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Tropical cyclone characteristics associated with extreme precipitation in the northern Philippines.

Authors :
Racoma, Bernard Alan B.
Klingaman, Nicholas P.
Holloway, Christopher E.
Schiemann, Reinhard K. H.
Bagtasa, Gerry
Source :
International Journal of Climatology. May2022, Vol. 42 Issue 6, p3290-3307. 18p.
Publication Year :
2022

Abstract

The Philippines is exposed to tropical cyclones (TCs) throughout the year due to its location in the western North Pacific. While these TCs provide muchneeded precipitation for the country's hydrological cycle, extreme precipitation from TCs may also cause damaging hazards such as floods and landslides. This study examines the relationship between TC extreme precipitation and TC characteristics, including movement speed, intensity and season, for westward-moving TCs crossing Luzon, northern Philippines. We measure extreme precipitation by the weighted precipitation exceedance (WPE), calculated against a 95th percentile threshold, which considers both the magnitude and spatial extent of TC-related extreme precipitation. WPE has a significant, moderate positive relationship with TC intensity with a non-significant, weak negative relationship with movement speed. When TCs are classified by intensity 1 day before landfall (or pre-landfall), Typhoons (1-min maximum sustained wind speed ≥64 knots) tend to yield higher WPE than non-Typhoons (<64 knots). On the other hand, when TCs are classified by pre-landfall speed, slow TCs (movement speed <11.38 knots) tend to yield higher WPE than fast TCs (movement speed ≥11.38 knots). However, the relationship between prelandfall TC intensity and WPE is more pronounced during June–September while there is no significant difference between the WPE of the southwest monsoon (June–September) and northeast monsoon (October–December) seasons. These results suggest that it is important to consider the pre-landfall cyclone movement speed, intensity and season to anticipate extreme precipitation of incoming TCs. A decision table considering these factors is devised to aid in TC extreme precipitation forecasting. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
08998418
Volume :
42
Issue :
6
Database :
Academic Search Index
Journal :
International Journal of Climatology
Publication Type :
Academic Journal
Accession number :
157310245
Full Text :
https://doi.org/10.1002/joc.7416