below zero

[Bob]

Hi Steve,

At one point there was some questrion as to whether Cumulus would show below zero temperatures with fine-offset.

Just to confirm it can!!!

Steve, with your wonderful manipulation of the weather, could you make it a bit warmer please!

Ta

Bob

[steve]

Thanks for confirming that, Bob.

Facilities for altering the weather rather than just recording it, will be coming in Cumulus 2.

[dane]

I am seeing some "funny" graphs after a frosty night:

2008-11-02_141528.png

The period 1:30 - about 9:00 shows no wind at all, and a wind direction of North all the time.
It was a very calm night - but that calm
Maybe the wind speed indicator was stuck due to frost.
But the wind direction indicator was not: the easyweather.dat file has several entries of other directions than north.
Steve: could it be that, when you see a wind speed of 0 you just decide a wind direction of 0?

[steve]

Steve: could it be that, when you see a wind speed of 0 you just decide a wind direction of 0?

No, I don't think I've implemented that, but it's actually correct, I am told. As part of my investigation into whether North should be zero or 360, I found that zero wind direction should be reported when wind speed = zero.

However, if the station is reporting an invalid bearing greater than 360, I change this to zero, so maybe this is what happened. And I've realised that with the change I've just done to report 360 instead of zero, I will change this zero into 360 also, so I need to have a look at that. Always complications...

Steve

[steve]

It occurs to me that if you still have the Diags file for the relevant start-up, we can see exactly what values the station was supplying for bearing at that time.

Steve

[dane]

here's the Diags file from the time, and an extract from the EasyWeather.dat file for the same period.
Ib

[steve]

It is supplying directions, but a speed of zero. I've realised that I effectively do log a bearing of zero when the wind speed is zero, because the beraing in this case is the average bearing, which takes into account the wind speed. So zero wind speed = zero average bearing, which is correct.

Except that I've just broken that in my changes to display zero as 360 . Fixed next build.

Steve

[harrym1byt]

I fired Cumulus up at around 21:00, it showed at 18:00 a glitch in the temperature graph. A sudden fall to -9.2 whereas the rest either side were 9.3 /9.2 plus values. I edited the single minus value in the Nov08 file to plus in the log, saved it - which sorted the graph out, then ran Cumulus to edit what had become a record low, in the 'edit' 'all time records'. I'm still stuck with a -9.2 in my 'Recent Extremes', is there a way to edited this out please?

[steve]

Harry, it would have been in today.ini. Depending on when you've run Cumulus since you posted, it may now be in yesterday.ini instead, and have also found its way into dayfile.txt

Steve

[harrym1byt]

Thanks Steve, all now sorted out - and before I started Cumulus up today.