[Ips-hf-warning] ASWFC HF DEPRESSION WARNING issued 0533 UT on 21 Apr 2026 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC HF RADIO COMMUNICATIONS WARNING 26/38
ISSUED AT 0533UT/21 APRIL 2026
BY THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE.

Southern Australian region MUFs are 30-40% depressed on UT day 
21-Apr. Depressions are expected to continue in southern Australia 
for the remainder of the UT day. Northern Australian MUFs are 
near predicted monthly values.

DEGRADED HF PROPAGATION CONDITIONS EXPECTED
FOR 21 APRIL 2026
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
_____________________________________________________________
21 Apr:    0          -40%      2  4  4  4  8  8 12 12

Australian Space Weather Forecasting Centre
Bureau of Meteorology
ASWFC at bom.gov.au
www.bom.gov.au | www.sws.bom.gov.au