Effects of Synoptic Surveillance on model forecasts for
Hurricane Floyd.

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

Assessments for each forecast time at
September 09, 1999 18 Z
September 10, 1999 00 Z 06 Z 12 Z 18 Z
September 11, 1999 00 Z 06 Z 12 Z 18 Z
September 12, 1999 00 Z 06 Z 12 Z 18 Z
September 13, 1999 00 Z 06 Z 12 Z 18 Z
September 14, 1999 00 Z 06 Z 12 Z 18 Z
September 15, 1999 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 GFS and GFDL models for the Hurricane Floyd synoptic surveillance mission.


Figure 1b. Track forecast improvements for the GFS and GFDL models for the the Hurricane Floyd synoptic surveillance mission.


(a)


(b)

Figure 2. Forecast errors for the landfall of Hurricane Floyd at Alicetown, Eleuthera, 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.


(a)


(b)

Figure 3. Forecast errors for the landfall of Hurricane Floyd at Cherokee Sound, Abaco, 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.


(a)


(b)

Figure 4. Forecast errors for the landfall of Hurricane Floyd at Cape Fear, NC, 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.

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