Collection Disaster Preparedness 2026.08.10

Post-Rain Hazard Check

Monitoring Late Water Levels, Slips, Falling Objects, Electricity, Flooding, and Resuming Activities

#Life Safety #Sudden Rain #Weather Safety #Lightning #Heavy Rain Preparedness

Once the rain stops and the sky clears, it's easy to think the danger has passed. However, issues can emerge later, such as water from upstream, wet electrical facilities, and loosened branches. Public transport and outdoor facilities do not return to normal immediately after the rain stops. This list outlines post-rain hazards and official checks needed before resuming activities, both indoors and outdoors.

Each item is about identifying risks and taking action rather than ranking forecast accuracy. Check the latest screens for your current location and destination and, if you have children, elderly, or outdoor companions, first determine evacuation sites and contact methods. It's also wise to save key information and emergency contact methods in case data connectivity is lost. As rain showers can form and dissipate quickly, the screen you check before leaving may differ by the time you arrive at your destination, so it's essential to reconfirm your safety again indoors during your travel.

Rechecking River and Valley Water Levels

Checking the water levels of rivers and valleys is crucial because even after the rain stops, water from upstream can raise levels later. First, do not approach water bodies until updates on control lifts and water levels are confirmed. Just because the sun is out, don’t rush onto stepping stones or walkways. Rain can fall intensely over narrow areas or accompany gusts and lightning, so it's hard to rely on just one checked screen. Before departing or resuming activities, check the meteorological radar, short-term precipitation forecasts, lightning, and warnings again, prioritizing any on-site control and guidance from facility operators.

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Waiting After the Last Thunder

After the last thunder, activity resumption should be delayed, even if the rain diminishes, due to the possibility of continued lightning. First, wait about 30 minutes in a safe indoor environment after the last thunderclap. Just because it brightens between clouds doesn’t mean you should immediately take out metal equipment. Rain can fall intensely over narrow areas or accompany gusts and lightning, so it's hard to rely on just one checked screen. Before departing or resuming activities, check the meteorological radar, short-term precipitation forecasts, lightning, and warnings again, prioritizing any on-site control and guidance from facility operators.

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Wet Stairs and Decks

Wet stairs and decks pose slipping hazards because of surface water, moss, and dirt. First, hold onto the handrails and take shorter steps while avoiding controlled paths. Do not walk or run while looking at a photo. Rain can fall intensely over narrow areas or accompany gusts and lightning, so it's hard to rely on just one checked screen. Before departing or resuming activities, check the meteorological radar, short-term precipitation forecasts, lightning, and warnings again, prioritizing any on-site control and guidance from facility operators.

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Falling Branches and Signs

Falling branches and signs can pose risks as loosened objects may drop after gusts. First, look for overhead trees and temporary structures, moving along paths secured by managers. Do not attempt to move fallen branches or wires yourself. Rain can fall intensely over narrow areas or accompany gusts and lightning, so it's hard to rely on just one checked screen. Before departing or resuming activities, check the meteorological radar, short-term precipitation forecasts, lightning, and warnings again, prioritizing any on-site control and guidance from facility operators.

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Manhole and Road Damage

Manholes and road damage pose risks as holes and loose covers can be obscured by rainwater. First, avoid stagnant water and detour to bright roads, reporting any suspicious areas. Do not verify depth with a stick or foot before entering. Rain can fall intensely over narrow areas or accompany gusts and lightning, so it's hard to rely on just one checked screen. Before departing or resuming activities, check the meteorological radar, short-term precipitation forecasts, lightning, and warnings again, prioritizing any on-site control and guidance from facility operators.

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Prohibition of Access to Flooded Vehicles

Avoid approaching flooded vehicles, as internal electricity, flow, and depth create dangerous situations without proper rescue. First, inform 119 and 112 and road management organizations of your location and follow control lines. Do not enter the water to try to open doors or tow vehicles. Rain can fall intensely over narrow areas or accompany gusts and lightning, so it's hard to rely on just one checked screen. Before departing or resuming activities, check the meteorological radar, short-term precipitation forecasts, lightning, and warnings again, prioritizing any on-site control and guidance from facility operators.

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Electrical Wires and Equipment Inspection

Checking wires and electrical facilities poses the danger of electric shock from wet electrical equipment or downed wires. First, if chargers or outlets are wet, shut off the power and request an expert inspection. Avoid touching circuit breakers and plugs with wet hands or approaching wires at this time. Rain can fall intensely over narrow areas or accompany gusts and lightning, so it's hard to rely on just one checked screen. Before departing or resuming activities, check the meteorological radar, short-term precipitation forecasts, lightning, and warnings again, prioritizing any on-site control and guidance from facility operators.

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Indoor Leak and Ceiling Inspection

Indoor leakage and ceiling checks are necessary post-rain due to the potential for ceiling materials to fall or electrical systems to get wet. First, clear the area below any leaks and notify the building manager immediately. Do not poke at bulging ceilings or switch on wet lights at this time. Rain can fall intensely over narrow areas or accompany gusts and lightning, so it's hard to rely on just one checked screen. Before departing or resuming activities, check the meteorological radar, short-term precipitation forecasts, lightning, and warnings again, prioritizing any on-site control and guidance from facility operators.

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Verification of Public Transport Normalization

Confirming public transport normalization is essential since the end of the rain and the resumption of operations may not align. First, check the operating authority's announcements and station or stop controls before departing. Do not go to closed entrances just based on estimated travel times from map apps. Rain can fall intensely over narrow areas or accompany gusts and lightning, so it's hard to rely on just one checked screen. Before departing or resuming activities, check the meteorological radar, short-term precipitation forecasts, lightning, and warnings again, prioritizing any on-site control and guidance from facility operators.

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Decision to Resume Outdoor Activities

Deciding to resume outdoor activities is the final step, summarizing whether road surfaces, facilities, lightning, and water levels are all safe. First, check the release of controls by the on-site manager and the latest weather screens to gradually resume the schedule. At this time, do not enter closed sections just because you feel the wait was long. Rain can fall intensely over narrow areas or accompany gusts and lightning, so it's hard to rely on just one checked screen. Before departing or resuming activities, check the meteorological radar, short-term precipitation forecasts, lightning, and warnings again, prioritizing any on-site control and guidance from facility operators.

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After the rain stops, it's important to check water levels, road conditions, facility statuses, and the lifting of any bans in order. After the last thunder, wait about 30 minutes, and for rivers and valleys, avoid them for a longer time to account for upstream effects. Do not touch downed wires, flooded vehicles, or bulging ceilings; instead, report them to the appropriate authorities. It’s better to delay any movement or outdoor activities until the operating authority verifies safety.

Rather than memorizing a list, it’s practical to prepare frequent access to weather screens from the meteorological agency and local transport or facility notifications. Follow the control lines and on-site instructions before personal judgment, and do not return to dangerous areas just to retrieve belongings or maintain a schedule. If you encounter life-threatening situations or isolation, accurately inform the authorities at 119 or 112 of your location and situation. It’s essential not to rush resuming activities after the rain has stopped, as lightning, upstream water levels, road and facility conditions may take time to stabilize.

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Rechecking River and Valley Water Levels

Waiting After the Last Thunder

Wet Stairs and Decks

Falling Branches and Signs

Manhole and Road Damage

Prohibition of Access to Flooded Vehicles

Electrical Wires and Equipment Inspection

Indoor Leak and Ceiling Inspection

Verification of Public Transport Normalization

Decision to Resume Outdoor Activities