Official Space Weather Advisory issued by NOAA Space Weather Prediction Center Boulder, Colorado, USA SPACE WEATHER ADVISORY OUTLOOK #14-16 2014 April 20 at 11:21 p.m. MDT (2014 April 21 0521 UTC) **** SPACE WEATHER OUTLOOK **** Summary For April 14-20 G1 (Minor) geomagnetic storm conditions were observed on 20 April. R1 (Minor) radio blackout conditions were observed on 16 April. R2 (Moderate) radio blackout conditions were observed on 18 April. S1 (Minor) solar radiation storm conditions were observed 18-20 April. Outlook For April 21-27 There is a chance for R1-R2 (Minor-Moderate) radio blackouts during the outlook period. G1 (Minor) geomagnetic storm conditions are expected on 21 April. No S1 (Minor) or greater solar radiation 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 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.