Weeralarm V.S. #3 Extreem weer - Tornado touchdown

Tornado Risk for Louisiana... Again



Powerful thunderstorms, some capable of spawning tornadoes, will soon fire from Texas to Oklahoma then shift eastward into hard-hit Louisiana, the Florida Panhandle, Georgia, Tennessee and perhaps as far northeast as Ohio.
A multifaceted storm will target the middle of the nation today into Wednesday with snow and flooding rain in addition to the severe thunderstorms.
High winds, not associated with thunderstorms, were already causing damage and kicking up dust in California and neighboring states. This is a sign of a very dynamic system, much more so than the system that hit the south central states this past weekend.
The setup later today into Wednesday will bring the threat of multiple tornadoes. A few of the tornadoes could even be strong.



Along with the threat of tornadoes is the likelihood of multiple incidents of large hail, damaging wind gusts, lightning strikes and flash flooding.
Today/Tonight
The area of concern for today into tonight lies from Dallas and Oklahoma City eastward to Springfield, Mo., Memphis, Tenn., and New Orleans.
Severe Weather Expert and WeatherData.com CEO Mike Smith is concerned that many of the storms will occur after dark Today.
"Some of the forecast tornadoes may be especially dangerous because people will not realize the storms are there until they are at the doorstep," Smith said.



The waves of storms will progress to the east, crossing the Mississippi River and igniting to the south toward the Gulf Coast.
South and west of the main center of the large storm system, strong winds will roar in the clear air over parts of New Mexico and western Texas. The winds will be strong enough to kick up dust, knock over high profile vehicle and down power lines. The winds could also spread wildfires.
Wednesday and Beyond
Tuesday night into Wednesday, the greatest risk of tornadoes will be in the Deep South from Louisiana to the Florida Panhandle, including much of Mississippi and Alabama. However, severe thunderstorms could occur as far north as the Ohio Valley.
Like most others, this storm system will eventually reach the Atlantic coast. For much of this area the major threat may be flash and urban flooding.
At least a few of the storms along the Atlantic Seaboard late in the week could be heavy and gusty. However, it is certainly possible that severe weather rolls along part of the I-95 corridor from Florida to Maine.

Meteorology of the Outbreak
A surge of warm, moist air will roll northward over the lower Mississippi Valley and into the southern Plains today. At the same time a sweep of dry air will attack from the west.
The combination of these two clashing air masses along with a developing surface storm and jet stream energy from above will allow severe thunderstorm to develop.
The shifting of winds with height will cause some of these thunderstorms to rotate. The rotation, in turn, can yield a tornado.
In more technical terms, the storm system will take on what meteorologists call a "negative tilt."
Intensifying systems of this nature have a long history of producing multiple tornadoes because of the way they are stacked through various layers of the atmosphere.
They are indicative of a cold air invasion high in the atmosphere, which allows the rising column of air within the thunderstorms to always be warmer than its surrounding environment.

[ Bericht 3% gewijzigd door #ANONIEM op 08-03-2011 17:00:38 ]

Nu een tornado warning

Er zijn 3 meldingen geweest van tornado's.
En nu nog een tornadowarning bij Jackson

Nog weer nieuwe tornado waarschuwingen

Meerdere tornado waarschuwingen, idd in de buurt van Pensacola

[ Bericht 1% gewijzigd door #ANONIEM op 09-03-2011 19:17:54 ]

Weer zware buien vandaag

Severe Outbreak Next Week May Affect a Quarter of US



After Florida was ransacked two days in a row with tornadoes, wind damage and battering hail, another outbreak of severe thunderstorms, including the risk of tornadoes, is set to unfold across a much larger area of the country early next week.
"This severe weather outbreak may affect a quarter of the U.S.," AccuWeather.com Senior Meteorologist Mike Smith stated.
It's a storm set to unload more snow across areas from the Rockies into the Upper Midwest this weekend into early next week that will also spark the widespread severe weather to its south.
"This is a very serious weather situation we have coming up and we have been issuing pinpoint severe weather warnings the past several days," said Bradley J. Mitchell, Chief Commercial Officer of AccuWeather Enterprise Solutions, "Notifying our SkyGuard clients of how this severe weather could affect their most important assets is a top priority for us."
While a few thunderstorms affecting areas from Missouri into Iowa and parts of the lower Midwest Saturday night into Sunday could become severe (mainly due to hail), the main outbreak of severe weather will not get under way until Sunday night and Monday.
On Sunday night, nasty thunderstorms will strike an area from northeastern Texas to northern Illinois and Indiana. Chicago and St. Louis are both included in the zone at risk for damaging thunderstorms.
The greatest threat for tornadoes will lie from northwestern Illinois to eastern Iowa and Missouri.
Threats with this outbreak Monday and Tuesday will include high winds, capable of downing trees and power lines and causing structural damage, large hail, and torrential rainfall, and even tornadoes with the strongest of thunderstorms.
Travel disruptions, by ground and air, are likely. Power outages will also be a problem for communities that are hit.
Areas from the Ohio, Tennessee, and Lower Mississippi valleys will be at risk by Monday as an extensive line of severe thunderstorms develops. Cities and towns from East Texas to western Pennsylvania are included.
The threat will then expand farther east across the Southeast and mid-Atlantic Monday night into Tuesday.
Metropolitan areas that could be affected Monday include Pittsburgh, Pa., Columbus, Ohio, Indianapolis and Evansville, Ind., Memphis, Tenn., Shreveport, La., and Houston, Texas.
Areas that will have to be monitored for possible impacts Monday night into Tuesday include Atlanta, Ga., Raleigh and Charlotte, N.C., Charleston, S.C. The thunderstorms could end up being disruptive to Tuesday's practice round for the Masters Golf Tournament in Augusta, Ga., if the line of thunderstorms progresses slower than expected.
It is still uncertain how far south the severe weather will extend into Florida Tuesday. Areas such as Tampa and Orlando that were in the heart of severe weather last Wednesday into Thursday will be closely monitored for potential impacts.

