Official Space Weather Advisory issued by NOAA Space Weather Prediction Center
Boulder, Colorado, USA
SPACE WEATHER ADVISORY OUTLOOK #26-17
2026 April 26 at 11:47 p.m. MDT (2026 April 27 0547 UTC)
**** SPACE WEATHER OUTLOOK ****
Summary For April 20-26
R1 (Minor) radio blackouts were observed on 23-26 Apr due to activity from Regions 4419. 4420, 4423, and 4425.
R2 (Moderate) radio blackouts were observed on 24 Apr and 26 Apr due to activity from Region 4419 and 4420.
R3 (Strong) radio blackouts were observed on 24 Apr due to activity from Region 4419.
G1 (Minor) geomagnetic storm levels were observed on 20-21 Apr due to influence from a coronal hole.
No other space weather storms were observed during the summary period.
Outlook For April 27-May 3
R1-R2 (Minor-Moderate) radio blackouts are likely over 27 Apr - 03 May due to the flare potential of multiple active regions.
No other space weather storms are expected during the outlook period.
Data used to provide space weather services are contributed by NOAA,
USAF, NASA, NSF, USGS, the International Space Environment Services
and other observatories, universities, and institutions. More
information is available at SWPC's Web site http://swpc.noaa.gov
