Department of Science and Technology
Philippine Atmospheric, Geophysical and
Astronomical Services Administration
Legend
Weather Icons
Clear Skies
Cloudy Skies with Rainshowers
Monsoon Rains
Partly Cloudy Skies
Partly Cloudy Skies With Isolated Rainshowers
Stormy
Cloudy Skies
Partly Cloudy Skies to at times cloudy with Rainshowers and Thunderstorms
Snow
Light Rains
Cloudy Skies with Rainshowers and Thunderstorms
Frost
Occasional Rains
Rains with Gusty Winds
Hail
Tropical Cyclone Warning Icons
Wind Signal Wind Threat Warning Lead Time
(Hours before
onset of wind threat) 		Potential Impacts


Strong winds

Beaufort 6-7


39-61 km/h

(22-33 kt, 10.8-17.1 m/s)

 36 hours
Minimal to minor threat to life and property

  • Houses of poor construction (e.g., wood frame, bamboo, makeshift), old dilapidated structures, and other structures made of light materials will suffer minimal to minor damage.
  • Some banana and similar plants are tilted, while twigs of small trees and shrubs may be damaged. Larger trees may sway with the wind. Rice crops, especially those in flowering and ripening stages, may suffer some damage.
  • Minimal disruption to public transportation.


Gale-force winds

Beaufort 8-9


62-88 km/h

(34-47 kt, 17.2-24.4 m/s)

24 hours
Minor to moderate threat to life and property

  • Minor to moderate damage may occur to makeshift or old dilapidated structures, and other structures made of light materials. Houses of poor and average construction (e.g., unreinforced CHB/masonry, mixed timber-CHB) may receive minor roof damage.
  • Unsecured, exposed lightweight items may become projectiles which may cause additional damage.
  • Some electrical wires may be blown down, resulting in local power outages.
  • Minor to moderate disruption to public transportation.
  • Most banana and similar plants are titled, with some stooped or downed. Some small trees blow over, with twigs and branches of frail trees broken. Considerable damage is likely to rice and other similar crops, especially those in flowering and ripening stages.


Storm-force winds

Beaufort 10-11


89-117 km/h

(48-63 kt, 24.5-32.6 m/s)

18 hours
Moderate to significant threat to life and property

  • Makeshift or old, dilapidated structures, and other structures made of light materials may suffer substantial damage. Houses of poor or average construction will have considerable roof damage, some blown-out windows, and/or partial wall damage. Well-constructed houses (e.g., reinforced CHB/pre-cast concrete, reinforced concrete moment frame) may suffer minimal to minor roof damage.
  • Warehouses and other building in industrial parks may suffer minor to moderate damage.
  • Unsecured, exposed outdoor items of light to moderate weight may become projectiles, causing additional damage or injuries.
  • Many areas may suffer power outages with numerous downed power lines and posts. Minimal to minor disruption in telecommunications and potable water supply.
  • Moderate to significant disruption to public transportation.
  • Some small trees, most banana and similar plants, and a few large trees are downed or broken. Rice and other similar crops, especially those in flowering and ripening stages may suffer heavy damage.


Typhoon-force winds

Beaufort 12


118-184 km/h

(64-99 kt, 32.7-51.2 m/s)

12 hours
Significant to severe threat to life and property

  • Severe damage will occur to makeshift or old, dilapidated structures, and other structures made of light materials. Houses of poor or average construction may receive major damage, including complete roof failure and possible wall collapse; a few may suffer severe damage.
  • Most well-constructed houses may suffer minor to moderate roof damage, with some houses experiencing major roof failure; blown out windows are also likely.
  • Failure of aluminum and steel roofs and coverings may occur in buildings at industrial parks.
  • Some glass in most high-rise office buildings may be blown out; a few of these buildings may have minor to moderate damage and higher proportion of blown-out windows due to swaying.
  • Considerable airborne debris will be generated and may cause damage, injury, and possible fatalities.
  • Near total loss of power supply and telecommunications due to numerous downed power lines, poles, and cellular towers. Diminished availability of potable water supply is also likely.
  • Significant to severe disruption to public transportation.
  • Significant damage to banana and similar plants. Most small trees and some large trees will be broken, defoliated, or uprooted. Almost total damage to rice and other crops.


