RDPS 🅱#

BETA Requires MetPy >=1.6

This demonstrates using data from Canada’s GEM Regional or Regional Deterministic Prediction System (RDPS).

Data Sources

`prioriy=`	Data source	Archive Duration
`"mcs"`	Meteorological Service of Canada	Last 24 hours

Model Initialization

Model cyles every six hours.

Forecast Hour

For the most recent version of RDPS…

`fxx=`	Forecast lead time
`0` through `84`, step=1	hourly forecasts available

Products

`product=`	Product Description
`"10km/grib2"`	Regional domain

Variable and Level

You will need to specify the variable and level for each request.

NOTE: The organization of these files is different than other NWP products.

There are no index files provided.

Each GRIB2 file only contains one message. The variable name and level is in the file’s name.

Herbie requires you provide a keyword argument for both variable and level. Pay special attention to model description (linked above) to understand how the model data is organized. If you don’t provide input for variable or level, Herbie will give you some ideas. For example, variable=TMP and level=TGL_2 will give you the filename that contains
TMP_TGL_2

Note: This requires MetPy version 1.6 or greater which has the capability to parse the rotated latitude longitude map projection type (see MetPy/#3123).

[1]:

from herbie import Herbie
import xarray as xr
import numpy as np

import matplotlib.pyplot as plt
from herbie.toolbox import EasyMap, pc
import cartopy.crs as ccrs
import cartopy.feature as feature
import pandas as pd

recent = pd.Timestamp("now").floor("12h") - pd.Timedelta("12h")

[3]:

# Some examples

H = Herbie(
    recent,  # Datetime
    model="rdps",
    fxx=3,
    variable="AirTemp",
    level="AGL-2m",
)
H.grib

✅ Found ┊ model=rdps ┊ product=10km/grib2 ┊ 2026-Apr-16 12:00 UTC F03 ┊ GRIB2 @ local ┊ IDX @ None

[3]:

PosixPath('/home/meteo/kps5442/data/rdps/20260416/20260416T12Z_MSC_RDPS_AirTemp_AGL-2m_RLatLon0.09_PT003H.grib2')

[4]:

H = Herbie(
    recent,  # Datetime
    model="rdps",
    fxx=12,
    variable="GeopotentialHeight",
    level="IsbL-0500",
)
H.grib

✅ Found ┊ model=rdps ┊ product=10km/grib2 ┊ 2026-Apr-16 12:00 UTC F12 ┊ GRIB2 @ msc ┊ IDX @ None

[4]:

'https://dd.weather.gc.ca/20260416/WXO-DD/model_rdps/10km/12/012/20260416T12Z_MSC_RDPS_GeopotentialHeight_IsbL-0500_RLatLon0.09_PT012H.grib2'

[6]:

# View variable names
H.AVAILABLE_VARIABLES

[6]:

['AbsoluteVorticity',
 'AirTemp',
 'Albedo',
 'CAPE',
 'CIN',
 'CloudWater',
 'DewPoint',
 'DewPointDepression',
 'DownwardLongwaveRadiationFlux-Accum',
 'DownwardShortwaveRadiationFlux-Accum',
 'GeopotentialHeight',
 'Humidex',
 'KIndex',
 'LandWaterProportion',
 'LatentHeatNetFlux',
 'LiftedIndex-MU-VT',
 'NetLongwaveRadiationFlux-Accum',
 'NetShortwaveRadiationFlux-Accum',
 'PlanetaryBoundaryLayerHeight',
 'PrecipType-Instant',
 'Pressure',
 'RadiativeTemp',
 'RelativeHumidity',
 'Runoff-Accum',
 'SWEATIndex',
 'SeaIceFraction',
 'SeaWaterTemp',
 'SensibleHeatNetFlux',
 'ShowalterIndex',
 'SkyTransparencyIndex',
 'SnowDensity',
 'SnowDepth',
 'SoilTemp',
 'SoilVolumetricWaterContent',
 'SpecificHumidity',
 'StormRelativeHelicity',
 'StormSeverityIndex',
 'Thickness',
 'TotalCloudCover',
 'TotalTotalsIndex',
 'UVIndex',
 'UVIndex-ClearSky',
 'UVIndex-ClearSky-Max24h',
 'UVIndex-Max24h',
 'UpwardLongwaveRadiationFlux',
 'UpwardShortwaveRadiationFlux',
 'VerticalVelocity',
 'VerticalWindShear',
 'WindChill',
 'WindDir',
 'WindGust',
 'WindGust-Max',
 'WindGust-Min',
 'WindSpeed',
 'WindU',
 'WindV']

[7]:

# View level names
H.AVAILABLE_LEVELS

[7]:

['AGL-10m',
 'AGL-120m',
 'AGL-2m',
 'AGL-40m',
 'AGL-80m',
 'DBS-0to10cm',
 'DBS-0to1cm',
 'EAtm',
 'EtaL-10000',
 'EtaL-6500',
 'IsbL-0001',
 'IsbL-0005',
 'IsbL-0010',
 'IsbL-0020',
 'IsbL-0030',
 'IsbL-0050',
 'IsbL-0100',
 'IsbL-0150',
 'IsbL-0175',
 'IsbL-0200',
 'IsbL-0225',
 'IsbL-0250',
 'IsbL-0275',
 'IsbL-0300',
 'IsbL-0350',
 'IsbL-0400',
 'IsbL-0450',
 'IsbL-0500',
 'IsbL-0550',
 'IsbL-0600',
 'IsbL-0650',
 'IsbL-0700',
 'IsbL-0750',
 'IsbL-0800',
 'IsbL-0850',
 'IsbL-0850to0700',
 'IsbL-0875',
 'IsbL-0900',
 'IsbL-0925',
 'IsbL-0950',
 'IsbL-0970',
 'IsbL-0985',
 'IsbL-1000',
 'IsbL-1000to0500',
 'IsbL-1000to0850',
 'IsbL-1015',
 'MSL',
 'NTAtm',
 'PVU-1',
 'PVU-1.5',
 'PVU-2',
 'Sfc',
 'TGL-10',
 'TGL-120',
 'TGL-2',
 'TGL-40',
 'TGL-80']

Plot data on Plate Carree projection#

[5]:

ax = EasyMap("50m").BORDERS().STATES(alpha=0.5).ax
p = ax.pcolormesh(ds.longitude, ds.latitude, ds.t2m, transform=pc, cmap="Spectral_r")
plt.colorbar(p, ax=ax, orientation="horizontal", pad=0.01, shrink=0.8)
ax.set_title(
    f"2-m Temperature\nValid {ds.valid_time.dt.strftime('%Y-%m-%d %H:%M').item()} UTC",
    loc="right",
    fontsize=10,
)
ax.set_title(f"{ds.model.upper()}: {H.product_description}", loc="left")
ax.gridlines()

[5]:

<cartopy.mpl.gridliner.Gridliner at 0x73a5af9674d0>

../../_images/gallery_eccc_models_rdps_9_1.png

RDPS 🅱#

Get the 2-metre temperature#

Plot data on Plate Carree projection#

Get 10-m U and 10-m V wind#

500 hPa Humidity and Geopotential Height#