This covers Cathays, all of Grangetown and Riverside, much of Canton, Atlantic Wharf, Pontcanna and Adamsdown.ДЄir blast radius (grey - 5psi): 1.72km. Dying takes between several hours and several weeks. Without medical treatment, expect between 50% and 90% mortality from acute effects alone. But it would also extend well into Riverside and Grangetown, covering Clare Road and Ninian Park Road. It would take out virtually the entire city centre, including Cardiff Castle, the Motorpoint Arena and Cardiff Crown Court. Heavily built concrete buildings would be demolished.

That includes Fitzhammon Embankment, the Arms Park, Wood Street, Park Street and Westgate Street.ДЄir blast radius (red - 20psi): 0.76km. A nuclear fireball would take out the Principality Stadium, and everything directly around it. 'Fat Man' - the Nagasaki bomb (20 kilotons)ДЇireball radius (orange): 200 metres.

It would also cover Bristol and Bath, Taunton and Glastonbury. This would reach Swansea, Brecon and Abergavenny, as well as the entire South Wales Valleys. This would mean third degree burns 'throughout the layers of the skin', which could cause severe scarring, disablement and even amputation. Thermal radiation radius (lighter orange): 60km. Injuries are universal and fatalities widespread. That means houses would collapse in Cowbridge, Pontypridd, Newport and Blackwood. A lesser air blast radius would still cause the collapse of all residential buildings within a 20.7km radius. The fatality rate is still 100% or very close.ДЄir blast radius (grey - 5psi): 20.7km. Heavily built concrete buildings would be demolished in Wenvoe, St Fagans, Radyr, Pentyrch, Lisvane, Pontprennau and St Mellons. The fatality rate is 100%.ДЄir blast radius (red - 20psi): 8.91km. It would reach Dinas Powys in the south and Llanedeyrn and Llanishen in the north. This covers the entire city centre, all of the Bay, Canton, Cathays and Splott.ДЇireball radius (orange): A nuclear fireball would take out virtually all of Cardiff as well as much of Penarth. The Tsar Bomba - the largest USSR bomb tested (50 megatons) It would also reach Weston super Mare and Portishead. This radius covers Newport, all of the Vale of Glamorgan, most of the Rhondda, Bridgend, Cwmbran, Pontypool and Caerphilly. Thermal radiation radius (lighter orange): The thermal radiation radius is 29.1km. That means houses would collapse in Barry, Sully, Wenvoe, St Fagans, Tongwynlais, Pontprennau, St Mellons, Lisvane and Gwaelod y Garth. The fatality rate is still 100% or very close.ДЄir blast radius (grey - 5psi): A lesser air blast radius would still cause the collapse of all residential buildings within a 10km radius. Dying takes between several hours and several weeks.ДЄir blast radius (red - 20psi): The most intense air blast would have a radius of 4.75km and demolish heavily built concrete buildings in Penarth, Ely and Llanedeyrn. Radiation radius (green): Slightly wider than the fireball radius. Ivy Mike - the first H-bomb (10.4 megatons)ДЇireball radius (orange): The entire city centre and a whole lot more would be consumed by a nuclear fireball 3.2km wide, which would also consume Cardiff Bay, Canton, Splott, Cathays and Roath. We've used the Nukemap website and looked at three different bombs, all of which have been either used or tested. Here's what the effects could be today if a nuclear bomb detonated at the site of the Principality Stadium. In a report released in 2008 by the National Archives which dated from 1955, Cardiff was listed as one of the top targets for a Soviet atom bomb similar to the one dropped by the United States on Nagasaki at the end of World War Two. However, 60 years ago, crisis planners were desperately worried about the threat of a nuclear attack and identified key cities and towns in the UK which were a likely target to be wiped out with one nuclear bomb. It's a highly unlikely scenario, of course. The effects would be devastating (um, obviously) but this tool shows just how widespread they would be.Дepending on the size of the bomb, it's possible that more than 400,000 people would be killed and buildings flattened as far away as Barry.

What would happen if a nuclear bomb hit Cardiff?

Tsar bomba radius