Friday the 13th Hailstorm in the province of Bulacan, Philippines (13 August 2021): A Case Study
Generich H. Capuli

TL;DR
This case study analyzes the meteorological conditions and environmental factors that caused a severe hailstorm in Bulacan, Philippines, on August 13, 2021, using satellite data, reanalysis, and model soundings.
Contribution
It provides a detailed analysis of the atmospheric setup and processes leading to hail formation in this specific event, integrating multiple data sources and modeling techniques.
Findings
Warm inversion layer initially inhibited storm development.
Transition to an uncapped, unstable environment facilitated hail formation.
Weak low-pressure system contributed to low-level convergence and instability.
Abstract
This case study presents a thorough investigation of the environmental setup that led to the hail-producing severe storm that impacted the municipality of Norzagaray and City of San Jose Del Monte, including other nearby areas, in the province of Bulacan on the afternoon of August 13, 2021. During this period, 2-5 cm and potentially as large as 8 cm diameter hail was reported over these locations of Bulacan. For this purpose, the combination of HIMAWARI-8 AHI, PLDN and its flash counts, and meteorological indices; synoptic, thermodynamic, and kinematic indices, calculated from the ERA5 reanalysis are utilized to understand the nature of the hail event. In the morning, the pre-convective environment was comprised by a warm inversion layer that inhibited storm initiation, until the arrival of ample moisture and convective heating in the afternoon. By the afternoon, model sounding…
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Taxonomy
TopicsCruise Tourism Development and Management
