Mathematical and Synoptic Aspects of a Small-Scale Wave Disturbance Over the Lower Great Lakes Area

Ferguson, H. L.

doi:10.1175/1520-0450(1967)006<0523:masaoa>2.0.co;2

Cited by 10 publications

(6 citation statements)

References 2 publications

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“…An inspection of the radar reports for this region suggests that the convective activity is considerably more extensive than would appear from the hourly network. Speculative arguments on the role of convective activity in initiating gravity waves has also appeared in papers by Goldie (1925), Pothecary (1954), Wagner (1962), and Ferguson (1967). The propagation medium i n the present case appears to be a low-level inversion representing overrunning of cold air by tropical air just north of the quasi-stationary front along the gulf coast.…”

Section: Discussionmentioning

confidence: 51%

“…Pothecary's hypothesis could not be substantiated, however, because of the sparsity of synoptic observations over the ocean to the southeast of England. Ferguson (1967) examined a winter case of gravity wave propagation over the Great Lakes area similar in nature to the cases of Brunk and Pothecary mentioned previously. However, Ferguson's case was noteworthy for wave amplitudes of several millibars.…”

Section: Introductionmentioning

confidence: 87%

“…It is of interest to note that the wave disturbance dissipated rapidly as it approached the North Carolina coast where the inversion lowered and weakened. Ferguson (1967) applied Goldie's (1925) equations to his study of a squall line situation over the Great Lakes. The results were reasonable in terms of surface-pressure amplitude.…”

Section: Nc and Slopes Downward And Weakens Toward Capementioning

confidence: 99%

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Gravity Wave Phenomena Accompanying East Coast Cyclogenesis

Bosart

Cussen

1973

Mon. Wea. Rev.

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remarkable example of gravity wave propagation over the southeastern United States on Dec. 3, 1968, is described. The wave developed within the cold air north of a quasi-stationary front along the coast of the Gulf of Mexico in apparent responde to convective activity associated with a weak cyclonic disturbance on the front. The wave maintained its identity for 14 hr while propagating east-southeastward at 13 m/s in a direction nearly opposite t o the low-level flow. Gravity-wave-related pressure drops exceeded 7 mb over an average period of 1 hr. Strong and gusty winds blowing perpendicularly to the isobars toward lower pressure accompanied the waverelated pressure fall. Precipitation of several hours duration ceased abruptly with the wave passage, along with increases in the ceiling and horizontal visibility. Comparison is made with results from other papers dealing with wave propagation along frontal surfaces. May1973 BosartandCussen 1 447 FIQURE 3.-Detailed surface maps a t 3-hourly intervals for time aeriods indicated. Isobars are drawn for every 1 mb and winds a in knots, plotted according to the conventional station model.

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Section: Discussionmentioning

confidence: 51%

Section: Introductionmentioning

confidence: 87%

Section: Nc and Slopes Downward And Weakens Toward Capementioning

confidence: 99%

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Gravity Wave Phenomena Accompanying East Coast Cyclogenesis

Bosart

Cussen

1973

Mon. Wea. Rev.

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“…Several théories hâve been proposed to explain thé génération of mesoscale gravity waves, which include convectively induced, shearing instability and geostrophic adjustment. For example, Wagner (1962), Ferguson (1967), and Bosart and Cussen (1973) showed thé collocation of convective activity with solitary waves having wavelengths on thé order of 100 km. Lin and Goff (1988) documented thé propagation of a convectively generated intense solitary wave.…”

Section: Introductionmentioning

confidence: 99%

Numerical prediction of an intense convective system associated with the July 1987 montreal flood. part I: Gravity waves and the squall line

Bélair¹,

Zhang²,

Mailhot

1995

Atmosphere-Ocean

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In this study, a 24-h high-resolution numerical prédiction of a prefrontal squall Une associated with thé 14 July 1987 Montréal flood is employed to investigate thé origin and rôle ofmesoscale gravity waves in thé development ofthe squall system. The 24-h intégration using an improved mesoscale version of thé Canadian régional finite-element model is first validated against available observations; then non-observable features are diagnosed to reveal thé relationship between deep convection and gravity wave events. It is shown that thé model reproduces well many aspects of thé squall Une, such as thé propagation and organization ofthe convective system, as well as ils associated précipitation. It isfound that gravity waves are first excited near Lake Erie, following thé initiation of early convective activity. Then, thèse waves propagate eastward and northeastward at speeds of20 and 35 m s~l, respectively. As thé waves propagate downstream, deep convection radiâtes rapidly behind thé wave trough axis, forming a long Une of squall convection. Because thé squall Une moves with thé gravity waves in a "phase-locked" manner, deep convection has a significant influence on thé structure and amplitude of thé gravity waves. The sensitivity of thé wave-squall prédiction to varions parameters in convective parameteriiation is also examined. RÉSUMÉ Dans cette étude, la prédiction numérique haute résolution d'une ligne de grain pré-frontale associée à la crue du 14 juillet 1987 à Montréal est utilisée pour trouver l'origine et le rôle d'ondes de gravité mésoéchelles dans le développement du système.

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“…Matthews [1964] observed lightning in association with large (up to 5-cm diameter), wet snowflakes. Ferguson [ 1967] discussed the nature of a winter squall line producing snow and ice pellets that was also associated with thunder. Stewart and Patenaude [1988] reported thunder in a storm over Newfoundland in which the available information showed that the transition region had to be < 100 km from the location of the thunder.…”

Section: Thundermentioning

confidence: 99%

Precipitation type transition regions in winter storms over southern Ontario

Stewart¹,

King²

1990

J. Geophys. Res.

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Two winter storms passed through the Toronto area during November and December 1987. Information from radar, rawinsonde, and surface observations was analyzed in order to determine the kinematic flow fields and thermodynamic environment in the vicinity of the transition at the surface between snow and rain. This region was also linked to heavy precipitation and thunder. Updrafts preferentially occurred over the snow region, and deep near‐0°C layers occurred in the transition region. Observations are consistent with a mesoscale circulation initiated by melting snow and possibly with the occurrence of symmetric instability. It is further suggested that large, possibly wet, snowflakes being formed within such deep near‐0°C layers would contribute to the radar detection of precipitation bands near the precipitation transition region.

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Mathematical and Synoptic Aspects of a Small-Scale Wave Disturbance Over the Lower Great Lakes Area

Cited by 10 publications

References 2 publications

Gravity Wave Phenomena Accompanying East Coast Cyclogenesis

Gravity Wave Phenomena Accompanying East Coast Cyclogenesis

Numerical prediction of an intense convective system associated with the July 1987 montreal flood. part I: Gravity waves and the squall line

Precipitation type transition regions in winter storms over southern Ontario

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