Gale Warning
Issued at: 5:00 PM TODAY , 09 December 2019
Gale Warning # 30
For: strong to gale force winds associated with the surge of the northeast monsoon

Gale Warning in PDF file



Weather Advisory
Issued at: 10:00 AM 2019 December 09
Weather Advisory in PDF file




General Flood Advisories - Regional
 General Flood Advisory issued as of 7 PM, 20 August 2018



Advisories


Monthly Climate Assessment and Outlook (July-August 2018)

Issued: 06 August 2018

Monthly Rainfall Forecast
RAINFALL FORECAST  (September 2018 - February 2019) 
UPDATED: 29 August 2018 (next update September 26, 2018)


Regional Rainfall Forecast
Issued: 29 August 2018
Valid for: September 2018 - February 2019
Farm Weather Forecast and Advisories
ISSUED: 8 AM,  FRIDAY,  MAY 24, 2019
VALID UNTIL: 8 AM,  SATURDAY, MAY 25
, 2019
FWFA:  N0. 19-144

Ten-Day Regional Agri-Weather Information
DEKAD NO. 15   MAY 21 - 31, 2019
PHILIPPINE AGRI-WEATHER FORECAST
The weather systems that will affect the whole country are the frontal system, easterlies, ridge of high pressure area, intertropical convergence zone (ITCZ) and low pressure area (LPA).

Seasonal Climate Outlook
Issued:  13 July 2018
FOR July - December 2018
PDF 




Astronomical Diary
Issue for October 2018
The October Orionids meteor shower will be active from October 17-25, 2017.




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  • General information on tropical cyclone or other severe weather systems such as the southwest monsoon, Low Pressure Area (LPA) and other weather system that will cause floods/flashfloods and landslides
  • For monsoons, low pressure area and other severe weather systems, it describes the expected weather condition in affected areas and its duration
  • For tropical cyclones that does not pose threat to any part of the country for the next 3 to 4 days, it provides additional details such as the maximum sustained winds, movement and forecast positions in the next 72 hours.
  • Issued once a day - 11:00 AM unless significant changes occurred in the weather scenario.

SEVERE WEATHER BULLETIN

  • A tropical cyclone either enters or develops in the PAR and has an impending threat to any part of the country.
  • No public storm warning signal is in effect in any part of the country.
  • Its content is similar to an advisory, however, the frequency of issuance of the alert bulletin shall be twice a day, at 11 AM and 11 PM.

What to do:

The people are advised to monitor for the latest weather bulletin issued by PAGASA every 12 hours. In the meantime, business may be carried out as usual.

  • An upgrade from Tropical Cyclone Alert since the tropical cyclone poses real threat to any part of the country.
  • Public storm warning signal is in effect in any part of the country.
  • The Public Storm Warning Signal is based on the wind intensity.
  • The frequency of issuance is four times a day, at 5 AM, 11 AM, 5PM  and 11 PM.


WINDS: 30-60 kph may be expected in at least 36 hr
SEA CONDITIONS (Open Sea)
Wave Height: 1.25-4.0 meters

DAMAGE TO STRUCTURE:

  • Very light or no damage to high risk structures,
  • Light to medium and low risk structures
  • Slight damage to some houses of very light materials or makeshift structures in exposed communities.

DAMAGE TO VEGETATION:

  • Some banana plants are tilted, a few downed and leaves are generally damaged
  • Twigs of small trees may be broken.
  • Rice crops, however, may suffer significant damage when it is in its flowering stage.


WINDS: 61-120 kph may be expected in at least 24 hr
SEA CONDITIONS (Open Sea)
Wave Height:4.1-14.0 m
Storm surge possible at coastal areas.

DAMAGE TO STRUCTURE:

  • Light to Moderate damageto high risk structures;
  • Very light to light damageto medium-risk structures;
  • No damageto very light damageto low risk structures
  • Unshielded, old dilapidated schoolhouses, makeshift shanties, and other structures of light materials are partially damaged or unroofed.
  • Some old galvanized iron (G.I.) roofs may be peeled or blown off.
  • Some wooden, old electric posts are tilted or downed.
  • Some damage to poorly constructed signs/billboards.

