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From: Bill Sloman <bill.sloman@ieee.org>
Newsgroups: sci.electronics.design
Subject: Re: OT: Typical Globlist
Date: Tue, 21 Jan 2025 01:55:03 +1100
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On 20/01/2025 11:53 am, john larkin wrote:
> On Sun, 19 Jan 2025 19:37:10 -0500, bitrex <user@example.net> wrote:
> 
>> On 1/19/2025 5:18 PM, Cursitor Doom wrote:
>>> On Sun, 19 Jan 2025 16:36:08 -0500, bitrex <user@example.net> wrote:
>>>
>>>> On 1/19/2025 4:49 AM, Liz Tuddenham wrote:
>>>>> Bill Sloman <bill.sloman@ieee.org> wrote:
>>>>>
>>>>> [...]
>>>>>> The proposition that radiant heat generated by one burning would set off
>>>>>> an adjacent house is pretty dumb. Fire codes are written to make sure
>>>>>> that houses aren't vulnerable in that way.
>>>>>
>>>>> In that case, what spread the fire?
>>>>>
>>>>>
>>>>
>>>> Embers can fly up to 20 km depending on fuel and weather conditions, and
>>>> during high winds fire breaks are useless.
>>>>
>>>> Observe embers from this doorbell cam:
>>>> <https://www.instagram.com/abc7marccr/reel/DEny6FGSX1f/>
>>>
>>> I don't doubt embers could have spread the original fires. What's
>>> puzzling is how the hell could they have got massive and out of
>>> control in the first place.
>>
>>
>> 2024 was globally the hottest year on record,
> 
> Maybe because we have thousands of times more sensors than we had in
> previous millenia.

It doesn't work that way.

> But an increase of a maybe a hundred milliKelvins does not explain the
> LA fires.

The average global temperature was 1.5 Kelvin above  the long term 
average (since the end of the last ice age), but fires reflect local 
temperatures, not the global average.

> and Los Angeles
>> experienced its warmest summer ever, following a decade of record heat.
>> It's mitigated somewhat when the winter rains show up but this year they
>> didn't show up.
>>
>> The hills above Altadena/Pasadena have had lots of burns controlled and
>> otherwise in recent years but after a certain percentage of the larger
>> trees are gone (from climate change or logging/development or otherwise)
>> they controlled burns don't do shit except let even more flammable
>> invasive species in. The hills up there were covered in foxtail:
>>
>> <https://californiaagnet.com/2021/04/20/the-many-faces-of-foxtails/>
>>
>> the stuff burns like newsprint
> 
> It takes real stupidity to let a house to be burned up by a grass
> fire.

What it takes is a high wind and very dry grass. If you mowed a couple 
of miles of dry grass you you might be able to create an effective 
fire-break, but mowers need flat ground.

-- 
Bill Sloman, Sydney