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Automated Alert Predicts High-Severity Rainfall for Chennai on September 19

September 18, 2026 · wweather1 editorial · 1 min read

An automatic forecast alert has been issued for Chennai, India, where 30.4 mm of rainfall is expected on September 19, 2026. This forecasted precipitation crosses the local threshold of 30 mm, triggering a high-severity warning.

According to automated forecast data from wweather1.com, Chennai is expected to experience a significant rain event starting on September 19, 2026, at 00:00 UTC. The severity of the incoming weather has been classified as high based on the projected precipitation volume.

An automatic alert was generated because the forecasted rainfall of 30.4 mm crossed the predefined monitoring threshold of 30 mm. This system alert relies on the proprietary forecasting metrics of wweather1.com.

Residents in the affected areas are advised to monitor the situation as the forecast date approaches. This alert is automatically generated based on the threshold crossing and is intended to provide early notification of the forecasted rain volume.

Why it is dangerous and what to do

⚠️ Safety
• Monitor local news and weather updates for changes in the forecast.
• Avoid traveling through heavily flooded streets and low-lying areas.
• Ensure outdoor drains and gutters are clear to help manage surface runoff.
📊 The numbers, from wweather1 data
Chennai: now +26°, Drizzle.
That is 1° above the September climate norm.
The record for this date is +39° (1952).
Three-day forecast: 18 September: +35°/+26° · 19 September: +34°/+25° · 20 September: +31°/+25°
The figures are computed automatically from the Open-Meteo/ERA5 archive — no eyeball estimates.

🌍 Weather in nearby cities

📰 Data source: wweather1. Forecast and analysis — wweather1, based on Open-Meteo / met.no data.

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