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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
11-07-2025
- Climate
- Yahoo
Wildfire smoke may follow storms, severe weather in eastern US
An active pattern for thunderstorms will continue across portions of the Eastern United States, producing damaging wind gusts and flooding, AccuWeather meteorologists say. The combination of lingering moisture and daytime heating will allow spotty thunderstorms to develop over the East on Saturday. A front approaching from the West will promote more widespread thunderstorms and the risk of severe weather across the region on Sunday and into the start of the new week. Thunderstorms that develop can be slow-moving in nature, unloading immense rainfall and raising the risk of flooding. "One issue with storms in the summertime is when they erupt, they can grow skyward and move very slowly at the same time--just like they do in tropical rainforests or jungles. This has the potential to unload a tremendous amount of rain," said AccuWeather Senior Meteorologist Alex the app? Unlock AccuWeather Alerts™ with Premium+ Individuals from the Carolinas to New England are urged to monitor the weather over the coming days and have many ways to receive warnings and be aware of the quickest means to get to safety. Severe risk to focus across the East As the front slowly makes its way across the East, it will interact with warm, moist air, promoting the risk of severe thunderstorms both on Sunday and Monday. The zone where severe thunderstorms are expected on Sunday will stretch from far eastern Oklahoma into western New York. Hazards, including hail, localized damaging wind gusts and flooding, can occur in any thunderstorm. Those traveling on the road or in the air, including along interstates 40, 80 and 81, will need to prepare for potential delays due to thunderstorms. By Monday, the risk will shift east, focusing on the area from North Carolina into far western Maine. Localized damaging wind gusts up to 60 miles per hour and flooding will again be the main hazards of concern. Thunderstorms are expected to impact portions of the I-95 corridor, including Washington, D.C., Philadelphia and New York City during the evening commute, which can slow travel. Smoke slated to return to the East next week Smoke from ongoing Canadian wildfires in Saskatchewan and Manitoba will be ushered into the Midwest and Great Lakes regions through the weekend, causing a hazy sky and air quality alerts in the thickest smoke. The same front that will spark severe thunderstorms into early week will steer the smoke farther east into portions of the Northeast by the beginning of the week. The thickest smoke is expected to be concentrated from upstate New York through western Maine and into parts of Canada, including Ottawa and Montreal. In this zone, air quality can be reduced, resulting in potentially hazardous conditions for susceptible populations such as the elderly and those with respiratory ailments. Individuals are encouraged to avoid spending large amounts of time outside and take breaks often. Haze can be noticeable in the sky elsewhere across the Northeast, reaching as far south as Philadelphia and Baltimore. Smoke in the atmosphere can enhance sunrises and sunsets, providing more vibrant colors. AccuWeather Forecast Intern Julia Angerman contributed content to this article.
Yahoo
10-07-2025
- Climate
- Yahoo
Rounds of severe storms to rattle, drench central US
Thunderstorms will erupt on the eastern side of a heat dome anchored over the western United States through the weekend. Some communities will be rattled by severe weather or drenched by downpours on multiple days, Accuweather meteorologists say. The most far-reaching impacts from the storms will be torrential downpours that can slow travel and gusty winds that can break tree limbs and lead to sporadic power outages. However, some of the storms will take severe weather to another level. Into Thursday night, thunderstorms will congregate from the eastern part of the Dakotas, southward to the panhandles of Texas and Oklahoma. Some of the storms in this zone can produce significant hail and a couple of tornadoes. A complex of storms may organize and push as far east as portions of Iowa and northwestern Missouri. Omaha, Nebraska, will be one of the largest metro areas affected by the storms into Thursday night. On Friday, the severe weather threat will continue over portions of the High Plains of Colorado, Nebraska, Kansas, New Mexico and the Texas and Oklahoma panhandles. A more concentrated zone of thunderstorms is forecast on Friday from southwestern Wisconsin and northwestern Illinois to northeastern Kansas and southeastern Nebraska with southeastern Iowa and northern Missouri smack in the middle. The full spectrum of severe weather can occur with the setup on Friday ranging from high winds and hail to flash flooding and a couple of tonradoes. Once again, Omaha will be close to some of the most intense thunderstorms, but also the metro areas of Kansas City, Missouri, and Des Moines and Davenport, Iowa, will be affected. On Saturday, the risk of severe weather will advance more to the east and south over the Central states. During part of Saturday afternoon to Saturday night, thunderstorms capable of producing high winds, hail and flash flooding will extend from eastern Wisconsin and Michigan to Oklahoma and northern Texas. Those with flights to or from Chicago, Detroit, St. Louis and possibly Dallas could experience delays as storms approach. •Have the app? Unlock AccuWeather Alerts™ with Premium+ On Sunday, the severe weather risk with flooding downpours will push into the eastern Great Lakes, Appalachians and the Tennessee Valley. However, the potential for severe weather will linger over portions of northern Texas and eastern Oklahoma. Flash flooding, localized strong wind gusts and hail will be a concern for portions of north-central and northwestern Texas to New Mexico on Sunday. The cites of Buffalo, New York, Cleveland, Pittsburgh, Nashville and Little Rock, Arkansas, could be faced with severe weather for a time. 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
08-07-2025
- Climate
- Yahoo
New topical threat may emerge near Southeast coast by mid-July
In a pattern similar to early July, an area along the southeastern coast of the United States is the zone being watched closely by AccuWeather meteorologists for the next round of tropical development in the Atlantic basin. Tropical depressions and storms tend to form close to Central America, the Caribbean and the waters adjacent to the southern U.S. early in the hurricane season. The area that gave birth to Chantal has been under close scrutiny by AccuWeather since the middle of June. The third tropical depression of the 2025 Atlantic hurricane season formed late on Independence Day afternoon, then went on to become Tropical Storm Chantal the next week. Chantal formed in response to a stalled front and a weak dip in the jet stream. Chantal moved inland earlier in the week and brought flooding rain to parts of the Carolinas. While conditions are likely to remain quiet in the tropical Atlantic for the next few days, the same zone along the southern Atlantic coast has a low chance of brewing another tropical depression or storm spanning July 14-17. Similar to what meteorologists were monitoring prior to Chantal's formation, development could take place over the northeastern Gulf instead. For the setup in mid-July, the front is weaker and the jet stream dip is not as pronounced as that of around Independence Day. However, wind shear (disruptive winds) may be a bit lighter compared to earlier in the month. Balancing the concerns out, there is a low chance of development. Should development take place on the Atlantic side of Florida, it may once again drift northward toward the U.S. coast. Should development occur on the Gulf side of Florida, steering breezes could guide the area of interest westward along the northern Gulf coast. •Have the app? Unlock AccuWeather Alerts™ with Premium+ In either case, showers and thunderstorms can increase in coastal areas and adjacent waters offshore even if a storm center fails to form. Should a center form, more substantial rain and wind, with building surf, would unfold. The next name on the list of tropical storms for the 2025 season is Dexter. Conditions remain too hostile for tropical development farther to the south from the western shores of Africa through the Caribbean through at least the middle of July. Vast areas of dry air, dust from the Sahara Desert and disruptive winds are the main factors against development. The 2025 Atlantic hurricane season is about one month ahead of the historical average, with three named storms already forming. Typically, the third tropical storm does not form until early August, or about a month after Chantal formed. The average date for the first hurricane is Aug. 11, and the first major (Category 3) hurricane generally forms around the start of September. AccuWeather's team of tropical meteorologists, led by hurricane expert Alex DaSilva, expects 13 to 18 tropical storms, of which seven to 10 will go on to become hurricanes and three to five are likely to evolve into major hurricanes for the 2025 season. 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.
