Glossary details

Weather warnings/advisories

Tsunami warnings

Tsunami advisory
Be careful of an expected tsunami with a maximum height of 1m. (Height of tsunami to be announced: 1m)
Tsunami warning
Be alert for an expected tsunami with a maximum height of 3m. (Height of tsunami to be announced: 3m)
Great tsunami warning
Be striclty alert for an expected tsunami with a height of over 3m. (Height of tsunami to be announced: 5m, 10m, over 10m)

Emergency warning

Emergency warning
This warning is issued when there is a very strong possibility that a serious disaster will occur. Major Tsunami Warning is considered as an Emergency Warning.
heavy rain emergency warning
In case a typhoon or a localized torrential downpour is expected to result in a considerabe amount of rainfall that is experienced only once in a few decades, or a strong typhoon that is experienced only once in a few decades, or a heavy rain caused by an extratropical cyclone with the same degree, is expected
heavy snow emergency warning
In case a heavy snowfall is expected to result in a considerable amount of snowfall that is experienced only once in a few decades
storm emergency warning
In case violent winds are expected due to a strong typhoon that is experienced only once in a few decades, or an extratropical cyclone with the same degree
blizzard emergency warning
In case violent winds with snow is expected due to a strong typhoon that is experienced only once in a few decades, or an extratropical cyclone with the same degree
storm surge emergency warning
In case high tide is expected due to a strong typhoon that is experienced only once in a few decades, or an extratropical cyclone with the same degree
high waves emergency warning
In case high waves are expected due to a strong typhoon that is experienced only once in a few decades, or an extratropical cyclone with the same degree

Sediment disaster warning services

Sediment disaster warning services
These are important information that will serve as reference when the head of municipality makes a decision to issue Evacuation Counsel, etc., and when residents decide to voluntarily evacuate. When this information is announced, immediately evacuate to a safe place such as a nearby refuge place.

Flood forecast on designated rivers

Flood forecast on designated rivers
These are forecasts about flood made by cooperation of the Meteorological Agency and the MLIT(Ministry of Land, Infrastructure, Transport and Tourism) on predesignated rivers wherein the water level and flow rate of a selected stretch of river is shown to serve as reference for decision when flood prevention activities need to be conducted because of the rising or overflowing of the river, and reference for residents when they need to evacuate. There are 8 municipalities that are related to the rivers or stretch of rivers designated for flood forecasting; Okayama-shi, Kurashiki-shi, Souja-shi, Bizen-shi, Setouchi-shi, Akaiwa-shi, Wake-cho and Hayashima-cho.
Overflow advisory services (flood advisory)
This announcement is made when the water level on the reference point reaches the Overflow Alert Water Level (Level 2) and is expected to rise even more. In municipalities, decisions will be made on issuing Evacuation Preparation / Beginning of Evacuation of the Elderly based on the demands of the situation. All residents must pay attention to information about flood.
Overflow restriction services (flood warning)
This announcement is made when the water level on the reference point is expected to reach the Overflow Danger Water Level (Level 3) within a certain period of time and is expected to rise even more. In municipalities, decisions will be made on issuing Evacuation Counsel based on the demands of the situation. All residents must decide to evacuate.
Overflow hazard services (flood warning)
This announcement is made when the water level on the reference point reaches the Overflow Danger Water Level (Level 4). All residents must finish evacuating.
Overflow issuance services (flood warning)
This announcement is made when overflowing took place (Level 5) within the stretch of rivers designated for flood forecasting. In municipalities, evacuation guidance will be conducted for residents in the areas expected to be reached by the overflow. All residents in areas that are expected to be reached by the overflow must consider/decide to evacuate.

Information on record-breaking heavy rain in a short period of time

Information on record-breaking heavy rain in a short period of time
This announcement is made when a violent rain lasting for a short period of time that is experienced only once in a few years has been observed or analyzed (through weather radars and ground rain gauges). The standard for this in Okayama Prefecture is 90mm per hour in the southern part, and 100mm per hour in the northern part. Information about areas aside from where you live will be included in the mail deliveries.

