ST MARTINS, ST MARTINS - SEPTEMBER 02: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge wave as they head back to the Royal helicopter after visiting the Island of St Martin's in the Scilly Isles on September 2, 2016 in St Martins, England. The Duke and Duches's visit to the Scilly Isles was delayed this morning due to bad weather. (Photo by Chris Jackson - WPA Pool/Getty Images)

ST MARTINS, ST MARTINS - SEPTEMBER 02: Catherine, Duchess of Cambridge visits the Island of St Martin's in the Scilly Isles on September 2, 2016 in St Martins, England. The Duke and Duches's visit to the Scilly Isles was delayed this morning due to bad weather. (Photo by Chris Jackson - WPA Pool/Getty Images)

ST MARTINS, ST MARTINS - SEPTEMBER 02: Catherine, Duchess of Cambridge visits the Island of St Martin's in the Scilly Isles on September 2, 2016 in St Martins, England. The Duke and Duches's visit to the Scilly Isles was delayed this morning due to bad weather. (Photo by Chris Jackson - WPA Pool/Getty Images)

ST MARTINS, ST MARTINS - SEPTEMBER 02: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge visit the Island of St Martin's in the Scilly Isles on September 2, 2016 in St Martins, England. The Duke and Duches's visit to the Scilly Isles was delayed this morning due to bad weather. (Photo by Chris Jackson - WPA Pool/Getty Images)

ST MARTINS, ST MARTINS - SEPTEMBER 02: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge visit the Island of St Martin's in the Scilly Isles on September 2, 2016 in St Martins, England. The Duke and Duches's visit to the Scilly Isles was delayed this morning due to bad weather. (Photo by Chris Jackson - WPA Pool/Getty Images)

ST MARTINS, ST MARTINS - SEPTEMBER 02: Catherine, Duchess of Cambridge visits the Island of St Martin's in the Scilly Isles on September 2, 2016 in St Martins, England. The Duke and Duches's visit to the Scilly Isles was delayed this morning due to bad weather. (Photo by Chris Jackson - WPA Pool/Getty Images)

This US Air Force handout photo released September 2, 2016 shows an empty aircraft ramp at Tyndall Air Force Base, Florida on September 1, 2016. Tyndall AFB sheltered all aircraft in preparation for Tropical Storm Hermine, one of the only times there have been no F-22 Raptors on the ramp since their arrival. US weather officials warned Tropical Storm Hermine posed "life-threatening" danger on Friday despite weakening as it moves across Florida and up the East Coast. / AFP PHOTO / US AIR FORCE / Airman 1st Class Cody R.MILLER / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / US AIR FORCE/Airman 1st Class Cody R. MILLER" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS AIRMAN 1ST CLASS CODY R.MILLER/AFP/Getty Images

This NASA-NOAA GOES East satellite phototaken at 1137 UTC on September 2, 2016 shows Tropical Storm Hermine. US weather officials warned Tropical Storm Hermine posed "life-threatening" danger on Friday despite weakening as it moves across Florida and up the East Coast. Downgraded from hurricane status after hitting Florida's Gulf coast earlier on Friday, the storm's center was around 50 miles (80 kilometers) northeast of Florida's capital Tallahassee, passing into Georgia at 0900 GMT, the Miami-based National Hurricane Center (NHC) said. / AFP PHOTO / NASA-NOAA GOES Project / HO / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / NASA-NOAA GOES PROJECT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS HO/AFP/Getty Images