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

SPACE WEATHER ADVISORY BULLETIN #11- 1
2011 August 04 at 10:58 a.m. MDT (2011 August 04 1658 UTC)

**** GEOMAGNETIC STORM EXPECTED ****

Space Weather Bulletin August 4, 2011

NOAA Region 1261, very active over the past few days, produced the third
of a sequence of Coronal Mass Ejections (CMEs) and Solar Radio Blackout
Events early today. The net effect of that activity is convergent CMEs
expected to disturb the geomagnetic field in the early hours, Universal
Time (UTC) of August 5. G3 (Strong) Geomagnetic Storm conditions are
likely as well as a distinct chance of S2 (Moderate) Solar Radiation
Storm levels being surpassed.

NOAA 1261 is still in a prime position, relative to Earth, for more
geoeffective activity in the next few days.

New Solar Cycle 24 is in its early phase now, and this level activity is
typical for this time interval. Expect increased space weather activity
over the next few years as the Sun erupts more frequently.

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