Tropical Cyclone Noru Has Finally Dissipated

Chris Kerr
2 min readAug 8, 2017

After persisting for almost 19 days, tropical cyclone Noru has dissipated. Noru is the third longest lasting tropical cyclone on record in the Northwestern Pacific basin, trailing Typhoons Rita (1972) and Wayne (1986).

Noru’s track from July 20 to August 8, 2017.

Throughout Noru’s lifetime, it tracked very slowly and made several loops throughout the Northwest Pacific. It even interacted with Tropical Kulap for a few days, which is something known as the Fujiwhara effect. Hurricane/Typhoon John is the longest lasting tropical cyclone in history and persisted for 31 days in 1994. I wrote about John last week.

Here are a few Noru stats:

Number of JTWC advisories: 76

Number of days as a tropical cyclone: 18.75

Estimated Maximum sustained winds: 130 knots (150 mph)

Now that Noru has dissipated, the only active tropical cyclone in the world is Tropical Storm Franklin, which is tracking over the Yucatan Peninsula this morning. It will emerge over the Bay of Campeche later today and will likely strengthen due to low wind shear and warm water temperatures. Given these favorable conditions, it has a chance to reach hurricane status before making a second landfall in eastern Mexico on Thursday.

Tropical Storm Franklin tracking over the Yucatan Peninsula.

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Chris Kerr

Director of Forecast Services at Weather Decision Technologies