Thunderstorm Warning Issuance Criteria

Warning Type Criteria
  • Warnings are issued when there are clear signs from meteorological station’s observation, radar echoes, satellite images, NWP products and upper air charts that indicate thunderstorms with rain intensity exceeding 20 mm per hour that occurred or expected to occur. Thunderstorm warning is a short period warning that not exceeding 6 hours for a single issue.
  • If the weather conditions are expected to worsened and exceed 6 hours, the warning can be upgraded to the continuous rain warning category.


Thunderstorm A weather event associated with the presence of lightning and thunder is a result of the formation of cumulonimbus clouds. Thunderstorms are usually accompanied with strong winds and heavy rain in a short period of time that can cause flash flooding. In extreme conditions, thunderstorms also produce hail and tornadoes (water tornadoes and land tornadoes).