War Caster feat: Booming Blade as a reaction t…

War Caster feat: Booming Blade as a reaction to enemy provoking at 5′ -> 10′, is a reach weapon valid for the melee weapon attack?

@JeremyECrawfordReally hoping for official answer. If a character with War Caster feat casts Booming Blade as a reaction to enemy provoking at 5’ -> 10’, is a reach weapon valid for the melee weapon attack component of the spell?