Figure 3. Flow chart of extreme heat event (EHE, 25 June – 02 July 2021) and typical weather deaths included in the study. The BC Coroners Service (BCCS) investigated hundreds of deaths during the EHE (818 the week of 25 June – 01 July and 333 the week of 02 – 08 July). At the time of study, BCCS had not yet submitted 398 certificates of death to the BC Vital Statistics Agency, and those deaths had the ICD-10 code R99 (cause unknown or pending) as their underlying cause in the vital statistics data. Of the deaths certificates that BCCS had submitted, 284 were coded as X30 (extreme heat). BCCS has reported 562 heat-related deaths from 25 June – 02 July 202, but there is no way to assess which 278 deaths will eventually be coded as X30 and which 120 will have non-heat-related causes of death. The BCCS certificate of death can take months or years to submit, depending on the investigation. The X30, R99, and non-heat-related numbers here differ slightly from the numbers in Table 1 because excluded deaths are shown as the last step.