Tempo Severo EUA - 2017

Monitoramento de Tempo Severo no Brasil e no mundo. Fotografia e vídeo.
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Tavares
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Re: Tempo Severo EUA - 2017

Mensagempor Tavares » segunda jun 12, 2017 5:36 pm

Essa semana o tempo severo deve retornar aos EUA e também atingir o Canadá.

Hoje, risco moderado pra áreas do Wyoming, Dakota do Sul e Nebraska com significativo risco de tornados intensos e granizos grandes.
A área a ser afetada é bem pouco povoada, o perímetro de risco moderado (risco grau 4) abrange 90.000 habitantes e o de risco aumentado (risco grau 3) pouco mais de 500.000
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SITUAÇÃO PARTICULARMENTE PERIGOSA para a ocorrência de tornados está em vigor para o sudeste do Wyoming, Norte do Colorado e o Panhandle de Nebranka
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Há três métodos para ganhar sabedoria: primeiro, por reflexão, que é o mais nobre; segundo, por imitação, que é o mais fácil; e terceiro, por experiência, que é o mais amargo.
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Re: Tempo Severo EUA - 2017

Mensagempor Felipe F » quinta ago 17, 2017 12:05 pm

Pelo menos 9 tornados foram reportados ontem, 8 em Minnesota e 1 em Illinois.
Os tornados causaram danos, mas felizmente ninguém ficou ferido.
Fortes tempestades também foram registradas no TX, KS, OK e MO.

https://www.youtube.com/watch?v=YTXHqWFkgBg

https://www.youtube.com/watch?v=uAnywa5gaLs

https://www.youtube.com/watch?v=dBp6Hxa3yKs

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Re: Tempo Severo EUA - 2017

Mensagempor André Luiz DS » segunda ago 21, 2017 12:25 pm

Intensas tempestades estão percorrendo a região centro-sul da Dakota do Sul neste momento:
Não tem Permissão para ver os ficheiros anexados nesta mensagem.

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Re: Tempo Severo EUA - 2017

Mensagempor Felipe F » quinta ago 31, 2017 8:44 pm

Harvey já causou cerca de 50 tornados desde que chegou aos EUA.
Hoje pelo menos 8 foram reportados entre MS, AL e TN hoje.
O tornado mais forte ocorreu próximo de Reform, AL.

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Re: Tempo Severo EUA - 2017

Mensagempor Felipe F » sexta set 01, 2017 1:07 pm

Mais tornados são esperados hoje devido ao ciclone Harvey.
Os tornados estão previstos para ocorrer na região das Carolinas.

Alabama ontem:
https://www.youtube.com/watch?v=J_Q8ei_d3uY

https://www.youtube.com/watch?v=R3goQYculY8

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Re: Tempo Severo EUA - 2017

Mensagempor Felipe F » domingo set 17, 2017 3:26 pm

37 tornados confirmados durante o furacão Harvey.
O mais forte foi classificado com EF2.

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Re: Tempo Severo EUA - 2017

Mensagempor Tavares » sexta out 20, 2017 1:43 pm

Risco de grau 3 (enhanced) pra Oklahoma amanhã 21/10.
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...SUMMARY...
Widespread thunderstorm development is expected late Saturday
afternoon into Saturday night, from portions of the upper
Mississippi Valley into the southern Plains. Some of this activity,
particularly across the Plains, will be accompanied by a risk for
potentially damaging wind gusts, some hail and perhaps a couple of
tornadoes.

...Synopsis...
Models indicate that large-scale mid/upper troughing, currently
advancing inland of the Pacific Coast, will remain progressive
through this period, likely reaching Manitoba, northwest Ontario,
the upper Mississippi Valley and southern U.S. Plains by 12Z Sunday.
Within this regime, the corridor of strongest mid-level height
falls are forecast to spread east/northeast of the Canadian Prairies
and northern U.S. Plains Saturday/Saturday night, associated with a
couple of significant embedded short wave impulses. But another
digging impulse may contribute to mid-level height falls across the
southern Plains Red River Valley region Saturday night, while
beginning to split away from the base of larger-scale troughing to
the north.

