Squally thunderstorms embedded in a strong westerly flow are expected to affect the lower North Island this afternoon and evening. Squally winds of 90 to 110 km/h are expected with these thunderstorms, and there is a moderate risk of SEVERE THUNDERSTORMS from the Kapiti Coast to Whanganui, including Manawatu, producing damaging winds with gusts greater than 110 km/h. Wind gusts of this strength can cause some structural damage, including trees and power lines, and may make driving hazardous.