{"id":14992,"date":"2026-08-01T14:07:45","date_gmt":"2026-08-01T12:07:45","guid":{"rendered":"https:\/\/www.deluxemallorca.com\/?p=14992"},"modified":"2026-10-13T09:18:20","modified_gmt":"2026-10-13T07:18:20","slug":"wenn-ein-waldbrand-sein-eigenes-wetter-erschafft","status":"publish","type":"post","link":"https:\/\/www.deluxemallorca.com\/en\/wenn-ein-waldbrand-sein-eigenes-wetter-erschafft\/","title":{"rendered":"When a forest fire turns into a firestorm"},"content":{"rendered":"
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When a forest fire turns into a firestorm<\/h1>\n

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On the formation of one of the largest pyrocumulonimbus clouds over Europe to date: The story of extreme fire-driven convection leads to a m<\/span>eteorological first for France.<\/span><\/strong><\/h3>\n

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In the summer of 2026, France was confronted with a phenomenon previously known primarily from Australia, North America, and Siberia: a massive pyrocumulonimbus cloud\u2014internationally referred to as PyroCb and meteorologically classified as *Cumulonimbus flammagenitus*.<\/span><\/p>\n

Above an extremely intense forest fire in southwestern France, a distinct thunderstorm cloud formed from a rising column of smoke and heat. The fire front was thus no longer merely generating heat and smoke but had begun to create its own local weather system. French emergency responders described the event as unprecedented in the country.<\/span><\/p>\n

A pyrocumulonimbus cloud forms when a fire releases enough energy to cause hot air to rise at tremendous speed. Within this massive convection column, smoke particles, water vapor, and combustion products are carried kilometers high. When the rising air reaches sufficiently cold layers of the atmosphere, the water vapor condenses to form a thunderstorm cloud.<\/span><\/p>\n

The result is a paradoxical phenomenon: the fire generates a thunderstorm, and the thunderstorm, in turn, can intensify the fire. Through strong downdrafts, dry katabatic winds, and its own lightning discharges, a pyrocumulonimbus cloud can spark new fires and make the spread of a fire more unpredictable.<\/span><\/p>\n

Hiroshima 1945: One of the earliest documented fire clouds<\/span><\/h3>\n

One of the most famous historical fire clouds was created following the dropping of the atomic bomb on Hiroshima, Japan, on August 6, 1945. The explosion initially generated extreme thermal radiation. Temperatures in the immediate vicinity of the blast center reached several thousand degrees Celsius. Thousands of buildings made of wood and paper ignited almost simultaneously.<\/span><\/p>\n

A massive, rising column of hot air, smoke, and ash formed over the city. This phenomenon resembled a fire-induced convection cloud\u2014an early form of what is known today as a pyrocumulus or pyrocumulonimbus cloud.<\/span><\/p>\n

The decisive factor was the enormous simultaneous release of thermal energy.<\/span><\/p>\n

Incendiary bombs and the development of firestorms in wars<\/span><\/h3>\n

Incendiary weapons designed to create large-scale fires were developed during the 20th century. Entire cities were subjected to incendiary bomb attacks, particularly during World War II. These attacks employed, among other things, incendiary agents that promoted the spread of massive fires. However, the extreme firestorms that devastated Hamburg in 1943, Dresden in 1945, and Tokyo in 1945 were not caused solely by the incendiary materials themselves; rather, they resulted from a combination of factors: a vast number of buildings burning simultaneously, dense urban development, the influx of oxygen driven by powerful updrafts, and the release of immense heat.<\/span><\/p>\n

Well-known major events<\/span><\/h3>\n