On the Relationship Between the Velocities of Small Precipitation Areas and Geostrophic Winds

Ligda, Myron G. H.; Mayhew, William A.

doi:10.1175/1520-0469(1954)011<0421:otrbtv>2.0.co;2

Cited by 19 publications

(11 citation statements)

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“…Ligda and Mayhew (1954) compared the movement of small precipitation areas appearing on a radar scope with the geostrophic wind. Osawa and Ozaki (1960) studied the movement of rainfall cells observed in the unprecedented heavy rainfall which took place in Isahaya area on July 25, 1957.…”

Section: Tracking Of Mesoscale Rainfall Cellssupporting

confidence: 92%

Some Characteristic Features of the Heavy Rainfalls Observed over the Western Japan on July 9, 1967 Part 2: Displacement and Life Cycle of Mesoscale Rainfall Cells

Matsumoto¹,

Tsuneoka²

1969

Journal of the Meteorological Society of Japan

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Section: Tracking Of Mesoscale Rainfall Cellssupporting

confidence: 92%

Some Characteristic Features of the Heavy Rainfalls Observed over the Western Japan on July 9, 1967 Part 2: Displacement and Life Cycle of Mesoscale Rainfall Cells

Matsumoto¹,

Tsuneoka²

1969

Journal of the Meteorological Society of Japan

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“…An alternative approach to extrapolating rain areas linearly with their observed velocity is to advect them with a field of wind velocities. Ligda and Mayhew [1954], Tatehira and Makino [1974], Tatehira et al [1976], and Parsons and Hobbs [1983] have all reported regression relationships between radar echo movement and wind velocity. Smith [1975], on the other hand, found no reliable correlations between rain area movement and wind velocity at any level.…”

Section: Extrapolation Techniquesmentioning

confidence: 99%

Nowcasting of precipitation systems

Browning¹,

Collier²

1989

Reviews of Geophysics

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Digital remotely sensed observations of the atmosphere, particularly from radars and satellites, have become increasingly available over the last 15 years. Together with developments in computer technology this has stimulated the design and operation of a variety of systems to exploit these data in weather forecasting. Growing awareness of the importance of detailed site specific weather information and forecasts from zero to a few hours ahead has led to the emergence of a particular kind of forecasting called nowcasting which depends on the exceptionally detailed knowledge of the current pattern of weather that remote sensing can provide. This type of weather forecasting is reviewed, with emphasis on the measurement and extrapolation up to about 2 hours ahead of fields of various weather parameters, especially rainfall. Trends in the design of nowcasting systems are discussed, and potential benefits summarized. tion of the weather, have been available to forecasters in real time and in a digital form amenable to manipulation. Although the preparation of forecasts by extrapolating the observed fields might be regarded as a simple extension of what forecasters have done for generations, limitations in observing capability and understanding of mesoscale phenomena, together with the practical difficulties of handling vast quantifies of data quickly, make this a challenging task in practice.Since extrapolation is the basis of nowcasting systems, the quality of the resulting forecasts depends upon the time ahead for which linear extrapolation is valid. This varies for different weather systems as shown in Table 1. Frontal rainbands, for example, persist for many hours. However, severe weather caused by individual convective systems is short-lived, and linear extrapolation on its own is unlikely to provide good forecasts beyond an hour or so. The larger-scale systems with greater persistence, such as fronts, often act as the trigger for the smaller convective Published in 1989 by the American Geophysical Union. ß 345 ß Reviews of Geophysics, 27, 3 / August 1989 pages 345-370 Paper number 89RG01134 346 ß Browning and Collier: NOWCASTING OF PRECIPITATION SYSTEMS 27, 3 / REVIEWS OF GEOPHYSICS storm/blizzard High wind gusts 5-30 min very limited accompanying shallow showers Hurricane many hours fair Frontal passage many hours fair to good After Zipser [ 1983]. (Part of this table is from Doswell [ 1986].) 27, 3 /REVIEWS OF GEOPHYSICS Browning and Collier: NOWCASTING OF PRECIPITATION SYSTEMS ß 347 when and where it will be triggered, unless there is some well-def'med topographical forcing, for example. We shall not discuss the nonlinear methods further in this review; rather we concentrate on the conceptually simple linear nowcasting techniques that have been developed to characterize, track, and extrapolate the motion of existing weather features detected by mdars and satellite. At present, nowcasting systems in several countries are providing data for severe weather warning, hydrological forecasting, snow clearance on roa...

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“…UMEROUS studies have been made of the movements of thunderstorms in relation to winds aloft. Discussions and summaries of the principal results may be found in articles by H. B. Brooks [2], the U. S. Weather Bureau [10], and Ligda and Mayhew [6]. As noted in THE THUNDERSTORM, prior to the advent of radar it was not possible to obtain reliable in- 1 Based on a thesis submitted by Captain Katz, in partial fulfillment of the requirements for the degree of Master of Science.…”

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confidence: 99%

Movement of Large Convective Rainstorms in Relation to Winds Aloft

Newton

Katz

1958

Bulletin of the American Meteorological Society

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By means of hourly rainfall data from the Hydroclimatic Network, the motions of large rainstorms, of the kind associated with squall lines, are examined in relation to the winds aloft. Very little correlation is found between the speed of movement of the rainstorms and the wind speed at any level, although the fastest moving storms were associated with strong winds aloft. Significant correlation is found between direction of motion of rainstorms, and wind direction at 700 mb or higher levels. On the average, the rainstorms move with an appreciable component toward right of the wind direction. The difference between these results, and those from other studies based on small precipitation areas, is ascribed to propagation. The mechanism involved is discussed briefly.

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On the Relationship Between the Velocities of Small Precipitation Areas and Geostrophic Winds

Cited by 19 publications

References 0 publications

Some Characteristic Features of the Heavy Rainfalls Observed over the Western Japan on July 9, 1967 Part 2: Displacement and Life Cycle of Mesoscale Rainfall Cells

Some Characteristic Features of the Heavy Rainfalls Observed over the Western Japan on July 9, 1967 Part 2: Displacement and Life Cycle of Mesoscale Rainfall Cells

Nowcasting of precipitation systems

Movement of Large Convective Rainstorms in Relation to Winds Aloft

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