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Severe weather can occur under a variety of situations, but three characteristics are generally needed: a temperature or moisture boundary, moisture, and (in the event of severe, precipitation-based events) instability in the atmosphere.
Severe is defined as hail 1 to 2 inches (25 to 51 mm) diameter, winds 58 to 75 miles per hour (93 to 121 km/h), or a tornado. [11] Significant severe is defined as hail 2 inches (51 mm) in diameter or larger, winds 75 mph (65 knots, 120 km/h) or more, or a tornado of strength EF2 or stronger. [1] [12]
Any thunderstorm which produces hail that reaches the ground is known as a hailstorm. [5] An ice crystal with a diameter of >5 mm (0.20 in) is considered a hailstone . [ 4 ] Hailstones can grow to 15 cm (6 in) and weigh more than 0.5 kg (1.1 lb).
Severe storms bringing hail, strong winds and even tornadoes are possible in central North Carolina on Friday as a cold front moves through the state., forecasters say.
Quarter-sized hail piled up several inches deep and stripped leaves from the trees, changing the landscape into what looked like a winter wonderland. A hai Summer turns to winter: Hailstorm drops ...
Hard freeze warning NPW – Minimum shelter temperatures are forecast to be 28 °F (−2 °C) or below over a widespread area during the growing season. A hard freeze may occur with or without frost. A hard freeze may occur with or without frost.
Cumulonimbus are a notable hazard to aviation due most importantly to potent wind currents but also reduced visibility and lightning, as well as icing and hail if flying inside the cloud. Within and in the vicinity of thunderstorms there is significant turbulence and clear-air turbulence (particularly downwind ), respectively.
The National Weather Service in Topeka said quarter-size hail and wind gusts up to 60 mph (96 kph) were expected across northern Kansas overnight until 6 a.m. on Thursda Storm carrying massive ...