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Marko Korosec

Marko Korošec is a veteran storm chaser and expert weather forecaster with over 25 years of experience specializing in the analysis of extreme atmospheric events. A former forecaster for Estofex, he draws on deep-layer shear dynamics and thermodynamic analysis. Marko is highly recognized for his technical proficiency in short- and mid-term forecasting of high-impact weather, including severe convective systems and complex winter weather. In addition to his SWE role, Marko worked for 17 years as a Road Weather and Maintenance Decision Support System Supervisor until 2022, applying his expertise to the critical field of transportation meteorology. He focused on the forensic analysis of road surface conditions and the impact of extreme winter weather, including blizzards, freezing rain, and ice storms, on infrastructure safety. His work was instrumental in developing strategies for proactive winter maintenance and real-time hazard mitigation. Marko’s unique dual-career path combines rigorous meteorological forecasting with world-class visual documentation. An acclaimed visual artist and winner of the 2014 National Geographic Traveler Photo Contest, he uses his "awe-inspiring" photography to illustrate the power and complexity of the atmosphere. By merging technical forensic details with high-resolution visual evidence, Marko serves as a vital bridge between high-level atmospheric science and public understanding, dedicated to capturing "the fury of nature" for a global audience. Photo gallery: MarkoKorosec.net

A significant winter storm brings Snow Blizzard to the north and Severe Weather Outbreak to the south this week

March 2, 2025 by Marko Korosec
winter storm lola snow blizzard severe weather outbreak march 2025 united states

A significant Winter Storm Lola is forecast to develop over the United States on Tuesday and rapidly develop while moving across the central U.S. towards … Read more

Categories Global weather Tags canada, march 2025, severe weather outbreak, snow blizzard, storm lola, tornadoes, united states, winter storm

Noctilucent Clouds: A rare atmospheric phenomenon

February 22, 2025 by Marko Korosec
noctilucent clouds nlc

Have you ever seen noctilucent clouds (NLC)? These may be the most unusual and rare clouds you may ever see. Noctilucent clouds are to normal … Read more

Categories Basic Weather Theory Tags clouds, nlc clouds, noctilucent, noctilucent clouds

Types of convective clouds – from fair-weather clouds to thunderstorms

February 21, 2025 by Marko Korosec
convective-cloud-types

Convection forms distinct types of clouds. Convective clouds are divided into two types (genera): cumulus and cumulonimbus. Each successive kind and species displays more vertical … Read more

Categories Severe Weather Theory Tags calvus, capillatus, clouds, congestus, convection, convective cloud types, convective clouds, cumulonimbus, cumulus, humilis, mediocris, thunderstorm

Thunderstorm basics: Understanding the power of nature

February 19, 2025 by Marko Korosec
typical thunderstorm

In this section, we will take a general look at the thunderstorms. What is a typical thunderstorm? We will examine its essential components and how … Read more

Categories Severe Weather Theory Tags anvil cloud, convection, downdraft, equilibrium level, pileus cloud, severe thunderstorm, thunderstorm, thunderstorms, tropopause, typical storm, updraft, wind shear

Back-sheared anvil: The role of wind shear in shaping cumulonimbus anvil

February 15, 2025 by Marko Korosec
back sheared anvil

A back-sheared anvil is the expression for a cumulonimbus anvil that spreads against (upwind) into relatively strong winds (jet stream) aloft. Anvil vs. wind   … Read more

Categories Severe Weather Theory Tags back-sheared anvil, convective clouds, severe thunderstorm, thunderstorm, updraft, wind shear

Frigid Arctic cold returns next week: A large part of the U.S. heads back into deep freeze

February 15, 2025 by Marko Korosec
polar vortex frigid arctic cold blast winter storm february 2025 canada united states

Active Polar Vortex above North America takes no break. Next week, its southern lobe will generate another significant, frigid cold Arctic Blast from Canada into … Read more

Categories Global weather Tags arctic blast, canada, cold outbreak, frigid cold, Polar Vortex Archive, snow forecast, storm jett, united states, winter storm

Understanding overshooting top in thunderstorms

February 11, 2025 by Marko Korosec
overshooting top

Overshooting tops develop on thunderstorms that have powerful updrafts. Overshooting tops typically develop on Cumulonimbus capillatus incus clouds. The updraft punches through the equilibrium level … Read more

Categories Severe Weather Theory Tags convection, overshooting top, severe thunderstorm

Intense twin winter storms graze across central and eastern U.S. this week

February 9, 2025 by Marko Korosec
polar vortex winter storm harlow iliana snow forecast great lakes northeast united states

The active Polar Vortex southern lobe is blazing across the Northern Hemisphere, producing significant cold waves across the North American continent. Two major storms are … Read more

Categories Global weather Tags freezing rain, great lakes, ice storm, northeast US, Polar Vortex Archive, snow, snowstorm, storm Garnett, storm harlow, storm iliana, united states, winter storm
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