![]() In addition, it has become apparent that the most damaging derechos are associated with particular types of mesoscale convective systems that are self-perpetuating (meaning that the convective systems are not strongly dependent on the larger-scale meteorological processes such as those associated with blizzard-producing winter storms and strong cold fronts). Various studies since the 1980s have shed light on the physical processes responsible for the production of widespread damaging winds by thunderstorms. However, derechos may occur at any time of the year, and can occur as frequently at night as during the day. A derecho-producing convective system may remain active for many hours and, occasionally, over multiple days.Ī warm-weather phenomenon, derechos occur mostly in summer, especially during June, July, and August in the Northern Hemisphere (or March, April, and May in the Southern Hemisphere), within areas of moderately strong instability and moderately strong vertical wind shear. Derechos move rapidly in the direction of movement of their associated storms, similar to an outflow boundary (gust front), except that the wind remains sustained for a greater period of time (often increasing in strength after onset), and may exceed hurricane-force. In many cases, convection-induced winds take on a bow echo (backward "C") form of squall line, often forming beneath an area of diverging upper tropospheric winds, and in a region of both rich low-level moisture and warm-air advection. ![]() ĭerechos can cause hurricane-force winds, tornadoes, heavy rains, and flash floods. This material may not be published, broadcast, rewritten or redistributed without permission.A shelf cloud along the leading edge of a derecho in MinnesotaĪ derecho ( / d ə ˈ r eɪ tʃ oʊ/, from Spanish: derecho, "straight" as in direction) is a widespread, long-lived, straight-line wind storm that is associated with a fast-moving group of severe thunderstorms known as a mesoscale convective system. Sign up for the AP's college football newsletter. Indiana: Welcomes Maryland to Bloomington next Saturday. ![]() Michigan: Returns home next Saturday for a showdown with No. It will be interesting to see if the voters punish Michigan for a less-than-stellar showing. The constant has been the defense, and it was every bit as good as advertised. The powerful ground game was mostly stymied. Michigan is still unbeaten but it's shield of invincibility took a major hit against an Indiana team that wasn't even at full strength on offense or defense. What they're lacking: a consistent offense. The defense and special teams, as usual, kept Indiana close. Indiana: Coach Tom Allen's team played its best first half of the season but still hasn't played a complete game all season. But Michigan, clearly, did not play its best ball as the nation's sixth-best scoring offense struggled to score. Michigan: The Wolverines have faced some strong tests in this series recently and they did again Saturday. Corum also scored on a 1-yard run just five plays into the game. Schoonmaker caught nine passes for 67 yards and Blake Corum had 124 yards rushing on 25 carries after picking up 50 on his first run of the day. McCarthy was 28 of 36 with 304 yards, three TDs and one interception. Luke Schoonmaker and Johnson caught fourth-quarter TD passes to seal it. The first of Johnson's two TD receptions capped Michigan's 98-yard drive to open the second-half and the defense only allowed 29 total yards over the final two quarters until Indiana's final drive. The emotional toll appeared to hurt the defending Big Ten champs, who went into the locker room tied at 10 with the Hoosiers (3-3, 1-2).īut after hearing Hart talk to the team at halftime, the Wolverines (3-0 Big Ten) promised to win the game for their coach - and they didn't disappoint. Many Wolverines players dropped to one knee while coach Jim Harbaugh and other assistants watched trainers tend to Michigan's running game coordinator. Hart went down unexpectedly after Indiana tied the score at 7.
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