Effects of Synoptic Surveillance on model forecasts for
Hurricane Humberto.

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

Surveillance flights
September 23, 2001

September 24, 2001

**Surveillance flights**
September 23, 2001
September 24, 2001

Assessments for each forecast time at
September 23, 2001 18 Z
September 24, 2001 00 Z 06 Z 12 Z 18 Z
September 25, 2001 00 Z 06 Z 12 Z

**Assessments for each forecast time at**
September 23, 2001				18 Z
September 24, 2001	00 Z	06 Z	12 Z	18 Z
September 25, 2001	00 Z	06 Z	12 Z

Figure 1a. 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 two Hurricane Humberto synoptic surveillance missions.

Figure 1b. Figure 1b. Track forecast improvements for the AVN, GFDL, and VBAR models for the two Hurricane Humberto synoptic surveillance missions.

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Effects of Synoptic Surveillance on model forecasts for Hurricane Humberto.

Figure 1a. 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 two Hurricane Humberto synoptic surveillance missions.

Figure 1b. Figure 1b. Track forecast improvements for the AVN, GFDL, and VBAR models for the two Hurricane Humberto synoptic surveillance missions.

Effects of Synoptic Surveillance on model forecasts for
Hurricane Humberto.