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Visual Storm Warning Signals (Thailand)

Last modified: 2023-06-03 by zachary harden
Keywords: thailand | weather flags | visual storm warning signal |
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Introduction

According to this WMO page (PDF, link not working), Thailand uses two flags we know from the well-known US signal set (also PDF, also not working), plus a number of others which are specific. Basically there are two groups of signals, one set �indicating the locality of storms�, the other �intensity of storms� (correcting an obvious illogicality in the text). Both may be hoisted together however, while a special case is the signal for normal weather conditions.

Jan Mertens, 13 Apr 2008

Locality Flags

 [Area 1 Signal (Thailand)] 7:10
image by Eugene Ipavec, 19 Apr 2008

37a (yellow flag) concerns �Area 1: Gulf of Thailand east coast to Lat. 5�N and Long. 105�E�.

[Area 2 Signal (Thailand)] 7:10
image by Eugene Ipavec, 19 Apr 2008

38a (blue flag) concerns �Area 2: Gulf of Thailand west coast to Lat. 5�N�.

[Area 3 Signal (Thailand)] 7:10
image by Eugene Ipavec, 19 Apr 2008

43a (red flag) concerns �Area 3: Andaman Sea bounded by west coast of southern Myanmar, west coast of southern Thailand. Long. 97�E, Lat. 5�N and Lat. 14�N�.

[Area 4 Signal (Thailand)] 7:10
image by Eugene Ipavec, 19 Apr 2008

51a (blue flag pierced yellow) concerns �Area 4: South China Sea bounded by southern Viet Nam coast, Lat. 12�N, Lat. 5�N, Long. 105�E and Long. 112�E�.

Intensity Pennants

 [64 kt+ Typhoon Signal (Thailand)] 4:5
image by Eugene Ipavec, 19 Apr 2008

56a (red pennant): �Typhoon or cyclone or storm with wind speeds near center 64 kt and upwards�.

[34-63 kt Typhoon Signal (Thailand)] 4:5
image by Eugene Ipavec, 19 Apr 2008

36a (blue pennant): �Tropical storm or storm with wind speeds near center from 34 kt and over but not exceeding 63 kt�.

[>33 kt Typhoon Signal (Thailand)] 4:5
image by Eugene Ipavec, 19 Apr 2008

35a (yellow pennant): �Tropical depression or storm with wind speeds near center not exceeding 33 kt�.

There are two notes:

  • Note 1 specifies that �Signals indicating the occurrence of storms in the Gulf of Thailand and adjacent seas [are] to be displayed at: Port Area (Bangkok); and Bangkok Harbour Limit I (Pong Pachjamit Port, Pagklongsarn, Dhonburi).
  • Note 2 specifies that �Signals indicating the intensity and locality of storms will be hoisted on the same yard-arm with the pennant indicating the intensity and the flag indicating the locality of the storm. The flag is always hoisted below the pennant.�
[Normal Weather Conditions Signal (Thailand)] 4:5
image by Eugene Ipavec, 19 Apr 2008

Finally, �at normal weather conditions (no tropical depression of storm or typhoon) the white pennant with red circle (52a) will be displayed at the upper yard-arm at Bangkok Harbour Limit I (Pong Pachjamit Port, Pagklongsarn, Dhonburi)�.

Jan Mertens, 13 Apr 2008