Official Space Weather Advisory issued by NOAA Space Weather Prediction Center Boulder, Colorado, USA SPACE WEATHER ADVISORY OUTLOOK #15-12 2015 March 22 at 9:31 p.m. MDT (2015 March 23 0331 UTC) **** SPACE WEATHER OUTLOOK **** Summary For March 16-22 Category R1 (Minor) radio blackouts were observed on 16-17 Mar due to flare activity from active sunspot Region 2297. Category G4 (Severe) geomagnetic storms were observed on 17 Mar followed by G2 (Moderate) storms on 18 Mar and G1 (Minor) storms on 19-20 Mar due to the 15 Mar CME combined with southern polar coronal hole high speed stream effects. Category G2 (Moderate) geomagnetic storms were observed on 22 Mar due to a possible co-rotating interaction region. Outlook For March 23-29 Category G1 (Minor) geomagnetic storms are expected on 23 Mar and 28-29 Mar due to coronal hole high speed stream effects. 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 Thank you for using the Product Subscription Service. If you would like to remove a product subscription or update the personal information in your account, go to the Product Subscription Site. Please do not use the from address for correspondence, as it is not monitored. For comments or help, please contact SWPC Help.