Simon and Rachel Raise Flood Risks in Mexico and the U.S.

Forecast note: The supplied reports refer to October 2026, a future date relative to the current publication context. Confirm storm status, tracks, rainfall totals, warnings, and affected locations with the National Hurricane Center, National Weather Service, Mexico’s National Water Commission, and local emergency agencies before publication.

Hurricane Simon and post-tropical Storm Rachel could create separate but overlapping flood hazards across Mexico, Southern California, the broader U.S. Southwest, and possibly parts of the Great Plains. The supplied reports describe Simon as affecting or approaching Mexico, while Rachel is associated with a flash-flood threat in Southern California and the Southwest. Source 1

The principal danger may shift from strong winds to heavy rain and flooding. A tropical cyclone can weaken after landfall or lose its formal tropical classification while retaining abundant moisture. When that moisture reaches mountains, dry desert terrain, urban areas, or saturated watersheds, flooding can develop quickly.

Residents and travelers should monitor official alerts, avoid flooded roads and waterways, and prepare for rapidly changing conditions.

What Is Known About Simon and Rachel?

Simon’s Potential Track and Hazards

The supplied reports describe Simon as a hurricane or tropical system affecting or targeting Mexico, with potential impacts along the Pacific coast. Another report says Simon’s remnants could move inland and create a multiday flood threat across parts of the Great Plains. Source 5

Near the coast, Simon could produce heavy rain, dangerous surf, strong wind gusts, coastal flooding, and landslides. Inland moisture could continue feeding rainfall after the center weakens. Potential hazards include:

• Flash flooding in steep terrain
• River flooding
• Mudslides and landslides
• Road and bridge closures
• Urban drainage problems
• Coastal inundation

The coastal and inland phases may affect different communities. Areas near landfall could face wind, surge, and high surf, while mountainous areas farther inland could experience runoff and landslides. Downstream communities may see rivers rise after the heaviest rain ends.

Forecast confidence depends on Simon’s track, forward speed, interaction with other weather systems, and the amount of tropical moisture that remains available.

Rachel’s Post-Tropical Flood Threat

The supplied reports describe Tropical Storm Rachel as a potential source of flooding in Southern California and the U.S. Southwest. Source 3 Another report highlights a flash-flood threat across Southern California and the Southwest. Source 9

“Post-tropical” means the system no longer meets the formal criteria for a tropical cyclone. It does not mean that rain, flooding, or damaging winds have ended. A post-tropical system can retain substantial moisture and interact with fronts, upper-level disturbances, and terrain.

Potential hazards include:

• Rapidly rising water
• Flooded streets and underpasses
• Mud and debris flows
• Washed-out roads
• Mountain runoff
• Disrupted travel
• Local power interruptions

Rainfall intensity, duration, and location often matter more than the storm’s name or wind category.

Why Tropical Remnants Cause Flooding

Tropical systems transport warm, humid air over long distances. After a storm weakens, its moisture can merge with a front or upper-level disturbance. Mountains force the air upward, producing condensation and heavy precipitation.

A remnant can generate dangerous rain far from the original storm center, particularly if it slows or repeatedly directs moisture into the same area. Flood risk depends on rainfall intensity, duration, storm speed, soil saturation, watershed size, terrain, drainage capacity, and existing river levels.

A weaker storm can cause greater inland flood damage than a stronger storm if it produces rain over vulnerable terrain for a longer period.

Terrain and Runoff

Steep terrain accelerates runoff. In the Southwest, desert washes and normally dry channels can become torrents during heavy rain. High-risk locations include mountain valleys, coastal foothills, desert washes, canyon communities, low-water crossings, urban drainage basins, and areas near creeks and channels.

Flooding can occur outside the area experiencing the strongest wind. Downstream communities may face dangerous water even when conditions overhead appear calm.

Previous rain can saturate soil and increase runoff. Blocked drains, debris, construction, and limited drainage can worsen urban flooding. Wildfire burn scars may also increase the risk of fast-moving debris flows; local authorities must confirm whether a specific burn scar is threatened.

Mexico’s Pacific Coast

The supplied reports describe Simon as targeting Mexico and indicate that additional landfalls could occur along the Pacific coast. Source 7

Coastal communities could experience heavy rain, flash flooding, coastal inundation, dangerous surf, strong wind gusts, landslides, and transportation disruption. Impacts will vary with landfall location, coastline shape, elevation, storm size, and local drainage.

Residents near rivers, streams, steep slopes, and low-lying coastal areas should follow official instructions. Conditions may appear calm before rainfall intensifies. Do not delay evacuation because a neighborhood has not yet flooded.

Flooding and landslides can disrupt highways, bridges, airports, ports, electricity, telecommunications, and water systems. Travelers should verify road conditions before departure and never drive across a flooded road.

Southern California and the Southwest

Rachel could bring heavy rain to Southern California and the Southwest, including inland and desert areas far from the coast. Potential impacts include flooded streets, rising water, debris flows, damaged roads, and disrupted travel.

Heightened awareness is appropriate in inland valleys, mountain communities, desert regions, wildfire burn scars, low-lying urban streets, creeks, channels, underpasses, canyons, and washes.

Follow Flash Flood Warnings immediately. Move to higher ground when instructed. Never drive, walk, or bicycle through floodwater, and never drive around barricades. Avoid canyons, washes, riverbeds, and low-water crossings during heavy rain.

