Rainfall for last quarter still 28% below normal
posted 13-Jan-2019  ·  
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The drought that led to the declaration of a state of calamity in Virac last year persisted until November, with only tropical depression “Usman” in late December bringing heavy rains that proved too much for the people of Catanduanes.

Records of the Philippine Atmospheric Geophysical and Astronomical Services Administration (PAGASA) at its Virac Synoptic Station in San Isidro Village, Virac showed that precipitation for October 2018 came up to 142.2 millimeters, 63% off the 523.3 mm volume recorded in the same year in 2017.

This slightly increased to 206.2 in November 2018, but still 33% short of the 329.2 mm posted in the same month in 2017.

Juan Pantino Jr., officer-in-charge of PAGASA Virac, told the Tribune that TD “Usman” and its subsequent downgrading into a low pressure area brought a total of 384.1 mm of rain on the island during the two day period on Dec. 28-29, 2018.

Assuming the same amount of rain fell on the entire 18-square kilometer territory of Virac, this volume would have been equivalent to 6.9 billion liters of water, enough to fill 2,760 Olympic-size swimming pools.

This prodigious amount of rain accounted for 67% of the total rainfall for December 2018 of 574.9 mm, but it is still 10% below the 641.7 mm precipitation for December 2017.

Interestingly, the maximum winds gusts generated by TD “Usman” at the PAGASA Virac weather station was just 11 meters per second or about 30 kilometers per hour, occurring at 5 A.M. of Dec. 28.

When it was downgraded to an LPA the following day, the wind gusts actually increased to 16 mps or 58 kph recorded at 11:12 A.M., the PAGASA weather observers noted.

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