if you connect the app, then click the gear on the top right, you can set the temperature and location
Hmm. I created one similar to yours but it has never run Even when I click the "Run now" it doesn't seem to do anything. Will keep trying though. Shame there's no support forum for IFTTT.
The whole check now button is a bit strange. It seems to ping the server to see if the applet is active, but doesn’t always run in.
I tested it by setting it at tomorrow’s minimum temp +1 and saving.
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It seems there is already a facility called Severe Weather Alerts.
Start with eg “Alexa tell me about severe weather alerts”.
It may need a bit more stuff setup than I currently have eg an option in notifications.
There are also ‘skills’ which draw on Met Office weather reports.
F