DAMAGE TO VEGETATION:

  • Most banana plants, a few mango trees, ipil-ipiland similar trees are downed or broken.
  • Some coconut trees may be tilted with few others broken.
  • Rice and corn may be adversely affected.
  • Considerable damage to shrubbery and trees with some heavy-foliaged trees blown down.


WINDS: 121-170 kph may be expected in at least 18 hr
SEA CONDITIONS (Open Sea)
Wave Height: > 14.0 meters
Storm surge possible at coastal.

DAMAGE TO STRUCTURE:

  • Heavy damageto high–risk structures;
  • Moderate damageto medium-risk structures;
  • Light damageto low-risk structures
  • Increasing damage to old, dilapidated residential structures and houses of light materials (up to 50% in a community)
  • Houses of medium strength materials (old, timber or mixed timber-CHB structures, usually with G.I. roofings), some warehouses or bodega-type structures are unroofed,

DAMAGE TO VEGETATION:

  • Almost all banana plants are downed, some big trees (acacia, mango, etc.) are broken or uprooted,
  • Dwarf-type or hybrid coconut trees are tilted or downed
  • Considerable damage to shrubbery and trees with heavy foliage blown off; some large trees blown down.

 


WINDS: 171-220 kph may be expected in at least 12 hr
SEA CONDITIONS (Open Sea)
Wave Height: more than 14.0 meters
Storm surge 2-3m possible at coastal areas.

DAMAGE TO STRUCTURE:
  • Very heavy damageto high –risk structures.
  • Heavy damageto medium risk structures;
  • Moderate damageto low-risk structures
  • Considerable damage to structures of light materials (up to 75% are totally and partially destroyed); complete roof structure failures.
  • Many houses of medium-built materials are unroofed, some with collapsed walls; extensive damage to doors and windows
  • A few houses of first-class materials are partially damaged
  • All signs/billboards are blown down.
DAMAGE TO VEGETATION:
  • There is almost total damage to banana plantation,
  • Most mango trees, ipil-ipiland similar types of large trees are downed or broken.
  • Coconut plantation may suffer extensive damage.
  • Rice and corn plantation may suffer severe losses.

PSWS no 5
WINDS:
 > 220 kph may be expected in at least 12 hr
A Super Typhoon will affect the locality.

SEA CONDITIONS (Open Sea)
Wave Height: more than 14.0 m
Storm surge more than 3 meters possible at coastal areas

DAMAGE TO STRUCTURE:

  • Widespread damageto high-risk structures
  • Very heavy damageto medium-risk structures
  • Heavy damageto low-risk structures;
  • Almost total damage to structures of light in highly exposed coastal areas.
  • Complete roof failure on many residences and industrial buildings. Severe and extensive window and door damage
  • Most residential and institutional buildings of mixed construction may be severely damaged.
  • Electrical power distribution and communication services severely disrupted.
  • All signs/billboards blown

DAMAGE TO VEGETATION:

  • Total damage to banana plantation
  • Most tall trees are broken, uprooted or defoliated;
  • Coconut trees are stooped, broken or uprooted.
  • Few plants and trees survived






 

 

RAINFALL WARNING
 yellow
ADVISORY
Community AWARENESS
FLOODING 
is POSSIBLE in low-lying areas
and near river channels 

orangeALERT  Community PREPAREDNESS
FLOODING 
is THREATHENING in low-lying areas
and near river channels 

redEMERGENCY Community RESPONSE
SEVERE FLOODING 
is EXPECTED 
Take necessary precautionary measures

 

                                                                                      THUNDERSTORM WARNINGS
   warning 
 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, website

  watch 
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, website
  info 
Thunderstorm

