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Yahoo
30-07-2025
- Climate
- Yahoo
Flash flood threat ahead of dramatic cooldown in the Northeast
While not all locations in the Northeast will experience torrential downpours and strong thunderstorms into Friday, areas that do may receive several inches of rain could have to deal with flash flooding, AccuWeather meteorologists warn. Noticeably cooler and less humid air is expected to arrive, offering relief to residents and visitors exhausted by recent heat. There is a significant amount of moisture in the atmosphere in the Northeast, and that has contributed to flash flooding through the summer, when it has been released in the form of torrential downpours. For parts of the Northeast, a one-two punch as an approaching cool front and a corresponding ripple in the jet stream will produce precipitation in the form of heavy rainfall into Friday and late this week to early next week in the Southeast. The first heavy rain and flash flood threat will be an eastward extension of downpours from the Midwest. This band of downpours is forecast to expand from northern Indiana and southern Michigan to northern Ohio, northwestern Pennsylvania and southwestern New York late Wednesday night to Thursday, before weakening and moving out of the region. At the same time, spotty severe thunderstorms are forecast for parts of the Northeast, but they will not be as widespread as previous severe weather episodes in prior weeks and more recently in the Central states. A flash flood risk will exist along a significant portion of the mid-Atlantic region to southern New England into Friday as the front and jet stream dip begin to join together. This joint effort will unleash a swath of heavy rain. The zone from eastern Pennsylvania, northeastern Maryland and northern Delaware to the lower Hudson Valley of New York, including New York City, Connecticut and parts of Massachusetts and Rhode Island is expected to receive 2-4 inches of rain and an AccuWeather Local StormMax™ of 8 inches. Rainfall of this intensity can easily overwhelm storm drains and flood city streets, subways and poor drainage areas along highways. Major travel disruptions are possible for both I-95 commutes on Thursday, as well as on Friday morning. It can also lead to rapid rises on small streams and a surge of water on rivers, posing risks to campers near creeks and low-lying areas. A greater concentration of severe thunderstorms packing strong wind gusts is foreseen on Friday from southeastern Pennsylvania and southern New Jersey to the Carolinas. As torrential downpours, flash flooding and severe thunderstorms focus on the southeastern corner of the U.S. this weekend, much cooler and less humid air will move into the Northeast, resulting in more comfortable air for many. Energy demands will ease, air conditioners can be turned off, and open windows in urban areas will let in cool air for a the app? Unlock AccuWeather Alerts™ with Premium+ High pressure from central Canada will take control of the weekend in the Northeast in what is usually the muggiest part of the summer. Typical highs range from the 80s to the low 90s, while nighttime lows range from the low 60s to the low 70s this time of the year. However, as the cool air takes root this weekend, daytime highs will range from the 60s in the mountains to the low 80s in many I-95, mid-Atlantic cities. Lows will mainly range from 40s in the mountains to the refreshing 60s in most I-95 cities. A few spots may even dip into the 30s over the coldest mountain spots during the weekend. With the much cooler air heading in, humidity levels will drop significantly, which has been relentless in coastal areas since early June. "The difference in pressure between the high building into the north and a developing area of storminess along the southern Atlantic coast will create a stiff breeze in some coastal areas of New England and the mid-Atlantic this weekend," AccuWeather Senior Meteorologist Dave Dombek warned. A steady or gusty northeast wind can stir up the surf and lead to a higher risk of rip currents. While astronomical tides are unremarkable this weekend, the persistent onshore breeze can push water levels to 1-2 feet above typical levels and may lead to minor flooding at times of high tide in low-lying areas. Next week, the effects of Canadian high pressure will slowly erode, but Monday and Tuesday should continue to provide cooler and more comfortable conditions for sleep, outdoor activities and general relief from recent humidity. 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
16-07-2025
- Climate
- Yahoo
Gulf tropical rainstorm to threaten Louisiana, including New Orleans, with flooding
