Physics
Scientific paper
Jun 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3511802j&link_type=abstract
Geophysical Research Letters, Volume 35, Issue 11, CiteID L11802
Physics
1
Atmospheric Processes: Mesoscale Meteorology, Atmospheric Processes: Convective Processes, Atmospheric Processes: Tropical Meteorology
Scientific paper
The formation of Hurricane Katrina (2005) is simulated using COAMPS® with high resolution (27 km, 9 km and 3 km grid spacing). Whereas most Atlantic hurricanes form in conjunction with easterly waves, no clear synoptic-scale tropical disturbance was evident as a precursor for Katrina. The triply-nested simulation, initialized 66 h before Katrina was identified as a tropical depression, successfully predicts the location and timing of Katrina's formation in the 3 km domain. The organization of the cyclone is associated with concentrated precipitation resolved with microphysics in the southeast part of the circulation. The storm does not form in the 9 km domain when the Kain-Fritsch cumulus scheme and the microphysics are used. However, a separate simulation using microphysics alone in the 9 km domain captures Katrina's formation, though with less organized structure. This study suggests that explicitly resolving clouds in high-resolution models holds promise for predicting tropical cyclone (TC) formation.
Jin Hao
Jin Yi
Peng Melinda S.
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