Tornado warning

Tornado warning
This information calls for attention for a violent gust of wind, such as a tornado formed below cumulonimbus clouds, and is provided as supplementary information when Lightning Advisory is issued. The term of validity is an hour after the announcement. When announced, be watchful of the skies; in case you notice a sign of cumulonimbus clouds approaching, such as the sky suddenly turning dark, large drops of rain pouring, lightnings occurring, etc., take action to ensure your safety, such as evacuating to a well-built building.

Observed information

60-minutes rainfall (Rainfall intensity and damages)

Above 10mm, below 20mm
Slightly heavy rain. It will rain heavily. Voices cannot be heard clearly due to the sound of the rain.
Above 20mm, below 30mm
Heavy rain. Downpour. Gutters, sewers and streams overflow, and small landslides occur.
Above 30mm, below 50mm
Intense rain. The rain pours as from a bucket. Roads seem to be like rivers, and landslides tend to occur.
Above 50mm, below 80mm
Very intense rain. The rain pours as from a waterfall. Water may intrude basements and underground shopping areas. Debris flows tend to occur.
Above 80mm
Violent rain. There is a feeling of stifling oppression. There is a strong possibility that a large-scale disaster will occur.

Water level information

Stand-by water level for flood fighting corps
This water level demands the preparation and standby of the Flood Fighting Corps for dispatch. (Unit: m)
Flood watch water level
At this water level, the Flood Defense Corps. will be dispatched. (Unit: m)
Water Level Basis for Decision to Evacuate
This water level serves as a reference when the head of municipality makes a decision to issue Evacuation Preparation / Beginning of Evacuation for the Elderly, and calls for the residents to be watchful of the information about overflow. (Unit: m)
Flood danger water level
At this water level, the municipal authorities will announce an advisory evacuation and citizens may refer to further instructions at that time. (Unit: m)

Tide level information

Tide Level Basis for Notification
This tide level demands the preparation and standby of the Flood Fighting Corps for dispatch. (Unit: m)
Tide Level Alert
This tide level serves as a reference when the head of municipality makes a decision on issuing Evacuation Preparation / Beginning of Evacuation for the Elderly while High Tide Warning is issued. It also calls for the dispatch of the Flood Fighting Corps and calls for the residents to be watchful of the information about overflow. (Unit: m)

Dam information

Start of discharge
This means starting to discharge water from the dam's outlet gate. (Discharge with the purpose of water utilization such as electric power generation does not fall under this.)
Exceeded notification reference for discharge quantity
This means that the discharge quantity from the dam exceeded the "notification reference for discharge quantity", thus, having to notify related organizations and the public. (The notification reference for discharge quantity differs by dam, and in some cases, there is more than one set quantity.)
Flood regulation
Refers to the act of reducing flood damages to the downstream of a dam by storing a portion of the flood water to the dam reservoir when the inflow quantity has exceeded the flood quantity(*).

(*) Flood quantity ... The quantity of flow set for each dam considering when heavy rain starts to cause flood damages to low areas, etc.
Percentage of irrigation storage
Refers to the ratio of the dam's "storage capacity" and the "capacity for water utilization(*)." This is calculated by the formula below.
Percentage of irrigation storage (%) = Storage capacity ÷ Capacity for water utilization × 100 (%)
When the percentage of irrigation storage in several dams fall below 50%, water conservation may be required.

(*) Capacity for water utilization ... Refers to the capacity of water utilization such as tap water production, power generation, maintainance of river environments, etc. The capacity during flood season (mid-June to mid-October) and during non-flood season (mid-October to mid-June of the following year) may vary in some dams.

Evacuation information

Preparation for evacuation / Start the evacuation for the elderly etc

Preparation for evacuation / Start the evacuation for the elderly etc Level 3 Alert: Senior citizens evacuate
If the area is likely to experience human damages, the head of municipality will make an announcement to the residents. Those who need more time to evacuate such as people who need assistance like elderly people and people with disabilities must begin to evacuate to the planned refuge place. Others must begin to prepare for evacuation, such as preparing items to be taken with oneself in an emergency and contacting family members.

