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Yahoo
a day ago
- Climate
- Yahoo
Severe storms, torrential downpours to erupt in eastern, central US ahead of July 4th holiday
Thunderstorms will erupt as the decaying heat dome gives way, feeding on the lingering hot and humid air across parts of the central and eastern United States. These storms are likely to cluster near advancing cool air boundaries. Some of these storms will be severe and/or bring flooding downpours, AccuWeather meteorologists warn. A prime area for both severe thunderstorms packing strong wind gusts and torrential downpours that can trigger dangerous flash flooding will stretch from parts of the central Appalachians to southern Virginia and westward into parts of the Ohio Valley. "A wedge of cooler air has settled over the Northeast but stalled across parts of the central Appalachians, creating a focal point for downpours and potentially severe storms." Some of the same areas in West Virginia, Virginia, Maryland and Pennsylvania that experienced flash flooding in the past couple of weeks will be at risk for flooding again due to the incredible amount of moisture in the atmosphere that will be squeezed out like a sponge. Intense downburst winds and small hail can accompany some of the storms into the early evening. Heavy rainfall can occur at any time through Friday night, before being renewed on Saturday. Rainfall rates in the most extreme cases can exceed 2 inches per hour, which is more than enough to turn drainage culverts, city streets and small streams into raging torrents. A storm and trailing cool front will slice across the Great Lakes through Friday night, before reaching the Northeast on the app? Unlock AccuWeather Alerts™ with Premium+ As the front advances, it will become a new focusing point for locally severe thunderstorms in the Appalachians and parts of the Atlantic coast. Flooding downpours and strong, localized wind gusts will pose the main threats to travelers and those spending time outdoors. A couple of the strongest storms on Saturday afternoon could spawn brief tornadoes. Perhaps the most likely spot for that will be over New York's Hudson Valley. Farther northwest, a new storm and front will gather moisture and momentum over the northern Plains on Friday then the Great Lakes region and part of the central Plains on Saturday. From high winds and damaging hail to flash flooding and powerful wind gusts, all modes of severe weather will be possible with storms into Saturday. The AccuWeather Local StormMax™ wind gust for Friday evening is 90 mph but will increase to 95 mph on Saturday, as the intensity of the storms is likely to peak later in the day and evening as the storms move into central and southwestern Minnesota. Later in the weekend, heavy and gusty to locally severe thunderstorms will tend to press southeastward and extend from Wisconsin to the High Plains of Colorado, Wyoming and northeastern New Mexico. In the zone from southwestern Wisconsin to northeastern Kansas and southeastern Nebraska, a greater concentration of severe weather is likely, with some storms capable of producing damaging hail, a few tornadoes and powerful wind gusts. Aside from the various pockets of severe weather this weekend, storms in parts of the middle Mississippi Valley and Florida can be especially drenching with locally gusty winds as well. In contrast, much of the West and the southern Plains will tend to be free of rain. The same storm and trailing front over the central Plains and western Great Lakes will push to the south and east on Monday. The major Midwest hubs of Chicago, Detroit, St. Louis and Indianapolis are likely to be dealing with severe weather at some point on Monday afternoon and evening. The same setup may advance into parts of the Northeast and southern Appalachians on Tuesday. Want next-level safety, ad-free? Unlock advanced, hyperlocal severe weather alerts when you subscribe to Premium+ on the AccuWeather app. AccuWeather Alerts™ are prompted by our expert meteorologists who monitor and analyze dangerous weather risks 24/7 to keep you and your family safer.
