I've just stumbled across a site that has a suprisingly detailed and morbid "Nuke simulator'
nuclearsecrecy.com/nukemap/While this may or may not be actually accurate, it's the closest source we have.
Using the following data.
50 Kilograms.
650 (Rough average for effective airburst, not quite as precise as a proper ICBM, but then again, it's a balloon)
4.4 Km/H Windspeed (Based on Hajj 2015)
For that, here's a few screenshots of the impact on Mecca.
Image 1: Major Humantarian areas destroyed White dots are Religious centers, Red ones are hospitals, orange ones are Fire Stations
Image 2: Overpressure Damage
Within the smallest area(Dark Red), the PSI is 200 or above, basically nothing is left.
The next largest (Bright Red), the PSI is 20 or above, nearly every building is destroyed.
The Largest (Grey with black borders) Residential buildings collapse, death is likely but not guranteed.
Image 3: Thermal Radiation area
In essence, outside the largest circle, most things are safe from imediate damage. Inside it, no gurantees, the next circle is high likelyhood of 1rst degree burns(Yes it's a nuke, but that's a really long F***ing distance away) The next circles represent 2nd, then third, in that order. In the middle, there's the overpressure waves for scale.http://i.imgur.com/gRoWvjW.jpg
Image 4: Radiation
The green pinpoint there is the "You will probably die from imediate radiation alone" AKA Neutron Bomb radius.
The orange circle is the largest circle from the last image for scale
The Big "Tail" is the radiation as it's blown by the wind, assuming the wind stays in one direction. If it doesn't, well use your imagination.
According to the sim, the fireball will be 580m across, and the crater 280.