While some thunderstorms can be seen as they approach, others are not visible. Recognizing the warning signs can help .
THUNDERSTORM WATCH - When conditions are such that winds reach or exceed 58 miles per hour or hail three-fourths of an inch in diameter are likely to occur.
THUNDERSTORM WARNING - A severe thunderstorm meeting the "thunderstorm watch" conditions has been sighted or observed on radar.
Warning signs of thunderstorm conditions:
Dark towering or threatening clouds
Distant lightning and thunder.
One one-thousand, two one-thousand, KABOOM!! By counting the seconds between the flash and the thunder and dividing by five, you can estimate your distance from the strike (in miles).