Occluded front - Wikipedia
A wide variety of weather can be found along an occluded front, with heavy thunderstorms and tornadoes possible, but usually, their passage is instead associated with a drying of the air mass. Additionally, cold core funnel clouds are possible if the wind shear is …
Glossary of tornado terms - Wikipedia
Severe thunderstorm (svr) – A hazardous thunderstorm capable of causing injury or damage. The U.S. National Weather Service defines a severe thunderstorm as one producing 58 mph (93 km/h) or greater winds, 1 in (2.5 cm) or larger hail, or producing a funnel cloud or tornado.
Rear flank downdraft - Wikipedia
A clear slot can be observed to wrap around a tornado or form away from a tornado in the shape of a horseshoe. This clearing is most likely the formation of the hook echo region associated with tornado formation. [2] An RFD originating in dry air warming adiabatically can produce warmer observations out of the RFD at the surface.
Occluded Fronts and the Occlusion Process: A Fresh Look at
2011年4月1日 · These four tenets help to explain anomalies in the Norwegian cyclone model, such as how occluded fronts that spiral around the low center do not require catch-up to form, how Shapiro–Keyser cyclones undergo occlusion, why some cyclones do not form occluded fronts, how some cyclones deepen after occlusion, why few cold-type occlusions have ...
near-ground rotation arises and is amplified to tornado strength remain a challenge. We will review our current understanding of the origins of rotation in supercells and the requisites for tornadogenesis. We also will discuss the challenges for forecasters and what strategies are likely to be most fruitful given the current state of our ...
Conceptual diagram of the failed occlusion process. The tornado …
As the RFGFS associated with the occlusion (RFGFS 1) wraps RFD air around the updraft and tornado, the tornado begins to move to the north and eventually the northwest in an occlusion-type...
Severe Weather 101: ‘Twisters’ Movie FAQ - NOAA National Severe ...
But having two distinctly different tornadoes simultaneously and very near each other is also possible and has happened. This typically occurs when the first tornado begins to move towards the rear of the parent larger scale rotation, a process called “occlusion” whereby the storm is essentially ejecting the rotating column.
Occluded fronts and the occlusion process: A fresh look at …
These models contain the descriptions of the occlusion that need to be continually updated to gather data and information about cyclones. A new conceptual model is developed that explains anomalies, such as weaknesses, inconsistencies, and contradictions of existing theory.
Conceptual diagram of the failed occlusion process. The tornado …
2013年5月20日 · The tornado and mesocyclone are first impacted by an occlusion-forcing RFGFS (RFGFS 1), which wraps around the tornado, causing a turn to the north.
Tornadoes are violently rotating columns of air, usually associated with a swirling cloud of debris or dust near the ground and a funnel-shaped cloud extending downward from the base of the parent cumulonimbus updraft.