Hi! I’m developing a web app with Tempest forecast as it usualy works best for me.
I’m OK with most what I get from the REST API vs. what I need, bur I’m at a loss with precip parameter in hourly forecast. It looks like an hourly accumulation, but those numbers in mm are way too big…
For wednesday it seems there will be 47mm of rain in a single day…
I’ve tried weighted sum based on probability as well, but that doesn’t make sense much either.
What are those numbers?
Thank you!
how did you get these numbers? is it raining 24 hours per day? something might be wrong.
I got these from my better_forecast:
https://swd.weatherflow.com/swd/rest/better_forecast?station_id=174130&token=XXXX
The complete JSON for tomorrow stil says it will rain all day…
From the forecast / hourly / 13 / precip - that should be 00:00 to 01:00 tomorrrow. (it is now nearly 11:00). Then every hour represents an hour of tomorrow. From that JSON I get these numbers:
(for some reason as a new user I can’t upload the whole json as a txt file, but I do have it.
Yesterday it said 47mm, today it only says 42,8mm, but still…
JSON looks like this, hour 14 (local_hour 1) has precip: 2.23 etc…
Damn… so today so far (it is 11:27 AM) it did really fall 32.8 mm of rain…
The hourly distribution was way different, but still…
Will report back today if we get 40mm plus.
If we do, there is no mystery and once again Tempest / WeatherFlow has more accurete forecast than everyone else…
I’m not sure how to interpret the precip value. is it the expected amount of rain in that hour, or perhaps it needs to be multiplied with the probability as you did? which one adds up to the total expected for the day?
I honestly don’t know as well, It seems that is is the expected hourly amount of rain. On Wednesday we’ve had 38,4mm of rain in total (with a different hourly distribution)…
So the sum from Tempest was impressively close… especially considering most other models said around 4 - 8mm in the entire day…
It might have been a coincidence, but I’m leaving it in as it is…
Thanks!
