Thu, 02 Oct 2014
METROCAST | 




SA REGIONAL




INFORMATION




You are in: Weather > SA regional > Ecucation


INVERSION LAYERS

A surface inversion layer is a layer within the first 1500m of the atmosphere. It occurs when a air within a high pressure descends and as it descends, it warms the atmosphere, much like a bicycle pump warms up when you pump up a wheel. When air is compressed it will warm up. As the air descends from heights of about 12km it will warm and the warmest air will be found at this inversion layer which can be several meters thick. The air temperature then cools towards the surface.

So if one had to move from the surface of the earth when an inversion was present, you would notice that the air warms as you ascend and it will become warmer until you reach the inversion layer when it will start cooling again.

Inversion conditions usually suppress any convective development and usually very stable conditions occur with inversion conditions. Inversion layers occur throughout summer over CT. They also occur in winter on fine cold mornings when most of the smog is trapped within the lowest 200m above the ground.

The photograph below was taken by myself on Sunday 3 November 1985 in Constantia, Cape Town looking towards the NE at around 15:30. Large convective cumulonimbus clouds had built up during the day over the Boland mountains, but were severely restricted in their upwards growth by a very strong inversion, probably at about 2000m. This can be clearly seen from the very flat tops of the two massive clouds.

[ back ]

Search
Goodstuff



Goodstuff
ALEXANDER BAY 29/13
ALLDAYS 27/13
BEAUFORT WEST 20/08
BELA-BELA 28/12
BETHLEHEM 19/06
BISHO 21/09
BLOEMFONTEIN 22/08
CALVINIA 26/13
CAPE ST LUCIA 21/16
CAPE TOWN 21/13
CLANWILLIAM 26/15
DE AAR 21/08
DURBAN 21/14
EAST LONDON 20/13
ERMELO 19/08
FAURESMITH 21/09
FICKSBURG 20/05
GEORGE 23/09
GRAAF-REINETT 18/07
GRAHAMSTOWN 20/12
HERMANUS 22/12
JOHANNESBURG 22/10
JOUBERTINA 20/10
KIMBERLEY 24/11
KLERKSDORP 25/09
KOMATIPOORT 22/13
KROONSTAD 23/09
LADYSMITH 17/07
LANGEBAAN 24/15
LEPHALALE 28/12
LYDENBURG 21/08
MAFIKENG 26/11
MUSINA 26/14
NELSPRUIT 18/10
NEWCASTLE 19/09
OUDTSHOORN 23/11
PAARL 25/10
PHALABORWA 25/15
PIETERMARITZBURG 19/09
PLETTENBERG BAY 21/13
POLOKWANE 23/09
PORT ALFRED 21/13
PORT ELIZABETH 21/14
PORT ST JOHNS 20/10
POTCHEFSTROOM 23/09
PRETORIA 25/11
QUEENSTOWN 19/06
RICHARDS BAY 21/16
ROBERTSON 24/09
RUSTENBURG 25/11
SASOLBURG 23/10
SKUKUZA 22/13
SOWETO 22/09
SPRINGBOK 30/15
STILBAAI 21/12
SUTHERLAND 22/09
TZANEEN 23/12
ULUNDI 19/11
UMTATA 18/06
UPINGTON 26/15
VEREENIGING 24/09
VREDENDAL 28/15
VRYBURG 27/11
WELKOM 24/08
WITBANK 22/10
WORCESTER 25/09

 

| DISCLAIMER | FEEDBACK | ABOUT US | ADVERTISING | CONTACTS | SERVICES & PRODUCTS |

©COPYRIGHT 1995-2010, CUSTOMWEATHER,INC
San Francisco, California, USA
Your use of this site constitutes your acceptance of
the LEGAL RESTRICTIONS AND TERMS OF USE