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HomeWeather news → Jacksonville Forecast Exceeds Rainfall Threshold with 47.7 mm Projected
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Jacksonville Forecast Exceeds Rainfall Threshold with 47.7 mm Projected

September 20, 2026 · wweather1 editorial · 1 min read

An automatic forecast alert from wweather1.com has indicated that Jacksonville, US, is expected to experience heavy rainfall of 47.7 mm on September 20, 2026. This projected precipitation level exceeds the established high-severity threshold of 30 mm.

According to the automatic forecast data from wweather1.com, a high-severity rain event is expected to begin in Jacksonville, United States, on September 20, 2026. The forecasted precipitation value of 47.7 mm has prompted the automated system to issue an alert.

This alert was triggered because the projected rainfall of 47.7 mm crossed the defined safety and monitoring threshold of 30 mm. The system automatically monitors these metrics to identify significant weather shifts and potential environmental impacts.

Local residents should remain aware of the weather conditions as the forecast model indicates a sustained period of rain. This event is classified as high severity based solely on the automatic crossing of the meteorological threshold.

Why it is dangerous and what to do

⚠️ Safety
• Avoid traveling through heavily flooded areas or standing water.
• Ensure outdoor drainage systems and gutters are clear of blockages.
• Monitor local weather updates for changes in the forecast.
• Secure any loose outdoor items that could be affected by heavy rainfall.
📊 The numbers, from wweather1 data
Jacksonville: now +24°, Partly cloudy.
That is 3° above the September climate norm.
The record for this date is +36° (1942).
Three-day forecast: 20 September: +32°/+24° · 21 September: +29°/+23° · 22 September: +36°/+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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