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Two cyclones spinning in the open waters of the eastern Pacific Ocean will have an opportunity to undergo an interesting meteorological phenomena this weekend known as the “Fujiwhara effect”.

The Fujiwhara effect occurs when two nearby low pressure circulations get closer together and then merge into one circulation. This interaction was first described by Japanese meteorologist Sakuhei Fujiwhara.

Hurricane John and Tropical Storm Kristy will gradually move closer to each other through the end of this week. Over the weekend the two circulation could get close enough to achieve the Fujiwhara effect.

The animation above represents a model solution for John and Kristy which shows the Fujiwhara effect between the two cyclones. John is modeled to have a larger circulation than Kristy, so John’s circulation would most likely absorb Kristy’s smaller circulation.

Neither system will be a threat to land, and the surviving circulation will most likely lose tropical characteristics by later next week.

Shanshan will move dangerously close to Japan Wednesday night and Thursday threatening parts of the country with wind, rain, and high surf through Friday.

The Details

Recent satellite imagery from the West Pacific shows Shanshan tracking to the northwest closer to Japan. However, the typhoon is rather small which means the worst wind and rain impacts will be confined close to Shanshan’s center.

As Shanshan approaches mainland Japan, the cyclone will get steered toward the north and then northeast. The center of Shanshan will get very close to land as it skirts by just east of Tokyo. This track will bring some wind, rain, and coastal flooding impacts to Japan, although the worst impacts are likely to remain just offshore.

Shanshan’s expected track will bring it close enough to bring Tokyo some strong winds and rain. Damaging winds and flooding are more likely east of Tokyo along the coast of the Kantō Prefecture.

Rain Impact Map

Wind Impact Map

Since Shanshan is still several days away from Japan, the track and associated impacts are subject to some changes through the early part of the week.

Powerful Hurricane Hector will track toward the west-northwest this week and pass just to the south of Hawaii.

Satellite imagery from Monday depicts a strong cyclone with a well-defined eye.

Hector has achieved major hurricane status which means the cyclone has sustained winds of at least 111 mph (96 kts). As of Monday night local time, sustained winds were as high as 155 mph (135 kts)

Environment conditions around Hector will remain favorable enough to sustain a major hurricane through Thursday.

The only major landmass that will be in the vicinity of Hector’s path this week is Hawaii. Fortunately for the US island state, steering winds will take Hector far enough south of the area to keep nearly all impacts off shore.

Tropical storm-force winds around Hector will extend up to 90 miles from the storm’s center. Based on Hector’s projected track, this will keep tropical storm winds (winds >39 mph or >34 kts) south of Hawaii.

The primary impact Hector will bring to Hawaii will be very large surf with waves of 10-20 feet (3-6 m) along the south facing shore of Hawaii’s big island through Thursday.

A tropical shower crossing New York City briefly put down a tornado across the borough of Queens around 10:30 pm Thursday evening.

The National Weather Service confirmed that an EF0 tornado touched down in the College Point neighborhood of Queens. The tornado traveled just over 1km with maximum winds estimated at 70-85 mph.

Numerous trees were damaged and some Queens residents lost electricity during the time the tornado was on the ground.

#BREAKING: NWS official confirms tornado touched down in Queens, at 124th Street and 15th Avenue, as wild weather hit Thursday. https://t.co/bvhAYEiU1s

— NBC New York (@NBCNewYork) August 3, 2018

Historically, there have been 10 tornadoes since 1950 that have touched down in NYC. 2010 was a particularly active year across the city with 3 tornadoes impacting 3 of NYC’s 5 boroughs.

Manhattan is the only NYC borough to escape any tornado touch downs.