Table of Available Diagnostics

Variable Name

Description

Available Units

Additional Keyword Arguments

avo

Absolute Vorticity

10-5 s-1

eth/theta_e

Equivalent Potential Temperature

K

degC

degF

units (str) : Set to desired units. Default is ‘K’.

cape_2d

2D CAPE (MCAPE/MCIN/LCL/LFC)

J kg-1 ; J kg-1 ; m ; m

missing (float): Fill value for output only

cape_3d

3D CAPE and CIN

J kg-1

missing (float): Fill value for output only

ctt

Cloud Top Temperature

degC

K

degF

fill_nocloud (boolean): Set to True to use fill values for cloud free regions rather than surface temperature. Default is False.

missing (float): The fill value to use when fill_nocloud is True.

opt_thresh (float): The optical depth required to trigger the cloud top temperature calculation. Default is 1.0.

units (str) : Set to desired units. Default is ‘degC’.

cloudfrac

Cloud Fraction

%

vert_type (str): The vertical coordinate type for the cloud thresholds. Must be ‘height_agl’, ‘height_msl’, or ‘pres’. Default is ‘height_agl’.

low_thresh (float): The low cloud threshold (meters for ‘height_agl’ and ‘height_msl’, pascals for ‘pres’). Default is 300 m (97000 Pa)

mid_thresh (float): The mid cloud threshold (meters for ‘height_agl’ and ‘height_msl’, pascals for ‘pres’). Default is 2000 m (80000 Pa)

high_thresh (float): The high cloud threshold (meters for ‘height_agl’ and ‘height_msl’, pascals for ‘pres’). Default is 6000 m (45000 Pa)

dbz

Reflectivity

dBZ

do_variant (boolean): Set to True to enable variant calculation. Default is False.

do_liqskin (boolean): Set to True to enable liquid skin calculation. Default is False.

mdbz

Maximum Reflectivity

dBZ

do_variant (boolean): Set to True to enable variant calculation. Default is False.

do_liqskin (boolean): Set to True to enable liquid skin calculation. Default is False.

geopt/geopotential

Geopotential for the Mass Grid

m2 s-2

geopt_stag

Geopotential for the Vertically Staggered Grid

m2 s-2

helicity

Storm Relative Helicity

m2 s-2

top (float): The top level for the calculation in meters. Default is 3000.0.

lat

Latitude

decimal degrees

lon

Longitude

decimal degrees

omg/omega

Omega

Pa s-1

p/pres

Full Model Pressure

(in specified units)

Pa

hPa

mb

torr

mmhg

atm

units (str) : Set to desired units. Default is ‘Pa’.

pressure

Full Model Pressure (hPa)

hPa

pvo

Potential Vorticity

PVU

pw

Precipitable Water

kg m-2

rh

Relative Humidity

%

rh2

2m Relative Humidity

%

slp

Sea Level Pressure

hPa

hPa

mb

torr

mmhg

atm

units (str) : Set to desired units. Default is ‘hPa’.

T2

2m Temperature

K

ter

Model Terrain Height

m

km

dm

ft

mi

units (str) : Set to desired units. Default is ‘m’.

td2

2m Dew Point Temperature

degC

K

degF

units (str) : Set to desired units. Default is ‘degC’.

td

Dew Point Temperature

degC

K

degF

units (str) : Set to desired units. Default is ‘degC’.

tc

Temperature in Celsius

degC

th/theta

Potential Temperature

K

degC

degF

units (str) : Set to desired units. Default is ‘K’.

temp

Temperature (in specified units)

K

degC

degF

units (str) : Set to desired units. Default is ‘K’.

tk

Temperature in Kelvin

K

times

Times in the File or Sequence

xtimes

XTIME Coordinate

(if applicable)

minutes since

start of

model run

tv

Virtual Temperature

K

degC

degF

units (str) : Set to desired units. Default is ‘K’.

