HF Communications Warning

(last updated 02 Apr 2026 17:50 UT)

SUBJ: ASWFC PRELIMINARY HF RADIO COMMUNICATIONS WARNING 26/31 ISSUED AT 2255UT/01 APRIL 2026 BY THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE. A CME has arrived weaker and later than expected inducing little geomagnetic activity. Australian MUFs are now expected near predicted monthly values to 15% enhanced for 02-Apr. A coronal hole wind stream is expected to increase geomagnetic activity on 03-Apr. Southern Australian MUFs may become mildly (15%) depressed on 04-Apr. DEGRADED HF PROPAGATION CONDITIONS EXPECTED FOR 04 APRIL 2026 IF COMMS DIFFICULTIES EXPERIENCED TRY A LOWER FREQUENCY BAND A MORE DETAILED HF WARNING WILL FOLLOW IF DEPRESSIONS EVENTUATE. _____________________________________________________________

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