Effects of Synoptic Surveillance on model forecasts for
Tropical Storm Arlene.

Assessments for each forecast time at

June 09, 2005				18 Z
June 10, 2005	00 Z	06 Z	12 Z	18 Z
June 11, 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 Tropical Storm Arlene synoptic surveillance missions.

Fig 1b. Track forecast improvements for the GFS and GFDL models for the Tropical Storm Arlene synoptic surveillance missions.

Fig 2. Forecast errors for the landfall of Tropical Storm Arlene at Cabo Corrientes, Cuba, in the (a) cross- and (b) along-track directions for the no dropwindsonde (NO or NN) and the all dropwindsonde (AL) runs for the GFS and GFDL models.

Fig 3. Forecast errors for the landfall of Tropical Storm Arlene at Pensacola, FL, in the (a) cross- and (b) along-track directions for the no dropwindsonde (NO or NN) and the all dropwindsonde (AL) runs for the GFS and GFDL models.