The Japan Meteorological Agency announced that Typhoon 27 could approach the Ogasawara Islands with very strong intensity.
Regardless of whether the center of the typhoon reaches the islands, high waves accompanied by swells and strong winds were identified as hazards.
In particular, the forecast wave height for the 5th and 6th is 8m, making sea conditions the point requiring the most specific caution.
3-Line Summary
1. Typhoon 27 is expected to approach the Ogasawara Islands
2. The forecast wave height for the 5th–6th is 8m
3. Beware high waves accompanied by swells
Moving Northeast at 15㎞/h in the Early Hours of the 4th
According to explanatory information issued by the Japan Meteorological Agency at 4:51 a.m. on October 4, large and very strong Typhoon 27 was located near the Ogasawara Islands at 3 a.m. At the time, the typhoon was moving northeast at approximately 15㎞/h.
The central pressure was 945 hectopascals, the maximum wind speed near the center was 45m/s, and the maximum instantaneous wind speed was 60m/s. The agency explained that winds of 25m/s or more were blowing within a radius of 150㎞ from the center.
These figures show the strength near the center of the typhoon. They should be distinguished from the wind forecast issued for the Ogasawara Islands. On the islands, the forecast maximum wind speed for the 5th and 6th is 23m/s, and the maximum instantaneous wind speed is 35m/s.
Concern About an Approach With Very Strong Intensity From the Evening of the 5th to Early on the 6th
The agency forecast that the typhoon would continue moving northward along the seas east of Japan from the waters near the Ogasawara Islands through around the 7th. During that process, it said there was concern that the typhoon could approach the Ogasawara Islands with very strong intensity between the evening of the 5th and the early hours of the 6th.
This is a forecast based on its position and projected path at the time. The agency urged caution regarding high waves accompanied by swells in the Ogasawara Islands through the 6th, and asked people to remain alert to strong winds from the 5th through the 6th.
The typhoon’s movement speed was given as approximately 15㎞/h, but the period when hazards emerge does not end after just one day. Along with the possibility of an approach from the evening of the 5th to early on the 6th, the announcement separately emphasized the wave hazard continuing through the 6th.
Waves Forecast at 6m on the 4th and 8m on the 5th–6th
The most specific hazard figure is wave height. In the Ogasawara Islands, waves reaching 6m were forecast for the 4th, and waves reaching 8m were forecast for both the 5th and 6th. All three days were announced as conditions accompanied by swells.
The agency forecast that the seas would become extremely rough during this period. High waves can continue not only when the center of the typhoon draws near but also under the influence of swells, so the announcement listed waves and strong winds separately as matters requiring caution.
The weather forecast reported by Yahoo! News on the evening of the 3rd also forecast wave heights of 6m in the Ogasawara Islands on the 4th and 8m on the 5th. The key point confirmed in common by the two reports is that marine hazards in the Ogasawara Islands will increase as Typhoon 27 moves northward.
References
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