Magnetic storms in Viljandi
Magnetic storms in Viljandi, Viljandimaa today. Current Kp index, 3-day forecast for Viljandi, local time, geomagnetic latitude and aurora visibility chance.
Data as of 24 Aug, 08:49 (Europe/Tallinn).
Weather in Viljandi
Weather data: Open-Meteo (CC BY).
Health and geomagnetic storms
A small library on how geomagnetic activity is associated with blood pressure, migraine, sleep, the cardiovascular system, anxiety and general wellbeing. Backed by peer-reviewed research, free of medical advice.
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Local context
Sensitivity · Viljandi
High sensitivity (sub-auroral zone)
Kp is a planetary index — the same globally. Local impact depends on geomagnetic latitude: the higher it is, the more noticeable the storm.
14-day calendar with Kp, moon and cloud factors
Seven quick questions and personal tips
Geomagnetic context for Viljandi
Magnetic storm in Viljandi: 3-day Kp chart
Aurora forecast in Viljandi
| Date | Max Kp | Moon | Clouds | Score | Outlook |
|---|---|---|---|---|---|
| Mon, Aug 24 | 1.7 | 82% | 97% | 0 | Auroras are very unlikely tonight. |
| Tue, Aug 25 | 1.7 | 90% | 79% | 1 | Auroras are very unlikely tonight. |
| Wed, Aug 26 | 1.7 | 95% | 60% | 1 | Auroras are very unlikely tonight. |
| Thu, Aug 27 | 1.7 | 99% | 33% | 2 | Auroras are very unlikely tonight. |
| Fri, Aug 28 | 3.0* | 100% | 78% | 0 | Auroras are very unlikely tonight. |
| Sat, Aug 29 | 3.0* | 99% | 99% | 0 | Auroras are very unlikely tonight. |
| Sun, Aug 30 | 3.0* | 96% | 91% | 0 | Auroras are very unlikely tonight. |
| Mon, Aug 31 | 3.0* | 91% | 65% | 1 | Auroras are very unlikely tonight. |
| Tue, Sep 01 | 3.0* | 84% | 93% | 0 | Auroras are very unlikely tonight. |
| Wed, Sep 02 | 3.0* | 75% | 51% | 1 | Auroras are very unlikely tonight. |
| Thu, Sep 03 | 3.0* | 65% | 37% | 2 | Auroras are very unlikely tonight. |
| Fri, Sep 04 | 3.0* | 55% | 84% | 1 | Auroras are very unlikely tonight. |
| Sat, Sep 05 | 3.0* | 44% | 33% | 3 | Auroras are very unlikely tonight. |
| Sun, Sep 06 | 3.0* | 34% | 53% | 2 | Auroras are very unlikely tonight. |
- Mon, Aug 240Max Kp: 1.7Moon: 82%Clouds: 97%Auroras are very unlikely tonight.
- Tue, Aug 251Max Kp: 1.7Moon: 90%Clouds: 79%Auroras are very unlikely tonight.
- Wed, Aug 261Max Kp: 1.7Moon: 95%Clouds: 60%Auroras are very unlikely tonight.
- Thu, Aug 272Max Kp: 1.7Moon: 99%Clouds: 33%Auroras are very unlikely tonight.
- Fri, Aug 280Max Kp: 3.0*Moon: 100%Clouds: 78%Auroras are very unlikely tonight.
- Sat, Aug 290Max Kp: 3.0*Moon: 99%Clouds: 99%Auroras are very unlikely tonight.
- Sun, Aug 300Max Kp: 3.0*Moon: 96%Clouds: 91%Auroras are very unlikely tonight.
- Mon, Aug 311Max Kp: 3.0*Moon: 91%Clouds: 65%Auroras are very unlikely tonight.
- Tue, Sep 010Max Kp: 3.0*Moon: 84%Clouds: 93%Auroras are very unlikely tonight.
- Wed, Sep 021Max Kp: 3.0*Moon: 75%Clouds: 51%Auroras are very unlikely tonight.
- Thu, Sep 032Max Kp: 3.0*Moon: 65%Clouds: 37%Auroras are very unlikely tonight.
- Fri, Sep 041Max Kp: 3.0*Moon: 55%Clouds: 84%Auroras are very unlikely tonight.
- Sat, Sep 053Max Kp: 3.0*Moon: 44%Clouds: 33%Auroras are very unlikely tonight.
- Sun, Sep 062Max Kp: 3.0*Moon: 34%Clouds: 53%Auroras are very unlikely tonight.
* Days marked with an asterisk do not have a direct NOAA forecast yet. If we have observations from 27 days ago, we use Bartels recurrence (the Sun rotates roughly every 27 days, so active regions often return with the same period). When no history is available, we substitute a baseline value typical for the current solar cycle 25 peak (Kp 3.0). Accuracy is lower than the direct three-day forecast.
How the score works
The composite score combines three signals: how strong the storm needs to be at your geomagnetic latitude, how bright the moon will be (a full moon hides faint auroras), and how cloudy the sky will be that night. A score of 70 or higher is excellent, 45 to 70 is good, below 20 means you probably will not see anything.
Magnetic storms in Viljandi over the last 30 days
Geomagnetic storms of class G1 and above recorded over the past month. Times are shown in the city's local timezone (GMT+3).
In Viljandi (geomagnetic latitude 55.9°), auroras are possible from Kp ≥ 6.
| Date | Peak | Max Kp | Level | Duration | Aurora visible |
|---|---|---|---|---|---|
| 06:00 | 5.0 | G1 | 3 h | No | |
| 21:00 | 5.3 | G1 | 3 h | No | |
| 06:00 | 5.0 | G1 | 3 h | No |
About magnetic storms in Viljandi
Magnetic storm in Viljandi today: planetary Kp = 1.7 (quiet). Over the last 7 days the maximum Kp above Viljandi reached 5.3 (G1); storm days (G1+) this week: 2.
Viljandi sits at geomagnetic latitude 55.9°. The nearest magnetic observatory continuously recording the field is Saint Petersburg (Voeikovo), 340 km away. Population 17,407.
Viljandi lies in the sub-auroral zone (55.9°), where storms are felt several times per year. At G3 and stronger, weather-sensitive residents may experience blood-pressure changes, headaches and sleep issues; pensioners and people with hypertension should watch the forecast. During a storm, drink more water, avoid alcohol and strong coffee, and reduce intense physical exertion.
Technical consequences for Viljandi (sub-auroral zone, 55.9°) appear from G4 upward: GPS and HF radio may degrade, precise positioning can drift, and northern power grids in the region carry a measurable GIC risk during the strongest events. Drivers on long routes should track the forecast for the next 24 to 72 hours. Source: NOAA Space Weather Prediction Center, updated every 10 minutes.
Over Viljandi during the last 24 hours. Kp reached a maximum of 2.3 around 03:00 local time and dipped to 0.7. The planetary trend over the past 6 hours is rising — conditions near Viljandi may intensify further. So far this month the planet has logged 2 days with a G1 or stronger geomagnetic storm.
Aurora visibility threshold for Viljandi. At a geomagnetic latitude of 55.9°, the minimum Kp giving a realistic chance of visible auroras above Viljandi is about Kp ≥ 5. 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 Viljandi right now. Temperature +13.3°C, atmospheric pressure 750.1 mm Hg (1000.1 hPa), cloud cover 100%, humidity 96%, wind 12.2 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 Viljandi page shows both indicators side by side. Weather data from Open-Meteo (CC BY).
Aurora viewing window for Viljandi tonight. Sunset is at 20:40 local time, sunrise tomorrow at 05:59. Moon phase — waxing gibbous with 84% 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..