Tropical Storm Prapiroon is about to end its standoff south of Japan.
The long-lived, slow-moving tropical cyclone will accelerate towards the north and east, skirting Japan and reaching the open North Pacific Ocean late in the week.
Along the way, Prapiroon will brush Okinawa and nearby Ryukyu Islands at midweek, stirring up gusty winds and rain.
Meanwhile, rain not directly related to Prapiroon, some heavy, will spread eastward over southern and central Japan.
As for Prapiroon itself, the bulk of its windswept, heavy rain will spread eastward south of the Japan mainland on Thursday and Friday. Coastal areas from Kyushu to eastern Honshu, near Tokyo, will be most susceptible to any adverse weather reaching the mainland.
Located west of the Mariana Islands, Prapiroon began life as a tropical depression on Oct. 5, then it was upgraded to named tropical storm on Oct. 7.
Storm intensity peaked at Category 2 typhoon status, as defined by the Japan Meteorological Agency, on Oct. 11. At the time, the storm drifted slowly over the open Philippines Sea.
Monday, as Prapiroon's strength waned, high pressure stalled its progress southeast of Okinawa.
As of Tuesday, Prapiroon, now only a tropical storm, had top sustained winds of 70 mph, the Joint Typhoon Warning Center (JTWC) said. It was centered about 325 miles southeast of Naha, Okinawa, Japan, or 1,100 miles southwest of Tokyo. Movement was slow and to the west.
Tropical storms Maria (right) and Prapiroon, as of 1300 UTC Oct. 16, 2012. (Japan Meteorological Agency -- JMA)
Elsewhere, Tropical Storm Maria, smaller and shorter-lived storm, was located almost 600 miles south of Tokyo as of Tuesday.
Maria had been buffeting the Volcano and Bonin islands, but it was on track to veer well east of mainland Japan Wednesday and Thursday.
Gales and wind gusts as high as 70 mph were clocked at Iwo Jima, one of the Volcano Islands.
The plum rains are known as "meiyu" in China, the "baiyu" or "tsuyu" in Japan, and the "jangma" in the Koreas. The heart of the plum rain season stretches from early June to mid-July, with a tendency to shift south to north across the affected area.
In the wake of the mid-June cloudbursts, most of Pakistan to northwestern India last week saw a return to dry, hot weather typical of the weeks leading up to the Monsoon onset. It was as if the Monsoon withdrew to its "normal" position for the latter half of June.
The 38.5 degree C (101 degrees F) reading Tuesday in Ajaccio, Corsica, may have been tops in Europe.
Monsoon Onset was June 13th, 2013, in Delhi, almost two weeks earlier than average. The June 15th onset at Karachi and Islamabad was more like three week ahead of schedule.
In Pakistan, hit-or-miss downpours missed the Sindh capital, Karachi. One did hit Pad Idan, where it left 60 mm of rain Wednesday. This was more than 20 times greater than the normal June rainfall.
It is still possible that this scenario is over wrought as to the intensity and spread of rain in Pakistan and northwestern India. However, it is the hunch of the present forecaster that some very unusual weather is going to unfold in the Subcontinent during the next week!