An index of anomalous convective instability to detect tornadic and hail storms

Qian, Weihong; Leung, Jeremy Cheuk‐Hin; Luo, Weimeng; Du, Jun; Gao, Jidong

doi:10.1007/s00703-017-0576-z

Cited by 10 publications

(7 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Those anomalous structures either in vertical or horizontal can potentially be used to construct a dust storm forecast index as having been done for convective storms in Qian, Leung, Luo, et al. (2019). The above thermodynamical process shows evidence that the anomalous thermal contrast initially forms an anomalous wind pattern near the surface, while the latter induces a dust mass formation over dry desert.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

Section: Conclusion and Discussionmentioning

confidence: 99%

“…This anomalous spatial pattern of wind, temperature, and geopotential anomalies is well established and can be traced back for several days. Those anomalous structures either in vertical or horizontal can potentially be used to construct a dust storm forecast index as having been done for convective storms in Qian, Leung, Luo, et al (2019). 4.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

“…This index could then be calculated from a numerical weather prediction model forecast. Our previous study shows that a whole‐atmosphere anomaly based convection index has much clearer signal to indicate convective storm areas (Qian, Leung, Luo, et al., 2019). The same could be applicable for dust storms.…”

Section: Introductionmentioning

confidence: 96%

See 3 more Smart Citations

Anomaly Based Synoptic Analysis and Model Prediction of Six Dust Storms Moving From Mongolia to Northern China in Spring 2021

Qian

Leung²,

Ren

et al. 2022

JGR Atmospheres

Self Cite

View full text Add to dashboard Cite

Six dust storms that originated from Mongolia and moved to northern China in Spring 2021 are investigated by the anomaly variable‐based analysis method, which is compared to the traditional total‐variable based analysis method. Strong surface wind is a force to form dust storms as commonly known in current practice. However, dust area depicted by total‐wind model product analysis and operational forecast has a large bias to observation even for leading 24 hr. The analysis method of anomaly based variables showed that the domain of an airborne dust storm observed from satellite images is usually located between two neighboring convergence lines of 850 hPa anomalous winds. This connection of dust storm associated with the anomalous wind convergence extends southwestward from an anomalous cyclone and moves from Mongolia to northern China or Northeast China. It is thermodynamically associated with an anomalous thermal contrast, which has a spatial structure of wind, temperature, and geopotential height anomalies in the troposphere. We further found that numerical weather prediction products of the ECMWF model are able to indicate the anomalous wind pattern with lead times of 4–8 days by applying the anomaly based analysis approach. Therefore, this approach can not only depict dust area better but also reveal predictors much easier compared to the traditional total‐variable or full‐field‐based analysis method.

show abstract

Section: Conclusion and Discussionmentioning

confidence: 99%

Section: Conclusion and Discussionmentioning

confidence: 99%

Section: Conclusion and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

See 2 more Smart Citations

Anomaly Based Synoptic Analysis and Model Prediction of Six Dust Storms Moving From Mongolia to Northern China in Spring 2021

Qian

Leung²,

Ren

et al. 2022

JGR Atmospheres

Self Cite

View full text Add to dashboard Cite

show abstract

“…In the Earth's atmosphere, typhoons belong to large-scale weather systems, while tornadoes belong to small-scale weather systems. Tornadoes also develop under the orthogonal collision of the surrounding environment disturbance air flows [24]. The vertical ascending and sinking air flows in the center of the tornado is perpendicular to the directions of the environmental disturbance air flows.…”

Section: The Physical Essence Of the Photoelectric Effectmentioning

confidence: 99%

On the Physical Process and Essence of the Photoelectric Effect

Qian¹

2023

JAMP

Self Cite

View full text Add to dashboard Cite

A hundred years ago, Planck and Einstein and others created quantum theories or quantum mechanics while they explained the photoelectric effect. Planck and Einstein empirically obtained a statistical relationship between the energy of light quantum and the frequency of light but have not studied the physical process and essence of the photoelectric effect, so some photoelectric phenomena are difficult to be explained by existing quantum mechanics currently. In this paper, a dynamical process of orthogonal interaction between a photon and an electron to form a new state of matter in photoelectric effect experiments is studied so finding that the Planck constant is a product value of the mass, length, and velocity of a high-energy particle. The dynamics of the orthogonal collision of matter (particles) can not only give the physical process and essence of the photoelectric effect, but also have great significance for the further development of quantum mechanics. It can physically explain phenomena such as wave-particle duality and quantum entanglement in the motion of high-energy particles. Its prospects can be widely used in cosmic physics, macro physics, and micro physics.

show abstract

Applying Anomaly-based Weather Analysis to the Prediction of Low Visibility Associated with the Coastal Fog at Ningbo-Zhoushan Port in East China

Qian

Leung

Chen³

et al. 2019

Adv. Atmos. Sci.

Self Cite

View full text Add to dashboard Cite

Low visibility episodes (visibility < 1000 m) were studied by applying the anomaly-based weather analysis method. A regional episode of low visibility associated with a coastal fog that occurred from 27 to 28 January 2016 over Ningbo-Zhoushan Port, Zhejiang Province, East China, was first examined. Some basic features from the anomalous weather analysis for this case were identified: (1) the process of low visibility mainly caused by coastal fog was a direct response to anomalous temperature inversion in the lower troposphere, with a warm center around the 925 hPa level, which was formed by a positive geopotential height (GPH) anomaly in the upper troposphere and a negative GPH anomaly near the surface; (2) the positive humidity anomaly was conducive to the formation of coastal fog and rain; (3) regional coastal fog formed at the moment when the southwesterly wind anomalies transferred to northeasterly wind anomalies. Other cases confirmed that the low visibility associated with coastal fog depends upon low-level inversion, a positive humidity anomaly, and a change of wind anomalies from southwesterly to northeasterly, rain and stratus cloud amount. The correlation coefficients of six-hourly inversion, 850−925-hPa-averaged temperature, GPH and humidity anomalies against visibility are −0.31, 0.40 and −0.48, respectively, reaching the 99% confidence level in the first half-years of 2015 and 2016. By applying the anomaly-based weather analysis method to medium-range model output products, such as ensemble prediction systems, the anomalous temperature−pressure pattern and humidity−wind pattern can be used to predict the process of low visibility associated with coastal fog at several days in advance.

show abstract

An index of anomalous convective instability to detect tornadic and hail storms

Cited by 10 publications

References 32 publications

Anomaly Based Synoptic Analysis and Model Prediction of Six Dust Storms Moving From Mongolia to Northern China in Spring 2021

Anomaly Based Synoptic Analysis and Model Prediction of Six Dust Storms Moving From Mongolia to Northern China in Spring 2021

On the Physical Process and Essence of the Photoelectric Effect

Applying Anomaly-based Weather Analysis to the Prediction of Low Visibility Associated with the Coastal Fog at Ningbo-Zhoushan Port in East China

Contact Info

Product

Resources

About