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Southern Portugal, Spain
Ahead of the slowly propagating cut-off low, a southerly flow leads to strong WAA over south-western Iberian Peninsula. Latest models agree that steep mid-level lapse rates originating from the Atlas mountains will spread across southern Iberian Peninsula during the period. At lower level, easterly surface winds are forecast that will advect rich boundary-layer moisture from the Mediterranean Sea into southern, and south-western Iberian Peninsula. Expect daytime heating will likely create rather high instability. In the afternoon hours, quite strong upper level southerly jet streak is forecast to enter southern Spain, and increasing QG forcing is forecast at its cyclonic flank. Thunderstorms will likely fire up in the afternoon and will rapidly evolve into organized cells including supercells. Very large hail and severe wind gusts are forecast, as well as tornadoes given locally high low-level buoyancy. Main threat of tornadoes exist over southern Portugal region in the evening hours, as models indicate increasing winds at the 700 hPa level and 0-3 km vertical wind shear. Given persistent forcing, convection will likely merge into one or two MCS that will be capable of producing high precipitation and local flash flooding during the night hours.
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