Logo
Print

Weather Advisory

SEVERE WEATHER BULLETIN

Tropical Cyclone Alert

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.

Tropical Cyclone Warning



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:

DAMAGE TO VEGETATION:


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:

DAMAGE TO VEGETATION:


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:

DAMAGE TO VEGETATION:

 


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: DAMAGE TO VEGETATION:

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:

DAMAGE TO VEGETATION:




 

Rainfall Warning

 

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

                                                                                      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

 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

Cloud Description

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.

Precipitation Rain & Rainshowers) Description

1. Rains

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

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 Description (Based from the Beaufort Wind Scale and the Saffir-Simpson Scale

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

Sea Condition as affected by Wind Force (based from the Beaufort Wind Scale

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.