The last week of March, the first week of April turned out to be active on various weather hazards associated with convection. During the reporting period from 21 March to 6 April 2017, the US National Meteorological Service recorded about 2,500 reports of adverse weather conditions, including 153 tornadoes.
In a relatively short period, four flashes of the tornado occurred at once, the most fruitful of which happened on April 2-3 in the southeastern states (47 tornadoes). It is noteworthy that for this period of time there was not a single tornado category EF3 and higher, although the American Center for Storm Prediction twice gave a rare highest risk of danger due to the high probability of significant and long-lived tornadoes.
Several events with a large hail occurred in the state of Texas. On March 26th, in a suburb of Dallas-Denton, a hail of up to 11 cm in diameter was recorded. Six days later, on the first of April, truly giant hailstones to 12-13 cm fell out near the town of Coleman. In total, the National Meteorological Service of the USA for the period from March 21 to April 6 revealed 74 reports of a significant city. According to the criteria of American meteorologists, a hail in diameter greater than 5 cm is considered significant.
More than 50% of reports of hazardous weather conditions were associated with convective winds. In the town of Altoona, Kansas, on April 4, convective gusts of wind up to 37 m / s were recorded!
Unfortunately, there were human losses. At least 7 people were killed and 18 injured in the US as a result of a protracted outbreak of dangerous convective weather phenomena.
