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

SPACE WEATHER ADVISORY OUTLOOK #15-38
2015 September 21 at 12:15 a.m. MDT (2015 September 21 0615 UTC)

**** SPACE WEATHER OUTLOOK ****

Summary For September 14-20

R1 (Minor) radio blackouts were observed on 17 and 20 September due to flare activity from Regions 2415 and 2420.

G1 (Minor) geomagnetic storm levels were observed on 14, 19, and 20 September due to coronal hole high speed stream influence, prolonged southward Bz, and coronal mass ejection (CME) effects from the 18 September CME.

G3 (Strong) geomagnetic storm levels was observed on 20 September due to CME effects from the 18 September CME.

Outlook For September 21-27

There is a chance for R1-R2 (Minor-Moderate) radio blackouts for the forecast period (21-27 Sep) due to flare potential from Regions 2415 and 2420.

G1 (Minor) geomagnetic storm levels are likely on 21 and possible on 22-23 September due to CH HSS effects and a potential glancing blow from the 20 Sep CME, respectively.  

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

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