Fri, 26 May 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 21/13
ALLDAYS 23/18
BEAUFORT WEST 38/13
BELA-BELA 27/17
BETHLEHEM 24/13
BISHO 30/15
BLOEMFONTEIN 29/16
CALVINIA 35/18
CAPE ST LUCIA 24/19
CAPE TOWN 28/14
CLANWILLIAM 37/18
DE AAR 33/18
DURBAN 24/18
EAST LONDON 23/17
ERMELO 19/13
FAURESMITH 31/16
FICKSBURG 26/12
GEORGE 25/15
GRAAF-REINETT 37/12
GRAHAMSTOWN 29/12
HERMANUS 27/14
JOHANNESBURG 20/14
JOUBERTINA 30/11
KIMBERLEY 33/18
KLERKSDORP 26/16
KOMATIPOORT 28/21
KROONSTAD 27/15
LADYSMITH 26/14
LANGEBAAN 24/16
LEPHALALE 28/18
LYDENBURG 23/16
MAFIKENG 25/16
MUSINA 26/20
NELSPRUIT 23/16
NEWCASTLE 25/15
OUDTSHOORN 38/15
PAARL 32/17
PHALABORWA 26/18
PIETERMARITZBURG 24/15
PLETTENBERG BAY 21/16
POLOKWANE 23/16
PORT ALFRED 24/16
PORT ELIZABETH 24/16
PORT ST JOHNS 25/18
POTCHEFSTROOM 25/16
PRETORIA 24/15
QUEENSTOWN 34/12
RICHARDS BAY 24/20
ROBERTSON 38/14
RUSTENBURG 26/17
SASOLBURG 22/15
SKUKUZA 28/21
SOWETO 20/14
SPRINGBOK 21/14
STILBAAI 24/17
SUTHERLAND 30/11
TZANEEN 20/16
ULUNDI 27/17
UMTATA 26/13
UPINGTON 36/24
VEREENIGING 22/14
VREDENDAL 30/12
VRYBURG 29/17
WELKOM 29/15
WITBANK 20/12
WORCESTER 36/14

 

| 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