The Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) has issued multiple thunderstorm advisories and heavy rainfall warnings across large swathes of Luzon, placing millions under heightened alert for flash floods and landslides. These urgent warnings, which commenced late on Wednesday, July 1, and extended into the early hours of Thursday, July 2, signal a period of intense and potentially dangerous weather conditions driven by the recent formation of Tropical Depression Henry and an intensified southwest monsoon, locally known as Habagat.
This confluence of powerful weather systems poses significant, immediate risks to the Philippines’ most populous island, threatening densely populated urban centers, sprawling agricultural plains, and vulnerable mountainous terrains. From the bustling metropolis of Manila to critical food-producing regions and coastal communities, residents are now compelled to take urgent precautions as volatile conditions are projected to persist, potentially leading to widespread disruption, infrastructural damage, and direct threats to life and property.
In Northern Luzon, PAGASA’s advisories have put residents of Ilocos Norte on a specific watch. An advisory issued at 10:00 PM on July 1 indicated a high likelihood of thunderstorms developing within the subsequent 12 hours. This localized warning sits within a broader regional forecast predicting partly cloudy to cloudy skies, punctuated by isolated rain showers and thunderstorms across the northern provinces, underscoring the dynamic nature of atmospheric disturbances even in areas not directly under heavier warnings.
More immediately impactful are the warnings stretching across Central and Southern Luzon, including the expansive Greater Metro Manila Area. PAGASA’s Thunderstorm Advisory No. 8, disseminated at 12:05 AM on July 2, detailed expectations of moderate to heavy rain showers, accompanied by lightning and strong winds, over parts of Nueva Ecija, Bulacan, Rizal, and Laguna. These hazardous conditions were already being experienced in specific areas of Quezon province, with the state weather bureau projecting their persistence for at least two hours and a high likelihood of affecting neighboring localities as the system tracks across the region.
This latest advisory followed Thunderstorm Advisory No. 7, issued earlier at 10:20 PM on July 1, which had similarly cautioned residents about moderate to heavy rain showers, lightning, and strong winds over other towns in Quezon and Nueva Ecija. The continuous, rapidly evolving nature of these advisories underscores the need for constant vigilance. The Greater Metro Manila Area, encompassing Metro Manila itself, along with Bulacan, Rizal, Laguna, and Cavite, faces a heightened likelihood of thunderstorm development within the next 12 hours, a forecast that holds profound implications for daily commutes and urban routines.
The primary meteorological force behind this escalating rainfall is Tropical Depression Henry, which PAGASA reported formed around 2 AM on Wednesday, July 1. This developing tropical cyclone is actively enhancing the southwest monsoon, funneling significant moisture and creating atmospheric instability across the entire Philippine archipelago. Its influence extends far beyond its direct path, significantly intensifying the Habagat's capacity to deliver heavy and sustained rainfall.
As of recent reports, Tropical Depression Henry is directly responsible for heavy rainfall, estimated between 50 to 100 millimeters, over the provinces of Occidental Mindoro and Oriental Mindoro. This volume of precipitation can quickly overwhelm drainage systems and saturate land, leading to rapid onset flooding. Beyond its direct rainfall contribution, Henry's presence has also necessitated the raising of Tropical Cyclone Wind Signal (TCWS) No. 1 over the southwestern portion of Zambales, the western portion of Bataan, and Lubang Islands. Under this signal, PAGASA warns residents of minimal to minor threats to life and property stemming from strong winds, prompting heightened alert in these coastal and island communities.
Tropical Depression Henry itself evolved from a low-pressure area (LPA) that had been traversing Southern Luzon on Tuesday, June 30. Even prior to its full development into a tropical cyclone, this LPA had already brought scattered to moderate and heavy rains across a wide area, including Metro Manila, Central Luzon, CALABARZON, the Bicol Region, MIMAROPA, and Western Visayas. The sustained enhancement of the Habagat, a direct consequence of these successive weather systems, is projected to maintain rainy weather, particularly in the MIMAROPA region, throughout Wednesday and Thursday.
In response to these dire forecasts, authorities are urging residents in all affected areas to remain acutely vigilant and to proactively implement all necessary precautionary measures. The volatile combination of intense rain, dangerous lightning, and strong winds significantly elevates the risk of flash floods in low-lying urban and rural areas, as well as destructive landslides in mountainous terrain. Local disaster risk reduction and management councils across Luzon have been activated, tasked with continuously monitoring evolving conditions and preparing for rapid response to potential emergencies. Communities are advised to take immediate steps such as clearing drainage systems to prevent blockages, strictly avoiding crossing flooded rivers and waterways, and being prepared for potential evacuations to safer ground at short notice. It remains critical for all communities to stay continuously updated with the latest weather bulletins from PAGASA, given the potential for conditions to change with little warning.
The current weather pattern fits squarely within PAGASA’s broader climate outlook for July, which projects the development or entry of two to four tropical cyclones into the Philippine Area of Responsibility during the month. While the long-term forecast suggests that the anticipated presence of an El Niño phenomenon from late 2026 to early 2027 may eventually lead to a reduced number of tropical cyclones, the immediate outlook for the coming months indicates that continued vigilance is paramount. From July through September, most parts of the country are expected to experience near-normal to above-normal rainfall, with heavy rainfall events predominantly affecting the western side of Luzon and Visayas. This extended projection underscores a fundamental need for sustained preparedness, particularly in regions historically identified as highly vulnerable to the devastating impacts of severe weather phenomena.
The ongoing situation necessitates a robust collective effort, extending from government agencies diligently disseminating timely and accurate information to communities actively participating in their own preparedness and mitigation measures. The recurrent nature of these powerful weather phenomena in the Philippines, an archipelago positioned within a typhoon belt, demands not just immediate and reactive responses but also the implementation of robust, long-term strategies for comprehensive climate resilience. As the rain continues to fall across Luzon, the enduring resilience of the island’s communities will once again be tested, highlighting the critical importance of foresight, preparedness, and swift collective action in the formidable face of nature’s power.