Article | REF: P4225 V1

Early alert systems for sudden flooding

Author: Pierre-Antoine VERSINI

Publication date: March 10, 2012

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2. Weather observations and forecasts

This section looks at the various meteorological observation and forecasting tools, and more particularly those dedicated to precipitation, a major factor in the genesis of flash floods. In meteorology, we distinguish between different spatial scales: the synoptic scale (several hundred kilometers), which focuses on general atmospheric circulation; the mesoscale (between several kilometers and several hundred kilometers), from which we can track thunderstorms and convective complexes; and the microscale, that of clouds (a few kilometers and below). Observation and forecasting of flash floods tend to fall into the latter two categories.

2.1 Precipitation measurement tools

Observing an intense rainfall episode such as a flash flood is highly complex, since such...

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