Yahoo
4 days ago
- Climate
- Yahoo
Surge in downpours, thunderstorms coming to southeast US
Soon after the heat peaks over the interior Southeast, the pattern will transition into one that favors an increase in showers and thunderstorms into early July, AccuWeather meteorologists say. There's even a remote possibility for tropical activity near the Gulf and Atlantic coasts. A blistering heat dome that has been building since late last week from the middle of the nation to the mid-Atlantic coast was at its peak Tuesday and will gradually weaken through the end of the week. Prior to a complete collapse of the heat dome, the heat will build into Thursday over parts of the Southeast. Shortly after, the typical summertime pattern of spotty afternoon and evening thunderstorm activity will come into play. The thunderous escalation won't stop there. A very slight dip in the jet stream is forecast to gradually form over the Southeastern states. As this occurs, it will harvest some moisture from the Gulf and subtropical Atlantic through the end of the month. These pulses of moisture will lead to groups of showers and thunderstorms that could be well beyond the pop-up afternoon summertime thunderstorm activity the Southern states are known for. Where the downpours tend to linger for a day or repeat over multiple days, there will be a greater potential for more widespread flash flooding, other than the typical localized the app? Unlock AccuWeather Alerts™ with Premium+ Sometimes, when a summertime dip in the jet stream lingers near the Gulf or the southwest Atlantic, it can lead to gradual tropical development. While that is far from a guarantee in this case, it is something AccuWeather meteorologists will be watching for over the central and eastern Gulf coasts, as well as the southern Atlantic coasts. First, an area of low pressure would have to form over the warm water or right along the coast. Next, it would have to linger long enough to begin producing gusty winds and a defined circulation. Should that happen, a tropical depression could be born. There is no low pressure area, and the jet stream dip has yet to form. However, confidence in the latter with increasingly persistent downpours and gusty thunderstorms is much greater and would have to occur first. Even without any tropical development into early July in this area, rough conditions can develop on the beaches with the possibility of a few waterspouts for boaters to look out for, including around the Fourth of July holiday. Where clouds develop and persist in the region, those areas will tend to have somewhat lower high temperatures, but the nights can remain especially muggy. As much of the Southeast experiences the uptick in shower and thunderstorm activity into the end of June, a high pressure off the Atlantic coast may exert enough influence to hold back rainfall for much of the Carolinas. With more sunshine compared to the rest of the Southeast, the Carolinas may stay rather hot for an extended period before that sunny pocket breaks down toward July. Want next-level safety, ad-free? Unlock advanced, hyperlocal severe weather alerts when you subscribe to Premium+ on the AccuWeather app. AccuWeather Alerts™ are prompted by our expert meteorologists who monitor and analyze dangerous weather risks 24/7 to keep you and your family safer.
Yahoo
4 days ago
- Climate
- Yahoo
Heat dome to break down as downpours and thunderstorms erupt
The clock is ticking on the extremely high temperatures from the Midwest to the Northeast, and as the heat dome weakens during the second half of this week, thunderstorms will erupt in areas where humidity levels remain high, AccuWeather meteorologists advise. In some cases in the Northeast, the cooldown can be dramatic. Millions recently hoped for relief from the relentless downpours and abnormally cool conditions and they got their wish with a virtually cloudless sky and searing summer heat. Now, millions are seeking some relief from the sudden surge of extreme heat and blazing sunshine, or at least a break from the extreme temperatures. Temperatures will throttle back as showers, thunderstorms return In many cases, where high temperatures were within a few degrees of 100 F into Tuesday, highs closer to 90 will be in store later in the week, with some spots experiencing highs in the 80s. Where highs were in the middle to upper 90s during the first few days of the week, highs in the 80s will be more common by week's end, with some places getting a day or two with highs in the 70s. "There's even a rare backdoor cool front that will drop southward from New England to part of the mid-Atlantic region during the middle and latter part of this week," AccuWeather Senior Meteorologist Brett Anderson said, "This can dramatically drop temperatures by 20-40 degrees in some cases, which is about as big as it gets this time of the year." For example, in Boston, following highs near 100 in Boston Tuesday, temperatures may be no higher than the 60s Thursday and Friday behind the front. It will likely be a similar story in New York City, highs around the century mark Tuesday will be followed by highs in the 70s Thursday and the app? Unlock AccuWeather Alerts™ with Premium+ For those fearing more weather whiplash, the return of thunder and downpours should be less extreme than before, in most cases. This is not to say that flash flooding will be absent everywhere, as that risk tends to accompany summertime thunderstorms. The massive heat dome will slowly shrink and weaken At first, the extreme heat will settle southward, but the mechanisms for producing the extreme temperatures will gradually disappear, allowing more typical summertime heat to take over. As the heat dome weakens, thunderstorms will have an easier time erupting throughout the central and eastern United States. The boundary of the heat dome will shrink from the north and west, and the fringe zones will likely experience more cloud cover and more frequent shower and thunderstorm activity compared to the rest of the decaying heat dome. This also means that some of the areas on the rim of the heat dome that were getting clobbered by daily storms should get a break from the downpours and severe weather. Want next-level safety, ad-free? Unlock advanced, hyperlocal severe weather alerts when you subscribe to Premium+ on the AccuWeather app. AccuWeather Alerts™ are prompted by our expert meteorologists who monitor and analyze dangerous weather risks 24/7 to keep you and your family safer.
