(AGI) Rome, July 18 - Soaring weekend temperatures triggeredpre-emptive health alerts on Friday for several cities innorth-central Italy. With Saturday and Sunday's temperaturesexpected to top 35 degrees Celsius, health officials placedBolzano and Perugia on "red alert". Cities further south,including Bologna, Firenze, Pescara, Trieste, Venice and Veronawere placed on "orange alert". (AGI) . .