Public Storm Signal Warnings: Types, Effects on Society, and More

Storm Signal


A flag or cone that indicates the approach of a storm is an example of a storm signal. A storm warning, sometimes known as a “wholesale” warning, denotes winds of 48 winds or higher, or 48 to 63 winds (55 to 73 mph) in the event of a major rainstorm. Storm Alert Public To warn the people of impending weather violence, signals are raised.

When a storm signal is activated, the circumstances in the designated area change. These alerts, given out roughly 36 hours before a storm is expected to arrive, warn the public of possible risks to their lives and property. Cloud environment types represent various weather conditions. The temperature also informs us of impending warnings.

How Many Warning Signs Are Displayed To The Public?

The following advance times apply to the issuance of a public storm amplitude:

  • It is predicted that a weather disturbance will occur within 36 hours after Public Storm Warning Signal No. 1 is raised.
  • The weather disturbance is anticipated to occur within 24 hours of the Public Storm Warning Signal No. 2 being activated.
  • After Public Storm Warning Signal No. 3 is raised, the weather disturbance is predicted in 18 hours.
  • When Public Major Storm Warning No. 4 is activated, a meteorological disturbance is predicted to develop within 12 hours.

Public storm warnings could be enhanced or diminished as the meteorological disturbance passes across the Philippine Scope of Responsibility.

The intensity, area of circulation, predicted path, and velocity of the tropical storm or hurricane when the general storm warning signal is activated determines the signal number that will be issued for that location. The alteration of the Public Storm Protective Mechanism in a specific area is also controlled by alterations in the tropical cyclone’s strength, area of circulation, or motion.

Signal No. 1 for Public Storm Warning

Meteorological Conditions:

  • Tropical cyclones will cause harm to a region due to meteorological conditions.
  • It is desirable to have wind speeds between 30 and 60 kph.
  • It is possible to anticipate intermittent precipitation in a minimum of 36 hours. (A short turnaround time for the appearance of the storms will be mentioned in the warning advisory when the tropical storm approaches a location very closely.)

Influence of the Winds:

  • Wind effects include the possibility of tiny trees’ wigs and branches falling and the passing or changing of some plant leaves.
  • Some homes built with very light materials might be partially left exposed, and the environmental parameter might sustain little or no damage.
  • Rice crops that are in the blossoming stage could sustain severe harm.


  • This warning sign number may be raised as the tropical cyclone strengthens and approaches.
  • Waves in coastal seas could gradually build and develop.
  • The public is encouraged to listen to the most recent severe weather bulletin from PAGASA, released every six hours.
  • Emergency preparedness units are alerted; otherwise, the business may be continued as usual.

Signal No. 2 for Public Storm Warning

Meteorological Conditions:

  • A tropical cyclone will cause harm to a region due to meteorological conditions.
  • Winds more than 60 kilometers per hour and greater than 100 kilometers per hour may be anticipated at least in the next 24 hours.

The effects of the winds

  • Coconut trees could snap or fall at any time.
  • A few large trees might be uprooted.
  • Several banana plants might be uprooted.
  • The impact could be felt on rice and corn plantations.
  • Many homes constructed of light materials could be destroyed.
  • There is a possibility that an old galvanized iron roof will come off.
  • The exposed communities might generally expect minor to severe wind damage.


  • Little sea creatures should avoid the ocean and its surrounding waters.
  • In particular, as the hurricane approaches a location, it is essential to pay close attention to its current position, direction, speed, and severity.
  • The whole public is warned, especially by boat or air.
  • Children should temporarily cease their outdoor activities.
  • Before the signal enhancement, characteristics were fixed.
  • Agencies involved in disaster preparation are working to inform their communities.

Signal No. 3 for Public Storm Warning

Meteorological Conditions:

  • A tropical cyclone will develop in a specific location due to meteorological conditions.
  • Winds of at least 100 km and up to 185 kilometers an hour may be forecast in the next 18 hours.

The effects of the winds:

  • Many coconut trees could suffer damage or even be cut down.
  • Many trees could be damaged, or almost all fruiting trees could succumb to the elements.
  • Corn and rice crops could suffer significant losses.
  • Most homes made of light materials may lose their roofs or be destroyed. Light to medium design facilities can sustain significant damage, and electric power and communications services may be widely disrupted.
  • Generally speaking, there may be moderate to severe harm, particularly in the industrial and agricultural sectors.


  • The oceans and shoreline areas will be incredibly detrimental to all sea life.
  • The weather is harsh for the impacted populations.
  • People are compelled to seek protection in sturdy buildings, leave low-lying regions, and keep away from the beaches and river banks.
  • When the center of the typhoon strikes the town, do not leave the secure shelter because the severe weather will persist for another one to 2 hours with strong winds from the south.
  • Preventing and responding agencies/organizations operate with a suitable crisis or emergency.
  • Classes throughout all stages should be stopped, and kids should stay in the security of sturdy structures.

Signal No. 4 for Public Storm Warning

Meteorological Conditions:

  • There will be an impact on the region from a powerful storm.
  • In a minimum of 12 hours, heavy winds of far more than 185 kilometers per hour are possible.

Effect of Winds:

  • Coconut crops may sustain significant damage.
  • Damage to numerous giant trees is possible.
  • Rice and corn plantations could suffer significant losses.
  • Most mixed-construction homes, offices, and institutions may sustain significant damage.
  • Communication services could be severely affected, as well as electrical power.
  • Affected communities may sustain significant damage.


  • All travel and recreational activities should be postponed because the scenario could severely damage the community.
  • The transition to safer shelters ought to be finished.
  • As the center of the cyclone arrives, the weather will continue to deteriorate, and winds will pick up strength until they are at their strongest, usually emanating from the north.
  • When the area is under the eye of a typhoon, the weather will suddenly improve, and there will be mild winds; based on the eye’s width and motion speed, this good weather may persist for an extended time.

What do These Warning Signals mean?

Impact on schools:

In the case of a storm, all educational facilities will automatically cease operations. Preschool, elementary, and high school classrooms are all affected by this. Thirty-six hours before the anticipated arrival of a storm, public storm danger signs are released.

Residents are forewarned that the storm might bring strong winds up to 60 mph. In addition, they can stay inside and, if required, seek shelter in a building because wind can harm both homes and structures. Residents can get ready and relocate to temporary shelters during this period.

Impact on public institutions:

For protection to get ready, this signal is given out in plenty of time. People and businesses will begin looking for safer locations. Some governmental organizations will also occupy properties to serve as shelters.

Effect on emergency planning:

The Community Storm Warning Signal alerts the public to the impending storm. It is a vital tool that has contributed to saving numerous lives. It is first necessary to consider a few factors before PSWS can be applied. Managers in charge of emergencies must be aware of the hazards. They must also know the amounts required for handling crises. Both internal and external resources, such as regional police departments and public rescue services, must be considered.


From the discussion above, it is clear that wind storm signs aid in our comprehension of the time of impending storms. So that people relocate to secure locations and shield themselves from harm. Storms cause enormous losses, yet by maintaining a high level of alertness, we can avoid suffering severe harm.

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What are the general storm warning signs?

In the event of impending weather disruptions, public storm warnings are activated. A Storm Signal must still be perceived in the designated area after it has been raised.

How is a tropical hurricane’s signal number determined?

The strength, size of circulation, anticipated path, and velocity of the tropical storm or cyclone when the general storm danger sign is activated are used to determine the signal number for a particular area.

What kinds of warning signs are there?

Five different forms of public warning lights are available.