Sat, 30 Apr 2016
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 23/13
ALLDAYS 21/13
BEAUFORT WEST 19/04
BELA-BELA 21/11
BETHLEHEM 18/02
BISHO 19/06
BLOEMFONTEIN 18/03
CALVINIA 19/02
CAPE ST LUCIA 22/16
CAPE TOWN 17/09
CLANWILLIAM 21/08
DE AAR 19/03
DURBAN 19/12
EAST LONDON 19/10
ERMELO 17/05
FAURESMITH 18/01
FICKSBURG 17/02
GEORGE 16/08
GRAAF-REINETT 19/03
GRAHAMSTOWN 19/07
HERMANUS 16/08
JOHANNESBURG 16/06
JOUBERTINA 17/02
KIMBERLEY 20/05
KLERKSDORP 22/06
KOMATIPOORT 23/14
KROONSTAD 21/05
LADYSMITH 19/06
LANGEBAAN 18/09
LEPHALALE 23/13
LYDENBURG 17/09
MAFIKENG 22/10
MUSINA 23/15
NELSPRUIT 20/11
NEWCASTLE 22/05
OUDTSHOORN 20/06
PAARL 18/06
PHALABORWA 22/14
PIETERMARITZBURG 18/04
PLETTENBERG BAY 16/10
POLOKWANE 18/08
PORT ALFRED 19/09
PORT ELIZABETH 19/10
PORT ST JOHNS 18/12
POTCHEFSTROOM 21/07
PRETORIA 19/10
QUEENSTOWN 19/00
RICHARDS BAY 20/15
ROBERTSON 19/06
RUSTENBURG 19/12
SASOLBURG 20/06
SKUKUZA 23/15
SOWETO 15/06
SPRINGBOK 16/06
STILBAAI 16/09
SUTHERLAND 16/00
TZANEEN 17/12
ULUNDI 20/08
UMTATA 17/04
UPINGTON 24/07
VEREENIGING 19/06
VREDENDAL 16/04
VRYBURG 24/04
WELKOM 20/05
WITBANK 16/06
WORCESTER 19/08

 

| 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