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Subject Athens under water after several hours of rainfall!!! Italy too!!! More to come!!!

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Storm Forecast
Valid: Sun 24 Feb 2013 06:00 to Mon 25 Feb 2013 06:00 UTC
Issued: Sun 24 Feb 2013 03:27
Forecaster: VAN DER VELDE
A level 1 was issued for southern Bosnia-Herzegovina, Montenegro, Albania, western and northern Greece for excessive convective rainfall, severe convective wind gusts, tornadoes and large hail.

SYNOPSIS

A large low pressure area is centered over the Gulf of Genua. Its cyclonic pressure pattern extends from southern Scandinavia, UK, Iberian Peninsula to the Balkan. Most of this area is inside the cold airmass at the surface. Warm airmass is found near southern Italy and Balkan, aloft even deeper northwards into central Europe, with associated cloudiness and precipitation. The warm airmass is conditionally unstable from Tunesia to the southern Balkan with MLCAPE over 500 J/kg, but seems mostly capped over most parts of the Ionean Sea except near the Balkan coast. Significant winds are present in this region as well with more than 25 m/s in the lowest 3 kilometers.

DISCUSSION

... southern Bosnia-Herzegovina, Montenegro, Albania, western and northern Greece...

Storm-relative helicity is enhanced to values over 250 m²/s² as result of veering wind profiles associated with warm air advection. With reasonable CAPE this will likely result in development of some supercells, with large hail and possibly tornadoes (regarding low-level shear >15 m/s and low LCL height). More general threat comes from storms sticking over elevated terrain especially in the Montenegro region, which can result in tens of millimeters of rainfall in few hours time with local flash floods as result. The precipitable water content is not so high for an obvious level 2, and strong storm-relative upper winds should carry precipitation away from cores, spreading it over larger regions further inland, which should also gather increased rainfall rates from the moist upslope flow. Additionally, severe wind gusts can occur, especially when an MCS would organize into linear segments, or in association with supercells.

http://www.estofex.org/
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Original Message The floods caused chaos in Athens on Friday morning
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Several hours of heavy rain and a thunderstorm in the Greek capital Athens have flooded roads and homes, caused traffic jams and disrupted the train and tram network, officials say.

The deluge inundated basements and forced authorities to close underpasses and a central subway station.

The fire department said it had received at least 600 calls to drain water from houses and businesses.

Many of the city's streets remain ankle-deep in water.

"It was one of the worst thunderstorms we have ever had in the greater Athens area [since 1961]," fire department chief Sotiris Georgakopoulos told NET state television.

At one point the rainfall was so intense that parked cars were swept away by racing waters.

"There are cars immobilised on several Athens highways and we have dispatched tow trucks to clear the roads," senior traffic police officer Dimitris Papanagiotou told NET.

Fire chiefs say that they have about 60 crews tackling the floods which they expect to recede throughout Friday.

No injuries have been reported.
[link to www.bbc.co.uk]

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