USWW Aurora Watch — Aurora likely — G3+ watch active

Aurora Likely Tonight — G3 Watch Active for Delmarva

Why We're Watching

NOAA's Space Weather Prediction Center has a G3 (Strong) geomagnetic storm watch in effect, with strong storming flagged as the highest predicted level for both June 4 and June 5. A watch at this level typically means forecasters are tracking an incoming coronal mass ejection or a sustained high-speed solar wind stream capable of pushing the auroral oval well south of its usual position. For mid-Atlantic observers at roughly 38–39°N, a G3 watch is the threshold where Delmarva starts entering the conversation — not as a guarantee, but as a realistic chance worth preparing for.

That said, our confidence tonight is low. The watch is active, but the real-time solar wind data has not yet caught up to the forecast. We're in a wait-and-see posture: the ingredients are on the table, but they haven't combined yet.

Current Space Weather Conditions

• Kp now: 1.0 (very quiet — well below storm levels at this moment)
• Kp peak forecast (24h / 72h): not currently published in this cycle
• DSCOVR solar wind speed: 427 km/s (modest; storm-level enhancement typically begins above 500 km/s)
• DSCOVR Bz: +4.6 nT (northward — this orientation does NOT couple energy into Earth's magnetosphere; we need Bz to swing southward, negative, for storming to develop)
• DSCOVR density: 1.9 protons/cc (low)
• 60-minute Bz minimum: -0.1 nT (essentially neutral)
• 60-minute peak speed: 432 km/s
• OVATION auroral view-line latitude: not available this cycle
• OVATION probability for Delmarva (37–40°N): 0% at this snapshot

The disconnect is important: SWPC is watching for a G3, but the solar wind at L1 has not yet shown the southward Bz turn or the speed jump that would confirm the disturbance has arrived. If and when it does, conditions can change within an hour.

Delmarva Visibility Outlook

If the storm develops as forecast, aurora from Delmarva will be a northern-horizon-only event. We are too far south to ever see aurora overhead — that's a fact of geography, not forecasting. Face due north and look low, just above the tree line or the horizon line over open water.

Naked-eye visibility from our latitude usually requires sustained G3 or stronger conditions, dark skies, and a clear northern view. Even then, what the eye perceives is often a soft gray or pale green glow, sometimes with faint pillars or a subtle red wash high above the horizon — not the saturated curtains seen in higher-latitude photos.

Phone cameras are the realistic outcome for most Delmarva viewers. Modern night-mode phones, with their 3-to-10-second exposures, routinely pick up pinks, magentas, and greens that the human eye simply cannot register. If you go out and see nothing, point your phone north anyway and take a long exposure before calling it a bust.

Aurora visibility requires true astronomical darkness. Civil twilight ends in Salisbury at about 8:54 PM local; full darkness for aurora purposes comes roughly 60–90 minutes after sunset. The earliest realistic viewing window opens after about 9:30 PM local.

Best Viewing Locations

• Cape Henlopen State Park (DE) — dark northern view over the bay
• Assateague Island (MD/VA) — minimal light pollution, broad horizon
• Inland eastern-shore farmland — anywhere you can get north of the light dome of a town, with open fields facing north
• Avoid: Wilmington, Salisbury, Dover, and the Ocean City boardwalk. Any subtle aurora will be washed out by streetlights, signage, and sky glow.

Photographing the Aurora From Delmarva

If you want to give your phone or camera the best chance:

• Tripod or a steady surface — handheld will blur a long exposure
• Night mode on, 3–10 second exposure
• Manual mode (if available): ISO 1600–3200, shutter 5–10 seconds, aperture as wide as the lens allows
• Focus set to infinity (tap a distant light or star to lock focus)
• Frame low and north — include some foreground for scale
• Take multiple shots; conditions pulse and change minute to minute

What Could Make This Fizzle

This is a low-confidence forecast for a reason. Several things can knock it down before nightfall:

• Bz stays northward. Right now Bz is +4.6 nT. If it doesn't swing strongly southward (negative) when the disturbance arrives, very little energy will couple into the magnetosphere and the storm will underperform.
• Solar wind speed stays modest. We're at 427 km/s. Sustained G3 conditions typically need speeds well above 500 km/s.
• CME passes south of Earth or arrives glancing. A direct hit is needed for the forecast peak.
• SWPC downgrades the watch. If the disturbance arrives weaker than modeled, the G3 watch may be revised to G2 or G1, and Delmarva's viewing chances drop sharply.

We'll be watching DSCOVR's Bz and speed traces through the evening. A southward Bz turn paired with rising wind speed would be the green light.

Bottom Line

A G3 watch is active, which puts Delmarva in the conversation for a possible northern-horizon aurora tonight if the forecast holds. Real-time solar wind has not yet confirmed the disturbance, so confidence is low and a downgrade is entirely possible. If you want to try, head to a dark-sky spot with a clear northern view after about 9:30 PM local, face north, look low, and bring your phone — a long exposure is your best chance at catching color. No promises, just a reasonable shot worth taking if the sky is clear.

— US Weather Warriors Aurora Desk

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