Variable does not increment

I don't know why the variable clk_count does not increments, it's steel il the value 1. There is the code

LIBRARY IEEE;
USE IEEE.STD_LOGIC_1164.all;
Entity TestVar Is
Port (
        CLK      : in std_logic;
        RST      : in std_logic
      );
end TestVar;
ARCHITECTURE Arch OF TestVar Is
TYPE State_Type IS (Power_Up);
Signal pr_Stat, nx_Stat : State_Type;
Begin
 
PROCESS(CLK, RST)
BEGIN
  IF(RST = '1')THEN
      
      pr_Stat <= Power_Up;
  ELSIF(Clk'EVENT and Clk = '1') THEN
          pr_Stat <= nx_Stat;
          
  END IF;
END PROCESS;
PROCESS(pr_Stat)
    VARIABLE clk_count : INTEGER RANGE 0 TO 4194304 := 0;
BEGIN
    CASE pr_Stat IS
    
    When Power_Up =>
          IF(clk_count < 50) THEN
            clk_count := clk_count + 1;
            nx_Stat <= Power_Up;
             ELSE
                clk_count := 0;
          END IF;
            
    When OTHERS => NULL;
      END CASE;
END PROCESS;
END Arch;