[QODLink]
Weather

More violent winds developing in the US

Yet more severe weather with damaging windstorms expected across the Midwest over the next few days.

Last Modified: 12 Jun 2013 11:15
Email Article
Print Article
Share article
Send Feedback
Derechos can exceed 1000 km in length, with damaging winds downing trees and power lines [REUTERS]

After what has already been a very active tornado season for the US, meteorologists are now warning of the possibility of severe windstorms hitting some parts over the next few days. This next round of bad weather is due to a feature known as a derecho.

The word derecho literally means ‘straight’ in Spanish. The weather phenomenon is defined as a widespread and long-lived windstorm that accompanies rapidly moving showers and thunderstorms. They can trigger tornadoes, lightning and large hail storms.

The storms are expected to form across South Dakota to Pennsylvania. Cities at risk include Milwaukee, Chicago, Cleveland, Indianapolis, Cincinnati, Detroit, Baltimore, Washington, Pittsburgh and Louisville.

Derechos typically strike the lower Midwest states once every year, but are relatively rare across the Mid-Atlantic States. On average, this region is affected by them once every four years.

To be classed as a derecho, a storm must cause damage over 400 kilometers and contain gusts of wind at least 93 kph. Last year on June 29 a small group of thunderstorms developed in the Chicago area.

The storm steadily rumbled eastwards. As they did so, they gathered power and momentum, reaching a peak over Virginia and Washington DC, around 1000 km away. Winds gusting as high as 145 kph were recorded.

The damaged caused by the storm was estimated to be on par with an EF-1 tornadom but over a much larger area. There was a trail of destruction over 1000 km long across the Midwest and Mid-Atlantic, cutting power to four million residents and killing 13 people.

265

Source:
Al Jazeera
Email Article
Print Article
Share article
Send Feedback
Topics in this article
Country
City
Featured on Al Jazeera
Your chance to be an investigative journalist in Al Jazeera’s new interactive game.
An innovative rehabilitation programme offers Danish fighters in Syria an escape route and help without prosecution.
Street tension between radical Muslims and Holland's hard right rises, as Islamic State anxiety grows.
Take an immersive look at the challenges facing the war-torn country as US troops begin their withdrawal.
Featured
Private citizens take initiative to help 'irregular' migrants, accusing governments of excessive focus on security.
Indonesia's cassava plantations are being killed by mealybugs, and thousands of wasps will be released to stop them.
Violence in Ain al-Arab has prompted many Kurdish Syrians to flee to Turkey, but others are returning to battle ISIL.
Unelected representatives quietly iron out logistics of massive TPP and TTIP deals among US, Europe, and Asia-Pacific.
Led by students concerned for their future with 'nothing to lose', it remains to be seen who will blink first.