The tropical development in the northern Gulf this week is expected to be limited due to its close proximity to land, but it will still pose a danger for the millions who reside across the region. AccuWeather meteorologists warn that the appropriately dubbed tropical rainstorm is destined to unload tremendous downpours that can unleash flooding on southern Louisiana, including the New Orleans metro area. "There is still time for the tropical rainstorm to evolve into an official tropical depression or tropical storm, but that time is limited," AccuWeather Lead Hurricane Expert Alex DaSilva said on Wednesday morning. "It probably has until the middle of the day on Thursday to do so." The rainstorm became disorganized while crossing the Florida Peninsula on Tuesday and Tuesday night. As of early Wednesday, the small swirl of winds was near Tallahassee, Florida, while the bulk of the showers and thunderstorms were located farther south over the warm waters of the Gulf. The more organized the rainstorm becomes, the greater the potential for excessive rainfall and widespread flooding along the central Gulf coast and especially southern Louisiana. But even a poorly organized tropical rainstorm can still produce localized torrential downpours that can lead to incidents of flash flooding. •Have the app? Unlock AccuWeather Alerts™ with Premium+ Weighing the "what ifs" and what is most likely, the AccuWeather RealImpact™ Scale for Hurricanes is a one, due to the potential for travel disruptions, loss of revenue and the risks to lives and property in the United States associated with heavy rainfall and flooding. Weak steering breezes will guide the rainstorm westward over southern Louisiana on Thursday. At that point, steering breezes may drop off, which could allow the rainstorm to stall and produce downpours over the same area. It is also possible that more of a northward or westward drift may continue. The former would allow some heavy rain to spread into more of the Mississippi Delta and lower valley region. The latter could allow downpours to spread westward and possibly reach close to Houston. A sizable zone where 4-8 inches of rain is forecast to fall extends across much of the southern half of Louisiana and part of southern Mississippi. Within this zone, pockets where 8-12 inches of rain can fall are anticipated with an AccuWeather Local StormMax™ rainfall of 16 inches. Rainfall rates of 1-3 inches per hour can occur during the storm, which is enough to challenge the storm drainage capabilities in some of the metro areas in southern Louisiana, including New Orleans. New Orleans sits below sea level and relies on powerful pumps to keep streets and neighborhoods free of standing water. Some flooding in low-lying areas is anticipated along with flash flooding in urban locations over portions of Louisiana, southwestern Mississippi and areas in Texas near the Louisiana border. From Friday to the weekend, drenching downpours are likely to expand over the lower and middle portions of the Mississippi Valley with pockets of flash flooding. Because of the minimal gain in strength anticipated by the tropical rainstorm, strong wing gusts will generally be limited to thunderstorm activity near the Interstate 10 corridor. "It is possible that a couple of tornadoes and waterspouts develop near the central Gulf coast as the storm moves inland on Thursday," DaSilva said. The track of the rainstorm may allow some water to be pushed shoreward over southeastern Louisiana and southern Mississippi. Because of the storm's low intensity, a storm surge of 1 to 3 feet is possible. AccuWeather meteorologists are watching the nearby waters of the United States for tropical development later this month in two zones. 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
13-05-2025
- Climate
- Yahoo
Rain to drench mid-Atlantic, central Appalachians, but struggle to reach all of New England
A storm that brought days of downpours and rounds of thunderstorms to the Southeast is heading northward, but not all areas of the Northeast will get soaked, AccuWeather meteorologists say. The southeastern United States storm produced rainfall ranging from 6 to 10 inches through Monday night, with some locations picking up between 10 and 14 inches of rain. While that magnitude of rain is not heading to the Northeast, a thorough soaking is coming to many areas, and some locations may experience heavy enough downpours to trigger flooding. Some heavy to locally severe thunderstorms can form over the lower part of the mid-Atlantic as well. The slow-moving storm will weaken as it lifts northward, but it will tap into some Atlantic moisture for the balance of the week. "In the Northeast states, the bulk of the rain is likely to fall on the mid-Atlantic region to parts of the central Appalachians into midweek," AccuWeather Chief On-Air Meteorologist Bernie Rayno said. A general 1-2 inches of rain is forecast to fall from the coastal areas of Virginia, Maryland and Delaware, westward to the Allegheny Mountains in West Virginia and central Pennsylvania. A swath of 2-4 inches of