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- W2123838041 abstract "A set of mesoscale numerical simulations using the Pennsylvania State University–National Center for Atmospheric Research model is used to investigate two cases of extreme precipitation over eastern Spain. Both cases (3–4 November 1987 and 20 October 1982) were characterized by quasi-stationary mesoscale convective systems that developed over the Valencia region and lasted more than 30 and 12 h, respectively. Rainfall totals in 24 h exceeded 800 mm on 3–4 November and 400 mm on 20 October at some localities of that region. The first event occurred within a weak and very stagnant synoptic pattern under a persistent easterly/northeasterly low-level jet stream impinging on the Valencian orography. In contrast, the second case involved a westward-moving surface low driven by an upper-level jet streak, which evolved along the northern edge of an upper-level cutoff low over North Africa. In both cases, the mesoscale model forecast spatial details of the precipitation field reasonably accurately, as well as capturing its long duration, but underestimated the storm total precipitation. Model output fields suggest that the development of a surface mesolow by latent heat release, as well as lee cyclogenesis induced by the Atlas Mountains, could have played an important role in both events by providing low-level convergence and enhanced upslope winds. Thus, a factor separation technique is used to explore this issue. For the event of 3–4 November 1987, latent heat is decisive for explaining the precipitation maximum over central Valencia, and the Atlas orography induces rainfall enhancement over the same zone. For the event of 20 October 1982, the latent heat release is again shown to be important, whereas the Atlas Mountains orography factor appears to inhibit rainfall. This is the first time that it has been documented that the Atlas-induced modulation of the surface pressure field is not a positive factor for heavy precipitations over eastern Spain. This exceptional case may be due to a negative interaction between the Atlas Mountains and the upper-level dynamics and frontal forcing for this event." @default.
- W2123838041 created "2016-06-24" @default.
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- W2123838041 date "2000-11-01" @default.
- W2123838041 modified "2023-09-29" @default.
- W2123838041 title "Mesoscale Numerical Study of Two Cases of Long-Lived Quasi-Stationary Convective Systems over Eastern Spain" @default.
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- W2123838041 doi "https://doi.org/10.1175/1520-0493(2001)129<3731:mnsotc>2.0.co;2" @default.
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