A strong Stratospheric warming event in the Upper atmosphere commenced July 28th 2013 with a hot spot in the upper stratosphere 01 and 10 hPa .. south west of the WA coast
and peaked 6 days later on the 3rd August 2013.
Here is a snap of the SSW / stratospheric temperature anomaly in the first week of August 2013
A strong heating anomaly at 10hPa and 01 hpa at least commenced around the 28th JULY 2013
How does this happen?
Warm air from the surface layer is thought to penetrate the stratosphere created ‘forcing’ at the surface layer.
However research is still young in this area.
SSW’s are rare in the Southern Hemisphere.
Wondering if this SSW event may be linked to a minus 4 ! AAO.
Discussed recently here
The AAO commenced a downward trend around July 16th 2013
… 2 weeks before the SSW anomaly became evident on the animation
and reached minimum around 16th August as the SSW event was subsiding
THe current SSW event is in the same location as the last weak SSW noted MAY 2013
A record of that May 2013 event is recorded here
The westerly/low pressure belt is quite swollen at the moment which you might expect for winter
Of Note is the center of the high pressure belt has shifted north .Also a characteristic of winter synoptics
and a very long cold front makes it as far north as South east QLD
It is possible the recent SSW event has assisted in this winter pulse and synoptic set up.
Here it is for the record anyway
STRATOSPHERIC INDICES by NOAA
Stratospheric home page
Stratospheric Circulation Monitoring
THe last SSW l noted was around MAY 2013
SSW EVENT in August 2013 in Southern Hemisphere is registering on OZONE mapping as a strong POSITIVE ANOMALY !!
SSW’s create OZONE????