Tornado's in de VS #25 A new day

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Storm, flood and tornadoes across Alabama and Mississippi
Tens of thousands of people have lost power as severe weather rolled through the southern United States and turned deadly on Monday, January 2, 2017. As of early January 3 (UTC), at least 5 people have lost their lives. Authorities fear the death toll will rise and urge people to pay attention to the warnings and act accordingly.

A low pressure system brought severe thunderstorms to parts of the South on Monday, spinning off several tornadoes, flooding widespread areas and leaving more than 100 000 people without power.

The first line of storms storm hit parts of Texas around 05:00 local time, downing power lines, dropping small hail and sparking at least one house fire. At least 18 000 were without power. The second line of storms rolled in with the sunrise causing flash flooding.

The storms then headed east, causing significant damage to Louisiana, Mississippi, Alabama, and Florida. Much of the damage was caused by flash flooding after a series of storms soaked the region over the past week. Some regions received up to 180 - 230 mm (7 to 9 inches) of rain in just a couple of days.

In Louisiana, a possible tornado reportedly damaged several homes in LeCompte. Severe damage was also reported throughout Avoyaleles Parish, including houses that trees fell through and a building that lost its roof. More than 16 000 customers in the state were without power at one point.

In Alabama, four people were killed in a single home when a tornado hit the town of Rehobeth in the state's south and crashed a tree onto their mobile home.

In Florida, the body of a 70-year-old man was found floating outside his travel-trailer, the Walton County Sheriff's Office said. The death was ruled an accidental drowning.

Downed trees and damaged buildings were reported in at least 28 counties in Mississippi, 15 parishes in Louisiana and 15 counties in Texas, The Weather Channel meteorologist Danielle Banks said.

In Mississippi, a confirmed tornado touched down Monday afternoon near Mendenhall, southeast of Jackson. A second, radar confirmed tornado hit near Mt. Olive, about 13 km (8 miles) northeast of Collins.

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The frequency of large tornado outbreaks in the US is increasing
The frequency of large-scale tornado outbreaks is increasing in the United States, particularly when it comes to the most extreme events, according to research recently published in Science.

The study by researchers including Joel E. Cohen, a visiting scholar at the University of Chicago, finds the increase in tornado outbreaks does not appear to be the result of a warming climate as earlier models suggested. Instead, their findings tie the growth in frequency to trends in the vertical wind shear found in certain supercells—a change not so far associated with a warmer climate.
"What's pushing this rise in extreme outbreaks, during which the vast majority of tornado-related fatalities occur, is far from obvious in the present state of climate science," said Cohen, the Abby Rockefeller Mauzé Professor at Rockefeller University and Professor of Earth and Environmental Sciences at Columbia University, who conducted the research while a visiting scholar in UChicago's Department of Statistics.

Tornado outbreaks are large-scale weather events that last one to three days, featuring several thunderstorms and six or more tornadoes in close succession. In the study, published in the Dec. 16 issue of Science, the researchers used new statistical tools, including extreme value analysis—a branch of statistics dealing with deviations—to analyze observation-based meteorological estimates associated with tornado outbreaks together with National Oceanic and Atmospheric Administration datasets.

The researchers estimated that the number of tornadoes in the most extreme outbreak in a five-year interval doubled over the last half-century. This means that in 1965 the worst outbreak expected over five years would have had about 40 tornadoes, while in 2015 the worst outbreak expected over five years would have had about 80 tornadoes.

"Viewing the data on thousands of tornadoes that have been reliably recorded in the United States over the past half-century as a population has permitted us to ask new questions and discover new, important changes in outbreaks of these tornadoes," Cohen said.

To understand the increased frequency in tornado outbreaks, the researchers looked at two factors: convective available potential energy, or CAPE, and storm relative helicity, which is a measure of vertical wind shear.

Earlier studies had projected a warming climate would increase CAPE, creating conditions favorable to a rise in severe thunderstorms—and potentially tornado outbreaks. But Cohen and his colleagues found the increases in outbreaks were driven instead by storm relative helicity, which has not been projected to increase under a warming climate.

"Our study raises new questions about what climate change will do to severe thunderstorms and what is responsible for recent trends," said co-author Michael K. Tippett, an associate professor at Columbia University's Fu Foundation School of Engineering and Applied Science. "The fact that we didn't see the presently understood meteorological signature of global warming in changing outbreak statistics for tornadoes leaves two possibilities: Either the recent increases are not due to a warming climate, or a warming climate has implications for tornado activity that we don't understand."

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Op vrijdag 20 januari 2017 14:36 schreef Nattekat het volgende:

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Dat is vroeg

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High-risk declarations for severe weather are rare. The last such issuance was June 3, 2014, according to Weather.com and hasn’t occurred in winter since 2008 . Since 1984, 42 percent of tornado fatalities have coincided with such high-risk days, according to the Weather Channel’s Kathryn Prociv.

The region under high risk hasn’t seen such a designation in a decade, the website for U.S. Tornadoes reported.

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Large tornado damages NASA rocket factory in New Orleans

A large tornado ripped through New Orleans and the surrounding area Tuesday, leaving a swath of devastation in its wake and damaging NASA's Michoud Assembly Facility in the city.

It's unclear how much damage the facility, which is helping to manufacture NASA's next mega-rocket, sustained.

"At 11:25 a.m. CST, a tornado impacted NASA’s Michoud Assembly Facility in New Orleans. At this time, only minor injuries have been reported and NASA employees and other tenants are being accounted for," NASA spokesperson Tracy McMahan said in an email.

SEE ALSO: Over a dozen dead as violent storms slam Southeast U.S.

"There is still a threat of severe weather in the area and emergency officials are continuing to monitor the situation to ensure the safety of onsite personnel," McMahan added.

"The onsite Michoud emergency response team is also conducting damage assessments of buildings and facilities."

During the space shuttle era, Michoud was responsible for assembling and testing the external tanks used to store the propellant that would power shuttles into orbit.

Today, Michoud is helping to test and build hardware for NASA's Space Launch System (SLS) rocket and the Orion spacecraft, designed to deliver humans to deep space destinations like the moon and Mars in the coming decades. The SLS rocket is slated to be the most powerful the agency has ever built.

NASA is not yet sure whether any of the spacecraft hardware at Michoud was damaged during the storm.

Michoud Assembly Facility Tornado damage Feb 7 2017

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Op woensdag 8 februari 2017 10:16 schreef Pannenkoekenmix het volgende:
Volgens mij kun je aan het formaat helemaal niet zien hoe sterk de tornado was.

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Op basis van de schade dan denk ik ook wel dat het een F2 moet zijn geweest.

En die mensen die daar staan te filmen zijn inderdaad echt niet goed bij hun hoofd.

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Storm damage reported in Bulloch, Effingham counties

Reports of storm damage are coming into the WTOC newsroom from a fast-moving system that rolled across our area between 3 and 5 a.m. Thursday morning.

We are hearing of power outages, multiple trees down and at least two homes damaged with occupants possibly trapped inside on Old River Road South four miles East of Stilson in Bulloch County.

Bulloch County EMA has confirmed that at least seven people were injured in homes on Lilly Hagen Road and Old River Road South. One person was flown by LifeStar to a hospital in Savannah with serious injuries, and six others were driven to East Georgia Regional in Statesboro.

Storm damage and power outages have also been reported in Effingham County. A pumphouse was reportedly destroyed, homes damaged and numerous trees and power lines were blown down in Pineora.

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Radar detecting possible tornado 4 miles northeast of Wharton. Moving NE toward Needville.

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Op dinsdag 14 februari 2017 15:38 schreef Nattekat het volgende:

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Is dat live?