4 ms·

I’m surprised how many places in the world measure rain in percentage chance. Must be a metropolitan concept. Here in Denmark, weather reports estimate mm/hr -

by drkrab 9mo ago

I’m surprised how many places in the world measure rain in percentage chance. Must be a metropolitan concept. Here in Denmark, weather reports estimate mm/hr - the amount of rain. Maybe it’s our agricultural inheritance?

gdulli 9mo ago
If you're deciding whether to dress and prepare for rain you're more curious about whether it will rain or not than the amount.
chrneu 9mo ago
Most places I look at report both probability and give a measurement prediction. So it would be like "60% chance of rain after 2pm, total amount less than 1/10th of an inch"
- tonfa 9mo ago
  Meteoswiss has timeserie histogram with of amount of rain with confidence intervals (10th and 90th quantile) It tells you all you need to know at a glance :) e.g. see https://www.meteoswiss.admin.ch/images/1904/website/weather/weather-and-climate-from-a-to-z/Wahrscheinlichkeit_von_Prognose_abb_4_en.jpg/Wahrscheinlichkeit_von_Prognose_abb_4_en.jpg https://www.meteoswiss.admin.ch/images/1904/website/weather/... (from https://www.meteoswiss.admin.ch/weather/weather-and-climate-from-a-to-z/probability-in-forecasts.html https://www.meteoswiss.admin.ch/weather/weather-and-climate-...)
antirez 9mo ago
The two things are not strictly related, you could have 30% chance of heavy rain, or 90% chance of light rain. Both are needed and many apps have both.
blackguardx 9mo ago
mm/hr is more useful for areas that get lots of rain. When I was living in Seattle, chance of rain was meaningless but mm/hr made the difference between being able to do an outside activity or not. In California, chance of rain makes sense because it rains very little.
Leftium 9mo ago
https://weather-sense.leftium.com https://weather-sense.leftium.com shows both mm/hr and percentage chance. I've noticed there is a correlation, but having both is useful: - Often there is a percentage chance, but the mm/hr is 0. At these times, it could rain but will probably be very light. - Less common, but sometimes there is 0% chance, but a non-zero mm/hr.
- hexbin010 9mo ago
  Chill a bit with the spamming ;) (7 times in this one post currently)

by drkrab 9mo ago

gdulli 9mo ago

If you're deciding whether to dress and prepare for rain you're more curious about whether it will rain or not than the amount.

chrneu 9mo ago

Most places I look at report both probability and give a measurement prediction. So it would be like "60% chance of rain after 2pm, total amount less than 1/10th of an inch"

tonfa 9mo ago
Meteoswiss has timeserie histogram with of amount of rain with confidence intervals (10th and 90th quantile) It tells you all you need to know at a glance :) e.g. see https://www.meteoswiss.admin.ch/images/1904/website/weather/weather-and-climate-from-a-to-z/Wahrscheinlichkeit_von_Prognose_abb_4_en.jpg/Wahrscheinlichkeit_von_Prognose_abb_4_en.jpg https://www.meteoswiss.admin.ch/images/1904/website/weather/... (from https://www.meteoswiss.admin.ch/weather/weather-and-climate-from-a-to-z/probability-in-forecasts.html https://www.meteoswiss.admin.ch/weather/weather-and-climate-...)

antirez 9mo ago

The two things are not strictly related, you could have 30% chance of heavy rain, or 90% chance of light rain. Both are needed and many apps have both.

blackguardx 9mo ago

mm/hr is more useful for areas that get lots of rain. When I was living in Seattle, chance of rain was meaningless but mm/hr made the difference between being able to do an outside activity or not. In California, chance of rain makes sense because it rains very little.

Leftium 9mo ago

https://weather-sense.leftium.com https://weather-sense.leftium.com shows both mm/hr and percentage chance. I've noticed there is a correlation, but having both is useful: - Often there is a percentage chance, but the mm/hr is 0. At these times, it could rain but will probably be very light. - Less common, but sometimes there is 0% chance, but a non-zero mm/hr.

hexbin010 9mo ago
Chill a bit with the spamming ;) (7 times in this one post currently)