May Storm Brings Flood Threats to Japan


Western Japan is set to see heavy rainfall through Monday ushering in the threat of landslides and flooding in Kyushu and Shikoku. The low pressure area centered just east of Korea but a long frontal area Is stretching clear south of Okinawa pulls in a abundance of moisture off of the Kuroshio current.

 

Tenki.jp analysis on storm

In Kyushu a training of thunderstorms is possible in the Kumamoto area, a location that is prone for landslides due to repeated aftershocks from last months quake in the area.  The heaviest rainfall will occur along the south and east coast of Shikoku where over 130mm is likely going through Monday.

 

Thunderstorms are also possible in Okinawa along the tail end of the front. Rain will not be as big of a issue there but lightning and the possibility of a waterspout will remain the main threats.

 

72hr rainfall

72hr rainfall

Further North in to Tokyo the rain should hold off until Tuesday morning. For Tuesdays AM commute people heading to work should bring with them a umbrella and be ready for short time heavy showers.  Great news is that all of Japan will see clear conditions and warmer weather through the rest of the week after the passing of the low pressure area.

 

A side effect of this storm will be in the tropics where the front will create instability futher south. Overall this will destroy most activity in the tropics but a low could form on the tail end of the front creating a hybrid tropical/mid-lattitude storm system. GOOD NEWS this will head east out to sea and for all intents and purposes it is nothing to worry about unless you are a boater. But it is something to look at, at the very least.

Tokyo Forecast

Date 16
Mon
17
Tue
18
Wed
19
Thu
20
Fri
21
Sat
22
Sun
Tokyo MOSTLY CLOUDY RAIN, CLOUDY LATER PARTLY CLOUDY PARTLY CLOUDY PARTLY CLOUDY PARTLY CLOUDY MOSTLY CLOUDY
Probability of
Precipitation (%)
-/10/10/10 60/90/60/10 20 10 10 10 20
Reliability / / B A A B A
Tokyo High (°C) 24
20
25
(21 – 29)
27
(25 – 30)
27
(25 – 29)
26
(24 – 29)
27
(24 – 30)
Low (°C) / 18
16
(14 – 18)
16
(14 – 18)
17
(15 – 19)
17
(15 – 20)
18
(15 – 20)
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