Measuring Heatwaves and Their Impacts, Table 1 (continued)
Index
Description
Max.
temperature
Min.
temperature
Relative
humidity Other
Intensity
output
Reference
40.6
C
(105
F). T a is
based on the
relationship
between
humidity and
temperature and
is based on
human heat
exchange. Also
referred to as the
heat index
Daytime high
and nighttime
low heat index
(T a max/min)
The heat index
(T a ) is expected
to reach 40.6
C
with a minimum
temperature not
below 26.7
C
over a period of
at least 48 h
X
X
X
Robinson
[19]
Heatwave
duration index
(HWDI)
The daily
maximum
temperature of
more than
5 consecutive
days exceeds
the normal
average
maximum
temperature by
5
C, the normal
period being
1961–1990
X
Frich et al.
[26]
Predicted mean
vote (PMV)
Predicts the
human thermal
comfort
response to
bioclimates in
terms of a
psychophysical
scale
X
X
Fanger
(1970) cited
by Perkins
and
Alexander
[16]; Fanger
[27]
Physiological
equivalent
temperature
(PET)
A measure for
human thermal
comfort which
translates an
actual
bioclimate into
a relatable
indoor
environment in
which the same
thermal stress
would be
experienced
using human
X
X
Mayer and
Höppe [28]
(continued)
460
Measuring Heatwaves and Their Impacts