twb

Wet Bulb Temperature

K

degC

degF

units (str) : Set to desired units. Default is ‘K’.

updraft_helicity

Updraft Helicity

m2 s-2

bottom (float): The bottom level for the calculation in meters. Default is 2000.0.

top (float): The top level for the calculation in meters. Default is 5000.0.

ua

U-component of Wind on Mass Points

m s-1

km h-1

mi h-1

kt

ft s-1

units (str) : Set to desired units. Default is ‘m s-1’.

va

V-component of Wind on Mass Points

m s-1

km h-1

mi h-1

kt

ft s-1

units (str) : Set to desired units. Default is ‘m s-1’.

wa

W-component of Wind on Mass Points

m s-1

km h-1

mi h-1

kt

ft s-1

units (str) : Set to desired units. Default is ‘m s-1’.

uvmet10

10 m U and V Components of Wind

Rotated to Earth Coordinates

m s-1

km h-1

mi h-1

kt

ft s-1

units (str) : Set to desired units. Default is ‘m s-1’.

uvmet

U and V Components of Wind

Rotated to Earth Coordinates

m s-1

km h-1

mi h-1

kt

ft s-1

units (str) : Set to desired units. Default is ‘m s-1’.

wspd_wdir

Wind Speed and Direction (wind_from_direction)

in Grid Coordinates

m s-1

km h-1

mi h-1

kt

ft s-1

units (str) : Set to desired units. Default is ‘m s-1’.

wspd_wdir10

10m Wind Speed and Direction (wind_from_direction)

in Grid Coordinates

m s-1

km h-1

mi h-1

kt

ft s-1

units (str) : Set to desired units. Default is ‘m s-1’.

uvmet_wspd_wdir

Wind Speed and Direction (wind_from_direction)

Rotated to Earth Coordinates

m s-1

km h-1

mi h-1

kt

ft s-1

units (str) : Set to desired units. Default is ‘m s-1’.

uvmet10_wspd_wdir

10m Wind Speed and Direction (wind_from_direction)

Rotated to Earth Coordinates

m s-1

km h-1

mi h-1

kt

ft s-1

units (str) : Set to desired units. Default is ‘m s-1’.

z/height

Model Height for Mass Grid

m

km

dm

ft

mi

msl (boolean): Set to False to return AGL values. True is for MSL. Default is True.

units (str) : Set to desired units. Default is ‘m’.

height_agl

Model Height for Mass Grid (AGL)

m

km

dm

ft

mi

units (str) : Set to desired units. Default is ‘m’.

zstag

Model Height for Vertically Staggered Grid

m

km

dm

ft

mi

msl (boolean): Set to False to return AGL values. True is for MSL. Default is True.

units (str) : Set to desired units. Default is ‘m’.

Table of Subproduct Diagnostics

Some diagnostics (e.g. cape_2d) include multiple products in its output. These products have been broken out in to individual diagnostics to help those utilities that are unable to work with multiple outputs. These individual diagnostics can be requested like any other diagnostic using wrf.getvar(). These are summarized in the table below.

Variable Name

Calculated From

Description

Available Units

Additional Keyword Arguments

mcape

cape_2d

2D Max CAPE

J kg-1

missing (float): Fill value for output only

mcin

cape_2d

2D Max CIN

J kg-1

missing (float): Fill value for output only

lcl

cape_2d

2D Lifted Condensation Level

J kg-1

missing (float): Fill value for output only

lfc

cape_2d

2D Level of Free Convection

J kg-1

missing (float): Fill value for output only

cape3d_only

cape_3d

3D CAPE

J kg-1

missing (float): Fill value for output only

cin3d_only

cape_3d

3D CIN

J kg-1

missing (float): Fill value for output only

low_cloudfrac

cloudfrac

Cloud Fraction for Low Clouds

%

vert_type (str): The vertical coordinate type for the cloud thresholds. Must be ‘height_agl’, ‘height_msl’, or ‘pres’. Default is ‘height_agl’.

