Effects radii for 1 kt blast (smallest to largest):
Fireball radius: 0.03 km / 0.02 mi (2,884.84 m² / 31,052.18 ft²) Maximum size of the nuclear fireball; relevance to lived effects depends on height of detonation.
Air blast radius: 0.28 km / 0.17 mi (0.25 km² / 0.1 mi²) 20 psi overpressure; heavily built concrete buildings are severely damaged or demolished; fatalities approach 100%.
Thermal radiation radius: 0.69 km / 0.43 mi (1.48 km² / 0.57 mi²) Third-degree burns to all exposed skin; starts fires in flammable materials, contributes to firestorm if large enough.
Air blast radius: 0.74 km / 0.46 mi (1.72 km² / 0.66 mi²) 4.6 psi overpressure; most buildings collapse; injuries universal, fatalities widespread.
Davy Davy Crockett, king of the mini nukes.
Seismograph 350miles away in Amarillo charted an 8.7 earthquake at the time of the blast. Prayers for all in my favorite town between Dallas and Austin.