[Ips-hf-warning] ASWFC HF SHORTWAVE FADEOUT WARNING issued 0146 UT on 21 Jul 2026 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC HF RADIO COMMUNICATIONS WARNING 26/66
ISSUED AT 0145UT/21 JULY 2026
BY THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE.

Active region 4493 has shown significant growth and produced 
several M-class flares over the past 24 hours. Further M-class 
flares are forecast. Shortwave fadeouts are possible.

DEGRADED HF PROPAGATION CONDITIONS EXPECTED
FROM 21-22 JULY 2026
IF COMMS DIFFICULTIES EXPERIENCED TRY A HIGHER FREQUENCY BAND
_____________________________________________________________

SOLAR ACTIVITY FORECAST       HF COMMS FADEOUTS
21 Jul:  R1, chance of R2     Possible
22 Jul:  R1, chance of R2     Possible

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