Typhoon Surigae is slowly moving away from the eastern provinces of the Philippines

The first super typhoon of the season in the West Pacific made a close approach to the Eastern Philippines this weekend. Monday morning, Surigae’s maximum wind speed decreased to 140 mph (220 kph). While it is no longer a super typhoon, it is still a powerful typhoon, equivalent to a category 4 Atlantic hurricane.

Over the weekend, Surigae attained maxmium sustained winds of 190 mph (305 kph), becoming the strongest typhoon on record for the month of April, surpassing Typhoon Maysak in 2015, among several others that had maximum sustained winds of 173 mph (278 kph), according to the National Oceanic and Atmospheric Administration historical hurricane database. The current track has Surigae slowly weakening as it moves parallel to the central and eastern Philippines over the next 24-36 hours. Based on the closeness of Surigae to eastern sections of the Philippines, a signal 2 alert remains in effect for parts of Luzon, Visayas, Northern Samar, Eastern Samar, Samar and Mindanao, according to the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA).

This means winds over 37 mph and up to 75 mph (over 60 kph and up to 120 kph) are expected within the next 24 hours. Additionally, heavy rainfall is expected in these areas that could produce flooding, flash flooding and rain-induced landslides. Rainfall over the past two days of 6 inches (146 mm) was measured in Catbalogen and 4 inches (97 mm) in Guiuan in the Visayas province. Super Typhoon Surigae began slowly moving toward the Philippines after it developed earlier this week, rapidly intensifying Friday, and then again Saturday. Rapid intensification occurs when a tropical cyclone strengthens 35 mph in a 24-hour period. This rapid intensification happened because of the ideal conditions for typhoon development: Wind shear, or the changing of wind speed and direction with height in the atmosphere, has been very low. High wind shear can tear storms like this to pieces, but low shear allows them to feed off the extremely warm waters and flourish into a powerful storm.

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