Enhancement to Medium-level Significant Weather Chart

The medium level (FL100-250) significant weather chart covering China and Southeast Asia region issued by Hong Kong Observatory (HKO) is available 6 hours earlier than before since 19 May 2015. This extends the effective lead time of the chart from 9 hours to 15 hours. The table below listed the expected availability times of the medium level significant weather chart issued by HKO and other significant weather charts issued by World Area Forecast Centres (WAFCs):

Valid time of medium level significant weather chart issued by HKO and other significant weather charts issued by WAFCs	Available on AMIDS at around
0000UTC	0900UTC on previous day
0600UTC	1500UTC on previous day
1200UTC	2100UTC on previous day
1800UTC	0300UTC on the same day

The latest 4 sets of medium level (FL100-250) prognostic significant weather chart for area "China/SE Asia" as well as the prognostic significant weather chart issued by WAFCs can be accessed via AMIDS.

Medium-level Significant Weather Chart

Fig. 1 A Medium-level Significant Weather Chart with 15-hour lead time issued on 19 May 2015