Magnetic storms in San Francisco

Magnetic storm in San Francisco today: planetary Kp = 0.0 (G0). Over the last 7 days the maximum Kp above San Francisco reached 5.7 (G1); storm days (G1+) this week: 3.

San Francisco sits at geomagnetic latitude 43.4°. The nearest magnetic observatory continuously recording the field is Paratunka (Kamchatka), 6088 km away. Population 827,526.

Magnetic storms and health of San Francisco residents: at Kp ≥ 5 weather-sensitive people may experience pressure swings, headaches, sleep issues. Especially pensioners and people with hypertension should watch the forecast. During a storm — hydrate more, avoid alcohol and strong coffee, avoid intense physical load.

Technical consequences for San Francisco at G3+: GPS, HF radio and precise positioning systems may glitch. Drivers on long routes should watch the forecast for the next 24–72 hours. Data source: NOAA Space Weather Prediction Center, refreshed every 10 minutes.

Over San Francisco during the last 24 hours. Kp reached a maximum of 2.7 around 17:00 local time and dipped to 1.0. The planetary trend over the past 6 hours is steady — no sharp changes near San Francisco right now. So far this month the planet has logged 3 days with a G1 or stronger geomagnetic storm.

Aurora visibility threshold for San Francisco. At a geomagnetic latitude of 43.4°, the minimum Kp giving a realistic chance of visible auroras above San Francisco is about Kp ≥ 8. The current equatorial Dst index is 0 nT — the magnetosphere is in a quiet phase. Dst complements Kp by showing how long and how deep a storm's main phase has been — useful context when checking whether auroras are likely tonight.

Weather and atmospheric pressure in San Francisco right now. Temperature +10.8°C, atmospheric pressure 759.5 mm Hg (1012.6 hPa), cloud cover 100%, humidity 92%, wind 13.6 km/h. During G1+ geomagnetic storms, swings in atmospheric pressure tend to amplify symptoms for weather-sensitive people: those with hypertension often notice blood-pressure spikes, and readings below 1000 hPa combined with Kp ≥ 5 frequently bring headaches and fatigue. That is why the San Francisco page shows both indicators side by side. Weather data from Open-Meteo (CC BY).

Aurora viewing window for San Francisco tonight. Sunset is at 09:53 local time, sunrise tomorrow at 20:21. Moon phase — first quarter with 48% disk illumination. Heavy cloud cover lowers the chance of seeing auroras even during a strong storm — it may be worth waiting for the next clear night..