Mesoscale characteristics of southern Adriatic bora storms
Item
Title (Dublin Core)
eng
Mesoscale characteristics of southern Adriatic bora storms
hrv
Mezoskalne karakteristike bure na južnom Jadranu
Description (Dublin Core)
eng
The bora in Dalmatia is compared to the better known bora in the northern Adriatic. Fifteen severe storms in Split are selected during the period January 1980 to January 1983.
It is shown that in most cases such a severe bora does not last long, but the gusts are above 30 m s-1, with the absolute maximum of 45 m s-1, and therefore it is comparable with the strength of northern Adriatic bora. The mean surface pressure distribution and AT 500 hPa for these cases emphasize a mesoscale cyclone in the southern Adriatic, which may or may not be seen on large scale (synoptic) charts. Two “bora types” according to local weather characteristics are distinguished. “Dark bora” (cyclonic type) with cloudy sky and precipitation is characterized by deeper surface cyclone and a pronounced upper-level trough from Baltic to the southern Adriatic, in contrast to cloudiness (anticyclonic) “clear bora” when mesoscale cyclone is further to the east of Adriatic. The upper level flow in latter case shows a cut-off low with N-NE current above the bora throughout the troposphere. These patterns are in agreement with Defant’s (1951) description of cyclone and anticyclone bora types; they stress both upstream and downstream influence and emphasize the interaction of large-, meso- and local-scale processes on the Dalmatian bora flow.
The ALPEX bora case of 11-15 March 1982 illustrates local differences in bora occurrence and strength along the Adriatic, and the time cross sections exhibit the characteristics of upstream vertical atmospheric structure for bora onset and decay.
It is shown that in most cases such a severe bora does not last long, but the gusts are above 30 m s-1, with the absolute maximum of 45 m s-1, and therefore it is comparable with the strength of northern Adriatic bora. The mean surface pressure distribution and AT 500 hPa for these cases emphasize a mesoscale cyclone in the southern Adriatic, which may or may not be seen on large scale (synoptic) charts. Two “bora types” according to local weather characteristics are distinguished. “Dark bora” (cyclonic type) with cloudy sky and precipitation is characterized by deeper surface cyclone and a pronounced upper-level trough from Baltic to the southern Adriatic, in contrast to cloudiness (anticyclonic) “clear bora” when mesoscale cyclone is further to the east of Adriatic. The upper level flow in latter case shows a cut-off low with N-NE current above the bora throughout the troposphere. These patterns are in agreement with Defant’s (1951) description of cyclone and anticyclone bora types; they stress both upstream and downstream influence and emphasize the interaction of large-, meso- and local-scale processes on the Dalmatian bora flow.
The ALPEX bora case of 11-15 March 1982 illustrates local differences in bora occurrence and strength along the Adriatic, and the time cross sections exhibit the characteristics of upstream vertical atmospheric structure for bora onset and decay.
Creator (Dublin Core)
Jurčec, Vesna
Visković, Smiljan
Subject (Dublin Core)
eng
bora wind; Adriatic
hrv
bura; Jadran
Publisher (Dublin Core)
Andrija Mohorovicic Geophysical Institute
Date (Dublin Core)
1994
Type (Dublin Core)
text
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Format (Dublin Core)
application/pdf
Identifier (Dublin Core)
https://hrcak.srce.hr/20021
eng
https://hrcak.srce.hr/file/31362
Source (Dublin Core)
Geofizika
ISSN 0352-3659 (Print)
ISSN 1846-6346 (Online)
Volume 11
Issue 1
Language (Dublin Core)
eng
Rights (Dublin Core)
info:eu-repo/semantics/openAccess
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By submitting a manuscript, the author accepts the application of the Creative Commons Attribution-NonCommercial 4.0 International License.
By submitting a manuscript, the author accepts the application of the Creative Commons Attribution-NonCommercial 4.0 International License.