The 'Massive' Gauteng Weather and Storm Warning Thread! The Sequel

wingnut771 said:
Aren't those reliable? What were parts availability like?
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It was pretty reliable and parts were fine, remember in 2015 they were still in the country, I sold it in 2020. Though miss it sometimes as it really was a car you could cruise in.
 
I accidentally ran the aircon all night with the windows and door open. The timer was supposed to switch it off around 1am but that didn't happen for some reason.
 
geezer said:
Some extreme temperatures from the past.

7 December 2015, 13:26 in the afternoon.
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11 December 2015, 10:15 the morning.
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06 January 2016, 12:41 afternoon.
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7 January 2016, 11:51 in the morning.
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7 January 2016, 14:03 afternoon.
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Temperature at the finish of the 2018 Ride Joburg, 18 November 2018.
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I feel we might be in for some of that this year or rather early next year
 
wingnut771 said:
Only need to stress when:
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A wet bulb temperature of 35C is a theoretical limit rarely experienced in any real world conditions, and certainly not in a semi-arid country such as SA. Even tropical conditions don't reach that high (at least not yet). There are a few such places in the Persian Gulf where a closed body of water is adjacent to a hot desert.

Edit: The actual safe threshold is quite a lot lower than 35C:
New Research Findings: Recent studies (such as those from Penn State University) indicate that the actual critical environmental limit for human heat and humidity tolerance is lower—around 30 °C to 31 °C in warm-humid conditions for young, healthy people—meaning dangerous physiological stress occurs well before hitting 35 °C.
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In the middle east people regularly work in temperatures (dry-bulb) in excess of 35 °C. Other than the very rare case of heat stroke, I never saw any adverse effects. It is bloody hot and you sweat a lot but as long as you keep your electrolyte and water intake high you are fine. I used to walk up to 10kM a day and up and down the equivalent of 10 storeys in up to and over 50 °C. It is not as extreme as people think if properly managed.
 
Captain Slog said:
In the middle east people regularly work in temperatures (dry-bulb) in excess of 35 °C. Other than the very rare case of heat stroke, I never saw any adverse effects. It is bloody hot and you sweat a lot but as long as you keep your electrolyte and water intake high you are fine. I used to walk up to 10kM a day and up and down the equivalent of 10 storeys in up to and over 50 °C. It is not as extreme as people think if properly managed.
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Yes, but there is a massive difference between wet and dry bulb.
 
ghaye said:
Yes, but there is a massive difference between wet and dry bulb.
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Wet bulb is an interesting parameter, with a long history, but it is fickle and hard to read accurately (particularly on automated weather systems). Most reports nowadays refer to dry bulb, and/or dew point and relative humidity. They are all inter-related, but not always easy to convert (ask me how I know!)

In aviation it is always dry bulb/dew point (since rising/cooling air will change its dry bulb temperature, but dew point will always remain fixed).

In public relative humidity is most quoted, but often misunderstood. My pet peeve is when minimum and maximum temperatures are quoted, along with a single value for relative humidity. This is nonsense, as the whole point of relative humidity it that it decreases as temperature increases.

If you ever see a forecast of 35C and 100% RH, you know that it is misleading or a lie! The day may start at 25%C and 100% RH, then rise to 35C and 50% RH, but at no point can it ever be 35C and 100% RH at the same time. End of rant...
 
Gordon_R said:
Wet bulb is an interesting parameter, with a long history, but it is fickle and hard to read accurately (particularly on automated weather systems). Most reports nowadays refer to dry bulb, and/or dew point and relative humidity. They are all inter-related, but not always easy to convert (ask me how I know!)

In aviation it is always dry bulb/dew point (since rising/cooling air will change its dry bulb temperature, but dew point will always remain fixed).

In public relative humidity is most quoted, but often misunderstood. My pet peeve is when minimum and maximum temperatures are quoted, along with a single value for relative humidity. This is nonsense, as the whole point of relative humidity it that it decreases as temperature increases.

If you ever see a forecast of 35C and 100% RH, you know that it is misleading or a lie! The day may start at 25%C and 100% RH, then rise to 35C and 50% RH, but at no point can it ever be 35C and 100% RH at the same time. End of rant...
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What if the forecast was wrong and it ends up being 45 with 50% RH?
 
A little overcast, a lot cooler and a stiff breeze this morning in Waverley. If this were everyday this summer, I would take it. But alas.
 
wingnut771 said:
What if the forecast was wrong and it ends up being 45 with 50% RH?
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You missed the point completely. Dew point temperatures are associated with large airmasses. They do not change much. If the dry bulb temperature reaches 45C, then the RH will drop to 25%, not 50%. In simple terms, it is physically impossible to have a dry bulb of 45C and a RH of 50%.
 
Flanders said:
Those temperature records were set when we had drought during the 2015-2016 season. I remember driving through the Free State in Nov 2015 and seeing endless large dust devils all the way to the horizon with crops looking knackered. I far prefer a more rainy season to drought.

I think we could well see some of those records broken this season.
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I have the exact same takeaway, the FS was in seriously poor condition during that time. Almost unrecognizable.
 
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