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Volcanic lightning is an electrical discharge caused by a volcanic eruption rather than from an ordinary thunderstorm. Volcanic lightning arises from colliding, fragmenting particles of volcanic ash (and sometimes ice ), [ 1 ] [ 2 ] which generate static electricity within the volcanic plume , [ 3 ] leading to the name dirty thunderstorm .
Ashfall warning NPW – A volcano undergoing a major eruption is creating the likelihood of significant impact on the public (with higher risk to the health of people with respiratory illnesses) and maritime activity due to ashfall accumulation forecast to be greater than or equal to 0.25 inches (6.4 mm), significant debris, lava, or lahar flows.
Excessive Lightning; Derecho; Extreme wind (70 mph or greater) Downpours; Heavy rain; Flood, flash flood, coastal flooding; Hail; High winds – 93 km/h(58 mph) or higher. Lightning; Thundersnow, Snowsquall; Tornado; Windstorm (gradient pressure induced) Severe thunderstorm (hailstorm, downburst: microbursts and macrobursts)
The spectacular bolts of lightning streak through the ash cloud as red hot molten lava slowly seeps towards villages below that have since been engulfed by the liquid fire as if the gates of hell ...
The Cumbre Vieja volcano on the Spanish island of La Palma spewed clouds of ash and other material on November 4, creating volcanic lightning.On Wednesday, explosions showered ash on nearby pine ...
The top spot goes to an astonishing video that dispels the common myth that lightning never strikes the same place twice. In reality, the Willis Tower in Chicago is the most frequently struck U.S ...
Positive lightning is less common than negative lightning and on average makes up less than 5% of all lightning strikes. [ 10 ] A bolt from the blue lightning strike which appears to initiate from the clear, but [ clarification needed ] the turbulent sky above the anvil cloud and drive a bolt of plasma through the cloud directly to the ground.
Also actiniform. Describing a collection of low-lying, radially structured clouds with distinct shapes (resembling leaves or wheels in satellite imagery), and typically organized in extensive mesoscale fields over marine environments. They are closely related to and sometimes considered a variant of stratocumulus clouds. actinometer A scientific instrument used to measure the heating power of ...