TheGeoRoomClimatology

Definition of the Day
Atmospheric Instability
A condition in the atmosphere where air parcels are heated and therefore are warmer than the surrounding atmosphere resulting in unstable weather conditions such as heavy rains and hailstorms. See Atmospheric Stability & Instability

Inter-Tropical convergence zone

The ITCZ is a belt of low pressure that shifts following areas of highest insolation .NH and SH trade winds meet along this belt.When the sun is overhead at the Tropic of Capricorn ie summer in the S hemisphere,the ITCZ follows and the trade winds converge creating clouds with heavy rainfalls and thunderstorms.Most of Zimbabwe's rain comes from the ITCZ.While there's a low pressure South of the Equator,a high pressure is experienced in the North with clear skies.When the sun is overhead at the Tropic of Cancer the ITCZ again follows and the trade winds converge.South of the equator high pressure conditions prevail with clear skies.The ITCZ is mostly concetrated around areas near the equator.

ITCZ in Africa
Movement of the ITCZ along Africa img from edmc1.dwaf.gov.za



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