Evacuation advisory

Evacuation advisory Level 4 Alert: All persons evacuate
If the area is most likely to experience human damages, the head of municipality will issue Evacuation Counsel to the residents. Residents in the areas with this warning must take action to evacuate such as going to the planned refuge place.

Evacuation directive (Emergency)

Evacuation directive (Emergency) Level 4 Alert: All persons evacuate
If the situation in the area becomes tense, for instance, it experiences precursory phenomenon, and there is a very strong possibility for human damages to occur, the head of municipality will issue Evacuation Directive to the residents. Those who are currently evacuating must complete evacuation immediately. Those who have not evacuated must take immediate action to evacuate to a safe place considering the expected disaster, such as the upper floors of a building, an elevated ground, an open space, etc. In case of not having time to do so, do the least you can do to protect your life such as moving to a safer place that is possible to go to.

Damage information

Residential damages

Residential damages
Either one of the following has been confirmed: total collapse, half collapse, partial damage, inundation above floor level, inundation below floor level.

Human damages

Human damages
Either one of the following has been confirmed: loss of lives, missing people, heavily injured people, slightly injured people.

Others

Earthquake shock condition

Seismic intensity of 3
Most people indoors feel tremors. Dishes in cupboards may rattle. Electric wires swing slightly.
Seismic intensity of 4
Most people are startled. Hanging objects swing significantly and dishes in cupboards may rattle. Those driving vehicles may notice the tremor.
Seismic intensity of 5 Lower
Dishes in cupboards and items on bookshelves may fall. In some cases, windows may break and fall. People notice electricity poles moving.
Seismic intensity of 5 Upper
Walking is difficult without holding onto something stable. Unsecured furniture may topple over. Unreinforced concrete-block walls may collapse.
Seismic intensity of 6 Lower
It is difficult to remain standing. Many unsecured furniture move and some may topple over. Wall tiles and windows may break and fall down. Roof tiles of wooden buildings with low earthquake resistance may fall, and such buildings may lean or collapse.
Seismic intensity of 6 Upper
Crawling is the only way to move, and people may be thrown through the air. Most unsecured furniture move and many of them topple over. Most unreinforced concrete-block walls collapse. More wooden buildings with low earthquake resistance lean or collapse.
Seismic intensity of 7
Even more wooden buildings with low earthquake resistance lean or collapse. In some cases, even buildings with high earthquake resistance may lean. Many buildings constructed with reinforced concrete and with low earthquake resistance collapse.

Civil protection services

Civil protection services
We will inform you of any information on civil protection announced by the national government (information on ballistic missiles, guerilla attacks, air strikes, large-scale acts of terrorism, and other relevant information on civil protection).

PM2.5(Particulate Matter) information

PM2.5(Particulate Matter) information
If the daily average value of PM2.5 is expected to exceed the limit in provisional guidelines (70 microgram/㎥), we will issue an alert notification at 8AM or 1PM. Avoid leaving home if it is nonessential and nonurgent, and avoid vigorous exercise outdoors for long hours. When indoors, minimize ventilation and opening of windows. People with respiratory or circulatory diseases, young children and the elderly must act cautiously according to their health condition.

Tokai earthquake prediction

Tokai earthquake prediction
Information that the national government announces when they see a possibility that Tokai Earthquake will take place. When this announcement is made, the "areas requiring intensified measures to prevent earthquake disasters" wherein people are expected to conduct disaster prevention activities are: the whole prefecture of Shizuoka; almost all areas of Yamanashi Prefecture and Aichi Prefecture; some areas of Mie Prefecture, Gifu Prefecture, Nagano Prefecture and Kanagawa Prefecture; and some parts of the Izu Islands of Tokyo Prefecture. Tokai Earthquake itself is unlikely to cause strong tremors or tsunami to our prefecture.

Weather Forecast

Weather Forecast
Announced regularly (at 5AM, 11AM and 5PM), or as needed according to the situation. Through information mails on disaster prevention, you will be informed of the latest weather forecast at the time of the delivery. (If you have selected 7AM, you will be informed of the latest weather forecast; most likely the regular weather forecast at 5AM or a later forecast if any.)