17 December 2021
Tropical Depression 29W and northeast monsoon
Since the end of October, Malaysia had entered the wet northeast monsoon season, and the Malaysian Meteorological Department (MetMalaysia) had been issuing continuous heavy rainfall alerts on an almost weekly basis.
However, as Super Typhoon Rai swept over the Philippines, prevailing north-easterly winds in the South China Sea had been gaining strength, causing a tropical depression (29W) east of the Malay Peninsula to increase in wind strength and to carry more moisture than usual.
[2021-12-17 00:00 - 23:00 Local] Earth Nullschool archives three-hourly rainfall projections, denoted by purple, pink and yellow, providing a coarse-resolution estimate of where rain falls on. Winds are denoted by white lines. Source: Earth Nullschool
This prompted Malaysian officials to issue thunderstorm and continuous heavy rain warnings across multiple states, and also a typhoon advisory. Flooding was reported in Kelantan, Terengganu and Pahang states.
18 December 2021
Heavy rains and flash floods
Heavy downpour continued from 17 Dec, leading to sudden flash floods in parts of Kuala Lumpur and Selangor. In particular, Klang and Shah Alam experienced severe flooding. Lives of thousands of residents in Malaysia were disrupted and many vehicles were trapped in the rising floodwaters. The continuous rain had caused four main rivers to cross dangerous levels.
At 10.30pm, MetMalaysia placed almost the entire peninsula under some form of extended rain warning.
Authorities said that in parts of Selangor and Kuala Lumpur, where some of the worst flooding occurred, gauges recorded the day's rainfall to be as high as 363mm, exceeding the average rainfall for the entire month in Selangor, which is about 250mm. Authorities said this was beyond expectations and only occurs once every 100 years.
[2021-12-18 00:00 - 23:00 Local] Typhoon Rai fueling strong winds from the north-east, channeling moisture across the South China Sea, and causing torrential rain over the Malay Peninsula. Source: Earth Nullschool
19 December 2021
METMalaysia expects more heavy rain for the day
At 1.40am, MetMalaysia warned that the heavy and persistent rain that has led to severe flooding across several states is expected to continue and extended its danger or 'red alert' warning (rainfall exceeding 240mm a day) for multiple states.
[2021-12-19 02:00 Local] At 2.00am, north-east winds were still blowing strong across the South China Sea towards the peninsula, where 3-hour Precipitation Accumulation indicate heavy rainfall. Source: Earth Nullschool
A senior official at the country's Environment and Water Ministry commented that, "This is an exception because during the monsoon season, only states in the East Coast receive heavy rain. But this time, the entire peninsula, especially the central east coast and northern peninsula regions are receiving continuous heavy rain."
⭐️ Kyrios steps in to help reduce rainfall
As the severe rainfall phenomenon continues, many people from Malaysia called in to request for Kyrios' help to mitigate the relentless heavy downpour. On seeing many people stranded on rooftops due to rising floods, Kyrios agreed to intervene to reduce rainfall across Malaysia.
Weather conditions improved quickly upon intervention
Following Kyrios' intervention – as soon as 8.48pm in the evening – MetMalaysia issued a statement to end the "Continuous Rain Warning" that was posted earlier at 11.30am as weather conditions in Perlis, Kedah, Penang, Perak, Selangor, Kelantan, Terengganu and Pahang seemed to be improving.
[2021-12-19 02:00 - 23:00 Local] Within a few hours upon Kyrios' intervention, intense heavy rains (denoted by purple and pink) over the peninsula dissipated. Notice also how the north-easterly winds across the South China Sea were disrupted. Source: Earth Nullschool
20 December 2021
No rain following Kyrios' intervention, despite MET's forecasts of rain
According to MetMalaysia, the weather forecast for 20 Dec will see rain in the morning at various places including Perlis, Kedah, Penang, Perak, Selangor, Kuala Lumpur, Putrajaya, Negri Sembilan, Melaka and Johor. In the afternoon, rain is expected in Penang, Kedah, Perlis, the interior of Perak and Kudat, while thunderstorms were forecasted for Kuala Lumpur, the interior of Kelantan, Terengganu, Pahang, Selangor and Negri Sembilan. At night, rain was expected in Penang, Kedah, Perlis, and the interior of Perak.
However, rainfall data showed generally no rain falling across the Malay Peninsula on this day.
[2021-12-20 12:00 Local] Following Kyrios' intervention on 19 Dec, no significant rainfall was observed on 20 Dec. Source: Earth Nullschool
21 December 2021
⭐️ Kyrios intervenes to reduce floods in 3 days
Although the weather condition has improved in most states, flood waters in a number of places have been slow to recede and remained at high levels, despite a lack of rain. The tremendous amount of rainwater from December 17 and 18 had caused river banks to burst, and irrigation channels were inefficient in draining away the unexpected downpour fast enough. Garbage and debris further exacerbated the problem by clogging up drainage systems.
Emergency calls started pouring in once again for Kyrios' help. This time round, people were requesting Kyrios to ease the pressing flood situation. Kyrios agreed to intervene and assured that the floodwaters will recede within 3 days in Kuala Lumpur and seven other states, namely, Pahang, Selangor, Kelantan, Terengganu, Malacca, Negeri Sembilan, and Perak.
This also meant that Kyrios has to continue keeping heavy rains at bay.
[2021-12-21 12:00 Local] North-east monsoon winds gradually resumed, but remained weak. Rainfall continues to be light across Malaysia. Source: Earth Nullschool
22 December 2021
[2021-12-22 12:00 Local] As Kyrios' flood intervention is still ongoing, rainfall remains light. Source: Earth Nullschool
23 December 2021
Floods recede
In states where Kyrios intervened, meteorological data from weather stations have reported a gradual fall in water levels from "Dangerous" to "Safe".
24 December 2021
Floods in Malaysia have successfully abated
In the graphic below, flood water levels as reported by weather stations over the last 3 days show that water levels are receding and returning to normal levels.
This also marks the end of Kyrios' intervention for this round of torrential rains and floods. Kyrios will not be able to assist in every flood event. As such, households should look into flood preventive measures, and local governmental officials must work on improving drainage and warning systems.
Human activities such as burning fossil fuels, cutting down forests and farming livestock are the main drivers of climate change and weather-related disasters. It is the choices we make in our everyday life that lead to these activities, thereby causing Earth's systems to breakdown. Therefore, it is important to always be mindful of what we do and consume.
[2021-12-25 12:00 Local] As Kyrios' intervention wraps up on the 24th, northeasterly monsoon winds resumed blowing onto Malaysia's shores again. Source: Earth Nullschool