Using Nushell and polars on weather data from open-meteo to find windy days

I windsurf and needed a way to get wind forecasts.

And recently a new feature was added to Nushell that makes it easy to consume the data from the Open-Meteo API.

First we find the data we need here: DMI Weather Model API | Open-Meteo.com

From that page we get the following url to the API:

https://api.open-meteo.com/v1/forecast?latitude=55.934&longitude=12.5048&hourly=wind_speed_10m,wind_direction_10m&wind_speed_unit=ms&timezone=auto&forecast_days=10&models=dmi_seamless

We can easily inspect this from Nushell like so:

http get https://api.open-meteo.com/v1/forecast?latitude=55.934&longitude=12.5048&hourly=wind_speed_10m,wind_direction_10m&wind_speed_unit=ms&timezone=auto&forecast_days=10&models=dmi_seamless

Let us save these data in a variable:

let wind = http get https://api.open-meteo.com/v1/forecast?latitude=55.934&longitude=12.5048&hourly=wind_speed_10m,wind_direction_10m&wind_speed_unit=ms&timezone=auto&forecast_days=10&models=dmi_seamless

This we now turn into a dataframe based on the colums:

let dfwind = $wind | get hourly | polars into-df --as-columns 

Finally, let us make the datetime relative to now:

let final = $dfwind | polars with-column ($dfwind | polars get time | polars as-datetime "%Y-%m-%dT%H:%M" ) --name datetime

We can then turn this dataframe back into stadard nu:

let nuwind = $final | polars into-nu

And then it is easy to find any datetimes with enough wind:

$nuwind | where wind_speed_10m > 5

Seems like I will have to wait a week to go wind-🏄:

╭───┬──────────────────┬────────────────┬────────────────────┬───────────╮
│ # │       time       │ wind_speed_10m │ wind_direction_10m │ datetime  │
├───┼──────────────────┼────────────────┼────────────────────┼───────────┤
│ 0 │ 2024-08-07T09:00 │           5.22 │                144 │ in a week │
│ 1 │ 2024-08-07T10:00 │           5.75 │                149 │ in a week │
│ 2 │ 2024-08-07T11:00 │           6.08 │                153 │ in a week │
│ 3 │ 2024-08-07T12:00 │           6.45 │                156 │ in a week │
│ 4 │ 2024-08-07T13:00 │           6.61 │                160 │ in a week │
│ 5 │ 2024-08-07T14:00 │           6.48 │                163 │ in a week │
│ 6 │ 2024-08-07T15:00 │           5.77 │                166 │ in a week │
╰───┴──────────────────┴────────────────┴────────────────────┴───────────╯

Note: The above polars flag --as-colums assume you have the latest Nushell and latest polars plugin.