Initial Maintenance of Tropical Cyclone Size in the Western North Pacific
Chueng, Kevin K.
Elsberry, Russell L.
MetadataShow full item record
A tropical cyclone (TC) size parameter, which is defined here as the radius of 15 m s21 near-surface wind speed (R15), is calculated for 145 TCs in the western North Pacific during 2000–05 based on QuikSCAT oceanic winds. For the 73 TCs that intensified to typhoon intensity during their lifetimes, the 33% and 67% respective percentiles of R15 at tropical storm intensity and at typhoon intensity are used to categorize small, medium, and large TCs. Whereas many of the small TCs form from an easterly wave synoptic pattern, the monsoon-related formation patterns are favorable for forming medium to large TCs. Most of these 73 TCs stay in the same size category during intensification, which implies specific physical mechanisms for maintaining TC size in the basin. The 18 persistently large TCs from the tropical storm to the typhoon stage mostly have northwestward or north-northwestward tracks, while the 16 persistently small TCs eithermove westward– northwestward in lower latitudes or develop at higher latitudes with various track types. For the large TCs, strong low-level southwesterly winds exist in the outer core region south of the TC center throughout the intensification period. The small TCs are more influenced by the subtropical high during intensification. The conclusion is that it is the low-level environment that determines the difference between large and small size storms during the early intensification period in the western North Pacific.
Monthly Weather Review, Vol. 138, August 2010, pp. 3207-3223
Showing items related by title, author, creator and subject.
Hensley, Jennifer M. (Monterey, California: Naval Postgraduate School, 2009-03);The objective of this thesis is to examine the predictions of the COAMPS-TC model for Typhoon Nuri during the THORPEX Pacific Asian Regional Campaign (T-PARC) and the Tropical Cyclone Structure 2008 (TCS-08) experiment ...
Intensification and structure change of super Typhoon Flo as related to the large-scale environment Titley, David W. (Monterey, California. Naval Postgraduate School, 1998-06-01);A Multi-Quadric (MQ) analysis is developed and compared with the four-dimensional data assimilation analyses of the structure of Typhoons Flo and Ed during the Tropical Cyclone Motion (TCM-90) field experiment. The MQ ...
An Observational Study of Tropical Cyclone Spinup in Supertyphoon Jangmi (2008) from 24 to 27 September Montgomery, Michael T.; Sanger, Neil T.; Smith, Roger K.; Bell, Michael M. (American Meteorological Society, 2014-01);An observational study of tropical cyclone intensification is performed using dropsondes, in situ flight-level data, satellite imagery, and Electra Doppler Radar (ELDORA) during the spinup of Tropical Storm Jangmi (2008) ...