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Latest Cumulus MX V3 release 3.28.6 (build 3283) - 21 March 2024
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(a patch is available for 1.9.4 build 1099 that extends the date range of drop-down menus to 2030)
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Latest Cumulus MX V3 release 3.28.6 (build 3283) - 21 March 2024
Cumulus MX V4 beta test release 4.0.0 (build 4019) - 03 April 2024
Legacy Cumulus 1 release 1.9.4 (build 1099) - 28 November 2014
(a patch is available for 1.9.4 build 1099 that extends the date range of drop-down menus to 2030)
Download the Software (Cumulus MX / Cumulus 1 and other related items) from the Wiki
How does Cumulus come up with these forecasts?
- aznetcowboy
- Posts: 361
- Joined: Fri 04 Jan 2013 6:03 pm
- Weather Station: Davis 6153 Vantage Pro2
- Operating System: Windows 10 Home 64-bit
- Location: West Bend, WI USA
- Contact:
How does Cumulus come up with these forecasts?
I have been noticing that the forecast images sure don't match up with the weather in my area. Like tonight, it is forecasting "Stormy with much precipitation". Not a chance of it!
It was very dry here with a temperature of 84 today and will be about 82 tomorrow and dry. Not a chance of any precipitation until this coming Friday. Until then we are expecting what we call chamber of commerce weather.
So, how does Cumulus come up with these forecasts?
It was very dry here with a temperature of 84 today and will be about 82 tomorrow and dry. Not a chance of any precipitation until this coming Friday. Until then we are expecting what we call chamber of commerce weather.
So, how does Cumulus come up with these forecasts?
- beteljuice
- Posts: 3292
- Joined: Tue 09 Dec 2008 1:37 pm
- Weather Station: None !
- Operating System: W10 - Threadripper 16core, etc
- Location: Dudley, West Midlands, UK
Re: How does Cumulus come up with these forecasts?
Compred to other sources your Pressure seems a bit low.
Have you set your relative (sea level) correctly ?
ATM you have 29.15 inHg, 'the web' says 30.15 inHg
Have you set your relative (sea level) correctly ?
ATM you have 29.15 inHg, 'the web' says 30.15 inHg
......................Imagine, what you will KNOW tomorrow !
- aznetcowboy
- Posts: 361
- Joined: Fri 04 Jan 2013 6:03 pm
- Weather Station: Davis 6153 Vantage Pro2
- Operating System: Windows 10 Home 64-bit
- Location: West Bend, WI USA
- Contact:
Re: How does Cumulus come up with these forecasts?
Okay, now I have to publicly display my total ignorance. Where do I make this adjustment? I have been looking through the different configuration pages and don't see a place to do that. I know, it is probably as obvious as the nose on my face, but I am still somehow missing it.beteljuice wrote:Compred to other sources your Pressure seems a bit low.
Have you set your relative (sea level) correctly ?
ATM you have 29.15 inHg, 'the web' says 30.15 inHg
Or is that it in the calibration page? If so, how do I have any idea what adjustment I need to make?
- beteljuice
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- Location: Dudley, West Midlands, UK
Re: How does Cumulus come up with these forecasts?
......................Imagine, what you will KNOW tomorrow !
- steve
- Cumulus Author
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Re: How does Cumulus come up with these forecasts?
Are you getting "Exceptional weather" that? If so, have you looked in the FAQ? http://wiki.sandaysoft.com/a/FAQ#My_for ... itation.22
Steve
- aznetcowboy
- Posts: 361
- Joined: Fri 04 Jan 2013 6:03 pm
- Weather Station: Davis 6153 Vantage Pro2
- Operating System: Windows 10 Home 64-bit
- Location: West Bend, WI USA
- Contact:
Re: How does Cumulus come up with these forecasts?
No, not exceptional weather, just "Stormy with much precipitation". Maybe for this coming weekend (if the TV weather people are correct). I have the pressure setting as 29.00 for the low and 31.00 for the high. Too extreme?steve wrote:Are you getting "Exceptional weather" that? If so, have you looked in the FAQ? http://wiki.sandaysoft.com/a/FAQ#My_for ... itation.22
- steve
- Cumulus Author
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Re: How does Cumulus come up with these forecasts?
