72-Hour Storm Preparation for Southern California Properties

Rain readiness resources / Before, during, and after rain

Southern California · Commercial and multifamily owners

When rain is forecast, confirm who will check the property. Know which problems remain open and who will respond if something fails.

Use the stages below to check drains, pumps, access, vendors, and instructions for tenants and residents. Start sooner if known property risks call for it. Follow current National Weather Service forecasts and local authority guidance.

When to activate the 72-hour protocol

Use National Weather Service forecasts, watches, and warnings to plan when to act. Check local authority guidance too. Then review the property. A pump fault in a below-grade garage, an unfinished roof repair, or a low point that floods may call for earlier work.

Record why you started the plan. Note the forecast source and time, affected properties, and known risks. Name the manager, confirm vendor coverage, and set the next update. NOAA seasonal outlooks help with advance planning. They do not tell you when a specific storm will arrive or how strong it will be.

The seasonal property readiness guide explains how to rank those conditions before the event window opens.

72 to 48 hours before expected rain

Check the properties most at risk first. Give priority to problems that could change how the team responds.

• Review prior flooding, leaks, drainage failures, pump issues, tree or slope concerns, and recommendations that remain open.
• Confirm visible roof drains, site drains, gutters, downspouts, sump equipment, discharge paths, and known low points where safe and within scope.
• Verify keys, gates, roof access, garages, equipment rooms, vendor entry, and after-hours contacts.
• Confirm vendor coverage without promising availability that has not been accepted.
• Photograph known risk areas and visible pre-event condition from safe locations.
• Identify owner decisions that still fit the available work window and send a complete recommendation.
• Prepare property-specific resident or commercial tenant communication when an operational need is already known.

Record what you saw and did. A note that says “Drain checked” leaves too much unclear. Name the drain and the person who checked it. Add the date, its condition, any work done, and any limit that remains.

48 to 24 hours before expected rain

Finish the property checks and revisit risks that can change quickly. Confirm that approved work is done. Check that stored materials are approved and secure. For each temporary measure, name who is responsible and when it will be removed.

Tell tenants or residents when a property condition affects them. Explain parking or access changes and how to report a problem. Include any loading-area, balcony, or private-drain reminders that apply. Request safe access when needed. Give commercial tenants and multifamily residents separate instructions suited to their needs and agreements.

Tell the owner what remains open and what could happen during the forecast storm. Explain any temporary control and how the team will check it. Set a specific time for the next update.

Final 24 hours

Before rain starts, assign the response roles. Name who receives calls, checks threats to life safety, coordinates vendors, informs occupants, and updates the owner. Give response times only when access, weather, and vendor acceptance support them.

If access is safe, check the locations most at risk one last time. Confirm emergency contacts, gate access, any restrictions, and the current forecast. Note the condition of pumps and drains and whether notices reached occupants. Record each check’s time so later decisions can be traced to the facts then known.

During the storm

Put life safety first. Escalate active flooding, electrical hazards, sewage entry, unsafe access, and conditions that affect safe occupancy. Escalate conditions that could cause serious further damage too. Follow directions from emergency services, the National Weather Service, and local authorities.

For each report, confirm the property, exact location, and what is happening now. Check who is at risk, whether access is safe, and whether water is rising. Ask about electrical or sewage hazards. Request photos or video only from a safe place. Keep occupants and team members out of hazardous areas.

Record temporary measures, vendor acceptance, and any limits on arrival. Note what the owner and occupants were told and when the next update is due. Keep observed facts separate from the cause of the problem. Use a qualified specialist for technical conclusions beyond ordinary property management.

After the storm

Check known leak areas and all locations reported by occupants. Where safe, review roofs, drains, pumps, garages, low points, and equipment rooms. Include trees, slopes, and vacant units. Compare what you find with the record made before the storm.

Open a follow-up item for each permanent repair, drying need, specialist review, or owner decision. Add any checks still needed. Confirm that affected occupants received the next instruction. Keep access to restricted areas controlled.

The commercial application deserves its own continuity review. Use the commercial property storm preparation guide to connect tenant operations, loading, access, and building systems to this event protocol.

Temporary mitigation is not closure

Removing water, pumping, temporary covers, and water diversion can help control an incident. Safe access also matters. Keep the permanent repair open until its cause has been addressed and the result checked. Record the proposed repair, owner decision, and qualified scope where needed. Add proof of completed work and any checks still due.

Before closing an incident, explain what happened and what the team did at once. Identify the permanent work completed and any work still awaiting approval. Include the evidence that confirms the result. For unfinished work, name who will follow up and when.

Sources

• NOAA Climate Prediction Center, Long-Lead Seasonal Outlook, September 17, 2026
• California Department of Water Resources, Ways You Can Be Flood Ready
• National Weather Service forecasts, watches, and warnings