Análise Sinótica da Intensa Precipitação Observada no dia 11/09/2002 em Santa Maria, RS

Everson Dal Piva Dal Piva

Abstract


This article analyzes the intense rainfall observed in the morningof 11 September 2002 in Santa Maria, located in central region of Rio Grandedo Sul State. Regional reanalysis from CPTEC/INPE, satellite images andsimulation data with BRAMS were used. The strong rainfall was generatedby prefrontal convection, triggered by the approach of a cold front,associated with an extratropical cyclone located over the southern tip ofSouth America, and supplied by moisture from amazon basin. Relevantmeteorological parameters indicate that the storm that reached Santa Mariamay have been a supercell, a system that triggers most of the tornadoesaround the world. The simulation with regional model presented similaritiesand divergences with respect to the observation. Among the similarities:onset of the convection around 1700UTC in the Brazil-Argentina border;propagation of this convection southeastward towards the center of theRio Grande do Sul State; and formation of new cells towards Argentina.Among the divergences: the simulation showed that the precipitation wasmore spatially concentrated than observed; the model tends to generatemore precipitation in the bottom of the valleys; and the propagation of theconvection northwestward towards Paraguay was slower than observed.



DOI: https://doi.org/10.5902/2179460X9807

Copyright (c)



Creative Commons License

This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

 

DEAR AUTHORS,

PLEASE, CHECK CAREFULLY BEFORE YOUR SUBMISSION:

1. IF ALL AUTHORS "METADATA" (ORCID, LINK TO LATTES, SHORT BIOGRAPHY, AFFILIATION) WERE ADDED,

2. THE CORRECT IDIOM YOUR SECTION,

3 IF THE HIGHLIGHTS WERE ADDED,

4. IF THE GRAPHIC ABSTRACTS WAS ADDED,

5. IF THE REVIEWERS INDICATION WAS DONE,

6. IF THE REFERENCES FORMAT ARE CORRECT(ABNT)

7. IF THE RESOLUTION YOUR FIGURES (600 DPI) ARE SUITABLE

8.  IF THE STATEMENT BY THE ETHICS COMMITTEE (IF IT INVOLVES HUMANS) WAS ADDED;

9. IF THE DECLARATION OF ORIGINALITY WAS ADDED.

10. IF THE TEXT IS ORIGINAL. IF THE IDEA HAS ALREADY BEEN REGISTERED IN SUMMARY FORM, OR PUBLISHED IN CONGRESS ANNUALS, PLEASE INFORM THE EDITOR.