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#1445635 - 24/12/2017 11:51 Fire danger on local Wx pages
jim Offline
Weather Freak

Registered: 04/11/2001
Posts: 101
Loc: el dorado, Vic
Hi,
Currently, 11.30 am, on the Wangaratta Vic Weatherzone page the fire danger is shown as 14.9
On the BOM fire weather page it is shown as—Forest fire danger 12 and Grassland fire danger 4.
I have noted often that they differ more often than not.
I was wondering why this is?

Regards…

Jim
_________________________
With an eye to the weather!

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#1445638 - 24/12/2017 12:13 Re: Fire danger on local Wx pages [Re: jim]
jim Offline
Weather Freak

Registered: 04/11/2001
Posts: 101
Loc: el dorado, Vic
Following my earlier:
at 12 noon Weatherzone fire danger at Wangaratta = 19
BOM fire danger at Wangaratta Forest 16 grassland 6

Regards…

Jim
_________________________
With an eye to the weather!

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#1447117 - 03/01/2018 15:43 Re: Fire danger on local Wx pages [Re: jim]
jim Offline
Weather Freak

Registered: 04/11/2001
Posts: 101
Loc: el dorado, Vic
Hi again.
It would seem that I am the only one who cares about this or nobody knows what the answer is?
Today. Jan 3 2018 @ 1530 hrs:
WZ 28.4 C 26% WSW 24 _ 35 FDI 23.1
BOM 28 C 26% WSW 24 _ 35 FDI forest 19 Grassland 8
Consistently different.
I believe WZ uses the higher FDI (forest in this case) which is understandable but what I can't understand is why the consistent difference with what the BOM shows on the Fire Weather page?
Regards…
Jim
_________________________
With an eye to the weather!

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#1447128 - 03/01/2018 16:19 Re: Fire danger on local Wx pages [Re: jim]
Seabreeze Offline
Weatherzone Moderator

Registered: 18/09/2005
Posts: 10327
Loc: South West Rocks, NSW
I believe WZ and BOM use different formulas to calculate the Fire Danger Index.
_________________________
South West Rocks, NSW Mid North Coast:
April 2018 Rainfall: 47.8mm (Apr Avg. 169.9mm) // April 2018 Raindays: 7 (Apr Avg. 12.9 raindays)
Year-to-date Rainfall: 705.6mm (Jan-Apr Avg. 670.4mm) // Year-to-date Raindays: 46 (Jan-Apr Avg. 55.8 raindays)

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#1447612 - 06/01/2018 16:14 Re: Fire danger on local Wx pages [Re: jim]
jim Offline
Weather Freak

Registered: 04/11/2001
Posts: 101
Loc: el dorado, Vic
Thanks Seabreeze; it would look like that's the case.

regards…
_________________________
With an eye to the weather!

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#1449157 - 18/01/2018 08:36 Re: Fire danger on local Wx pages [Re: jim]
Kowree Offline
Weather Freak

Registered: 26/03/2012
Posts: 103
Loc: Utchee Creek via Innisfail.
See most of South Australia and the Mallee, Wimmera & South West districts of Victoria have a Fire Weather warning in place today - temps of over 40 degrees forecast and low humidity, poor things but the Tour Down Under is on around Adelaide and one of the requests of organizers is for sightseers to not park their cars in dry grass. Well lets hope this is not ignored however where else are they supposed to park?
Remembering the Black Tuesday bushfires near Port Lincoln SA, started 10th January 2005 which killed nine souls, injured many more, burnt 77,964 hectares, 47,000 stock losses (poor creatures, horrible way to go) and so much infrastructure losses etc.
This was started by a man parking on the side of road with his exhaust system igniting dry vegetation.
Let us hope motorists remember history.


Edited by Kowree (18/01/2018 08:37)
Edit Reason: Forgot to add location.

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#1449410 - 20/01/2018 09:54 Re: Fire danger on local Wx pages [Re: jim]
logansi Offline
Weatherzone Addict

Registered: 17/11/2014
Posts: 1026
Loc: Portland, Southwest - Victoria
The BOM version takes account of Drought Factor and KDBI which use recent rainfall and temperatures to work out how dry the bush and grassland is. The WZ number assumes worst case.
_________________________
Located in Moorabbin Vic or Portland Vic smile

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