Sun, 24 Sep 2017
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 18/11
ALLDAYS 23/14
BEAUFORT WEST 31/05
BELA-BELA 27/10
BETHLEHEM 25/07
BISHO 24/09
BLOEMFONTEIN 30/10
CALVINIA 26/09
CAPE ST LUCIA 27/19
CAPE TOWN 16/08
CLANWILLIAM 13/06
DE AAR 24/07
DURBAN 24/14
EAST LONDON 19/13
ERMELO 26/11
FAURESMITH 25/10
FICKSBURG 24/11
GEORGE 15/09
GRAAF-REINETT 20/06
GRAHAMSTOWN 16/08
HERMANUS 14/09
JOHANNESBURG 27/12
JOUBERTINA 14/05
KIMBERLEY 28/12
KLERKSDORP 30/15
KOMATIPOORT 33/15
KROONSTAD 28/15
LADYSMITH 30/13
LANGEBAAN 16/09
LEPHALALE 33/15
LYDENBURG 29/10
MAFIKENG 31/15
MUSINA 33/12
NELSPRUIT 28/07
NEWCASTLE 30/16
OUDTSHOORN 17/08
PAARL 13/07
PHALABORWA 33/14
PIETERMARITZBURG 31/13
PLETTENBERG BAY 17/11
POLOKWANE 31/09
PORT ALFRED 19/12
PORT ELIZABETH 17/12
PORT ST JOHNS 21/12
POTCHEFSTROOM 30/15
PRETORIA 29/12
QUEENSTOWN 26/06
RICHARDS BAY 28/16
ROBERTSON 13/07
RUSTENBURG 32/14
SASOLBURG 29/15
SKUKUZA 32/16
SOWETO 27/12
SPRINGBOK 26/10
STILBAAI 15/09
SUTHERLAND 11/-1
TZANEEN 32/10
ULUNDI 30/11
UMTATA 25/10
UPINGTON 25/10
VEREENIGING 28/15
VREDENDAL 13/07
VRYBURG 30/14
WELKOM 26/13
WITBANK 26/09
WORCESTER 13/06

 

| 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