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Mesoscale convective systems are thunderstorm regions which may be round or linear in shape, on the order of 100 kilometres (62 mi) or more across in one direction but smaller than extratropical cyclones, [2] and include systems such as tropical cyclones, squall lines, and mesoscale convective complexes (MCCs), among others.
In Canada, a severe thunderstorm is defined as having wind gusts of greater than 90 km/h (56 mph), hail with a diameter of greater than two centimetres (0.79 in), rainfall rates of greater than 50 millimetres (2.0 in) in one hour or greater than 75 millimetres (3.0 in) in three hours, or tornadoes. [14]
On July 29, 2009, a record breaking 333 millimetres (13.1 in) of rain was recorded in Dhaka, in 24 hours, previously 326 millimetres (12.8 in) of rain was recorded on July 13, 1956. [ 11 ] On September 27, 2020, record breaking 433 millimetres (17.0 in) of rain fell just in 12 hours in the city of Rangpur in Northern Bangladesh , producing ...
Multi-bow – Multiple bow derechos are embedded in a large squall line typically around 400 km (250 miles) long. One example of a multi-bow serial derecho is a derecho that occurred during the 1993 Storm of the Century in Florida. [15] Because of embedded supercells, tornadoes can spin out of these types of derechos. This is a much more common ...
Severe weather and tornadoes can develop in an area of low CAPE values. The surprise severe weather event that occurred in Illinois and Indiana on April 20, 2004, is a good example. Importantly in that case, was that although overall CAPE was weak, there was strong CAPE in the lowest levels of the troposphere which enabled an outbreak of ...
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.
"At 8:03 p.m., severe thunderstorms were located along a line extending from near Newport to near Poolville, moving east at 25 mph," says the NWS. "Hail damage to vehicles is expected. Expect wind ...
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.