The Bangkok Metropolitan Administration (BMA) has issued a severe weather warning for today, classifying the heat index as “very dangerous.” Both the general public and vulnerable groups are strongly advised to avoid all outdoor activities.
The Environment Department of the BMA reported at 7am that the forecast heat index for the capital has reached the highest alert level.
Residents are urged to monitor their health closely and seek immediate medical attention of they experience any unusual symptoms.
The heat index, often referred to as the "feels like" temperature, measures how hot it actually feels to the human body. It is calculated by combining air temperature with relative humidity.
This metric is considered a more accurate indicator of potential health risks than the maximum temperature alone, as high humidity hinders the body's ability to cool itself through sweating.
According to the BMA, the heat index risk levels are categorised into four distinct stages, based on the severity of the threat to health.
When the index is between 27.0 and 32.9°C, it is considered to be at the "Watch" level, when vulnerable groups are simply advised to drink water frequently.
The risk escalates to the "Warning" level between 33.0 and 41.9°C, requiring a reduction in outdoor activities during the peak hours of 11am to 4pm.
Conditions become "Dangerous" when the index reaches 42.0 to 51.9°C, at which point everyone should be aware of developing symptoms and vulnerable people should seek medical help if they feel unwell.
Finally, if the index hits 52.0°C or higher, it is classified as "Very Dangerous," and all outdoor activities must be strictly avoided to prevent life-threatening heat-related illnesses.
Exposure to temperatures exceeding the body's threshold can lead to direct and indirect health complications. Common symptoms include heat exhaustion, characterised by fatigue and dizziness, as well as physical irritations such as heat rashes, swelling or oedema.
High temperatures can also trigger muscle issues like heat cramps and, in the most severe cases, lead to heat stroke, which is a critical condition that requires immediate medical intervention.
Authorities advise staying in shaded or air-conditioned areas, wearing lightweight clothing and maintaining high hydration levels throughout the day.
