Tavares Posted June 12, 2017 at 08:36 PM Share Posted June 12, 2017 at 08:36 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 SITUAÇÃO PARTICULARMENTE PERIGOSA para a ocorrência de tornados está em vigor para o sudeste do Wyoming, Norte do Colorado e o Panhandle de Nebranka Link to comment Share on other sites More sharing options...
Felipe F Posted August 17, 2017 at 03:05 PM Share Posted August 17, 2017 at 03:05 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. [bbvideo=560,315] [/bbvideo] [bbvideo=560,315] [/bbvideo] [bbvideo=560,315] [/bbvideo] Link to comment Share on other sites More sharing options...
André Luiz DS Posted August 21, 2017 at 03:25 PM Share Posted August 21, 2017 at 03:25 PM Intensas tempestades estão percorrendo a região centro-sul da Dakota do Sul neste momento: Link to comment Share on other sites More sharing options...
Felipe F Posted August 31, 2017 at 11:44 PM Share Posted August 31, 2017 at 11:44 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. Link to comment Share on other sites More sharing options...
Felipe F Posted September 1, 2017 at 04:07 PM Share Posted September 1, 2017 at 04:07 PM Mais tornados são esperados hoje devido ao ciclone Harvey. Os tornados estão previstos para ocorrer na região das Carolinas. Alabama ontem: [bbvideo=560,315] [/bbvideo] [bbvideo=560,315] [/bbvideo] Link to comment Share on other sites More sharing options...
Felipe F Posted September 17, 2017 at 06:26 PM Share Posted September 17, 2017 at 06:26 PM 37 tornados confirmados durante o furacão Harvey. O mais forte foi classificado com EF2. Link to comment Share on other sites More sharing options...
Tavares Posted October 20, 2017 at 03:43 PM Share Posted October 20, 2017 at 03:43 PM Risco de grau 3 (enhanced) pra Oklahoma amanhã 21/10. ...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 Link to comment Share on other sites More sharing options...
Felipe F Posted October 22, 2017 at 12:17 AM Share Posted October 22, 2017 at 12:17 AM Granizo e ventos fortes foram reportados no TX, OK e KS. Pelo menos dois tornados reportados em OK, um em andamento neste momento. Link to comment Share on other sites More sharing options...
Felipe F Posted October 22, 2017 at 02:52 AM Share Posted October 22, 2017 at 02:52 AM Fracos e breves tornados sendo reportados hoje em Oklahoma. Um tornado atingiu Norman, OK causando alguns danos. [bbvideo=560,315] [/bbvideo] Link to comment Share on other sites More sharing options...
Felipe F Posted October 22, 2017 at 03:08 AM Share Posted October 22, 2017 at 03:08 AM Dano próximo de Norman, OK. Link to comment Share on other sites More sharing options...
Felipe F Posted November 3, 2017 at 01:35 PM Share Posted November 3, 2017 at 01:35 PM 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. 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 Link to comment Share on other sites More sharing options...
Felipe F Posted November 5, 2017 at 12:38 PM Share Posted November 5, 2017 at 12:38 PM Risco de tempo severo hoje principalmente em Indiana, Illinois e Ohio. Potencial tornádico de 10%, 30% para granizo e 15% de vento. Link to comment Share on other sites More sharing options...
Felipe F Posted November 5, 2017 at 09:44 PM Share Posted November 5, 2017 at 09:44 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. [bbvideo=560,315] [/bbvideo] [bbvideo=560,315] [/bbvideo] [bbvideo=560,315] [/bbvideo] Link to comment Share on other sites More sharing options...
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