Higher Risks of Tide Inundations during Summer to Fall : Provision of Hourly Tide Level Calendars for Reconstruction Activities and Preparedness of the Residents in the Affected Areas
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| The Japan Meteorological Agency (JMA) has released hourly astronomical tide level calendars at twelve ports in Tohoku and North-Kanto region, in order to support reconstruction activities and preparedness of the residents in the affected coastal regions. |
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Kuji Miyako Kamaishi Ofunato Ayukawa Shiogama Sendai Shinko Soma Onahama Hitachi Oarai Kashima |
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Kuji Miyako Kamaishi Ofunato Ayukawa Shiogama Sendai Shinko Soma Onahama Hitachi Oarai Kashima |
| Coastal areas experiencing land subsidence in Tohoku and North-Kanto region are now facing higher risks of tide inundations during summer to fall. Due to thermal expansion of sea water during the season, high water levels of spring tides are expected to rise by up to 10 to 15 cm from July to August, and by up to about 20 cm from September to October, compared with in June. |
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| The table below is a sample of hourly astronomical tide level calendar. For example, at 40 cm above sea level, expected duration of tide inundation is roughly up to 5 hours per day in total in June (e.g. see June 4). It will increase up to about 9 hours per day in total in September (September 30). Note that actual duration of inundation can be different from this table because tide levels can be higher than astronomical tide levels by a few to tens centimeters, or more, during low pressure system's approaching. |
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| Special attention to tide inundations are needed, especially a couple of days before and after dates of full or new moon when high water levels reach their maximums. |
| Full Moon | New Moon |
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| June 16, 2011 | July 1, 2011 |
| July 15, 2011 | July 31, 2011 |
| August 14, 2011 | August 29, 2011 |
| September 12, 2011 | September 27, 2011 |
| October 12, 2011 | October 27, 2011 |
| November 11, 2011 | November 25, 2011 |
| December 10, 2011 | December 25, 2011 |
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