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WEEKEND STORMS ARE LIKELY: NOAA forecasters estimate a 70% chance of geomagnetic storms on June 4th and 5th when a solar wind stream hits Earth's magnetic field. Deja vu? This stream has been here before. On May 8th (Mother's Day), it sparked the strongest geomagnetic storm of 2016. During that G3-class event, auroras were photographed in the USA as far south as Kansas and Arkansas. This time, analysts expect the storm to peak at G2--not as strong as the Mother's Day Storm, but still worth watching. High-latitude sky watchers should be alert for auroras,especially in the southern hemisphere where darkening autumn skies favor visibility.
Moderate Geomagnetic Storm Watch in Effect
4 June UTS-day
Primary Area of Impacts
Poleward of 55 deg geomagnetic latitude
Power Systems: Power grid fluctuations; voltage alarms at higher latitudes
Spacecraft: Orientation irregularities; increased drag on low-Earth orbiters
Radio: high-latitude HF propagation fades
Other: Aurora may be visible as low as New York to Wisconsin to Washington state