither tropical nor polar characteristics, and are connected with fronts and horizontal gradients in temperature and dew point otherwise known as "baroclinic zones"

Extratropical cyclones encompass a class of storms with many names. Although they are sometimes referred to as "cyclones", this is imprecise; cyclone applies to numerous types of low pressure areas. The descriptor extratropical signifies that this type of cyclone generally occurs outside the tropicswetropical cyclones" if extratropical transition has occurred. Weather forecasters and the general public often describe them as "depressions" or "lows". Terms like frontal cyclone, frontal depression, frontal low, extratropical low, non-tropical low and hybrid low are often used as well.

Heavy falls of rain expected along the coast between Durban and Kosi bay on the 26th and 27th July.

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