Snow Watch 2013
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- Smurfatefrog
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Here's one stolen from FB
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- Smurfatefrog
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What are the odds of two VE members almost simultaneously posting Cathedral webcam shots of the snow at 8.30am on a Sunday morning? Apparently quite high!Smurfatefrog wrote: Too slow there Intrepid
What I find quite interesting is how Snowfall No 4 hit the Eastern Cape Berg, and a week later No 5 hits the Central and Northern KZN Berg...both leaving the other end pretty much untouched.
Take nothing but litter, leave nothing but a cleaner Drakensberg.
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YEAR......... SNOW EVENTS BEFORE MID MAY
2010 ...................................... 0
2011 ...................................... 2
2012 ...................................... 4
2013 ...................................... 5
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There has definitely been more rain so far this year than in the past few years.
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Here is the next 3 days suggested snowfall. Note, at this stage all of the snow will fall during Friday (17th May). Saturday and Sunday should be clear skies.
Suggested total accumulations from Mountain-Forecast:
Thabana Ntlenyana- 3cm
Giant's Castle- 5cm
Champagne Castle- 4cm
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JonWells wrote: It seems the cold fronts this year have managed to synchronize themselves with weekends!
There is something of an explanation for this.
In the southern African winter the sequence of weather is governed by the passage of waves in the winds at a height of about 10km. The general name for these features is Rossby Waves. It turns out there is a preferred sequence of 6 days (so quasi-phase locked to the weekend) to the procession.
Here is the scientific paper that first unlocked this interesting characteristic:
docs.lib.noaa.gov/rescue/mwr/101/mwr-101-08-0650.pdf
The work was based on spectral analysis of surface pressure observations.
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