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APPLICATIONS OFMETEOSAT SECOND GENERATION (MSG)

Flooding

Author: Pirkko Pylkkö (Finnish Meteorological Institute)Author: Pirkko Pylkkö (Finnish Meteorological Institute)pirkko.pylkko@fmi.fi

Jochen Kerkmann (EUMETSAT)Jochen Kerkmann (EUMETSAT)jochen.kerkmann@eumetsat.int

Sep 2005Sep 2005

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Flood detection and monitoringBackground

•Rapidly updated satellite rainfall estimations at the geostationary scale – one of the tools to estimate floods• Benefits are more precise mesoscale and global scale weather forecasts, better monitoring of for instance flash floods, storm-scale events (See also Satmanu Manual, http://www.knmi.nl/satrep SatRep Manual, Case Studies, Catastrophic cases, 06-13 Aug 2002 Flooding over central Europe)

BUT• MSG SEVIRI channels can also be used to monitor the extent of floods• Channels 1-3 (0.6, 0.8 and 1.6µm) and the HRV are the basic channels for flood detection • Vegetation index (channels 0.6 and 0.8 µm) of AVHRR like instruments has been used traditionally for flood detection.• SEVIRI offers some additional tools for floods – examples on following pages

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ExampleFlooded rice fields in Italy 24th Apr 2003

Situation before: only MET-7 VIS available

- Some indication of flood can be seen South of Alps northeast of Italy

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ExampleFlooded rice fields in Italy 24th Apr 2003

• SEVIRI 0.6µm channel 09:00 UTC

• Nothing much to be seen alone

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ExampleFlooded rice fields in Italy 24th Apr 2003

• SEVIRI 0.8 µm channel 09:00 UTC

• Flooded area can be seen pretty well

• This channel is reflecting vegetation very well and water is black

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ExampleFlooded rice fields in Italy 24th Apr 2003

• SEVIRI 1.6 µm channel 09:00 UTC

• Flooding area visible even better than with 0.8

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ExampleFlooded rice fields in Italy 24th Apr 2003

• SEVIRI rgb combination of 1.6, 0.8 and 0.6µm channels 09:00 UTC

• Flooded area quite distinct, but the resolution – is there anything to correct that?

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ExampleFlooded rice fields in Italy 24th Apr 2003

• SEVIRI HRV channel 11:00 UTC

• The resolution is now much better

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ExampleFlooded rice fields in Italy 24th Apr 2003

• SEVIRI 1.6 combined twice with HRV channel 11:00 UTC

• This is giving the best resolution and detection

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ExampleFloods in Angola and Zambia

3rd Feb 2004

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ExampleFloods in Angola and Zambia

3rd Feb 2004 11:30

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ExampleFloods in Angola and Zambia

3rd Feb 2004 11:30

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ExampleFloods in Angola and Zambia

3rd Feb 2004 11:30

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ExampleFloods in Romania26th Jul 2005 12:00

Meteosat8 HRV channel right

AVHRR below left

Red circle shows flooded area