Shear Line and Northeast Monsoon to Bring Cloudy Skies and Scattered Rains Across Parts of the Philippines

Overview: Two Weather Systems Shaping Today’s Conditions

Cloud cover and rain are set to affect wide sections of the Philippines as two key weather patterns influence the country: the Shear Line and the Northeast Monsoon, locally known as amihan. The Shear Line is expected to bring cloudy skies with scattered rains and isolated thunderstorms over parts of the Visayas and nearby areas. Meanwhile, the Northeast Monsoon will be felt across much of Luzon, generally producing cloudy skies and light rains in several locations.

As of 2 a.m., there are no Low Pressure Areas (LPA) being monitored for tropical cyclone formation. Even without an LPA, the forecast highlights that rainfall from the Shear Line and thunderstorms in some areas can still trigger hazards such as flash floods and landslides, particularly where rain becomes moderate to heavy or thunderstorms turn severe.

Areas Affected by the Shear Line: Visayas and Nearby Provinces

The Shear Line is forecast to affect the Visayas, bringing more persistent cloudiness and a higher chance of rain compared with other parts of the country. Several provinces and island groups are specifically expected to experience cloudy skies with scattered rains and isolated thunderstorms due to this weather system.

Under the Shear Line forecast, the following areas are expected to have cloudy skies with scattered rains and isolated thunderstorms:

• Visayas
• Albay
• Sorsogon
• Masbate
• Dinagat Islands

Because rainfall linked to the Shear Line can be moderate to heavy at times, the forecast includes a warning that flash floods and landslides may occur in these areas. Residents in flood-prone communities and locations near slopes or mountainous terrain may need to stay alert, especially during heavier bursts of rain or during thunderstorms.

Northeast Monsoon (Amihan): Cloudy Skies and Light Rains Over Luzon

While the Shear Line influences the Visayas, the Northeast Monsoon is expected to affect large parts of Luzon. The monsoon pattern typically brings cooler winds from the northeast, and in this forecast it is associated mainly with cloudy skies and light rains across several regions.

For the following areas, the outlook calls for cloudy skies with light rains due to the Northeast Monsoon, with no significant impact expected:

• Cagayan Valley
• Cordillera Administrative Region
• Central Luzon
• The rest of the Bicol Region (outside the areas directly cited under the Shear Line)
• Quezon

In addition, Metro Manila and the rest of Luzon are expected to experience partly cloudy to cloudy skies with isolated light rains, also due to the Northeast Monsoon. The forecast similarly notes no significant impact for these areas, indicating that rainfall is expected to be generally light and intermittent rather than prolonged or intense.

Mindanao: Localized Thunderstorms May Bring Isolated Showers

For areas outside the direct influence of the Shear Line and the Northeast Monsoon, localized weather remains a key factor. In Mindanao, the forecast points to partly cloudy to cloudy skies with isolated rain showers or thunderstorms due to localized thunderstorms.

Even when rain is described as “isolated,” thunderstorms can still produce intense downpours over short periods. The forecast specifically notes that flash floods and landslides may occur due to severe thunderstorms in parts of Mindanao. Conditions can change quickly during thunderstorm events, making it important for communities to remain attentive to weather developments.

Rainfall Impacts: Where Flooding and Landslide Risks Are Highlighted

The forecast identifies two main rainfall-related risk scenarios:

• Moderate to heavy rains from the Shear Line may lead to flash floods and landslides, particularly in the Visayas and the provinces and island groups listed under the Shear Line-affected areas.
• Severe thunderstorms in Mindanao may also trigger flash floods and landslides, even if rainfall is localized.

These hazards are typically more likely in places with poor drainage, low-lying communities near waterways, and areas near steep slopes. While the forecast does not specify exact rainfall totals or durations, it emphasizes that the intensity of rain—whether from the Shear Line or thunderstorms—can be enough to create dangerous conditions in vulnerable locations.

Wind and Coastal Water Conditions: Strong to Gale Winds in Some Eastern Sections

Beyond rainfall, the forecast also details wind strength and coastal water conditions, which are particularly important for coastal communities, small craft operators, and those traveling by sea.

The eastern sections of Central and Southern Luzon and the Visayas are expected to experience strong to gale wind speeds moving northeastward. These stronger winds are paired with rough to very rough coastal waters, which can make sea travel difficult and potentially hazardous.

