Heat wave indices

Metric	Name in hotspell	Description	Reference
CTN90PCT	ctn90pct	Tmin > calendar day 90th pt, 15-day window, at least 3 days	Perkins & Alexander 2013
CTN95PCT	ctn95pct	Tmin > calendar day 95th pt, 15-day window, at least 3 days
CTX90PCT	ctx90pct	Tmax > calendar day 90th pt, 15-day window, at least 3 days	Perkins & Alexander 2013
CTX95PCT	ctx95pct	Tmax > calendar day 95th pt, 15-day window, at least 3 days
Hot days	hot_days	Tmax > 35 °C	Collins et al. 2000
Hot events (day)	hot_events_daytime	Tmax > 35 °C, at least 3 to 5 days (default 3 days in hotspell)	Collins et al. 2000
Hot events (night)	hot_events_nighttime	Tmin > 35 °C, at least 3 to 5 days (default 3 days in hotspell)	Collins et al. 2000
SU (summer days)	summer_days	Tmax > 25 °C	Alexander et al. 2006
TN90P	tn90p	Tmin > calendar day 90th pt, 5-day window	Alexander et al. 2006
TR (tropical nights)	tropical_nights	Tmin > 20 °C	Alexander et al. 2006
TX90P	tx90p	Tmax > calendar day 90th pt, 5-day window	Alexander et al. 2006
WSDI	wsdi	Tmax > calendar day 90th pt, 5-day window, at least 6 days	Alexander et al. 2006