 Information

  • Issued when TSTM is less likely within the next twelve (12) hours.
  • This will be disseminated thru Twitter, Facebook, website
 WEATHER ICONS 
Sunny Clear Skies
Cloudy skies Cloudy Skies
Cloudy skies with rainshowers Cloudy Skies with rainshower
Cloudy skies with rainshowers and thunderstorm Cloudy skies with rainshower and thunderstorm
Light rains Light rains
Monsoon Rains Monsoon rains/ Rains
Ocassional Rains Occasional Rains
Partly cloudy skies Partly Cloudy Skies
Partly cloudy skies to at times cloudy with rainshowers or thunderstorm Partly Cloudy to at times cloudy with rainshowers
and/or thunderstorm
Partly cloudy skies with isolated rainshowers Partly Cloudy to at times Cloudy with rainshowers
Rains with Gusty winds Rains with gusty wind
Stormy Stormy
Snowy Snowy
SKY CONDITION

DEFINITION/DESCRIPTION

Clear or Sunny Skies
  • State of the sky when it is cloudless, totally clear or with a few small light clouds visible.
  • Has a total cloud cover of less than one okta.
Partly Cloudy
  • State of the sky is within 2-5 oktas total cloud cover or has between 30% to 70% cover of the celestial dome.
Partly Cloudy to at Times Cloudy
  • Mostly partly cloudy but there are times when more than 70% of the celestial dome is covered with clouds.
Mostly or Mainly Cloudy
  • The sky is mostly covered with clouds but with possible brief periods of sunshine.
  • The total cloud cover is between 6 to 8 oktas.
Cloudy
  • The sky is covered with clouds between 6 to 8 oktas or has more than 70% cloud cover.
  • Predominantly more clouds than clear sky.
  • For a longer period during the day, the sun is obscured by clouds.
Overcast
  • The sky is totally or completely covered with thick and opaque clouds, 8 oktas or around 100% cloud cover.

1. Rains

  • Overcast sky with continuous or steady precipitation that may last several hours.
  • Has a water droplets of 0.5 mm or greater in size but if widely scattered the drops may be smaller.
  • Associated with meso-scale (synoptic) system or macro-scale (large scale) system like TC's, Easterly Waves, Monsoons, Fronts and ITCZ.
RAIN CLASSIFICATION

DEFINITION/DESCRIPTION

Very Light Rains
  • Scattered drops that do not completely wet an exposed surface regardless of duration.
Light Rains
  • The rate of fall is from trace to 2.5 mm per hour.
  • Individual drops easily identified and puddles(small muddy pools) form slowly.
  • Small streams may flow in gutters.
Moderate Rains
  • The rate of fall is between 2.5 mm to 7.5 mm per hour.
  • Puddles rapidly forming and down pipes flowing freely.
Heavy Rains
  • The rate of fall is greater than 7.5 mm per hour.
  • The sky is overcast, there is a continuous precipitation.
  • Falls in sheets, misty spray over hard surfaces.
  • May cause roaring noise on roofs.
Monsoon Rains Other Descriptions:
  • Heavy and continuous precipitation attributed to either the Southwest or Northeast Monsoon.
Occasional Rains
  • Not frequent but is recurrent precipitation.
Widespread Rains
  • Precipitation occuring extensively throughout an area.
Frequent rains
  • Precipitation occuring regularly and often throughout the time duration.
Intermittent Rains
  • Precipitation which ceases at times and re-occur again.

2. Rainshowers

  • Precipitation of short duration but usually of greater intensity from convective clouds(primarily cumulus or cumulonimbus)
  • Characterized by sudden start and sudden end of precipitation, rapid change in intensity.
RAINSHOWERS

