The Heat Burst of 29 May 1976

Johnson, Brenda C.

doi:10.1175/1520-0493(1983)111<1776:thbom>2.0.co;2

Cited by 32 publications

(33 citation statements)

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“…Typically these therCorrespondence to: F. Stel (fulvio.stel@arpa.fvg.it) mal anomalies are related to Foehn episodes (Seibert, 1990;Yoshino, 1976;Giaiotti et al, 2007) but not all the observed sudden local temperature increases can be explained through the Foehn mechanism. In fact, mainly in the last few decades, thanks to the development of weather mesonetworks, the existence of "heat bursts" has been confirmed (see, among others, Froude and Simmonds, 1965;Johnson, 1983). Currently the amount of reports on "heat waves" is grown enough to permit the development of a preliminary climatology of these events at least in some areas (Lane, 2002).…”

Section: The Different Classes Of Thermal Anomaliessupporting

confidence: 93%

Mesoscale heat waves induced by orography

Gladich

Gallai²,

Giaiotti³

et al. 2008

Adv. Sci. Res.

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Abstract. This work is devoted to the analysis of an unusual and sudden thermal fluctuation that interested portions of Friuli Venezia Giulia (Italy) during the night of 27 July 1983. The whole 1983 summer was extremely warm in Europe and in particular on the Italian peninsula, from the Alps down to Sicily. Nevertheless, the day of 27 July 1983 in Friuli Venezia Giulia deserves special attention because the observed maximum temperatures did not occur during day-time but during night-time (from 23:00 up to 24:00 LT, 21:00-22:00 UTC). Peaks of 34.8• C and values of relative humidity of the order of 28% were registered by the official network of weather stations. This event interested mainly the central-eastern part of the plain of Friuli Venezia Giulia, a few kilometers far from the Slovenian border and relieves. The thermal anomalies lasted up to an hour, then temperatures decreased toward values more usual for the climate of the month. The study of this event is carried out with the aid of the AR-WRF numerical atmospheric model, initialized through the ECMWF analysis. The numerical simulations highlight the important role played by orography, jointly with the peculiar thermal structure of the atmosphere, for the enhancing of the internal wave pattern over that area. According to the sensitivity studies realized, the amplification of the internal wave pattern might represent a possible explanation for that meteorological enigma.

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Section: The Different Classes Of Thermal Anomaliessupporting

confidence: 93%

Mesoscale heat waves induced by orography

Gladich

Gallai²,

Giaiotti³

et al. 2008

Adv. Sci. Res.

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“…These events, known as heat bursts (Johnson, 1983), have been associated with rapid increases in air temperature, rapid decreases in humidity, pressure jumps and strong, gusty winds (Williams, 1963;Sloan, 1966;Johnson, 1983;Johnson et al, 1989;McNulty, 1991;Bernstein and Johnson, 1994).…”

Section: Introductionsupporting

confidence: 92%

“…At the same time, a stable layer extended from the surface to approximately 750 hPa. Such profiles were consistent with those noted previously as being conducive toward heat burst formation (Johnson et al, 1983(Johnson et al, , 1989Bernstein and Johnson, 1994;McPherson et al, 2011). Figure 7).…”

Section: Synoptic Conditionsmentioning

confidence: 99%

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Mesoscale observations of an extended heat burst and associated wind storm in Central Oklahoma

Basara¹,

Rowell²

2011

Meteorological Applications

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On 13 May 2009, 13 surface-based observing stations within central and western Oklahoma recorded maximum wind speeds in excess of 22.5 m s −1 , along with gusts exceeding 28 m s −1 in isolated locations, during a localized wind storm that lasted in excess for over an hour. These wind speeds were associated with an enhanced mesoscale pressure gradient that developed during the late evening of 12 May 2009 and early morning hours of 13 May 2009, which then slowly propagated from west to east. Ultimately, the event produced localized wind damage in northern portions of Oklahoma City. Analysis of the synoptic and mesoscale conditions present at each stage of the event revealed that specific parameters associated with heat bursts occurred during the event, but with the inclusion of varying mesoscale and microscale influences. As such, a close examination of the mesoscale pressure field indicated that a dynamically variable mesoscale convective system (MCS) produced a mesohigh/mesolow couplet that ultimately created the strong pressure gradient. The result was a prolonged period (in excess of 1 h) of enhanced wind speed values across a swath approximately 300 km in length and 50 km in width that were not directly associated with the anomalously warmer and drier conditions that occurred due to the heat burst.

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“…Three different scales of events linked to abnormally high temperatures. The scales are adapted from Orlanski (1975 If a smaller scale is considered, the glossary of AMETSOC defines a heat burst as a rare atmospheric event characterized by gusty winds, rapid temperature increase, and a decrease in relative humidity, typically occurring at night or early morning (Johnson, 1976;Glickman, 2000). It is usually associated with descending air during a thunderstorm.…”

Section: Introductionmentioning

confidence: 99%