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February 5, 2009 Meeting Summary

Yihua Wu gave a presentation on his recent work determining the impact of the LSM on forecasted track and intensity and the impact of the land surface temperature bug in the nest domain for Hurricane Ike. Four runs were made: H883 contained the sfc T bug and featured the slab LSM, GFDL sfc layer scheme and GFS PBL scheme over land, and the GFDL and GFS sfc and PBL schemes over ocean. N883 had the same setup as H883, except it was run without the sfc T bug. N893 had the same setup as N883, except is used the Noah LSM over land. Finally, N696 was run without the sfc T bug, and used the Noah LSM, MYJ sfc layer and PBL scheme over land and GFDL and GFS schemes over ocean. Two runs for Hurricane Ike were made, 2008090200, where the storm was over open water in the Atlantic, and 2008091000, where the storm had just crossed Cuba on its way to Texas. Track and intensity plots for the 2008090200 run show all of the experiments clustered together to the south of the best track and weaker intensities than observed. The track plot for the 2008091000 run shows a more westerly curve by the models compared to observations. For intensities from this run, the H883 run produced the highest winds and deepest pressures, while the N883 and N893 runs showed similar values slightly stronger than observations. The N696 run produced the weakest storm. More graphical results from Yihua's work can be seen in slides 9-17 of his presentation (with his corrected map) located on the HWRF meeting website at :

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