rain, with an AccuWeather Local StormMax™ rainfall of 6 inches, is anticipated from eastern North Carolina to parts of West Virginia's Eastern Panhandle. While the rain will be gentle and soaking in many cases and ideal for drought relief, an inch per hour rain can fall in some locations, which can overwhelm storm drains and lead to urban-style flooding. Where that rain falls on a more moist landscape, quick rises can occur on some small streams. However, aside from the isolated flash flood risk and the inconvenience the rain will cause for travel and outdoor plans, the rain is generally needed due to months of rainfall deficit. The rain will break up into more of a showery regime with embedded thunderstorms at midweek. As the steady rain winds down in the mid-Atlantic, showers and spotty thunderstorms will ramp up over the Midwest and New England Wednesday and Thursday. "Since humidity levels will be climbing as the storm progresses, it will not feel cool for too long, which is a bit different from most rainstorms thus far this spring," Rayno said. As the storm slowly breaks up in place over the Northeast from Wednesday to Thursday, the sun can break through here and there. Where the sun is out for a time, it may feel rather warm and humid, compared to most days this spring. Temperatures will trend upward for the remainder of the week from widespread highs in the 60s and mid-70s Tuesday to widespread 70s and 80s. The exception will be in eastern New England, where winds from the Atlantic and the chilly Labrador Current will cap highs in the the app? Unlock AccuWeather Alerts™ with Premium+ Very little rain is likely to reach northern New England from the storm, due to lingering dry air and the breakup of moisture over time. It is conceivable that parts of Vermont, New Hampshire and Maine may stay completely free of rain through at least Thursday. By Friday, there may be little evidence of the old Southern storm remaining. However, a storm that will snap a blistering northern Plains heat wave will advance from the Great Lakes to the Northeast from Friday to the weekend. That advancing storm will bring a renewed uptick in showers and thunderstorms. There may even be pockets of severe weather. The best chance for widespread rainfall in New England will come from that late-week and weekend storm. 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
08-05-2025
- Climate
- Yahoo
Needed southeast US rain could become too much, trigger flooding
A massive stalled storm will bring day after day of showers and thunderstorms to parts of the southeastern United States through the Mother's Day weekend. AccuWeather meteorologists say that while rain is needed in some areas, too much may fall and lead to flooding problems. Rainfall from the winter to the first part of the spring has been lean in parts of the region, to say the least. In some locations, drought conditions have escalated to severe or worse. The dry conditions have resulted in much more than brown lawns and is on the verge of impacting crops in the region by adding stress and stunting growth. While the southeastern U.S. is well known for crops such as peanuts, tobacco and cotton, it is also a source for summer vegetables, grains and tree and bush fruits. Rainfall at a critical time in the spring and early summer is essential for the plants to grow, fill out and produce a significant amount of produce. Rainfall from the long-lasting storm will have vast positive impacts on soil moisture and filling some streams, ponds and reservoirs in the region, especially from northern Florida to the Carolinas. Some of the negatives from the slow-moving, drenching storm system are fairly obvious and may lead to alterations to outdoor plans and slow travel heading into and throughout the Mother's Day weekend. A much more significant negative impact may unfold and this can occur anytime there are days of the app? Unlock AccuWeather Alerts™ with Premium+ AccuWeather meteorologists expect a broad zone where 1-4 inches of rain will fall. While that amount spread over multiple days is not extreme, rainfall in some locations can be double and nearly triple that amount. The AccuWeather Local StormMax™ rainfall for the storm through Tuesday is 10 inches. Streams and rivers in the region that may have been running low will fill with water. Low-lying unprotected flatlands along some of the rivers may flood. Meanwhile, the same storm system will create an onshore wind from the Atlantic that will push water toward the coast and result in levels above the astronomical tide. The combination of the onshore winds and proximity to the astronomical effects of the full moon early next week can lead to coastal flooding. The flooding will be the most significant at times of high tide. Any surge of water coming in to meet the tidal surge can also add to the flooding. This potentially may include cities such as Charleston, South Carolina, and Savannah, Georgia. 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
