Hi
I've devised a forecasting tool for my Fine Offset station, based on the Zambretti forecaster. I've been reading this topic with interest - https://cumulus.hosiene.co.uk/posting.php ... =11&t=2237
When the Cumulus forecaster considers whether the wind's 'dead calm' or not, is it average wind speeds that are considered or are gusts considered as well? I assume it's only a reading of 0.0 that's considered 'dead calm'?
In terms of air pressure, how far back does the forecaster look to decide what the trend is? What is considered to be rising/steady/falling? (E.g. more than 1.5mb could be rising.)
Thanks!
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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
Cumulus forecaster - wind speed and air pressure
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- Posts: 5
- Joined: Sun 26 Jun 2016 9:45 am
- Weather Station: Fine Offset WH1080
- Operating System: Windows 10
- Location: Chelmsford
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- Posts: 2
- Joined: Tue 03 Mar 2015 9:06 am
- Weather Station: WS-4000
- Operating System: Win 7
- Location: Heerhugowaard, Nederland
Re: Cumulus forecaster - wind speed and air pressure
I made a forecaster based on Sager and this uses pressure changes as follows:
> 1.4 rising rapidly
.7 to 1.4 rising
-.7 to .7 steady
-.7 to -1.4 falling
>-1.4 falling rapidly
Looking back one hour
> 1.4 rising rapidly
.7 to 1.4 rising
-.7 to .7 steady
-.7 to -1.4 falling
>-1.4 falling rapidly
Looking back one hour
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- Posts: 5
- Joined: Sun 26 Jun 2016 9:45 am
- Weather Station: Fine Offset WH1080
- Operating System: Windows 10
- Location: Chelmsford
Re: Cumulus forecaster - wind speed and air pressure
Hi
Thanks for that - I wasn't aware of the Sager forecaster.
I note it uses cloud cover as part of its input - is this something that weather stations measure using a UV sensor?
A little off-topic, but my station doesn't measure cloud cover so I was wondering whether I could work it out by somehow using a script that checks the intensity of the cloud on a satellite image for my area...
Thanks for that - I wasn't aware of the Sager forecaster.
I note it uses cloud cover as part of its input - is this something that weather stations measure using a UV sensor?
A little off-topic, but my station doesn't measure cloud cover so I was wondering whether I could work it out by somehow using a script that checks the intensity of the cloud on a satellite image for my area...
- PaulMy
- Posts: 3849
- Joined: Sun 28 Sep 2008 11:54 pm
- Weather Station: Davis VP2 Plus 24-Hour FARS
- Operating System: Windows8 and Windows10
- Location: Komoka, ON Canada
- Contact:
Re: Cumulus forecaster - wind speed and air pressure
Have you looked at https://cumulus.hosiene.co.uk/viewtopic.p ... btj#p90706
This uses the local METAR along with your station data.
I use it on my page http://www.komokaweather.com
Davis Station Forecast: Increasing clouds and warmer. Precipitation possible within 24 to 48 hours
Sager 12-24 Hour Forecast: Showers and warmer; No important change. Some tendency for slight increase in winds during day, diminishing in evening. South or Southwest winds.
Paul
This uses the local METAR along with your station data.
I use it on my page http://www.komokaweather.com
Davis Station Forecast: Increasing clouds and warmer. Precipitation possible within 24 to 48 hours
Sager 12-24 Hour Forecast: Showers and warmer; No important change. Some tendency for slight increase in winds during day, diminishing in evening. South or Southwest winds.
Paul
VP2+
C1 www.komokaweather.com/komokaweather-ca
MX https://komokaweather.com/cumulusmx/index.htm /index.html /index.php
MX https://komokaweather.com/cumulusmxwll/index.htm /index.html /index.php
MX https:// komokaweather.com/cumulusmx4/index.htm
C1 www.komokaweather.com/komokaweather-ca
MX https://komokaweather.com/cumulusmx/index.htm /index.html /index.php
MX https://komokaweather.com/cumulusmxwll/index.htm /index.html /index.php
MX https:// komokaweather.com/cumulusmx4/index.htm