Effects of Synoptic Surveillance on model forecasts for
Hurricane Irene.

Assessments for each forecast time at

August 12, 2005				18 Z
August 13, 2005	00 Z	06 Z	12 Z	18 Z
August 14, 2005	00 Z	06 Z	12 Z

Fig 1a. Track forecast errors for the no dropwindsonde (NO or NN) and the all dropwindsonde (AL) runs for the GFS and GFDL models for the Hurricane Irene synoptic surveillance missions.

Fig 1b. Track forecast improvements for the GFS and GFDL models for the Hurricane Irene synoptic surveillance missions.