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Significant weather chart

Below is a forecast significant weather chart prepared by the World Area Forecast Centre at London for 8 a.m. Hong Kong time, 31 January 2001. The black thick lines with wind barbs indicate the location of jet streams and their maximum speeds, while the dash lines outline possible CAT areas. The red circle marks the location where CAT was reported by an aircraft near Wuhan, at 11:46 a.m. Hong Kong time, 31 January 2001.