A turbine blade (200, 700, 800), comprising: an airfoil (206, 706, 806) that extends from a platform to a tip, and from a leading edge to a trailing edge, the airfoil having a pressure side (218, 818) and an opposite suction side, the tip having a tip region (247, 826) that extends from the leading edge toward the trailing edge, the tip region bounded by a top cavity wall (312, 736) that extends from the suction side to the pressure side at a positive angle (α) that is defined between the top cavity wall (312,736) and a horizontal reference line extending from an inner surface (220.1) of the suction side to an inner surface (218.1, 818.1) of the pressure side (218, 818), with a tip flag channel (248, 828) defined by at least the pressure side, the suction side and the top cavity wall (312,736), the leading edge having a leading edge cooling circuit that is defined from the platform to the tip flag channel, the leading edge cooling circuit in fluid communication with the tip flag channel to direct cooling fluid received from the platform radially into the tip flag channel, and the pressure side includes at least one tip dust hole (324, 738, 838) defined through the top cavity wall (312,736) proximate the pressure side, the at least one tip dust hole having an inlet (350, 740, 840) in fluid communication with the tip flag channel and an outlet (352, 744, 844) in fluid communication with a fluid surrounding the tip of the airfoil to direct particles in the cooling fluid out of the airfoil; and at least one rib defined on the top cavity wall (312,736) that extends from the suction side to the pressure side at a second angle (α3), with the second angle (α3) defined between the horizontal reference line and a first side of the at least one rib, the at least one rib merges with at least one flow scoop to direct the particles and a portion of the cooling fluid into the inlet (350, 740, 840) of the at least one tip dust hole (324, 738, 838) and at least one flow scoop is defined on the pressure side about a portion of a perimeter of the inlet (350, 740, 840) of the at least one tip dust hole (324, 738, 838) and extends outwardly into the tip flag channel (248,828). an airfoil (206, 706, 806) that extends from a platform to a tip, and from a leading edge to a trailing edge, the airfoil having a pressure side (218, 818) and an opposite suction side, the tip having a tip region (247, 826) that extends from the leading edge toward the trailing edge, the tip region bounded by a top cavity wall (312, 736) that extends from the suction side to the pressure side at a positive angle (α) that is defined between the top cavity wall (312,736) and a horizontal reference line extending from an inner surface (220.1) of the suction side to an inner surface (218.1, 818.1) of the pressure side (218, 818), with a tip flag channel (248, 828) defined by at least the pressure side, the suction side and the top cavity wall (312,736), the leading edge having a leading edge cooling circuit that is defined from the platform to the tip flag channel, the leading edge cooling circuit in fluid communication with the tip flag channel to direct cooling fluid received from the platform radially into the tip flag channel, and the pressure side includes at least one tip dust hole (324, 738, 838) defined through the top cavity wall (312,736) proximate the pressure side, the at least one tip dust hole having an inlet (350, 740, 840) in fluid communication with the tip flag channel and an outlet (352, 744, 844) in fluid communication with a fluid surrounding the tip of the airfoil to direct particles in the cooling fluid out of the airfoil; and at least one rib defined on the top cavity wall (312,736) that extends from the suction side to the pressure side at a second angle (α3), with the second angle (α3) defined between the horizontal reference line and a first side of the at least one rib, the at least one rib merges with at least one flow scoop to direct the particles and a portion of the cooling fluid into the inlet (350, 740, 840) of the at least one tip dust hole (324, 738, 838) and at least one flow scoop is defined on the pressure side about a portion of a perimeter of the inlet (350, 740, 840) of the at least one tip dust hole (324, 738, 838) and extends outwardly into the tip flag channel (248,828).