low_thresh (float): The low cloud threshold (meters for ‘height_agl’ and ‘height_msl’, pascals for ‘pres’). Default is 300 m (97000 Pa)

mid_thresh (float): The mid cloud threshold (meters for ‘height_agl’ and ‘height_msl’, pascals for ‘pres’). Default is 2000 m (80000 Pa)

high_thresh (float): The high cloud threshold (meters for ‘height_agl’ and ‘height_msl’, pascals for ‘pres’). Default is 6000 m (45000 Pa)

mid_cloudfrac

cloudfrac

Cloud Fraction for Mid Clouds

%

vert_type (str): The vertical coordinate type for the cloud thresholds. Must be ‘height_agl’, ‘height_msl’, or ‘pres’. Default is ‘height_agl’.

low_thresh (float): The low cloud threshold (meters for ‘height_agl’ and ‘height_msl’, pascals for ‘pres’). Default is 300 m (97000 Pa)

mid_thresh (float): The mid cloud threshold (meters for ‘height_agl’ and ‘height_msl’, pascals for ‘pres’). Default is 2000 m (80000 Pa)

high_thresh (float): The high cloud threshold (meters for ‘height_agl’ and ‘height_msl’, pascals for ‘pres’). Default is 6000 m (45000 Pa)

high_cloudfrac

cloudfrac

Cloud Fraction for High Clouds

%

vert_type (str): The vertical coordinate type for the cloud thresholds. Must be ‘height_agl’, ‘height_msl’, or ‘pres’. Default is ‘height_agl’.

low_thresh (float): The low cloud threshold (meters for ‘height_agl’ and ‘height_msl’, pascals for ‘pres’). Default is 300 m (97000 Pa)

mid_thresh (float): The mid cloud threshold (meters for ‘height_agl’ and ‘height_msl’, pascals for ‘pres’). Default is 2000 m (80000 Pa)

high_thresh (float): The high cloud threshold (meters for ‘height_agl’ and ‘height_msl’, pascals for ‘pres’). Default is 6000 m (45000 Pa)

uvmet_wspd

uvmet_wspd_wdir

Wind Speed

Rotated to Earth Coordinates

m s-1

km h-1

mi h-1

kt

ft s-1

units (str) : Set to desired units. Default is ‘m s-1’.

uvmet_wdir

uvmet_wspd_wdir

Wind Direction (wind_from_direction)

Rotated to Earth Coordinates

m s-1

km h-1

mi h-1

kt

ft s-1

units (str) : Set to desired units. Default is ‘m s-1’.

uvmet10_wspd

uvmet10_wspd_wdir

10m Wind Speed

Rotated to Earth Coordinates

m s-1

km h-1

mi h-1

kt

ft s-1

units (str) : Set to desired units. Default is ‘m s-1’.

uvmet10_wdir

uvmet10_wspd_wdir

10m Wind Direction (wind_from_direction)

Rotated to Earth Coordinates

m s-1

km h-1

mi h-1

kt

ft s-1

units (str) : Set to desired units. Default is ‘m s-1’.

wspd

wspd_wdir

Wind Speed

in Grid Coordinates

m s-1

km h-1

mi h-1

kt

ft s-1

units (str) : Set to desired units. Default is ‘m s-1’.

wdir

wspd_wdir

Wind Direction (wind_from_direction)

in Grid Coordinates

m s-1

km h-1

mi h-1

kt

ft s-1

units (str) : Set to desired units. Default is ‘m s-1’.

wspd10

wspd_wdir10

10m Wind Speed

in Grid Coordinates

m s-1

km h-1

mi h-1

kt

ft s-1

units (str) : Set to desired units. Default is ‘m s-1’.

wdir10

wspd_wdir10

10m Wind Direction (wind_from_direction)

in Grid Coordinates

m s-1

km h-1

mi h-1

kt

ft s-1

units (str) : Set to desired units. Default is ‘m s-1’.