Regional Information on Heavy Rain and Thunderstorm

Notes:

• The map above displays the affected regions mentioned in the Localised Heavy Rain Advisory, the Special Announcement on Flooding in the northern New Territories, as well as the recorded regional rainfall. User can display the affected regions in the Thunderstorm Warning and lightning locations by selecting the corresponding layers. Please browse the following webpages for the relevant precautions and points to note for:
  • Localised Heavy Rain Advisory
  • Special Announcement on Flooding in the northern New Territories
  • Thunderstorm Warning
• When the Localised Heavy Rain Advisory is in force, the symbol will be displayed near the centre of the affected region. The 18 districts are delineated by blue thin lines.
• When the Special Announcement on Flooding in the northern New Territories is in force, the geographical region of concern will be outlined on the map in green, namely Yuen Long, Pat Heung, Kam Tin, San Tin, Ngau Tam Mei, Sheung Shui, Ta Kwu Ling and Sha Tau Kok (individually affected locations will be highlighted using green text in italic bold face). The symbol will be displayed near the centre of the affected region.
• District rainfall information is displayed in the form of “Rainfall Range” or “Icon”:
  • If “Rainfall Range” is selected, the minimum and maximum rainfall recorded in the past 60 minutes in the district will be displayed near the centre of the district.
  • If “Icon” is selected, different rainfall icons will be displayed near the centre of each district to show the category of the maximum rainfall recorded in the past 60 minutes in the corresponding district.
  • The above district rainfall information is provisional and only limited validation has been carried out. If the symbol M appears, it means that the system concerned is under maintenance and data are temporarily not available.
• When the Thunderstorm Warning is in force, the affected region will be shaded in yellow.
• If “Lightning Location” is selected, the location of cloud-to-ground lightning strokes in the past 30 minutes will be displayed on the map when there is lightning.

Please visit the following webpages for:

• Today's Weather Warnings and Signals Record
• Special Weather Tips
• Rainfall recorded in various regions of Hong Kong
• Cloud-to-ground lightning count distribution over Hong Kong in the past hour

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