The Gauteng Weather and Storm Warning Thread!

Gordon_R

Executive Member
Joined
Jul 5, 2009
Messages
6,959
Looking at the satellite loop this evening in IR... I'm not too sure what I'm looking at moving in from the east
Is it an air mass (considering the cloud hugging the escarpment is still visible) or is it fog.... :unsure:

@Geoff.D @Gordon_R


For those who don't know what I'm on about, watch this line move west
Looks like fog. There is no significant weather anywhere in the country for the next 3 days.

Edit: There is a specific EUMetsat image tuned for night-time fog observations: https://eumetview.eumetsat.int/static-images/MSG/RGB/FOG/SOUTHERNAFRICA/

Very cold over almost the entire country overnight and early tomorrow morning (Fri 14th).

tmin2m_030[20190615_0000].gif
 
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Segg

Expert Member
Joined
Feb 25, 2012
Messages
3,418
So the reason for this Mornings fog if anyone is interested, the dew point was around 3°C and the temperature on the ground sank to about 4°C - with light winds and a 1° spread fog is what you get

The past few days (and what is typically the case) the dew point has been around -5 to -10 with the minimum temperatures only getting down to 5 or 6 so a greater dewpoint spread
 

Gordon_R

Executive Member
Joined
Jul 5, 2009
Messages
6,959
So the reason for this Mornings fog if anyone is interested, the dew point was around 3°C and the temperature on the ground sank to about 4°C - with light winds and a 1° spread fog is what you get

The past few days (and what is typically the case) the dew point has been around -5 to -10 with the minimum temperatures only getting down to 5 or 6 so a greater dewpoint spread
If you really want to get technical, you can follow the (free) SAWS aviation reports, which predict fog (obviously!), and also show the temperature and dew point:
http://aviation.weathersa.co.za/#showTAF
http://aviation.weathersa.co.za/#showMetars

The dew point is currently 5C at ORT at 11am, which is quite high for a normally dry winter climate.

The fog and low cloud is predicted to clear during the day:
BECMG 1407/1409 3000 BR BKN005
BECMG 1409/1411 32010KT CAVOK
The fog is not overly impressive on a satellite image, but is clearly visible over parts of Gauteng and Mpumalanga, along with low clouds over Botswana and Zimbabwe:

MET9_721-southernAfrica_20190614_0600[crop_25X2].jpg
 
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