Official Space Weather Advisory issued by NOAA Space Weather Prediction Center
Boulder, Colorado, USA

SPACE WEATHER ADVISORY OUTLOOK #13-20
2013 May 20 at 2:28 a.m. MDT (2013 May 20 0828 UTC)

**** SPACE WEATHER OUTLOOK ****

Summary For May 13-19

Multiple category R3 (Strong)  and R1 (Minor) radio blackouts were observed from 13 - 17 May due to flare activity from active sunspot Region 1748.  

A category S1 (Minor) solar radiation storm was observed from 15 - 18 May due to solar activity associated with Region 1748.

Several category G1 (Minor) geomagnetic storm periods occurred on 18 May as a CME, from 15 May,  became geoeffective.

Outlook For May 20-26

R1 (Minor) and R2 (Moderate), with R3 (Strong) radio blackouts are possible through the outlook period as Region 1748 persists and a new yet to be numbered active region rotates onto the visible disk.

Category S1 (Minor) solar radiation storms are possible through the outlook period as solar activity is expected to remain elevated.

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