Generic Space Environment Advisory
Issued by NWS

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NWXX04 KWNP 200105

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

2015 April 19 at 7:00 p.m. MDT (2015 April 20 0100 UTC)


Summary For April 13-19

Geomagnetic storms reaching G1 (minor) were observed on 15-16 April while G2 (moderate) storms were observed on 16 April. These storms were the result of a negative polarity coronal hole high speed stream (CH HSS).

Outlook For April 20-26

Geomagnetic storms reaching G1 (minor) are likely on 21-22 April with a slight chance for G2 (moderate) on 21 April due to a combination of CH HSS effects coupled with a coronal mass ejection (CME) impact midday on 21 April.

Current space weather conditions at, and

Data used to provide space weather services are contributed by NOAA,
USAF, NASA, NSF, USGS, the International Space Environment Service (ISES)
and other observatories, universities, and institutions. For more
information, including email services, see SWPC`s Space Weather
Advisories Web site or (303) 497-5127. is the U.S. government's official web portal to all federal, state and local government web resources and services.