In lower levels, a deep associated surface cyclone is forecast to
migrate from southern Manitoba into Hudson Bay, while a modest
trailing cold front advances eastward/southeastward through much of
the U.S. Plains and mid/upper Mississippi Valley region by the end
of the Period.

...Plains/Mississippi Valley...
Models generally indicate that the mid-level cold core and strongest
mid-level forcing for ascent may tend to lag to the west of the cold
front through the period. And severe weather potential, in general,
may hinge on how fast the eastward and southeastward advancing cold
front tends to undercut the pre-frontal initiating convective
development, which remains unclear at this time. However, it
appears that there will be at least a window of opportunity for
substantive pre-frontal thunderstorm activity, accompanied by a risk
for severe weather.

At least a narrow plume of seasonably moist air (characterized by
mid/upper 60s surface dew points) appears likely to precede the
front in a corridor from the southern Plains into the upper
Mississippi Valley. Models suggest that low-level moistening will
occur beneath a plume of modestly steep lapse rates associated with
elevated mixed layer air, which may contribute to CAPE up to 1000+
J/kg, and 2000 J/kg across north central Texas into Oklahoma.

Although deep layer wind fields are not expected to be exceptionally
strong, 30-50 kts in lower/mid-levels (somewhat stronger across
parts of the lower Missouri Valley into upper Mississippi Valley),
should be more than sufficient to support organized severe weather
potential, given the instability. Guidance appears suggestive that
vigorous storm development may initiate first across parts of the
east central Plains and middle Missouri Valley late Saturday
afternoon, before intensifying while increasing and spreading
northeastward toward the upper Mississippi Valley through Saturday
evening. This could include isolated discrete supercells early,
before evolving into a broken squall line, with damaging wind gusts
becoming the primary severe threat.

Farther south, stronger instability, coupled with increasing forcing
for ascent (enhanced by increasingly divergent high-level flow) may
support storm initiation across parts of western/northern Oklahoma
and adjacent portions of the Plains by early Saturday evening. This
may include discrete supercells initially, in a corridor ahead of
the cold front, and near its intersection with the dry line.
However, fairly rapid and considerable upscale convective growth
appears probable, with potentially damaging wind gusts becoming the
primary concern by mid to late evening, before tending to become
undercut by the southward advancing cold front.

..Kerr.. 10/20/2017
Há três métodos para ganhar sabedoria: primeiro, por reflexão, que é o mais nobre; segundo, por imitação, que é o mais fácil; e terceiro, por experiência, que é o mais amargo.
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Existem várias maneiras de um país alcançar o desenvolvimento, e nevar não é uma d'elas

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Re: Tempo Severo EUA - 2017

Mensagempor Felipe F » sábado out 21, 2017 10:17 pm

Granizo e ventos fortes foram reportados no TX, OK e KS.
Pelo menos dois tornados reportados em OK, um em andamento neste momento.

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Re: Tempo Severo EUA - 2017

Mensagempor Felipe F » domingo out 22, 2017 12:52 am

Fracos e breves tornados sendo reportados hoje em Oklahoma.
Um tornado atingiu Norman, OK causando alguns danos.

https://www.youtube.com/watch?v=0Q500nddU0I

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Re: Tempo Severo EUA - 2017

Mensagempor Felipe F » domingo out 22, 2017 1:08 am

Dano próximo de Norman, OK.

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Re: Tempo Severo EUA - 2017

Mensagempor Felipe F » sexta nov 03, 2017 11:35 am

Risco de tempo severo no próximo domingo em áreas do MO, IL, IN, OH, MI e KY.
O maior risco parece ser ventos fortes e granizo, com a ameaça de tornados concentrada entre Indiana e Illinois.

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Day 3 Convective Outlook
NWS Storm Prediction Center Norman OK
0230 AM CDT Fri Nov 03 2017

Valid 051200Z - 061200Z

...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF
IL/IN AND NORTHWESTERN OH...

