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Hurricane Hunters Identify Four Warning Signs for Tropical Cyclone Intensification

Researchers, utilizing nearly three decades of data from NOAA Hurricane Hunter aircraft, have identified four key features that indicate when a tilted tropical cyclone is likely to become vertically aligned and intensify. Tropical cyclones typically need to achieve vertical organization, where their rotating centers at different atmospheric levels align, before they can significantly strengthen. The study, led by Michael S. Fischer from the University of Miami Rosenstiel School, found that successful alignment depends on a combination of the storm's internal structure, the direction of surrounding winds, and environmental conditions. The four identified signs are: a compact, tightly organized circulation near the ocean surface; a storm tilt favorably positioned relative to vertical wind shear; stronger rising air and heavier rainfall near the storm's lower-level center; and an environment with warm ocean water, ample atmospheric moisture, and weak middle-level winds. This research aims to provide forecaste...

El Niño May Bring Surprising Snowfall to the U.S. This Winter

El Niño, a climate phenomenon characterized by warmer-than-average sea surface temperatures in the Pacific Ocean, is expected to influence weather patterns across the United States this winter (CNN, 2026-09-17). While warmer temperatures are often associated with El Niño, this does not necessarily mean a snow-free winter. In fact, El Niño can lead to unexpected snowfall and even blizzards in certain regions. The phenomenon is also contributing to increased tropical activity in the Pacific, with a cluster of three hurricanes currently forming in the central and eastern parts of the ocean. These developments highlight the complex and far-reaching impacts of El Niño on global weather patterns.

Kelvin Waves Explained: El Niño’s Hidden Ocean Pulse

Kelvin waves are massive pulses of ocean or atmospheric energy that travel thousands of miles across the equatorial Pacific. A warm, downwelling Kelvin wave can move subsurface heat eastward, deepen the thermocline and help strengthen El Niño, although one wave does not guarantee an El Niño event. The current wave is forecast to reach California in late September and move toward San Francisco by early October, potentially raising coastal water levels by about 1 foot. That temporary rise could worsen flooding and erosion if it coincides with high tides, large surf or a coastal storm.

Polar Vortex and Super El Niño May Disrupt Winter 2026-2027

Meteorologists are closely monitoring the development of the polar vortex and a strong El Niño ahead of winter 2026-2027. The polar vortex, a large area of low pressure and cold air over the North Pole, is forming stronger than usual for this time of year. Long-range forecasts suggest a potential weakening of the vortex around mid-winter, which could lead to significant atmospheric disruptions. Concurrently, a 'Super El Niño' is strengthening in the tropical Pacific, with NOAA predicting a greater than 90% chance of it reaching very strong levels during the Northern Hemisphere autumn and winter. This combination of factors could reshape the jet stream, alter storm tracks, and influence temperature patterns across the United States and Europe. However, forecasters emphasize that it is too early to confirm whether a major polar vortex disruption or sudden stratospheric warming event will occur.

El Niño's Impact on US Snowfall This Winter

The United States is preparing for potential changes in snowfall patterns this winter due to the influence of a strong El Niño event. El Niño, a climate phenomenon characterized by warmer-than-average sea surface temperatures in the Pacific Ocean, can significantly alter weather patterns across the globe. According to CNN, this year's El Niño is being described as one of the strongest on record, which could lead to unexpected snowfall variations in different regions of the U.S. While some areas may experience heavier snowfall, others could see reduced snow accumulation. The phenomenon is also contributing to increased tropical activity in the Pacific, with a cluster of three hurricanes currently forming in the central and eastern parts of the ocean. These developments highlight the far-reaching impacts of El Niño on global weather systems. (Source time: Thu, 17 Sep 2026 17:57:00 GMT)

Polar Vortex and Super El Niño to Shape US Winter

A strong El Niño event is expected to interact with the polar vortex this winter, potentially influencing weather patterns across the United States. According to the National Oceanic and Atmospheric Administration's Climate Prediction Center (CPC), there is a greater than 90% chance of a very strong El Niño event during the fall and winter months, with a 75% likelihood of it being one of the strongest on record since 1950. The polar vortex, a large area of cold air and low pressure around the Earth's poles, typically strengthens in winter and can send Arctic air southward. While a strong polar vortex often leads to warmer-than-average temperatures in the Northern Hemisphere, disruptions can still cause cold air outbreaks in the U.S. (Source time: not specified).

Super El Niño May Trigger Severe Spring Weather in 2027

The ongoing Super El Niño, which could become the strongest in modern history, is expected to significantly influence global weather patterns through 2027 (source: hailtrace, 2026-09-16). Sea surface temperatures are climbing, creating an unstable atmospheric environment that may lead to an active storm season in spring 2027. Meteorologists predict that as the El Niño fades early next year, the shift in oceanic and atmospheric conditions could fuel severe weather events, including thunderstorms and possibly tornadoes, during the March-May 2027 period.

Aviation Weather Highlights Winter Hazards

The Aviation Weather Center has released updated observations and forecasts for winter weather conditions across the United States. The data includes reflectivity levels, echo tops, and convective outlooks, as well as detailed information on precipitation types such as rain, freezing rain, ice pellets, and snow. Winter weather hazards like icing severity, turbulence, and low-level wind shear (LLWS) are also covered. The report emphasizes the importance of monitoring storm tracks and temperature shifts, which can influence precipitation types and accumulation levels. Additionally, warnings for severe thunderstorms, tornadoes, and winter storms are highlighted for aviation safety. Source time: not specified.

Gusty Winds and Warm Weather in Las Vegas This Week

Las Vegas is experiencing gusty winds and warm temperatures this week, with scattered showers and thunderstorms expected east of the city. Highs are forecasted to remain in the mid-90s °F (around 35 °C) through the weekend. Thursday will see gusts reaching up to 30 mph, while Friday will bring breezy conditions that are expected to ease by the afternoon. The weekend promises calmer weather, with mostly sunny skies on Saturday and some cloud cover on Sunday. The autumnal equinox will officially mark the start of fall on Tuesday, September 22, at 5:05 p.m. Slight chances of showers are expected to return early next week.

Atlantic Tropics Show Signs of Life After a Quiet Stretch

The Atlantic hurricane season remains unusually quiet, with no hurricanes forming so far in 2026, but forecasters are monitoring several areas that could support renewed tropical activity. A disorganized storm near Florida could move into the Gulf later this week and may develop into a tropical depression or named storm into the weekend, though the potential remains low. Farther ahead, an area stretching from north of the Bahamas to the eastern Gulf and northwestern Caribbean could become a focus for tropical development from late September into early October as wind shear may be lower. El Niño continues to suppress Atlantic activity through strong wind shear and dry air.