URSIGRAM SYDNEY 23/0000UT DECEMBER 2025 GEOALERT SYD357 UGEOA 85303 51223 0000/ 4021/ 11231 22232 30231 99999 PLAIN MAGNETIC FORECAST: MINOR STORM due to CORONAL HOLE BT Australian Space Weather Forecasting Centre Bureau of Meteorology ASWFC at bom.gov.au www.bom.gov.au | www.sws.bom.gov.au