Folic acid can hide the symptoms of an underlying vitamin B12 deficiency, which can cause permanent damage to the nervous system. Taking any one of the B vitamins for a long period of time can result in an imbalance of other important B vitamins.olic acid can hide the symptoms of an underlying vitamin B12 deficiency, which can cause permanent damage to the nervous system. Taking any one of the B vitamins for a long period of time can result in an imbalance of other important B vitamins.
Tornadoes can occur at any time of the year. In the southern states, peak tornado occurrence is in March through May, while peak months in the northern states are during the summer. In some states, a secondary tornado season occurs in the fall. Tornadoes are most likely to occur between 3 and 9 p.m. but have been known to occur at all hours of the day or night. The average tornado moves from southwest to northeast, but tornadoes have been known to move in any direction. The average forward speed is 30 mph but may vary from nearly stationary to 70 mph.
Tornadoes form in unusually violent thunderstorms when there is sufficient (1) instability and (2) wind shear present in the lower atmosphere. Instability refers to unusually warm and humid conditions in the lower atmosphere, and possibly cooler than usual conditions in the upper atmosphere. Wind shear in this case refers to the wind direction changing, and the wind speed increasing, with height.