International Workshop on Asian Monsoon Year (AMY08)

Extreme Weather Event:

A Case Report Of 2006/2007 Severe Floods In Johore, Malaysia

LING LEONG KWOK

MALAYSIAN METEOROLOGICAL DEPARTMENT

Extreme Weather Events

• Extreme rainfall event is getting more frequent in Malaysia

• 11 to 14 January 2007– Heavy Rainfall Caused Floods In Johore and South of Pahang

• 7 to 13 January 2007– Heavy Rainfall Caused Floods In Pitas, Kota Marudu, Beaufort and Sandakan, Sabah

• 6 to 8 January 2007– Heavy Rainfall Caused Floods In Kelantan and Terengganu

• 28 to 31 December 2006– Heavy Rainfall Caused Floods At Kota Marudu, Sabah

• 17 to 20 December 2006– Heavy Rainfall Caused Floods In Johore, Pahang, Negeri Sembilan and Malacca

• 6 December 2006– Severe Thunderstorms and Heavy Rainfall In Ipoh, Perak

Malaysia Map

Extreme Weather Events

• 10 May 2006– Strong Winds and Heavy Rainfall In Kuala Lumpur and Selangor

• 18 April 2006– Flash Floods and Heavy Rainfall In Johore Baru, Johore

• 6 April 2006– Flash Floods and Heavy Rainfall At Old Klang Road, Kuala Lumpur

• 14 to 17 December 2005– Heavy Rainfall Caused Floods In Perlis, Kedah, Kelantan and Terengganu

• 8 to 12 December 2004– Heavy Rainfall Caused Floods In Kelantan, Terengganu and Pahang

Number of Flood Evacuees50,000+

17 Dec 18 Dec 19 Dec 20 DecDecember

2006December Average

December Maximum

1) KUANTAN (1951) 80.0 84.2 79.2 189.2 658.2 620.0

(2001)

1471.1

2) MUADZAM SHAH (1984) 35.8 173.8 211.6 125.0 717.0 405.5

(1991)

849.2

3) MERSING (1951) 1.8 7.4 133.6 6.0 562.2 608.0

(1982)

1557.1

4) SENAI (1974) 94.6 128.0 236.0 40.0 907.2 243.2

(1991)

563.7

5) KLUANG (1974) 53.2 126.8 266.0 18.0 775.8 245.3

(1991)

642.1

24-hour Accumulated Station Rainfall Distribution (mm)

Extreme Event: 17/12/2006 – 20/12/2006

1 •

2 •

3 •

4 • 5 •

11 Jan 12 Jan 13 Jan 14 Jan

January

2007

January Average

January Maximum

1) KUANTAN (1951) 15.2 18.8 18.6 54.0 414.4 310.2

(1971)

934.7

2) MUADZAM SHAH (1984) 67.0 58.0 69.0 36.0 561.2 279.4

(1984)

643.9

3) MERSING (1951) 64.0 134.0 237.0 167.0 880.4 337.4

(1971)

834.1

4) SENAI (1974) 264.0 213.0 9.0 19.0 664.8 208.0

(2001)

478.2

5) KLUANG (1974) 171.0 222.0 42.0 16.0 563.6 169.7

(1987)

495.6

24-hour Accumulated Station Rainfall Distribution (mm)

Extreme Event: 11/01/2007 – 14/01/2007

1 •

2 •

3 •

4 • 5 •

Southeast Asia Monsoon System Changed

• Due to natural variability• Other likely factors:

El Nino – Southern Oscillation Indian Ocean DipoleMadden-Julian OscillationGlobal Warming

• Understanding is incomplete for weather forecaster operational application

• Further investigation is needed

500hPa Geopotential Height and Mean Sea Level Pressure

Cold Air Burst between 16/12/2006 and 17/12/2007

850hPa Wind

Radar Echoes: 16/12/2006 – 20/12/2006

211206 00UTC

201206 12UTC201206 06UTC201206 00UTC

181206 06UTC

161206 12UTC 171206 00UTC 171206 12UTC 181206 00UTC

181206 12UTC 191206 12UTC191206 00UTC

211206 0030UTC201206 1230UTC201206 0030UTC

191206 1230UTC191206 0030UTC181206 1230UTC

171206 0030UTC 171206 1230UTC 181206 0030UTC

MTSAT Imagery: 17/12/2006 – 20/12/2006

MMD Radar Coverage

MMD Upper Sonde Stations

SOUTH CHINA SEA

PENINSULAR MALAYSIA

SULU SEA

Thank You