Severe Weather Warning Criteria by Malaysia Meteorological Department

Criteria for Severe Weather Warning

Warning Stages Criteria  Possible Impact

Yellow

Possibility of a monsoonal surge in the next 24 to 48 hours.

Orange

Moderate monsoon rain is currently occurring or expected to occur in the next 24 hours
    or
Low-pressure system/tropical depression with sustained wind speed of 50 – 60 kmph accompanied by moderate to heavy rain
    or
Strong wind with sustained wind speed of 50-60 kmph (whole in motion; inconvenience felt when walking against wind)with slight to moderate rain and has lasted for the last 2 hours.
Flooding over low-lying areas and areas by the river banks.
Thatched/zinc roofs can be blown off by the wind.

Red

Heavy widespread monsoon rain is currently occurring or expected to occur in the next few hours.
    or
Tropical storm/typhoon with sustained wind speed of at least 60 kmph accompanied by moderate to heavy rain.
    or
Strong wind with sustained wind speed of at least 60 kmph (breaks twigs off trees; generally impedes progress when walking against wind; structure damage occurs) with moderate to heavy rain has lasted for the last 2 hours.
Flooding over low-lying areas and areas by the river banks.
Swift water currents can be dangerous to children playing besides monsoon drains and river banks.
Thatched/zinc roofs can be blown off by the wind.

 

Source: http://www.met.gov.my/index.php?option=com_content&task=view&id=739&Itemid=1129