Wyoming Upper Air Data Request

This example shows how to use siphon’s simplewebswervice support to create a query to the Wyoming upper air archive.

from datetime import datetime

from metpy.units import units

from siphon.simplewebservice.wyoming import WyomingUpperAir

Create a datetime object for the sounding and string of the station identifier.

date = datetime(2024, 9, 27, 0)
station = 'GSO'

Make the request (a pandas dataframe is returned).

df = WyomingUpperAir.request_data(date, station)

Inspect data columns in the dataframe.

print(df.columns)

Index(['time', 'longitude', 'latitude', 'pressure', 'height', 'temperature',
       'dewpoint', 'ice_point_temperature', 'relative_humidity',
       'humidity_wrt_ice', 'mixing_ratio', 'direction', 'speed', 'u_wind',
       'v_wind', 'station'],
      dtype='str')

Pull out a specific column of data.

print(df['pressure'])

0      981.0
1      965.0
2      945.0
3      925.0
4      913.0
       ...
150     61.0
151     60.0
152     58.2
153     58.0
154     57.9
Name: pressure, Length: 155, dtype: float64

Units are stored in a dictionary with the variable name as the key in the units attribute of the dataframe.

print(df.units)

{'pressure': 'hPa', 'height': 'meter', 'temperature': 'degC', 'dewpoint': 'degC', 'direction': 'degrees', 'speed': 'm/s', 'u_wind': 'm/s', 'v_wind': 'm/s', 'station': None, 'time': None, 'latitude': 'degrees', 'longitude': 'degrees'}

print(df.units['pressure'])

hPa

Units can then be attached to the values from the dataframe.

pressure = df['pressure'].values * units(df.units['pressure'])
temperature = df['temperature'].values * units(df.units['temperature'])
dewpoint = df['dewpoint'].values * units(df.units['dewpoint'])
u_wind = df['u_wind'].values * units(df.units['u_wind'])
v_wind = df['v_wind'].values * units(df.units['v_wind'])