Yahoo
5 days ago
- Climate
- Yahoo
'Ring of fire' thunderstorms to ride rim massive heat dome this week
A swath of thunderstorms, sometimes thousands of miles long, often goes along with huge heat domes across the United States during the summer. The weather pattern this week will be no exception, AccuWeather meteorologists say. Because the air in much of the heat dome is warm through most layers of the atmosphere, clouds have difficulty forming, let alone thunderstorms. However, on the edges of the heat, especially along the northern and western flanks thereof, the air is cooler well above the ground, which makes it easier for clouds to tower and produce thunderstorms. The pattern is referred to in the weather community as a "ring of fire," as thunderstorms tend to form along the edges of the heat dome. Within this ring, there can be spotty, individual thunderstorms, large clusters of thunderstorms or a solid line of storms that can repeat or meander back and forth as hot and cool air change hands. During the afternoon and evening, when thunderstorms tend to be most active, towering clouds, downpours, thunder and lightning will extend from north-central Mexico to southeastern Canada and New England, an arc about 2,200 miles long. If a location is within the thunder zone one day, it could remain in the same zone all week or possibly catch a break one day, only to be stormy the next consecutive days. Where the storms repeat, there will be a heightened risk of flash flooding. Any thunderstorm in the highlighted zones can pulse to severe intensity with high winds, frequent lightning strikes, hail and perhaps a brief tornado. •Have the app? Unlock AccuWeather Alerts™ with Premium+ A swath of thunderstorms, some locally severe, will extend from northeastern New Mexico and the Texas Panhandle to northern Michigan into Monday night. Much of the Northeast will catch one of those breaks from thunderstorm activity into Monday night but not so for Tuesday as the thunder regime resumes. More storms will target hard-hit areas of central and eastern upstate New York, as well as northern New England, western New York, northwestern Pennsylvania, northern Ohio, northern Indiana, southern Michigan and vast populated areas of southeastern Ontario and southern Quebec. Tuesday will be another active day in terms of severe weather for the Plains states as well. Most of the severe thunderstorms will focus from the eastern halves of Colorado and Wyoming to northern Illinois and southern Wisconsin. More storms will erupt in both the Plains and Northeast states at midweek. Some severe thunderstorm activity will extend from the High Plains of Colorado, Wyoming and Montana to southern Michigan, northern Indiana and northern Ohio. The severe weather threat will extend into the Northeast on the northern fringe of the heat dome as well on Wednesday. Picking up from northern Ohio and southern Michigan, the threat of locally severe thunderstorms will extend eastward through central and northern Pennsylvania and the southern tier of New York to northern New Jersey and southern New England. Locally severe thunderstorms will continue in parts of the Midwest on Thursday. Pockets of severe weather are likely to continue over the Plains, Midwest and the Northeast until the heat dome breaks down. As the heat dome collapses, there will be the potential for a large zone of thunderstorms that progresses from east to west or from north to south late in the week and over the weekend. Some of that thunderstorm activity is likely to be severe as is often the case, as a heat wave breaks down. There will be thunderstorm activity on the southern edge of the heat dome as well. The trade winds will be enhanced by the east-to-west breeze created by the high pressure area, associated with the heat dome, especially over the Florida Peninsula. While this pattern is often present during the summer, thunderstorms can be a bit stronger given that they are on the edge of the heat dome. Most of the thunderstorms will tend to erupt just inland of the Florida Atlantic beaches and push westward across the Peninsula as the day progresses. By the time they reach the Gulf coast, they can be locally severe. Want next-level safety, ad-free? Unlock advanced, hyperlocal severe weather alerts when you subscribe to Premium+ on the AccuWeather app. AccuWeather Alerts™ are prompted by our expert meteorologists who monitor and analyze dangerous weather risks 24/7 to keep you and your family safer.
