Maldives Meteorological Service

Criteria for MET Alerts and Warnings

Hazard CAP Categories of Severity
Minor
(Alert level 1, WHITE)
Moderate
(Alert level 2, YELLOW)
Severe
(Alert level 3, ORANGE)
Extreme
(Alert level 3, RED)
Heavy Rain and Flood 50 mm in 1hrs or
80 mm in 6 hours
70 mm in 1hrs or
100 mm in 6 hours
90 mm in 1hrs or
120 mm in 6 hours
180 mm in 6 hours
Thunderstorms (TS) Significant TS reported and evident from satellite/Radar/LDN Moderate TS observed or evident from satel- lite/Radar/LDN. Severe TS observed or evident from satellite/ Radar/LDN. ---
Wind and Seas 19-24 mph (past 3 hrs) or 22 – 27 mph (past 1hr), or forecast to meet this condition 25-30 mph (past 3 hrs) or 28 – 35 mph (past 1hr), or forecast to meet this condition 34-40 mph(past 3 hrs) or 36 – 42 mph (past 1hr), or forecast to meet this condition >40 mph (past 3 hrs) or >42 mph (past 1hr), or forecast to meet this condition
Squalls (Frequent Gust) 50 - 54 mph 55 - 62 mph 63 - 69 mph above 70 mph
Swell & Tidal Waves (observed or forecast) Observed or forecast (minor impact) Observed or forecast (affect at least 5 islands) Observed or forecast (affect at least 10 islands) Observed or forecast (extreme impact based)
Tropical Cyclone (TC) RSMC declare TC center in the box within lat’ S5-N12, lon’ E66-E81 TC track towards Maldives and expect to cross Maldives atolls in next 24hr TC track towards Maldives and expect to cross Maldives atolls in next 12hr TC track towards Maldives and expect to cross Maldives atolls in next 6hr
Earthquake occured Magnitude >6 within 400km of Maldives EEZ. Or mag>7 in Indian Ocean within 4000km of Maldives EEZ Magnitude >7 within 400km of Maldives EEZ. Or mag>8 in Indian Ocean within 4000km of Maldives EEZ Magnitude > 8 within 400km of Maldives EEZ. Or mag>9 in Indian Ocean within 4000km of Maldives EEZ Magnitude >9 within 400km of Maldives EEZ
Tsunami Magnitude >8 in Indian Ocean within 4000km of Maldives EEZ. Or confir- mation of Indian ocean wide Tsunami of low impact to Maldives Magnitude>9 in Indian Ocean within 4000km of Maldives EEZ. Or confir- mation of Indian ocean wide Tsunami of moder- ate impact to Maldives Confirmation of Indian ocean wide Tsunami of high impact to Maldives Confirmation of Indian ocean wide Tsunami of extreme impact to Maldives