From webmd.Com:
prodromal symptoms
in the day or two before a migraine starts, you may experience prodromal symptoms such as fatigue, excessive yawning, food cravings (such as for chocolate), irritability, or restlessness.3
aura
some people experience an aura within 30 minutes before a migraine headache develops. Symptoms of an aura usually develop gradually over 5 to 20 minutes.3 during an aura, you may have visual disturbances such as wavy lines, flashes, sparks of light, blind spots, or distortions. You may also feel tingling or a "pins-and-needles" sensation in your hands, arms, or face.