Diagnosing variables

Gridpp can diagnose a number of humidity variables based on other variables.

Humidity

There are several humidity variables: dewpoint temperature, relative humidity, and wetbulb temperature. These can be diagnosed from each other in combination with temperature (and pressure for wetbulb):

temperature = 278 # K
dewpoint = 275 # K
rh = 0.9 # fraction
pressure = 101325 # pa
value = gridpp.dewpoint(temperature, rh)
value = gridpp.relative_humidity(temperature, dewpoint)
value = gridpp.wetbulb(temperature, pressure, rh)

Wind

Gridpp can convert from x and y components to wind_speed (in the future between direction as well):

x = 10
y = 5
wind_speed = gridpp.wind_speed(x, y)

Aviation

Gridpp can compute QNH from surface pressure and altitude.

pressure = 90000  # pa
altitude = 1000   # m
qnh = gridpp.qnh(pressure, altitude)