DEFINITION/DESCRIPTION

Scattered Rainshowers
  • The rain-bearing clouds is distributed spatially resulting to rainshowers occuring to the bigger part of the forecasted area.
Isolated Rainshowers
  • The rain-bearing clouds is small and isolated resulting to rainshowers occuring only to a small part of the forecasted area.
Occasional Rainshowers
  • There is a large amount of convective clouds and precipitation occur in most parts of the forecasted area occasionally, and varying in rainfall amount.
Squally Rainshowers
  • Showers accompanied by brief but sudden strong or gale force winds.
WIND DESCRIPTIONUNITS in KPHUNITS in KNOTSDESCRIPTION AS OBSERVED
Light Winds 19 or less 10 or less
  • Wind felt on face.
  • Ordinary wind vanes moved by wind.
  • Leaves rustle.
Moderate Winds 20-29 11-16
  • Wind raises dust and loose paper.
  • Small branches are moved.
Moderate to Occasionally Strong    
  • Moderate winds mostly persist but there are instances during the forecast period that it reaches strong wind force.
Fresh Winds* 30-39 17-21
  • Small trees in leaf begin to sway.
  • Crested wavelets appear on inland waters.
 Strong Winds 40-50 22-27
  • Large branches in motion.
  • Whistling heard in telephone wires.
  • Umbrellas used with difficulty.
Gale:
  1. Near Gale*

  2. Gale

  3. Strong Gale*



51-62

63-75

76-87



28-33

34-40

41-47

  • Whole trees in motion.
  • Inconvenience felt when walking against wind.
  • Twigs break off road.
  • Cars veer on road.
  • Larger branches break off.
  • Slight structural damade occurs-roofing dislodged.
Stormy:
1 Storm

2 Violent Storm*

3 Typhoon*

 

88-102

103-117

118 or more

 

48-55

53-63

64 or more

  • Trees uprooted.
  • Considerable structural damage.
  • Widespread damage.
  • Widespread damage.

            * Terms that are not normally used by meteorological centers in forecasts formulation and communication

             Gust - any sudden brief increase of wind speed usually less than 20 seconds followed by a lull or slackening in wind speed

WIND FORCEUNITS in (MPS)UNITS in (KTS)WAVE HT.(METERS)SEA CONDITION
 Calm 0-1.5 0-3.0 0.1
  • Ripples with the appearance of scales are formed but without foam crests.
 Smooth 1.5-4.0 3.0-8.0 0.1-0.5
  • Small wavelets, still short but more pronounced.
  • Crest have glassy appearance and do not break.
 Slight 4.0-8.0 8.0-16.0 0.5-1.25
  • Small waves, becoming longer.
  • Fairly frequent white horses.
 Moderate 8.0-11.0 16.0-22.0 1.25-2.5
  • Moderate waves taking a more pronounced long form.
  • Many white horses are formed-a change of some spray.
 Rough 11.0-16.0 22.0-32.0 2.5-4.0
  • Large waves begin to form.
  • Sea heaps up and white foam from breaking waves begin to be blown in streaks along the direction of wind.
 Very Rough 16.0-20.0 32.0-40.0 4.0-6.0
  • Moderately high waves of greater length.
  • Edges of crest begin to break into spindrift.
  • Foam is blown in well-mark streaks along the direction of the wind.
 High 20.0-26.0 40.0-52.0 6.0-9.0
  • High to very high waves with long overhanging crests.
  • The surface of the sea takes on white appearance.
  • The thumbling of the sea becomes heavy with visibility affected.
 Very High 26.0-34.0 52.0-68.0 9.0-14.0
  • Exeptionally high waves.
  • Small and medium size ships occasionally lost from view behind waves.
  • The sea is completely covered with long white patches of foam.
  • The edges of wave crest are blown into froth.
 Phenomenal >34.0 >68.0 >14.0
  • The air is completely filled with foam and spray.
  • Sea completely white with driving spray.
  • Visibility very seriously affected.

 


PUBLIC WARNING 


It has come to the attention of the Office of the Administrator of PAGASA that a certain person has been using the name of Dr. Vicente B. Malano to solicit money from the contractors of PAGASA.

Dr. Malano wishes to inform the public that he has not authorized anyone to solicit money on his behalf and to warn everyone against dealing with unscrupulous activities of certain individuals.





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List of Trainees for the Meteorological Technicians Training Course (MTTC) 2019

The following have been accepted to undergo the Meteorological Technicians Training Course (MTTC), scheduled on 06 May – 14 October 2019

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Weather Division is now  ISO 9001:2015 Certified

Proof has been furnished by means of an audit that the requirements of ISO 9001:2015 are met.

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14 June 2019

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