...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF
THE MID MS VALLEY INTO THE OH VALLEY AND LOWER GREAT LAKES...

...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS SURROUNDING THE
SLIGHT RISK...

...SUMMARY...
Scattered severe thunderstorms capable of producing large hail,
damaging winds, and a few tornadoes may occur across parts of the
Lower Great Lakes, Midwest, and Ohio Valley regions on Sunday.

...Synopsis...
A split mid/upper-level jet structure will likely be present over
much of the western/central CONUS on Sunday, with modest 500 mb
height falls forecast to spread across the mid/upper MS Valley and
Great Lakes region through Sunday evening. Large-scale lift
associated with the strong southern branch of the mid/upper-level
jet (100+ kt at 250 mb and 60-70+ kt at 500 mb) should promote
convective development across parts of the lower Great Lakes,
Midwest, and OH Valley by Sunday afternoon. An elevated mixed layer
with steep mid-level lapse rates (generally 7-8 C/km in the
700-500-mb layer) emanating from the central/southern Plains is
expected to overspread these regions through the period.

At the surface, a broad moist warm sector will be in place across TX
and the lower MS Valley into parts of the Southeast, TN/OH Valleys,
Midwest, and lower Great Lakes. Surface dewpoints reaching into at
least the low to mid 60s should be common across the warm sector
Sunday afternoon. A weak surface low should develop northeastward
along a warm/cold front triple point from the vicinity of eastern
KS/western MO to the lower Great Lakes by Sunday evening. A trailing
cold front should progress slowly southeastward across the mid MS
Valley and parts of the Midwest/OH Valley through early Monday
morning.

...Lower Great Lakes/Midwest into the OH Valley and Mid MS Valley...
Strong effective shear associated with the previously mentioned
southern-stream mid/upper-level jet will favor supercell structures
with any initial convective development along the warm front and
across the open warm sector. Given the steep mid-level lapse rates
and rich low-level moisture that will be present across this region,
potentially moderate buoyancy should develop by Sunday afternoon
even with only modest diurnal heating. Scattered large hail, some
possibly significant, may occur with these supercells, particularly
across parts of central/eastern IL into western IN where buoyancy
should be greatest. Damaging downdraft winds will also be a threat
with any supercell as low-level lapse rates steepen with diurnal
heating. The tornado potential should be maximized along the surface
warm front and east of the low where low-level winds will be locally
backed to a more southerly direction (versus generally southwesterly
elsewhere).

There is at least some potential for isolated elevated convection to
be ongoing at the start of the period across IL/IN in association
with a southwesterly low-level jet. This activity, should it occur,
may delay diurnal destabilization of the warm sector, and could
result in lower severe potential than currently indicated.
Considerable uncertainty also remains concerning the northward
extent of the warm sector Sunday afternoon/evening, and severe
probabilities will likely need to be refined once model agreement
increases in the location of the warm front and best potential for
surface-based convection. Eventual upscale growth into one or more
bowing line segments may occur along the southeastward-moving cold
front by Sunday evening, probably posing a risk for strong to
damaging winds. Decreasing instability due to the loss of diurnal
heating with eastward/southward extent should result in a gradual
reduction in severe potential by Sunday night.

..Gleason.. 11/03/2017

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Re: Tempo Severo EUA - 2017

Mensagempor Felipe F » domingo nov 05, 2017 10:38 am

Risco de tempo severo hoje principalmente em Indiana, Illinois e Ohio.
Potencial tornádico de 10%, 30% para granizo e 15% de vento.

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Re: Tempo Severo EUA - 2017

Mensagempor Felipe F » domingo nov 05, 2017 7:44 pm

Pelo menos 7 tornados reportados até o momento.
Danos foram reportados nos estados de Indiana e Ohio, alguns foram significativos.
Pelo menos duas pessoas ficaram feridas no estado de Ohio.

https://www.youtube.com/watch?v=DtOKY9E7gu4

https://www.youtube.com/watch?v=4d00dqWOfmg

https://www.youtube.com/watch?v=lZqZwODLAp8


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