Use the National Weather Service, county emergency management offices, and local authorities for immediate instructions. Social media observations should not replace official warnings.

Possible Great Plains Flooding

A tropical system can lose its tropical characteristics while continuing to transport moisture inland. The supplied FOX Weather report describes a possible multiday flood threat across parts of the Great Plains as Simon’s remnants move north and east. Source 5

The threat depends on Simon’s eventual track, speed, interaction with other systems, and available moisture. Specific states and rainfall totals require confirmation from current National Weather Service forecasts.

Short, intense rainfall can cause flash flooding, while multiday rainfall saturates soil and raises rivers over time. Potential consequences include rising rivers, agricultural losses, road and bridge closures, basement flooding, saturated levees and banks, and prolonged emergency response.

Residents should monitor forecasts, river gauges, county alerts, transportation updates, and emergency management instructions.

How the Threats Differ

Rachel’s reported threat centers on short-duration heavy rain, mountain runoff, urban flooding, debris flows, and flash flooding in Southern California and the Southwest. Warning time may be limited in steep terrain, narrow canyons, and desert washes.

Simon’s potential sequence is broader:

1. Coastal rainfall, wind, surf, and inundation
2. Mountain flooding and landslides
3. Inland rainfall from weakening remnants
4. Rising rivers and prolonged downstream flooding

Storm categories mainly describe wind strength. They do not fully describe rainfall, river flooding, landslides, or debris flows. Focus on official rainfall forecasts, flood watches and warnings, river conditions, and evacuation orders.

Preparation Checklist

Before Heavy Rain

• Review evacuation routes and emergency contacts.
• Prepare water, food, medication, flashlights, batteries, and phone chargers.
• Secure outdoor furniture and loose objects.
• Move vehicles away from washes, low areas, and flood-prone streets.
• Protect important documents and essential electronics.
• Check on people who may need assistance.
• Follow local instructions about evacuations and shelters.

During Flooding

• Stay indoors or move to higher ground when directed.
• Do not enter moving water.
• Treat every flooded road as dangerous.
• Do not drive around barricades.
• Avoid electrical equipment in wet areas.
• Continue monitoring official warnings.

After the Storm

Wait for authorities to confirm that travel is safe. Avoid downed power lines, damaged bridges, unstable slopes, and flooded structures. Treat floodwater as contaminated and do not enter damaged buildings until officials approve them.

Document property damage only when conditions are safe, then contact insurers and local assistance agencies. Check on neighbors without entering unsafe structures.

Reliable Storm Information

Use these sources for current information:

• National Hurricane Center for tropical cyclone advisories
• National Weather Service offices for U.S. warnings and rainfall forecasts
• NOAA River Forecast Centers for river conditions
• Local emergency management agencies for evacuations and shelters
• Mexico’s National Water Commission for hydrometeorological information
• Mexico’s National Civil Protection System for emergency guidance
• State, county, and municipal transportation agencies for road closures

Check each update’s publication time and forecast period. Distinguish watches from warnings, and review changes in rainfall forecasts, river conditions, evacuation orders, and road status. Preliminary reports should not be treated as final storm tracks or rainfall totals.

Conclusion

Hurricane Simon and post-tropical Storm Rachel could produce different but overlapping flood hazards. Simon’s potential impacts include Mexico’s Pacific coast, mountainous inland areas, and possibly parts of the Great Plains. Rachel’s reported threat focuses on Southern California and the broader Southwest, where steep terrain, washes, urban drainage, and burn scars can amplify flash flooding.

Storm classifications do not determine the full danger. Weakening or post-tropical systems can still carry heavy rain and cause flooding far from their original centers.

Check official local alerts before rainfall begins, prepare supplies, avoid flooded roads and waterways, and follow evacuation orders without delay.

Frequently Asked Questions

Is Hurricane Simon expected to affect Mexico?

The supplied reports describe Simon as targeting or affecting Mexico and potentially producing impacts along the Pacific coast. The exact track, landfall location, intensity, and rainfall totals require confirmation through current National Hurricane Center, Mexican weather, and civil protection forecasts.

Can post-tropical Storm Rachel still cause flooding?

Yes. A post-tropical designation describes a system’s structure, not the end of its hazards. Rachel could still produce heavy rain, flash flooding, mudslides, and debris flows if sufficient moisture remains and local terrain supports rapid runoff.

Which U.S. areas face the greatest flood risk?

The supplied Rachel reports identify Southern California and the broader Southwest as key areas of concern. Simon’s remnants could create a separate, prolonged threat farther inland, including parts of the Great Plains. Risk varies with storm track, rainfall duration, terrain, soil conditions, and drainage.

Why is flash flooding dangerous in the Southwest?

Dry or compacted ground may absorb water slowly. Steep terrain, narrow canyons, desert washes, urban surfaces, and wildfire burn scars can direct water, mud, and debris into populated areas quickly.

Should people drive during a tropical-remnant rain event?

Avoid flooded roads, washes, underpasses, and barricaded areas. Water depth, current strength, hidden debris, and road damage are difficult to judge from inside a vehicle. Turn around and use a safe route.

Where can residents find reliable storm information?

Use the National Hurricane Center, National Weather Service, local emergency management agencies, official Mexican weather and civil protection authorities, river forecast offices, and transportation departments. Local alerts provide immediate instructions, shelter information, road closures, and evacuation notices.