RESUMODados de focos de calor via satélites ambientais, de Sistemas Frontais (SF) e Zona de Convergência do Atlântico Sul (ZCAS), juntamente com o Standardized Precipitation Index (SPI) e os Relatórios de Ocorrência de Incêndios (ROI) no Parque Nacional do Itatiaia (PNI) foram avaliados. O SPI foi calculado com dados pluviométricos de três estações no PNI. Os dados dos SF e ZCAS foram obtidos via Climanálise. A regressão múltipla foi aplicada a ROI, SPI, SF e ZCAS de forma independente. A maior categoria do ROI ocorreu na classe C (81%), sendo os maiores percentuais no inverno (57,2%) e primavera (35,1%). Os meses críticos de focos de calor foram julho (17%), setembro (23,2%) e agosto (31,9%). Independente da estação, o SF (R2 = 0,75) se sobressaiu em relação a ZCAS (R2 = 0,43). O SF condiciona 80% das variações entre ROI e índice SPI anual, enquanto a ZCAS em apenas 40%.Palavras-chaves: sistemas produtores de chuva, incêndios florestais, índice de seca. Relationship Between Standardized Precipitation Index (SPI) and the FireOccurrence Reports (FOR) in Itatiaia National Park ABSTRACTWe evaluated fire foci data via environmental satellites, from Frontal Systems (FS) and South Atlantic Convergence Zone (SACZ) together with Standardized Precipitation Index (SPI) and Fire Occurrence Reports (FOR) in Itatiaia National Park (INP). SPI were computed with rainfall data from three stations in INP. SF and SACZ data were obtained via Climanálise. We applied independent multiple regression to FOR, SPI, SF and SACZ. Largest FOR occurred category in C class (81%), highest percentages during winter (57.2%) and spring (35.1%). The critical months to fire foci were July (17%), September (23.2%) and August (31.9%). Regardless of the season, FS (R 2 = 0.75) were highlighted to SACZ (R 2 = 0.43). SF conditioned 80% of variations between FOR and annual SPI index, while only 40% were due to SACZ.
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