Er zijn inderdaad al een aantal tornado waarschuwingen.

Eerste extreem onweer

In ons eigen land is het momenteel rustig lenteweer met veel zon en middagtemperaturen die iets boven normaal liggen voor de tijd van het jaar. Rustig is het bepaald niet aan de andere kant van de Atlantische Oceaan. In het zuidoosten en oosten van de Verenigde Staten was het afgelopen week zeer onstuimig. De eerste hevige onweersbuien raasden over diverse staten van het zuidelijk gelegen Louisiana tot in het noordoostelijk gelegen Maryland en vrijwel alle staten ten zuidoosten van die lijn. Ongeveer 1300 zogeheten ‘trained spotters’ namen binnen 24 uur windschade, verschillende tornado’s en waterhozen of hevig onweer waar. De eerste onweerssituatie van het seizoen gaat dan ook meteen de recordboeken in, niet per se voor de grote hoeveelheid blikseminslagen of de verschillende tornado’s, maar vooral voor de extreme windsnelheden die soms opliepen tot 136 kilometer per uur.

Vanuit het warme Caribische gebied werd die dag vrij warme lucht in de zuidoosthoek van de Verenigde Staten aangevoerd, maar tegelijkertijd trok vanuit het noorden een koufront deze regio binnen. De zeer warme Caribische lucht en de nog winterkoude lucht vanuit onder andere Canada botsten langs een bijna 1500 kilometer lange lijn van de staat Louisiana tot aan Maryland op elkaar, die daarna verder activerend naar het zuidoosten richting de oostkust trok. Koude lucht is zwaarder en de warme Caribische lucht schoof dan ook met hoge snelheid omhoog over de koude lucht heen. Snel stijgende, warme en bovendien vochtige lucht zijn de 3 ultieme ingrediënten voor hevige buien of in dit geval een buienlijn.
Die lijn resulteerde op veel plaatsen in die hoek van Amerika in extreem weer. Er zijn in de zeer korte tijd dat de lijn overtrok 626 extreem weer waarschuwingen uitgegeven. Het onweerde bijna aan één stuk door en ongeveer 340.000 keer bereikten bliksemflitsen de aarde tijdens de buien. Ook werden hagelstenen van bijna 8 centimeter in diameter waargenomen en kwam het rond 26 keer tot tornado’s en nog diverse keren tot zogeheten tuba’s (een funnel cloud, ofwel een tornado die de grond niet raakt) en waterhozen.
Trained spotters
Bij Meteo Consult maken we voor onze verwachting dagelijks gebruik van meetgegevens en data van een groep vaste waarnemers. Deze hebben vaak een weerstation in de tuin of op het dak staan en mailen deze gegevens aan ons door. Ook bij extreem weer laten zij vaak van zich horen en dagelijks komen bovendien honderden foto’s binnen van weerliefhebbers en waarnemers. Deze waarnemers bevinden zich op allerlei verschillende plaatsen van het land en naast de officiële modelgegevens geven hun gegevens een duidelijk beeld van de situatie op een bepaald moment. Ook gebruiken we de gegevens van het waarnemersnetwerk van Het weer actueel.
In de Verenigde Staten werken weerbureaus samen met zogeheten ‘trained weather spotters’. Dit zijn waarnemers die hun gegevens doorsturen, maar het woord ‘trained’ laat al zien dat deze waarnemers er voor opgeleid zijn. De NWS, National Weather Service’ organiseert eens in de zoveel tijd een gratis cursus over de structuren en vorming van hevige onweer- of hagelbuien, maar ook de vorming van een tornado of een orkaan komt in de cursus aan bod. In principe kan iedereen naar deze cursussen, maar vaak zijn het mensen die op wat voor een manier dan ook al met het weer bezig zijn voor hun werk, zoals brandweermannen of mensen die in de wegenbouw zitten. Zij leren in deze cursussen om de horizon te scannen naar omstandigheden en voorwaarden die zouden kunnen leiden tot trechterwolken (tuba), arcus (shelfcloud), een tornado, etc. Na zo’n training krijgen zij een identificatienummer en deze gebruiken zij in het waarnemingsnetwerk van ruim 280.000 personen in de hele USA.
Recordhoogte
Tijdens de hevige buien van afgelopen 4 april kwamen ruim 1300 rapporten vanuit allerlei hoeken in het zuidoosten en oosten van de Verenigde Staten binnen. Alleen al voor extreem weer kwamen 626 meldingen binnen. Hiermee komt deze dag uit op de derde plek in de recordboeken in de lijst van meest actieve ‘zwaar weer dagen’. Op de eerste plaats staat het extreme weer op 7 april 2006, toen kwamen meer dan 700 meldingen binnen.

