Explain the 2010 reporting gap in SWAP severe weather records

Determine the underlying reasons for the difficulty in locating and verifying reports of severe weather events (tornadoes, hail, and waterspouts) in the Philippines for the year 2010 within the Project Severe Weather Archive of the Philippines (SWAP), distinguishing whether the paucity of records reflects a genuinely low occurrence or deficiencies in documentation, reporting, or data access.

Background

In discussing temporal biases and underreporting, the authors note sharp variations in the number of archived events across years, with notably low counts in 2010 and 2016. They attribute the 2016 anomaly partly to the prominence of the Manila Tornado event overshadowing other reports but explicitly express uncertainty about 2010.

Understanding whether the 2010 shortfall is due to reporting and archival limitations or a real climatological lull is important for interpreting long-term trends derived from the SWAP dataset.