Understanding the ACE Index: Measuring tropical cyclone energy
The Accumulated Cyclone Energy (ACE index) is a metric used to express the energy a tropical cyclone uses during its lifetime. The calculation multiplies a …
Ireland braces for Éowyn on Friday, the most powerful storm in decades. Winds to near 200 km/h are forecast
Friday will bring one of Ireland’s most violent Atlantic storms in decades. Destructive winds, significant waves, and extremely low surface pressure are forecast as a …
Multiple intense Atlantic storms will blast into Ireland and the UK next weekend
The ongoing disruptions of the Polar Vortex aloft led to its southern lobe emerging over North America. Its related cold wave will drag Arctic air …
Spring 2025 Europe Forecast: Early Forecasts show a high-pressure pattern, with the low-pressure zone further north
Long-range forecast data for Spring 2025 is now available, and it shows a mostly warmer season over Europe, with normal precipitation. A predominantly high-pressure pattern …
Winter Storm Enzo brings rare snowfall to the Gulf Coast, Arctic Blast intensifies
The powerful Arctic Blast is underway across Canada and the United States, spreading south across the continent. This is the most significant this season, thanks …
Red sprites, gigantic jets, elves: Captivating upper-atmosphere lightning
If ordinary lightning seems pretty ordinary, upper-atmosphere lightning is something else – an entire zoo of various upper-atmosphere electrical discharges. Red sprites, gigantic and blue …
Understanding severe thunderstorms: criteria and impact
During storm season, there is increasing talk about severe thunderstorms. What does “severe” in severe thunderstorms mean? When does a thunderstorm become severe? What criteria …
An Unstoppable 2025 Polar Vortex: The United States cold from the Stratosphere
The Polar Vortex and its dynamics are powering recent and upcoming cold events in the United States. We are starting to see that an unusually …