Megastorm voor de VS

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Meteorologen van AccuWeather geven alarm voor een wijdverspreid risico op ernstig weer dat zich van zondagmiddag tot maandag uitstrekt over het centrale en oostelijke deel van de Verenigde Staten. Meer dan een dozijn staten lopen risico op hevige onweersbuien.

Terwijl de drievoudige bedreiging van de maart megastorm zich over het centrale deel van de VS beweegt en sneeuwstormachtige omstandigheden en hoge winden naar delen van het Midwesten brengt, wordt een grote onweerslijn verwacht die zich langs de bijbehorende Arctische frontlijn naar het oosten uitbreidt van zondag op maandag. Sommige van deze onweersbuien kunnen destructieve winden, tornado's en zware regenval veroorzaken.

Hoog Risico op Ernstig Weer op Zondag
Het risico op ernstig weer begint zondagmiddag en gaat door tot zondagavond, van Texas tot zuidwestelijk Michigan, wanneer het front in contact komt met de toenemende vochtigheid die uit de Golf van Mexico komt.

https://www.accuweather.c(...)l-eastern-us/1873345

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AccuWeather meteorologists are highlighting a 'high' risk for severe storms from northern Louisiana and central Mississippi to portions of southern Illinois and western Kentucky, warning of damaging straight-line winds, among other threats.

The main hazard will be widespread damaging wind gusts from 70-80 mph as the squall line moves across the region. Small hail, torrential downpours and even tornadoes can also occur. The AccuWeather Local StormMax™ is 95 mph.

"Severe storms across parts of western Kentucky into western Tennessee, including cities such as Paducah, Kentucky; Nashville and Memphis, Tennessee, can occur at night, which can be especially dangerous," said AccuWeather Senior Meteorologist Dan Pydynowski. "People in these areas should have their phones charged, a NOAA weather radio and audible alerts enabled on the AccuWeather app for when they go to bed at night so they can be woken up to take shelter if damaging winds or tornadoes approach their house."

https://www.accuweather.c(...)l-eastern-us/1873345

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...From Georgia and the Florida Panhandle...
Early day storms may be ongoing from the southern Appalachians
toward the FL Panhandle Monday morning, and the environment will
already be favorable for supercells including tornado potential.
Forecast soundings indicate substantial instability with mid to
perhaps upper 60s F along with ample shear. These storms may also
produce hail, as midlevel lapse rates approach 7 C/km.

...Carolinas into MD/PA and vicinity...
Areas of showers may occur early in the day especially but should
rapidly lift north, allowing areas of heating and gradual
destabilization over the entire area. As the surface trough deepens,
low-level wind will back and strengthen throughout the day.
Supercells producing tornadoes appear most likely ahead of the cold
front from SC into NC and southern VA. Models vary with degree of
instability, but strong tornadoes do appear possible with effective
SRH of at least 300-400 m2/s2. Fast storm motions over 50 kt suggest
a long tracked tornado will be possible.

Meanwhile, a robust line of storms will develop as the cold front
pushes east, stretching from the Carolinas to southern NY. With a
moist air mass and large-scale support, this line is expected to
produce particularly damaging winds, along with QLCS tornadoes
across the remainder of SC/NC, VA, MD, and much of southern PA. This
will likely peak during the late afternoon hours. The activity may
eventually interact with cool trajectories off the Atlantic during
the evening.

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Fast moving thunderstorms may become widespread and accompanied by
the risk for damaging wind gusts and a few tornadoes across the Mid
Atlantic today. There is potential that a couple of storms could
become capable of producing strong and long track tornadoes.