Forecast Time

Figure 6. (a) Track of cycling data-assimilation experiments, including DARTNBNG, DARTNB, CYCLNBNG, CYCLNB, and the best track; the SLP field is obtained from the DARTNBNG at 0000 UTUC 14 September 2006; (b) the corresponding central pressure time series; and (c) track forecast errors for the four cycling data-assimilation experiments.

storm, with a radius of maximum wind of about 350 km and the maximum tangential wind just a little over 10 ms-1. The assimilation of GPSRO soundings does not seem to produce an appreciable improvement to the storm intensity and structure.

The corresponding plots of vorticity for DARTNB and CYCLNB are shown in Fig. 9.

Figure 6. (Continued)

Table 2. Track forecast errors averaged over different forecast periods for cold-start and cycling WRF 3D-Var experiments, and cycling WRF/DART experiments.

Experiment 3—24 h forecast 27—48 h forecast 51—72 h forecast 3—72 h forecast

Table 2. Track forecast errors averaged over different forecast periods for cold-start and cycling WRF 3D-Var experiments, and cycling WRF/DART experiments.

Experiment 3—24 h forecast 27—48 h forecast 51—72 h forecast 3—72 h forecast

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