WSDN31 EKCH 031837 EKDK SIGMET T01 VALID 031830/032030 EKMI- EKDK KOBENHAVN FIR FRQ TS FCST AT 1830Z WI N5451 E00936 - N5517 E01106 - N5430 E01128 - N5451 E00936 FL370 WKN FCST AT 2030Z WI N5514 E01015 - N5600 E01221 - N5536 E01252 - N5439 E01047 - N5514 E01015=