Space weather today in Alexandria, VA

Space weather in Alexandria, VA today

G1 minor geomagnetic storm forecast (NOAA, 2026-11-06 03:27 UTC). The planetary Kp index is 2 now and forecast to peak at Kp 5 in the next 24 hours. NOAA gives a 35% chance of R1–R2 radio blackouts today, 10% for R3 or stronger, and 5% for a solar radiation storm.

Radio: solar flares only black out HF radio on the half of Earth facing the Sun. The Sun is 61° below the horizon in Alexandria, VA now (10:32 pm local time). The biggest flare in the past 24 hours was M3.5 at 1:33 pm local time, while Alexandria, VA was in daylight, so HF radio here may have faded briefly. HF radio can fade at night during strong storms.

GPS and power: GPS is normally unaffected; strong G3+ storms can degrade precision positioning (surveying, farming RTK) for hours. Grid effects need G4–G5 storms here; the last big one was May 2024.

Aurora chance tonight in Alexandria, VA

Unlikely tonight (Kp 2.3 forecast; needs about Kp 8 at Alexandria, VA). At 48.0° N geomagnetic, Alexandria, VA needs about Kp 8 for aurora low on the northern horizon.

At the forecast Kp 5, the aurora's visible edge stays about 585 km north of Alexandria, VA.

NOAA 3-day space weather forecast

Chances that NOAA issues each level somewhere on Earth. Radio blackouts only affect the sunlit side; geomagnetic storms are global but strongest near the poles.

Strongest solar flares this week

C-class and stronger flares from the past 7 days, local time in Alexandria, VA.

• M3.5 flare peak Thu 1:33 pm, R1 minor radio blackout
• C5.6 flare peak Thu 9:51 pm
• C2.9 flare peak Thu 4:34 pm
• C2.5 flare peak Thu 7:24 pm
• C2.2 flare peak Wed 12:34 pm
• C1.3 flare peak Thu 5:31 pm
• C1.2 flare peak Thu 5:21 pm
• C1.2 flare peak Wed 1:54 am
• C1.1 flare peak Thu 12:00 pm
• C1.1 flare peak Tue 5:39 pm

What the scales mean

Space weather is the Sun's effect on Earth. NOAA rates it on three 1–5 scales. R (radio blackouts) comes from solar flares: X-rays reach Earth in 8 minutes and disrupt HF radio on the sunlit side for minutes to hours. S (solar radiation storms) comes from energetic protons a few hours later, a hazard for satellites, polar flights and astronauts. G (geomagnetic storms) comes 1–3 days after a coronal mass ejection or a fast solar-wind stream hits the magnetic field: it drives the aurora and can upset GPS, HF radio and power grids.

The Kp index (0–9) measures geomagnetic activity in 3-hour blocks: Kp 5 is a G1 storm, Kp 6 G2, Kp 7 G3, Kp 8 G4 and Kp 9 G5. Flares are classed A, B, C, M and X by peak X-ray brightness, each class ten times the one before; M1 flares cause R1 blackouts and X1 flares R3.

Space weather for nearby cities

• Space weather Arlington, VA
• Space weather Washington
• Space weather Springfield, VA
• Space weather Saint Charles, MD
• Space weather St. Charles
• Space weather Potomac
• Space weather Manassas
• Space weather Columbia, MD

More sky pages

• Space weather today (worldwide)
• Northern lights tonight in Alexandria, VA
• Aurora forecast
• Meteor showers

Guides

• Solar Flares and Geomagnetic Storms Explained: R, S and G Scales
• What Kp Index Do You Need to See the Northern Lights?
• How to See the Northern Lights Tonight: A Practical Guide
• GPS Jamming and Spoofing Explained: How Maps Detect It