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The Cyclone Warning System (Mauritius And Rodrigues)

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The Mauritius Meteorological Services shall –

(a) (i) in the event that a tropical depression, a moderate tropical storm, a severe tropical storm, a tropical cyclone, an intense tropical cyclone or a very intense tropical cyclone is likely to affect the Island of Mauritius or Rodrigues, issue a –

Class I

(A) cyclone warning class I not less than 36 hours, nor more than 48 hours, before the occurrence of gusts of 120 kilometres per hour;

Cyclone warning class II

(B) cyclone warning class II so as to allow, as far as practicable, 12 hours of daylight before the occurrence of gusts of 120 kilometres per hour;

Cyclone warning class III

(C) cyclone warning class III so as to allow, as far as practicable, 6 hours of daylight before the occurrence of gusts of 120 kilometres per hour;

Cyclone warning class IV

(D) cyclone warning class IV when gusts of 120 kilometres per hour are recorded in some places and are expected to continue;

(ii) following the issue of a cyclone warning class III or a cyclone warning class IV and subsequent observations indicating that the risk of cyclonic gusts of 120 kilometres per hour has abated and the cyclone is moving away, issue a safety bulletin for the purpose of –

(A) lifting the cyclone warning class III or cyclone warning class IV, as the case may be; and

(B) informing the public of the existence of any severe weather conditions associated with the cyclone and other environment risk, depending on the nature and extent of the damage occurred during the passage of the cyclone;

(iii) following the issue of a cyclone warning class I, a cyclone warning class II or a safety bulletin, as the case may be, issue a termination bulletin after consultation with, and following advice from, the National Crisis Committee to the effect that outdoor risks have considerably decreased;

(b) in the event of heavy rain, issue a –

  • heavy rain watch;
  • heavy rain warning, as far as practicable, not less than 30 minutes, nor more than 6 hours, before the occurrence of heavy rain;
  • torrential rain warning, following observations indicating that accumulated rainfall has reached 100 millimetres in a given region or is likely to reach 100 millimetres in a given region in the ensuing hour, and the rain is expected to continue;

(c) in the event of a heavy swell, issue a heavy swell warning, as far as practicable, about 12 hours in advance before swell waves of 4.0 metres or above are likely to affect the sea state in the vicinity of the Island of Mauritius, Rodrigues, Agaléga or St Brandon.

(d) in the event of a storm surge, issue a storm surge warning, which may be included in a cyclone warning referred to in paragraph (a), when a tropical depression, a moderate tropical storm, a severe tropical storm, a tropical cyclone, an intense tropical cyclone or a very intense tropical cyclone is evolving close to the Island of Mauritius, Rodrigues, Agaléga or St Brandon;

(e) in the event of a strong wind, issue a strong wind warning, as far as practicable, about 12 hours in advance before wind speed of not less than 40 kilometres per hour, with gusts of 90 kilometres per hour, is likely to affect the Island of Mauritius, Rodrigues, Agaléga or St Brandon.

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