Weather features

ECMWF Weather features

The API downloads the following weather features:

name	unit	short name	description
2 metre dewpoint temperature	K	2d	Dewpoint temperature 2m above the ground
2 metre temperature	K	2t	Temperature 2m above the ground
10 metre U wind component	m/s	10u	Horizontal wind speed
10 metre V wind component	m/s	10v	Vertical wind gust in the last 6 hours
Precipitation type	code table (see description)	ptype	Describes the type of precipitation at the surface at the validity time. A precipitation type is assigned wherever there is a non-zero value of precipitation in the model output field (however small). The precipitation type should be used together with the precipitation rate to provide, for example, indication of potential freezing rain events. Precipitation type (0-8) uses WMO Code Table 4.201 Values of ptype defined in the IFS: 0 = No precipitation, 1 = Rain, 3 = Freezing rain (i.e. supercooled), 5 = Snow, 6 = Wet snow (i.e. starting to melt), 7 = Mixture of rain and snow, 8 = Ice pellets
Snow depth	m of water equivalent	sd	Depth of snow coverage
Snowfall	m of water equivalent	sf	Convective + stratiform snowfall. Accumulated from the beginning of the forecast.
Sunshine duration	s	sund	Time that radiation in the direction of the sun is above 120 W/m^2. Accumulated from the beginning of the forecast.
Surface net solar radiation	J/m^2	ssr	Net solar radiation at the surface. Accumulated from the beginning of the forecast.
Surface pressure	Pa	sp	Air pressure at ground level
Total cloud cover	(0 - 1)	tcc	Total cloud cover derived from model levels using the model's overlap assumption
Total precipitation	m	tp	Height of water in one m^2 from percipitation. Convective precipitation + stratiform precipitation (CP +LSP). Accumulated from the beginning of the forecast.
Visibility	m	vis	Visibility in meters.

In the data loading step (using WeatherExtractor) the following parameters are calculated:

name	unit	short name	description
Wind speed	m/s	ws	Calculated as a magnitude of (10 metre U wind component, 10 metre V wind component) vector.
Relative humidity	(0 - 1)	rh	Calculated from 2 metre dewpoint temperature and 2 metre temperature, based on the August-Roche-Magnus approximation and considered valid for: 0°C < 2t < 60°C, 0°C < 2d < 50°C.

NOTE:

Explanation of accumulated and instantaneous parameters can be found here

OWM Weather features

Example of the data can be found here.

name	unit	short name	description
Temperature	K	2t	Temperature 2m above the ground
Snowfall	sf	Snow volume for last 3 hours
Surface pressure	Pa	sp	Atmospheric pressure on the ground level
Total cloud cover	(0 - 1)	tcc	Cloudiness
Rain	m	tp	Rain volume for last 3 hours Accumulated from the beginning of the forecast.
Wind speed	m/s	ws	Wind speed