Given that your pressure was apparently reading too low to begin with (as suggested by beteljuice above), yes. It's quite close to your lower threshold, hence the forecast.
Steve
- beteljuice
- Posts: 3292
- Joined: Tue 09 Dec 2008 1:37 pm
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- Location: Dudley, West Midlands, UK
Re: How does Cumulus come up with these forecasts?
Why did you change them ?I have the pressure setting as 29.00 for the low and 31.00 for the high. Too extreme?
The 'forecast' setting range should be 950 mb (28.05 inHg) > 1050 mb (31.01 inHg)
Use the correct figures for whichever unit you have checked - this unit is INDEPENDENT of the unit chosen for the Cumulus station settings and is ONLY used for the Zambretti forecast.
... but ...It all means nothing if you have correctly set your station Relative pressure.
Further, the figures you want to send to other sources are unreliable and may be rejected by some places who do a safety check against stations in same locality.
......................Imagine, what you will KNOW tomorrow !
- aznetcowboy
- Posts: 361
- Joined: Fri 04 Jan 2013 6:03 pm
- Weather Station: Davis 6153 Vantage Pro2
- Operating System: Windows 10 Home 64-bit
- Location: West Bend, WI USA
- Contact:
Re: How does Cumulus come up with these forecasts?
Well, it sure seemed like the range I had was not correct, so I made a change. I can do this range, no problem. I was finally able to get a good pressure reading from our airport, so I was able then to adjust the pressure in the configuration page. Now it seems much better. Our weather today has been very changeable, and I seem to be do quite well at the moment.beteljuice wrote:Why did you change them ?
The 'forecast' setting range should be 950 mb (28.05 inHg) > 1050 mb (31.01 inHg)
According to the forecasts, it will be an interesting week with even snow possible by the weekend, but I won't be home for about a week, so I won't know how well the Cumulus forecast will be. But it will be cold no matter what.
- beteljuice
- Posts: 3292
- Joined: Tue 09 Dec 2008 1:37 pm
- Weather Station: None !
- Operating System: W10 - Threadripper 16core, etc
- Location: Dudley, West Midlands, UK
Re: How does Cumulus come up with these forecasts?
It's your weather station that needs to be 'set', not Cumulus.adjust the pressure in the configuration page.
......................Imagine, what you will KNOW tomorrow !
- aznetcowboy
- Posts: 361
- Joined: Fri 04 Jan 2013 6:03 pm
- Weather Station: Davis 6153 Vantage Pro2
- Operating System: Windows 10 Home 64-bit
- Location: West Bend, WI USA
- Contact:
Re: How does Cumulus come up with these forecasts?
Understood and it has been done. All seems okay right now. This week will be a good test of it going from the 80's and sunny to the 40's with precipitation in just 6 days. Who was it that said the weather in the high desert was boring. Oh yes, it was me.beteljuice wrote:It's your weather station that needs to be 'set', not Cumulus.adjust the pressure in the configuration page.
- beteljuice
- Posts: 3292
- Joined: Tue 09 Dec 2008 1:37 pm
- Weather Station: None !
- Operating System: W10 - Threadripper 16core, etc
- Location: Dudley, West Midlands, UK
Re: How does Cumulus come up with these forecasts?
Hopefully your forecast (and your dew point, etc.) will now be more realistic
......................Imagine, what you will KNOW tomorrow !
- aznetcowboy
- Posts: 361
- Joined: Fri 04 Jan 2013 6:03 pm
- Weather Station: Davis 6153 Vantage Pro2
- Operating System: Windows 10 Home 64-bit
- Location: West Bend, WI USA
- Contact:
Re: How does Cumulus come up with these forecasts?
I've been comparing them against the NWS location at the Tucson International Airport, which is the official readings for here. So far, any errors are what would be expected from their location about 12 miles at the crow flies. We are about 700 feet higher and not as a desert environment as they are. I am convinced my readings are accurate for my location.beteljuice wrote:Hopefully your forecast (and your dew point, etc.) will now be more realistic
Thanks for the assistance you gave me in resolving my problem.