Attachments
I. Situation Overview
Issued on 01 September 2023 at 5PM, “Hanna” maintains its strength as it decelerates Westward
HAZARDS AFFECTING LAND AREAS
Heavy Rainfall
“Hanna” is less likely to directly bring heavy rainfall over the country throughout the forecast period. However, the Southwest Monsoon currently enhanced by “Hanna”, Typhoon “Saola” (“Goring”), and Severe Tropical Storm” Kirogi” will bring occasional to monsoon rains over the western portion of Luzon in the next three days. For more information, refer to Weather Advisory #16 for Southwest Monsoon issued at 11:00 AM today and 24-Hour Public Weather Forecast and Outlook at 4:00 PM today.
Forecast rainfall are generally higher in elevated or mountainous areas. Under these conditions, flooding and rain-induced landslides are expected especially in areas that are highly or very highly susceptible to these hazards as identified in hazard maps and in localities that experienced considerable amounts of rainfall for the past several days.
Severe Winds
“Hanna” is less likely to directly bring severe winds over the country throughout the forecast period. However, the enhanced Southwest Monsoon will continue to bring gusty conditions over the following areas not under any Wind Signal, especially in coastal and upland/mountainous areas exposed to winds:
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Today: Batanes, Ilocos Region, Cordillera Administrative Region, Zambales,
Bataan, Aurora, Bulacan, Metro Manila, CALABARZON, MIMAROPA, Bicol Region,
Western Visayas, and the northern portion of Eastern Visayas. -
Tomorrow: Batanes, Ilocos Region, Abra, Benguet, Zambales, Bataan, Bulacan,
Aurora, Metro Manila, CALABARZON, MIMAROPA, Bicol Region, Western Visayas, and the northern portion of Eastern Visayas.
HAZARDS AFFECTING COASTAL WATERS
“Hanna” is less likely to bring rough sea conditions over any seaboard of the country through the forecast period. However, due to the Southwest Monsoon that it is slightly enhancing, a Gale Warning is in effect for most seaboards of Luzon and Western Visayas, and the seaboard of Northern Samar. Disruption in civilian maritime activities is expected over these areas (e.g., suspension of sea travel) due to hazardous sea condition. For more information, refer to Gale Warning #20 issued at 5:00 PM today.
TRACK AND INTENSITY OUTLOOK
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“Hanna” is forecast to move generally west northwestward throughout the forecast period. On the track forecast, the tropical cyclone is forecast to pass close or make landfall in the vicinity of Yaeyama Islands in the Ryukyu archipelago between tomorrow evening and Sunday morning, then make landfall on Sunday morning and traverse over Taiwan. “Hanna” is forecast to exit the Philippine Area of Responsibility on Sunday afternoon or evening.
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Outside the PAR, the tropical cyclone will turn more westward as it passes over the Taiwan Strait before making another landfall over mainland China on Monday morning or afternoon.
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“Hanna” is forecast to reach its peak intensity on Sunday morning prior to its landfall over Taiwan. Rapid weakening will then ensue following its landfall over mainland China on Monday.
The center of the eye of Typhoon “Hanna” was estimated based on all available data at 710 km East Northeast of Itbayat, Batanes (22.2 °N, 128.5 °E) moving Westward at 15 km/h with maximum sustained winds of 120 km/h near the center and gustiness of up to 150 km/h.
Source: DOST-PAGASA Tropical Cyclone Bulletin #8
II. Status of Affected Areas and Population
A total of 129,258 families or 474,838 persons are affected in 1,663 barangays in Regions NCR, CAR, I, II, III, CALABARZON, MIMAROPA, VI, and VII (see Table 1).