Resolutions: 15, 5 and 1.667 km Grid size: 300x200, , 418x427, 373x382Dt = 60, 20, 6.67 seconds Starting time: 00Z 8/27/2005

Initial and Boundary Conditions: NCEP/GFS, with bogus but no data assimilation

WRF simulated

dBz-2 min

NASA AmesVisualization Group

Katrina 2005

Shape/size of the eye

Concurrent Visualization (NASA Goddard and Ames)

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Goddard Mesoscale Dynamic and

Modeling Group Website for mesoscale modeling group and cloud library http://portal.nccs.nasa.gov/cloudlibrary/index2.html

Tracks for Hurricane Katrina (2005) from the observation and five different WRF experiments using different microphysical schemes (from 00Z 8/27/2005 to 00Z 8/30/2005).

Good track forecast in 1st 24 h model integration (less than 25 km because imposed bogus)

All schemes’ simulated track is far west after landfall

Minimum sea level pressure (MSLP) from the observation and five different WRF experiments using different microphysical schemesSimilar temporal variation between model simulated and observed MSLP.

All 3ICE schemes over-estimated MSLP (~20-25 hPa), especially Lin scheme (45 hPa lower).

No ice case produced strongest hurricane (in the 1st 30 hours).

Hurricane Katrina (2005)Minimum sea level pressure (MSLP)

Tracks for Hurricane Katrina

Lin

Ice Free

Tao, W.-K., J. Shi, S. Chen, S. Lang, S.-Y. Hong, G. Thompson, C. Peters-Lidard, T. Matsui, A. Hou, S. Braun, and J. Simpson, 2009: Studying precipitation processes in WRF with Goddard bulk microphysics: Comparison with different microphysical schemes,, Mon. Wea. Rev., (in revision).