The now Category 4 Hurricane Humberto is currently tracking northeastwards from the southeast coast of America towards Ireland at around 130km/h, but is expected to slow significantly before reaching our shores. However, weather models say it will become re-energised by the jet stream - a fast-flowing current of air above the North Atlantic - which will bring stormy conditions from Friday morning until late evening.
The National Weather Service warns that a dangerous heat wave, combined with high humidity, will blanket much of the central and eastern US, with temperatures possible above 100°F.