How long must high temperatures persist for alert status?

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High Temperatures Must Persist for Three Consecutive Days to Trigger Alert Status

As of the morning of March 30, no areas in Malaysia had recorded a Level 2 heat wave. However, the Malaysian Meteorological Department (MetMalaysia) reported that the entirety of Perlis and nine districts within Kedah were under a Level 1 hot weather alert. This alert status is specifically designated when daily maximum temperatures consistently reach between 35 and 37 degrees Celsius, and this condition must be maintained for a minimum of three consecutive days to be officially recognised.
Alert Status Criteria

The alert status for hot weather is defined by MetMalaysia as a situation where daily maximum temperatures range between 35 and 37 degrees Celsius. This threshold is significant as it indicates a noticeable increase in heat that warrants public awareness.
Duration for Alert Recognition

For an area to be placed under this Level 1 alert status, the specified temperature range must not be a singular event. The meteorological department stipulates that this temperature condition needs to be recorded and sustained for at least three consecutive days before the alert is formally issued.
Distinction from Heat Wave Level

A more severe classification, Level 2 heat wave, is reserved for temperatures that exceed 37 degrees Celsius and reach up to 40 degrees Celsius. Similar to the Level 1 alert, this higher level also requires the elevated temperatures to persist for a minimum of three consecutive days to be officially designated as a heat wave.
Current Situation in Kedah and Perlis

As of the reporting period, Perlis and nine specific districts in Kedah were experiencing conditions that met the criteria for Level 1 hot weather alert. These districts include Sik, Padang Terap, Pendang, Pokok Sena, Kubang Pasu, Pulau Langkawi, Kota Setar, Kuala Muda, and Baling. Despite recent rainfall in some of these Kedah districts, the overall hot spell remains a point of observation for MetMalaysia.

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How long must high temperatures persist for alert status?

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