HF Communications Warning

(last updated 14 Dec 2025 11:25 UT)

SUBJ: ASWFC HF RADIO COMMUNICATIONS WARNING 25/122 ISSUED AT 2318UT/13 DECEMBER 2025 BY THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE. Australian regional MUFs are expected to be initially 15-20% depressed on 14-Dec then gradually recovering and near predicted monthly values. DEGRADED HF PROPAGATION CONDITIONS EXPECTED FOR 14 DECEMBER 2025 IF COMMS DIFFICULTIES EXPERIENCED TRY A LOWER FREQUENCY BAND _____________________________________________________________ HF COMMUNICATIONS FORECAST (AUSTRALIAN/NEW ZEALAND REGION) FREQUENCY BANDS T-index MUFs 2 4 6 8 12 16 22 26 _____________________________________________________________ 14 Dec: 70 -20%/normal 2 4 6 8 8 12 16 16

Please note this icon refers to any current HF Depression Warning. For HF Fadeout Warnings, see here.