LIVE: Tornado's in de VS #24 Outbreak expected

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TWCAlexWallace twitterde op dinsdag 23-02-2016 om 16:39:31 Dangerous day ahead of severe weather. TORCON now up to 8. That means an 80% chance of tornado within 50 miles! https://t.co/rndkrZt8IJ reageer retweet

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Op maandag 15 februari 2016 15:54 schreef Frutsel het volgende:

Incredible CCTV footage of a 95mph tornado hitting school

2 Februari 2016: Tennessee

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Op dinsdag 23 februari 2016 16:41 schreef Frutsel het volgende:

twitter:

TWCAlexWallace twitterde op dinsdag 23-02-2016 om 16:39:31 Dangerous day ahead of severe weather. TORCON now up to 8. That means an 80% chance of tornado within 50 miles! https://t.co/rndkrZt8IJ reageer retweet

twitter:

28storms twitterde op dinsdag 23-02-2016 om 19:28:42 Multi-Vortex waterspout over Lake Pontchartrain moments ago #lawx via @WWLTV live stream https://t.co/jbth8M8uIA reageer retweet

twitter:

stormchaser4850 twitterde op dinsdag 23-02-2016 om 22:31:23 DEVELOPING: 3:28 PM CST: LARGE, EXTREMELY DANGEROUS #TORNADO over #BelleRose #LAwx https://t.co/Z43SP2dmKa https://t.co/v0hgPjhsEt reageer retweet

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Op dinsdag 23 februari 2016 22:34 schreef Frutsel het volgende:

twitter:

stormchaser4850 twitterde op dinsdag 23-02-2016 om 22:31:23 DEVELOPING: 3:28 PM CST: LARGE, EXTREMELY DANGEROUS #TORNADO over #BelleRose #LAwx https://t.co/Z43SP2dmKa https://t.co/v0hgPjhsEt reageer retweet

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taniadall twitterde op woensdag 24-02-2016 om 00:01:48 #Breaking: Manager at Sugar Hill RV Park in Convent, La confirms at least 100 trailers damaged b/c of storm; many people seriously hurt. reageer retweet

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NWSJacksonMS twitterde op woensdag 24-02-2016 om 00:24:17 5:24 PM: Lamar County EMA confirms a fatality at a destroyed mobile home along Sones Rd west of Petal. Occurred around 4:15-4:20 pm. reageer retweet

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weartv twitterde op woensdag 24-02-2016 om 03:33:50 BREAKING: Reports of several buildings destroyed at the Moorings Apartments in Pensacola. Details to come. #C3N #StormWatch reageer retweet

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Southeast Tornadoes, Storms Kill Three, Head for Atlantic Coast

A damaging storm system that spun off multiple tornadoes from Louisiana to Florida killed at least three people and critically injured at several others as it moved through the South, with more twisters likely to come Wednesday along the Atlantic coast.

Two people were killed as a tornado touched down near the Sugar Hill RV Park northwest of the town of Convent, Louisiana. At least 30 people were treated at hospitals, seven of them in critical condition, said Brandon Keller, a spokesman for the St. James Parish Sheriff's Office.

A third person was killed in Lamar County, Mississippi, county Coroner Cody Creel told NBC News, identifying the man as Harris Dale Purvis, 73. The National Weather Service said radar indicated a possible tornado at the scene, where a mobile home was destroyed.

The system then crawled into southern Alabama and northern Florida late Tuesday.

A tornado injured six people and seriously damaged three buildings at an apartment complex in Pensacola, Florida, said Amanda Taft, a spokeswoman for the Escambia County Board of County Commissioners. The extent of the injuries wasn't immediately known, Taft told NBC News.

The National Weather Service reported that a car was blown off Interstate 10 near Brent in Escambia County and that vehicles were overturned on other roads. The Florida Highway Patrol closed a 26-mile stretch of I-10 in Escambia and Okaloosa counties and urged motorists to stay home and off the roads.

NBC station WPMI of nearby Mobile, Alabama, reported that trees were also uprooted onto other roadways, blocking traffic and delaying the arrival of emergency crews. About 9,200 customers were without power in the Panhandle, Gulf Power said at 11:15 p.m. ET.

Behind the storm, the governors of Louisiana and Mississippi declared emergencies as recovery efforts got under way.

twitter:

BTSullivan91 twitterde op woensdag 24-02-2016 om 04:47:57 This guy publicly bashed NWS with vulgar language. Hours later his town was hit hard with a #tornado... Wow. #flwx https://t.co/L3UOrigidF reageer retweet

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Op dinsdag 23 februari 2016 19:33 schreef Houtenbeen het volgende:

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28storms twitterde op dinsdag 23-02-2016 om 19:28:42 Multi-Vortex waterspout over Lake Pontchartrain moments ago #lawx via @WWLTV live stream https://t.co/jbth8M8uIA reageer retweet

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Video: Triple Waterspout Caught On Camera over Lake Pontchartrain Near New Orleans 23/2/2016

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LeFevreWX twitterde op woensdag 24-02-2016 om 22:10:48 Viewer photos from Jason Smith-Evergreen at 3:30pm @MarParNews @wx_will @gflickinger @ABC13News #vawx https://t.co/Q5Tlrsff3o reageer retweet

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Extreme tornado outbreaks on the rise: study

Extreme tornado outbreaks have become more frequent and the average number of tornadoes in such outbreaks has also risen since 1954, a new study has found.

Most death and destruction inflicted by tornadoes in North America occurs during outbreaks - large-scale weather events that can last one to three days and span huge regions.
The largest ever recorded happened in 2011. It spawned 363 tornadoes across the US and Canada, killing more than 350 people. The researchers said they do not know what is driving the changes.

"It could be global warming, but our usual tools, the observational record and computer models, are not up to the task of answering this question yet," said lead author Michael Tippett, from the Columbia University in US.

Many scientists expect the frequency of atmospheric conditions favourable to tornadoes to increase in a warmer climate - but even today, the right conditions do not guarantee a tornado will occur.

Every year, North America sees dozens of tornado outbreaks. Some are small and may give rise to only a few twisters; others, such as the so-called "super outbreaks" of 1974 and 2011, can generate hundreds.

In the simplest terms, the intensity of each tornado is ranked on a zero-to-five scale, with other descriptive terms thrown in.

For the study, researchers calculated the mean number of tornadoes per outbreak for each year as well as the variance around this mean.
They found that while the total number of tornadoes rated F/EF1 and higher each year has not increased, the average number per outbreak has, rising from about 10 to about 15 since the 1950s.

Extreme outbreaks have become more frequent because of two factors, Tippett said. First, the average number of tornadoes per outbreak has gone up; second, the rapidly increasing variance, or variability, means that numbers well above the average are more common.

"The scientific community has thought a great deal about how the frequency of future weather and climate extremes may change in a warming climate," Tippett said.

"The simplest change to understand is a shift of the entire distribution, but increases in variability, or variance, are possible as well. With tornadoes, we're seeing both of those mechanisms at play," Tippett added.