Official Space Weather Advisory issued by NOAA Space Weather Prediction Center Boulder, Colorado, USA SPACE WEATHER ADVISORY OUTLOOK #15-1 2015 January 4 at 6:20 p.m. MST (2015 January 5 0120 UTC) **** SPACE WEATHER OUTLOOK **** Summary For December 29-January 4 G1 (minor) geomagnetic storm levels were reached on 29 December 2014 and again on 03 and 04 January 2015. This was due to prolonged periods of southward interplanetary magnetic field Bz associated with high speed solar winds from a pair of negative polarity coronal holes. R1 (minor) radio blackouts were observed on 03 and 04 January 2015 due to flare activity from active Region 2253. Outlook For January 5-11 G1 (minor) geomagnetic storm levels are expected on 05 January 2015 due to high speed solar winds from a negative polarity coronal hole. R1 (minor) radio blackouts are expected through the outlook period due to continued flare activity from Region 2253 and the return of old active Regions 2241 (S08, L=218) and 2242 (S18, L=240). 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.