30E GRR-30S GIJ-30SSW BDF-10ENE IOW-50ENE DBQ-30E GRR A description of the area of the storm, where GRR (Grand Rapids, MI airport), GIJ (Niles, MI VORTAC), BDF (Bradford, IL VORTAC), IOW (Iowa City, IA airport), and DBQ (Dubuque, IA airport) are ConTrol A'''reas (CTAs). AREA TS MOV FROM 25025KT. TOPS TO FL450. Thunderstorms moving from 250 degrees (roughly WSW) at 25 knots, covering an altitude from the cloud cover to 45,000 ft. See also AIRMET PIREP IWXXM VOLMET References External links IWXXM 1.0 Official WMO/ICAO representation of SIGMET information in XML Aviation meteorology Earth sciences data formats Weather warnings and advisories Aviation publications