Mathematics – Logic
Scientific paper
Apr 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998georl..25.1181s&link_type=abstract
Geophysical Research Letters, Volume 25, Issue 8, p. 1181-1184
Mathematics
Logic
18
Meteorology And Atmospheric Dynamics: Atmospheric Electricity, Meteorology And Atmospheric Dynamics: Lightning, Meteorology And Atmospheric Dynamics: Precipitation
Scientific paper
On August 7, 1996, a flood of the Rio Gallego, in Aragon (Spanish central Pyrénées) wiped out the Biescas' campground, killing more than 80 persons. From the observations of two meteorological radars, this thunderstorm exhibited some of the radar characteristics of a supercell. It spread almost exactly over the Rio Gallego catchment area, up-stream of Biescas, and it remained above this area for about two hours, without any advection. The rainfall reached 100mmh-1 and the total cumulative amount locally reached 200 mm. The cloud-to-ground (CG) flash density averaged over 5×5km2 areas, was exceptionally high, around 2km-2, and the peak flash rate averaged over 5-minute periods reached 11.6min-1 within the cell area. The evolution of the CG flash rate and the radar reflectivity were closely correlated. The flash rate reached high values before the arrival of the precipitation at the ground. We observe also a very good agreement between the location of the intense rain at the ground and the high CG flash density. The rainfall water volume per flash was 3×104m3, a value in agreement with previous work. We propose that quantitative measurements of the lightning activity may provide valuable information for flash-flood nowcasting and short-term forecasting in mountainous areas.
Chauzy S.
Mesnard Fred
Molinié G.
Sauvageot Henri
Soula Serge
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