In another tier of conditions, the rest of Luzon and the eastern section of Mindanao are forecast to have moderate to strong wind speeds, also moving northeastward. Coastal waters in these areas are expected to range from moderate to rough.

For the rest of the country, winds are expected to be lighter overall. The outlook calls for light to moderate wind speeds moving northeastward, with slight to moderate coastal waters.

Regional Breakdown of Wind and Sea Conditions

To summarize the wind and coastal water forecast by area:

• Eastern sections of Central and Southern Luzon, and Visayas: Strong to gale winds (northeastward) with rough to very rough coastal waters.
• Rest of Luzon, and eastern section of Mindanao: Moderate to strong winds (northeastward) with moderate to rough coastal waters.
• Rest of the country: Light to moderate winds (northeastward) with slight to moderate coastal waters.

These conditions matter not only for maritime travel but also for coastal activities. Rougher seas can affect fishing operations, ferry schedules, and other forms of sea transport. Strong winds can also contribute to choppy coastal conditions and reduced comfort for travelers on exposed routes.

Sky Conditions by Major Area

Across the country, the sky condition forecast varies by region and by the dominant weather driver:

• Visayas, Albay, Sorsogon, Masbate, Dinagat Islands: Cloudy skies with scattered rains and isolated thunderstorms due to the Shear Line.
• Cagayan Valley, Cordillera Administrative Region, Central Luzon, rest of Bicol Region, Quezon: Cloudy skies with light rains due to the Northeast Monsoon, with no significant impact expected.
• Metro Manila and the rest of Luzon: Partly cloudy to cloudy skies with isolated light rains due to the Northeast Monsoon, with no significant impact expected.
• Rest of Mindanao: Partly cloudy to cloudy skies with isolated rain showers or thunderstorms due to localized thunderstorms.

This mix of conditions suggests that while some areas will see more frequent or heavier rain, others may experience only brief or isolated showers. Still, localized downpours—especially from thunderstorms—can be disruptive even when broader regional impacts are considered limited.

Daylight Timing: Sunrise and Sunset

For those planning travel, work, or outdoor activities, the forecast also includes the day’s sunrise and sunset times:

• Sunrise: 6:22 a.m.
• Sunset: 5:59 p.m.

With cloud cover expected in many areas, daylight conditions may feel dimmer at times, particularly in places experiencing thicker clouds and rain bands. For commuters and drivers, reduced visibility can occur during heavier showers and thunderstorms.

What This Means for Travel and Daily Plans

The forecast points to a day where weather planning depends heavily on location. In the Visayas and nearby provinces affected by the Shear Line, periods of rain and thunderstorms may be more frequent, and the risk of flash floods and landslides is specifically flagged where moderate to heavy rain occurs. In many parts of Luzon, the Northeast Monsoon is expected to bring mostly light rains and cloudiness, with the forecast noting no significant impact. Meanwhile, parts of Mindanao may see isolated thunderstorms that can still turn severe and bring localized hazards.

For coastal and sea travel, the wind and wave outlook is a key consideration. Strong to gale winds and rough to very rough seas are expected in the eastern sections of Central and Southern Luzon and in the Visayas. Moderate to strong winds and moderate to rough seas are expected in the rest of Luzon and the eastern section of Mindanao. Elsewhere, conditions are forecast to be calmer, with lighter winds and slight to moderate coastal waters.

Key Points at a Glance

• The Shear Line is expected to affect the Visayas and several nearby areas, bringing cloudy skies, scattered rains, and isolated thunderstorms.
• Flash floods and landslides may occur in Shear Line-affected areas due to moderate to heavy rains.
• The Northeast Monsoon will influence much of Luzon, bringing cloudy skies and generally light rains, with no significant impact expected in the forecast.
• Mindanao may experience isolated rain showers or thunderstorms due to localized thunderstorms; severe thunderstorms may cause flash floods and landslides.
• Strong to gale winds and rough to very rough seas are expected in the eastern sections of Central and Southern Luzon and the Visayas.
• Sunrise is at 6:22 a.m., and sunset is at 5:59 p.m.

Overall, the forecast underscores that even without an active low pressure area being monitored for tropical cyclone formation, routine seasonal patterns and localized thunderstorms can still bring rain, gusty winds, and hazardous sea conditions in specific regions. Monitoring local conditions remains important, especially in areas highlighted for heavier rainfall or rougher coastal waters.