Effects of Synoptic Surveillance on model forecasts for
Hurricane Gabrielle.


Quicktime movie of DLM wind analyses
Quicktime movie of DLM wind data initial increments


Surveillance flights
September 13, 2001
September 14, 2001
September 15, 2001

Assessments for each forecast time at
September 13, 2001 18 Z
September 14, 2001 00 Z 06 Z 12 Z 18 Z
September 15, 2001 00 Z 06 Z 12 Z 18 Z
September 16, 2001 00 Z 06 Z 12 Z

Figure 1a. Track forecast errors for the no dropwindsonde (NO or NN) and the all dropwindsonde (AL) runs for the AVN, GFDL, and VBAR models for three Tropical Storm Gabrielle synoptic surveillance missions.

Figure 1b. Track forecast improvements for the AVN, GFDL, and VBAR models for the three Tropical Storm Gabrielle synoptic surveillance missions.

(a)
(b)

Figure 2. Figure 2. Forecast errors for the landfall of Tropical Storm Gabrielle at Venice, 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 AVN, GFDL, and VBAR models.


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