First published Oct 20, 2026, 4:30:15 AM UTC · Last updated Oct 20, 2026, 4:30:15 AM UTC

Thunderstorms and lightning

Thunderstorms and Heavy Rain Forecast in Sumatera Utara

Reported by Indonesia BMKG Weather Alerts

Thunderstorms and heavy rainfall are forecast in parts of Sumatera Utara from 20 October 2026 at 10:15 WIB, with conditions expected to improve by 13:15 WIB. Reduced visibility, strong winds, and localized flooding are listed as possible effects.

At a glance

Affected location: Sumatera Utara

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Why it matters

The public is advised to remain vigilant, limit outdoor activities, and take precautions during the forecast period.

Location

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Generated scores

Scores are based on the cited reporting and use a 1–10 scale. Read the methodology.

Confidence: 6/10How certain the assessment is based on the clarity and evidence in the cited reporting.
Geographic reach: 3/10How widely the event reaches, from a local area (1) to worldwide impact (10).
Global importance: 2/10The event's broader significance, from limited importance (1) to major global importance (10).
Impact magnitude: 3/10The scale or severity of the real-world impact, from minor (1) to extreme (10).
Urgency: 7/10How time-sensitive the event is, from low urgency (1) to immediate attention needed (10).

Primary official sources

Indonesia BMKG Weather Alerts Thunderstorm This Morning in Sumatera UtaraBMKG — Indonesian Agency for Meteorology, Climatology, and Geophysics

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Related developments reported in the last 30 days. These are not necessarily ongoing incidents.

Nearby · within 200 km
Thunderstorm This Morning in Sumatera UtaraOct 20, 2026, 3:05 AM UTC
Thunderstorms and heavy rainfall were forecast in parts of North Sumatra from 10:15 to 13:15 WIB on 20 October 2026, with possible reduced visibility, strong winds, and localized flooding.
Nearby · within 200 km
Thunderstorm This Morning in Sumatera UtaraOct 19, 2026, 9:45 PM UTC
Thunderstorms and heavy rainfall are forecast from 05:10 to 08:10 WIB on 20 October 2026 in parts of Sumatera Utara, including 17 named localities. The source warns of possible reduced visibility, strong winds, and localized flooding.
Nearby · within 200 km
Thunderstorm Tonight in Sumatera UtaraOct 18, 2026, 9:00 PM UTC
2 reports describing the same event are grouped here. Expand the group to review every source report.
Nearby · within 200 km
Thunderstorm This Morning in Sumatera UtaraOct 17, 2026, 9:30 PM UTC
Thunderstorms and heavy rainfall are forecast from 05:00 to 08:00 WIB on 18 October 2026 in parts of Sumatera Utara. The forecast warns of possible reduced visibility, strong winds, and localized flooding, and advises vigilance and limiting outdoor activities.
Nearby · within 200 km
Thunderstorm Tonight in Sumatera UtaraOct 17, 2026, 4:00 PM UTC
2 reports describing the same event are grouped here. Expand the group to review every source report.
Nearby · within 200 km
Thunderstorm This Evening in Sumatera UtaraOct 16, 2026, 9:40 AM UTC
Thunderstorms and heavy rain are forecast in parts of Sumatera Utara, Indonesia, from 16 October 2026 at 16:50 WIB, with conditions expected to improve by 19:50 WIB. The source warns of reduced visibility, strong winds, and localized flooding.

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