bron

Upper Midwest Faces Worst of Today's Tornado Outbreak



The atmosphere is ripe for an outbreak of destructive tornadoes and violent thunderstorms to ignite across the Heartland of the U.S. this afternoon and tonight, with the greatest threat centered over the Upper Midwest.
"There is potential for loss of life and widespread destruction is some communities," AccuWeather.com Expert Senior Meteorologist Alex Sosnowski warned about the impending outbreak.
The severe weather event will get under way this afternoon as intense thunderstorms erupt from southeastern Minnesota and western Wisconsin to northeastern Texas.
The violent thunderstorms will then shift to lower Michigan, the lower Ohio Valley and central Texas as tonight progresses.
The threat for destructive tornadoes will be highest this afternoon and evening before the violent thunderstorms form into a more organized squall line.
While an isolated tornado cannot be ruled out as far south as Texas, the Upper Midwest is where the atmosphere will fuel the development of multiple strong and long-tracking tornadoes.
More specifically, the greatest threat to lives and property from the tornadoes will encompass southeastern Minnesota, a large portion of Wisconsin, eastern Iowa and northwestern Illinois.
Cities at risk include Minneapolis, Minn., Rochester, Minn., Eau Claire, Wis., Madison, Wis., Cedar Rapids, Iowa, and Rockford, Ill. This zone lies just south of Duluth, Minn.
The tornadoes could leave a trail of damage similar or worse than what was reported across western Iowa Saturday evening.
Fortunately, no lives were lost due to Saturday's tornadoes. Residents across the nation's Heartland should heed tornado safety tips and tornado warnings to assure the same can be said for later today.
However, Sosnowski cautioned that "you don't have to be hit by a tornado to have major damage or to be at risk for injury."
In addition to spawning tornadoes, any of the strongest thunderstorms from the Upper Midwest to Texas will be capable of unleashing damaging winds, golf ball- to baseball-sized hail, flash flooding and frequent lightning.
All of the severe weather-related injuries on Saturday were the result of either damaging winds or a lightning strike, not tornadoes.
Strong winds within violent thunderstorms can do more than litter yards and roads with trees and power lines. Semi-trucks and campers can get overturned. Falling trees could cause bodily harm or death, even to those in cars.
The threat for the severe thunderstorms will not end with the weekend. On Monday, the danger zone will shift to the Ohio Valley and Deep South.

Vandaag een moderate risk voor severe weather.

Nog steeds waarschuwingen voor tornado's



[ Bericht 58% gewijzigd door #ANONIEM op 15-04-2011 13:53:16 ]

Strong Storm, Tornado Threat Shifts to the Southeast



Following deadly tornadoes and strong thunderstorms across the nation's midsection late Thursday, the threat for powerful storms will shift to the Southeast today.
A line of damaging thunderstorms will plow through the lower Mississippi Valley first today, impacting cities such as Alexandria, La., Vicksburg, Miss., and Jackson, Tenn., this morning.
By this afternoon and evening, more storms are expected to blossom farther east, making for a potentially active severe weather day across the Mississippi Delta region, the Florida Panhandle, much of Alabama and Mississippi and areas north to the Ohio Valley.
The primary threat from most of the storms will be powerful wind gusts, perhaps greater than 70 mph, as well as large hail that could shatter car windshields and damage homes.
The threat for tornadoes is also particularly high today. Whether at work, home or on the road, stay alert for any possible tornado warnings and seek a safe shelter right away if warned.
Safe shelters for those indoors include basements, interior closets and hallways. Mobile homes and vehicles should be abandoned for a secure building right away.
Cities that are under the threat for severe storms today include Evansville, Ind., Louisville and Bowling Green, Ky., Nashville, Tenn., Huntsville, Birmingham and Montgomery, Ala., Jackson, Miss., Baton Rouge and New Orleans, La., and Pensacola, Fla.



Numerous interstates will be impacted, including I-10, I-24, I-40, I-55, I-59, I-65 and I-85.
Given the powerful nature of the parent storm system, the threat for severe thunderstorms and isolated tornadoes will persist well after dark as storms march east into western Florida, Georgia and the southern Appalachians.
Asheville, N.C., Atlanta, Ga., and Tallahassee, Fla., are among the locations that could see a dangerous thunderstorm by nightfall.
On Saturday, severe storms could approach the Atlantic coastline, threatening communities from the Delmarva Peninsula south to the coast of eastern Florida.