04-04-2025
- Climate
- Yahoo
Central US: Catastrophic, life-threatening flash flooding to be followed by major river flooding
Additional rounds of torrential rain will continue to trigger widespread, life-threatening and catastrophic flash flooding centered on the mid-Mississippi and Ohio valleys into Saturday night, AccuWeather meteorologists warn. In the next few weeks, runoff from the extreme rainfall will result in moderate to major flooding on the secondary and largest rivers in the region. As of Friday, some locations in Tennessee and Kentucky were approaching double-digit rainfall from an event that was only about halfway complete. Some locations in the mid-Mississippi and Ohio valleys will be on the receiving end of two more rounds of heavy rain with perhaps the most intense coming from Saturday to Saturday night. The rainfall has already caused scores of flash flood warnings, with runoff inundating some neighborhoods. Many small streams have overflowed banks or soon will at a rapid pace, adding to the danger of severe thunderstorms, some packing tornadoes. Similar to what happened with Helene in the southern Appalachians, roads and bridges along small streams may be washed away, and small streams can become raging torrents of high water that put lives in peril and wash away homes and the app? Unlock AccuWeather Alerts™ with Premium+ In some cases, the rate of rain has overwhelmed, and will continue to overwhelm, storm drainage capabilities. When done, this could end up being a once-in-a-500- to 1,000-year rain event. Because of the scope of rainfall projected, AccuWeather meteorologists have issued a rare catastrophic flood impact and a massive zone of extreme flood impact. Such a situation has not unfolded since Helene. When the repeating rounds of rain finally finish later this weekend, a broad area will exist where 8-16 inches of rain has fallen, with local amounts to as high as 20 inches. The AccuWeather Local StormMax™ rainfall for the event spanning Wednesday to Saturday night is 21 inches. The final amount of rain projected is equivalent to two to four month's worth of rain in the region. Rain has not fallen evenly across the region, due in part to the orientation of the atmospheric river, or the plume of moisture-rich air originating from the Caribbean and Gulf. However, a more progressive and widespread round of intense rain is forecast from Saturday to Saturday night. This will occur as the caboose in the train of moisture-rich storms moves along. In some cases, from late Saturday to Saturday night, multiple hours of extreme rain and life-threatening flash flooding may follow the terror of severe thunderstorms with tornadoes from the mid-Mississippi Valley to portions of the Ohio and Tennessee valleys. Even long after the rain ends in the region from later Sunday on, all the water that gathered in urban areas and small streams will continue to flow and surge into progressively larger rivers in the region. Flooding on the secondary rivers will be followed by flooding along the largest rivers in the region--the Ohio and lower Mississippi. Moderate to major flooding is forecast along these massive waterways. Some major roads and highways could be underwater for an extended period. Because water takes many days and weeks to reach a crest then drop below flood stage, some unprotected areas along the Ohio and Mississippi could be underwater for a long period of time. This means that, in some cases, farmland could be inundated or too muddy to access well into the growing season. The northern cutoff for the high water on the Mississippi is just below St. Louis, as the heaviest rain has and will continue to stay to the south of the major port on the river. However, heavy rain has fallen on the Merrimec River basin just south of St. Louis and is leading to significant flooding. It may take two to three weeks for the surge of water to cycle to the Mississippi Delta region, including the Atchafalaya flood control zone and later New Orleans. The high and fast-moving water will negatively affect tug and barge operations on the Ohio and lower Mississippi rivers. Due to high water, the tugs will not be able to pull as many barges or may not be able to reach some ports. As the caboose storm picks up forward speed late Saturday night and Sunday, it will spread much-needed rain to drought and wildfire-ravaged areas of the southern Appalachians and the Carolinas. While the rate of rain can be heavy in these areas with highly localized flash and urban flooding, the widespread problems over the mid-Mississippi basin should not be repeated. However, there will be severe weather from Sunday to Monday in the Southeast states. The severe weather risk includes the potential for a few tornadoes. 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.
