Table 3 Input parameters required to calculate WBGT^41,61 and their equivalent WRF outputs

Air temperature at 2 m

t2_k (K)

T2 (K)

Standard WRF output

Relative humidity at 2 m

rh (%)

rh_2m (%)

Calculated with the NCAR NCL script wrfout_to_cf

Surface pressure

psfc (Pa)

PSFC Surface pressure (Pa)

Standard WRF output

Wind speed at 10 m height

va (\({{m\; s}}^{-1}\))

WS (\({{m\; s}}^{-1}\))\(=\) \(\sqrt{({U10}^{2}+{V10}^{2})}\)

Calculated from standard WRF output U10 and V10

Cosine of solar zenith angle

czda (°)

COSZEN

cosine of solar zenith angle

Standard WRF output

Total sky direct solar radiation at surface (downward on a horizontal plane)

-

SWDDIR

Shortwave surface downward direct irradiance (\({{W\; m}}^{-2}\))

Not a standard WRF output, added in myoutfields.txt

Surface solar radiation downwards

swdnb (\({{W\; m}}^{-2}\))

SWDOWN (\({{W\; m}}^{-2}\))

downward short-wave flux at ground surface

Standard WRF output

Ratio of direct horizontal solar irradiance to the total horizontal solar irradiance

f

SWDDIR/SWDOWN

-

Surface solar radiation upwards

swupb (\({{W\; m}}^{-2}\))

SWUPB (\({{W\; m}}^{-2}\)) instantaneous upwelling shortwave flux at bottom

Standard WRF output

Surface thermal radiation downwards

lwdnb (\({{W\; m}}^{-2}\))

GLW (\({{W\; m}}^{-2}\))

downward long wave flux at ground surface

Standard WRF output

Surface thermal radiation upwards

lwupb (\({{W\; m}}^{-2}\))

LWUPB (\({{W\; m}}^{-2}\))

instantaneous upwelling longwave flux at bottom

Standard WRF output