Mesoscale Discussion
Valid: Mon 21 Sep 2015 08:00 to Mon 21 Sep 2015 14:00 UTC
Issued: Mon 21 Sep 2015 07:46
Forecaster: DAFIS

Serious flash floods are reported since the early morning hours of Monday in South Greece. CRR Instantaneous Precipitation Classes from SEVIRI satellite show convective rain rates of more than 50mm/h moving towards Attica, Athens where a nasty flash flood is forecast the next 3 hours. The local radars show reflectivity signatures of 60 dBz within this MCS that slowly moves E - NE. The following 6 hours, a quasi-stationary front will form in Central Greece where sustain influx of very unstable air masses from the Aegean Sea (SST >28°C) will result in more flash floods and hail.

DLS according high resolution models exceeds the 20m/s locally and SREH 0-3km has values up to 350m²/s². The last soundings from nearest stations at 00z show also a mid level dry intrusion, so severe wind gusts are also forecast.