Monday, August 6, 2012

PAGASA RED Signal - HABAGAT bring 80% of ONDOY'S Rain Volume

Aerial Photograph of Bulacan Flooding caused by PAGASA HABAGAT Weather Disturbance - August 8, 2012
There is no typhoon but it's flooding everywhere. I woke up at 5:55am and streets are flooded, news at radio and television are reporting rampant flooding in different areas of NCR and other parts of Luzon.

Classes and government offices are suspended, a lot of jeeps, buses and commuters are stranded. Last night before I slept, PAGASA issue a RED warning signal in NCR and what did they mean by that?

As of this writing, NCR is still on RED warning signal alert which means that rainfall volume can reach 30+ mm per hour and will cause flooding to low lying areas and landslides. This is cause by Habagat weather system that are strengthen by Typhoon HAIKUI which is currently outside Philippine Area of Responsibility (PAR).

HABAGAT Deaths/Casualties and Affected Population

Reported Habagat deaths and affected municipalities and families by NDRRMC as of August 17, 2012

Municipalities: 175
Deaths/Casualties: 109 dead
Injured: 14 persons
Missing:  4 persons
Affected Families: 934,285 / 4,236,151 persons

ONDOY vs. HABAGAT Rain Volume Comparison

ONDOY Rainfall Volume in 24 hours (in 2009) = 455mm

From 8am August 6 to 8am August 7, 2012
HABAGAT Rainfall Volume = 323.4mm - 70% of ONDOY

From 8am August 7 to 8am August 8, 2012
HABAGAT Rainfall Volume = 363.7mm - 80% of ONDOY

Total Rain Volume in 2 days = 687.1mm

Habagat brought 70-80% of rain volume comparing to Typhoon ONDOY in 24 hours and that's a lot of rain in a short period of time. Typhoon ONDOY in September 2009 brought massive flooding and deaths and became a benchmark in flood level and rainfall volume forecast.

With 80% of rainfall volume of previous typhoon ONDOY and a total of 687.1mm in 2 days, there is no doubt that massive flooding cause havoc in NCR and other parts of Luzon.

To continuously monitor rain probability and rainfall volume in the past hour in your area visit DOST Project NOAH. You can also access weather disturbances detected by Doppler radar using this monitoring site.

Yahoo News

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