Yahoo
16-06-2025
- Climate
- Yahoo
Eastern Pacific tropical rainstorm may rapidly strengthen, threaten Mexico
The eastern Pacific continues its tropical tear with already the fourth tropical storm of the season in the books and the fifth on the way. The latest tropical rainstorm has the potential to rapidly intensify and may threaten the coast of Mexico as a potent hurricane at landfall. Close on the heels of Dalila, a poorly organized tropical rainstorm just off the coast of Mexico is forecast by AccuWeather meteorologists to become the next tropical depression and tropical storm of the 2025 eastern Pacific hurricane season. With four tropical storms and one hurricane already history for the basin, this season is well ahead of the historical average pace. Typically, the fourth tropical storm does not form until mid-July, and the average date for the first hurricane is not until June 26. Barbara briefly strengthened to a hurricane back on Sunday, June 8. "We expect the latest tropical rainstorm off the southern coast of Mexico and the western coast of Central America to slowly drift north-northwestward and gradually organize into midweek," AccuWeather Lead Hurricane Expert Alex DaSilva said, "Sometime on Tuesday or Wednesday, we should have a tropical depression or perhaps Tropical Storm Erick." That official call is made by the National Hurricane Center and will be based on wind and pressure data the app? Unlock AccuWeather Alerts™ with Premium+ "There is a chance that if this tropical rainstorm can organize quickly enough, it could then rapidly strengthen from a tropical storm to a powerful hurricane," DaSilva said, "That rapid intensification process could occur just hours prior to making landfall along the southwestern coast of Mexico sometime late Wednesday night to Thursday morning." Factoring in the possibilities of intensity, track, topography and population, the AccuWeather RealImpact™ Scale for Hurricanes with the current rainstorm is a 1. Barbara peaked last week as an entry-level Category 1 hurricane while well offshore with maximum sustained winds of 75 mph. This new storm could easily eclipse that intensity as it approaches the coast and populated areas. How much rain and wind occur to the north and east of the center will depend on the amount of strengthening prior to landfall later this week. Both heavy rain and gusty winds will reach Mexico in advance of the center of the storm. Enough rain is likely to fall in parts of southern and southwestern Mexico along the coast and over the interior mountains to cause dangerous flash flooding and mudslides. Strong winds will buffet the coast generating large swells, big waves, overwash on the beaches and shoreline and dangerous rip currents in the surf zone. AccuWeather meteorologists expect 14-18 tropical storms for the eastern Pacific season with seven to 10 to become hurricanes. Of these, from three to six will bring direct impacts to Mexico and Central America. In the wake of the fifth tropical storm this week, there may be a brief lull in activity over the eastern Pacific. Tropical Atlantic continues to sleep Meanwhile, the tropical Atlantic basin continues to struggle with vast areas of dry air, dust and disruptive winds-all of which are not uncommon tropical development deterrents early in the season. "While the chances have become very small, we continue to watch the area close in to land in the southwestern Gulf and the western Caribbean for tropical development late in June," DaSilva said. There have been some showers and thunderstorms in this area in recent days, but no organization has occurred. "Any tropical rainstorm or depression that were to form in the area would likely not spend much time over warm water and, hence, its lifespan would be brief," DaSilva said. Want next-level safety, ad-free? Unlock advanced, hyperlocal severe weather alerts when you subscribe to Premium+ on the AccuWeather app. AccuWeather Alerts™ are prompted by our expert meteorologists who monitor and analyze dangerous weather risks 24/7 to keep you and your family safer.
