Perturbation size Fig. 5 Perturbation size at the nominal sampling time 06 September 1997 0000 UTC, from the previous day MRF ensemble forecast. The large hurricane symbol is the location of Tropical Storm Erika at the nominal time. The small hurricane symbols are the locations of Erika every 12 h before and after the nominal time. The black dots represent the locations of dropwindsonde observations.


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