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| Titel |
Lightning and rain dynamic indices as predictors for flash floods events in the Mediterranean |
| VerfasserIn |
N. Harats, B. Ziv, Y. Yair, V. Kotroni, U. Dayan |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7340
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| Digitales Dokument |
URL |
| Erschienen |
In: 10th EGU Plinius Conference on Mediterranean Storms (2008) ; Nr. 23 (2010-03-29), S.57-64 |
| Datensatznummer |
250015107
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| Publikation (Nr.) |
 copernicus.org/adgeo-23-57-2010.pdf |
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| Zusammenfassung |
The FLASH EU funded project aims to observe, analyze and model lightning
activity in thunderstorms for use in short term forecasting of flash floods
in the Mediterranean region. Two new indices, aimed to assess the potential
for heavy precipitation and flash-floods, are proposed and evaluated. The
first is a lightning index – the MKI, which is a modified version of the
KI-index. The applied index gives more weight to the lower- and mid-level
relative humidity. The second is a new rain index, the RDI, which is the
integrated product of specific humidity and vertical velocity. With the aim
to contribute to the aforementioned objectives, 3 flash flood events, two in
Israel and one in Greece are analyzed in the present study, using the 2
proposed indices.
The NCEP/NCAR reanalysis database, of 2.5°×2.5° resolution,
failed to resolve the meso-scale features of the observed flash flood
events. Therefore, the ECWMF database, of 0.5°×0.5°
resolution, was used for calculating and displaying the two indices.
Comparison between the observed rain and lightning and the respective
indices for the two pieces of data was performed for the flash flood events.
The results show good concordance of both indices with timing and spatial
distribution in 2 of them, while in one of them is displaced by more than
50 km. The good agreement in locating the maximum between the MKI and RDI
suggests that the proposed indices are good predictors for both intense
lightning activity and torrential rain and consequently, for potential flash
floods. |
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