Typhoon-force winds

Beaufort 12


185 km/h or higher

(100 kt or higher, 51.3 m/s or higher)

12 hours
Extreme threat to life and property

  • Severe to catastrophic damage is expected to houses of poor or average construction, makeshift or old, dilapidated structures, and other structures made of light materials. Well constructed houses may suffer substantial roof and wall failure or damage.
  • Many industrial buildings will be destroyed, with only few receiving partial roof and wall damage.
  • Most windows will be blown out in high-rise office buildings; Moderate structural damage is possible due to swaying.
  • Extensive damage will be caused by airborne debris. People, pets, and livestock exposed to the wind are at great risk of injury or death.
  • Electricity, potable water supply, and telecommunications will be unavailable for prolonged periods due to significant disruption in infrastructure.
  • Prolonged significant to severe disruption to public transportation.
  • Vast majority of the trees will be broken, defoliated, or uprooted. Banana and similar plants will be extensively damaged. Few trees, plants, and crops will survive.
Flood Advisory
Non-Telemetered River Basin
General Flood Advisory (GFA)

A General Flood Advisory is simplified flood bulletin issued for non-telemetered river basins whenever there is a significant amount of rainfall recorded based on past/current observation and the forecast rainfall from the numerical weather prediction models, satellite based information and estimates from radar. It is issued to the public on a regional basis through NDRRMC at 7:00am and 7:00pm

Telemetered River Basin

River Basins with fully automatic data transmission equipped with a telecommunication system.

Flood Bulletin

Flood forecast issued by the respective river basin centers like Pampanga, Agno, Bicol, Cagayan and Cagayan De Oro, prepared twice daily during floodwatch. Water level is monitored based on the assessment levels (Alert, Alarm and Critical) which means 40%, 60% and 100% of the river is full respectively.

Flood Warning Level
Flood Monitoring
Flood Alert
Flood Warning
Severe Flooding
Flood Warning Icons
Icon Description Forecast Action / Response
Flood Monitoring

Telemetered: Slow rise in water level but still below alarm level

Non-Telemetered: Monitor for possible flooding area

Telemeterd: Flood is possible

Non-Telemeterd: Light to Moderate Rainfall

Telemeterd:

Non-Telemeterd: Advised to take Precautionary Measures
Flood Alert

Telemetered: Water level is continuously rising but still below critical level

Non-Telemetered: Alert for possible flash floods and landslides

Telemeterd: Flood is threatening

Non-Telemeterd: Moderate to Heavy Rainfall

Telemeterd:

Non-Telemeterd: Advised to be alert for possible flood, flash flood and landslides
Flood Warning

Telemetered: Water level is above critical level

Non-Telemetered: Flood is occuring immediate action is recommended

Telemeterd: Flood is occuring

Non-Telemeterd: Heavy to Intense Rainfall

Telemeterd:

Non-Telemeterd: Advised to take appropriate action
Severe Flood Warning

Telemetered: Water level is continuously rising above critical level

Non-Telemetered: Flood is persisting force evacuation is recommended

Telemeterd: Flood is persisting

Non-Telemeterd: Intense to Torrential Rainfall

Telemeterd:

Non-Telemeterd: Advised to force evacuation
Final

Telemetered: Slow recession of water level

Non-Telemetered: Light rains

 Flood is no longer possible
Rainfall Warning Icons
Icon Description Forecast
Advisory

Community AWARENESS

 Flooding is POSSIBLE in low-lying areas and near river channels.
Alert

Community PREPAREDNESS

 Flooding is THREATHENING in low-lying areas and near river channels.
Emergency

Community RESPONSE

 SEVERE Flooding is EXPECTED. Take necessary precautionary measures.
Thunderstorm Warning Icons
Icon Description
Thunderstorm Advisory
  • This will be issued when there is an indication that a thunderstorm is threatening a specific area(s) within the next 2 hours.
  • Updates will be issued as frequent as necessary.
  • This will be disseminated via SMS, Social Media, and website.
Thunderstorm Watch
  • This will inform the public that TSTM formation is likely within the next twelve (12) hours.
  • This is more general than a warning.
  • This will be disseminated thru Social Media, and website.
Thunderstorm Information
  • Issued when TSTM is less likely within the next twelve (12) hours.
  • This will be disseminated thru Twitter, Facebook, and website.
General Classification of Structures(From United Nations Disaster Relief Organization UNDRO)
High-risk structures consist of old and densely built-up residential areas having light material structures and organic roof materials, squatter/slum areas, zone of mixed development, poor quality housing, warehouses, old, dilapidated structures, etc.
Medium-risk structures consist of older parts of city/town centers, timber structures/G.I. roofs and generally belong to the middle income group
Low-risk structures consist of concrete/framed structures, low-density population/housing and usually the modern part of the city/town