North America Weather & Natural Hazards Today – November 15, 2026

By Paul Harrison | Orbis Weather

Sunday, November 15, 2026 | United States, Canada & Mexico

Pacific Storms, Texas Flash-Flood Threat and Mountain Snow Dominate North America’s Weather

North America is facing another unsettled day as powerful Pacific weather systems bring rain and mountain snow to the western United States, while thunderstorms and potentially flooding rainfall threaten parts of Texas and the Gulf Coast.

The latest National Weather Service forecast, issued early Sunday, November 15, highlights two significant weather developments: a Pacific storm affecting the western states and a separate system moving from the southern Rockies toward Texas and the lower Mississippi Valley.

The combination is creating contrasting conditions across the continent, from snow-covered mountain highways in California to heavy thunderstorms near the Gulf of Mexico.

The most immediate flooding concern is along the Texas coast, where NOAA’s Weather Prediction Center has issued a Slight Risk of excessive rainfall for Sunday.

1. United States: Pacific Storms Bring Heavy Mountain Snow

The western United States remains under the influence of an active Pacific storm pattern.

Moisture moving inland from the Pacific Ocean is producing rain at lower elevations and snowfall across higher mountain ranges.

The Sierra Nevada in California is a particular concern following winter weather that has already created hazardous travel conditions.

The National Weather Service has highlighted heavy Sierra Nevada snowfall and the potential for dangerous mountain travel.

Main western weather hazards

• California: Heavy mountain snow, slippery roads and difficult travel through higher Sierra Nevada passes.

• Oregon and Washington: Periods of rain, with additional snow possible at higher elevations.

• Intermountain West: Changing precipitation conditions as Pacific disturbances move inland.

• Mountain communities: Reduced visibility, freezing temperatures and potentially hazardous driving conditions.

Snowfall accumulation can vary significantly with elevation. Communities in valleys may experience rain while nearby mountain passes receive substantial snow.

Travelers crossing the Sierra Nevada and other western mountain ranges should check highway restrictions, current winter storm warnings and updated snowfall forecasts before departing.

2. Texas and the Gulf Coast: Flash Flooding Becomes a Major Concern

One of Sunday’s most significant weather threats is developing across southeastern Texas.

An upper-level disturbance moving eastward from the southern Rockies is interacting with warm, moisture-rich air from the Gulf of Mexico.

This combination is expected to support showers and thunderstorms across the southern Plains and toward the western Gulf Coast.

NOAA’s Weather Prediction Center has identified a Slight Risk of excessive rainfall across portions of coastal Texas on November 15.

The forecast places particular emphasis on the coastal corridor between Houston and Corpus Christi, although the precise location of the heaviest rainfall remains uncertain.

What residents should watch for

• Intense thunderstorms producing heavy rainfall over short periods.

• Water accumulating on low-lying roads and urban streets.

• Rapid rises in drainage channels and small streams.

• Localized flash flooding where thunderstorms repeatedly affect the same locations.

Forecast guidance indicates that some locations could experience substantial rainfall, but the heaviest precipitation may remain offshore.

The Weather Prediction Center expects the principal heavy-rainfall threat to diminish by early Monday.

Residents should avoid driving through flooded roads, even when the water appears shallow.

3. Lower Mississippi Valley: Showers and Thunderstorms Spread East

The weather system affecting Texas is also expected to influence Louisiana and neighboring parts of the lower Mississippi Valley.

As the upper-level disturbance moves eastward, increasing moisture and atmospheric instability will support additional showers and thunderstorms.

The main concern is localized heavy rainfall, particularly where thunderstorms develop repeatedly over the same area.

Not every community will experience severe conditions. The distribution and intensity of rainfall will depend on the precise track of the system.

Residents across Louisiana and the surrounding Gulf Coast should monitor updated forecasts through Monday as the disturbance progresses eastward.

4. Great Lakes and Northeast: Cold Air and Lingering Snow Showers

Cold air remains an important part of the weather pattern across the Great Lakes, northeastern United States and parts of the Midwest.

Recent National Weather Service forecasts have highlighted lake-effect precipitation, scattered rain and snow showers, and freezing overnight temperatures.

Lake-effect snow occurs when cold air passes over relatively warmer lake waters, collecting moisture before producing snow downwind.

Areas that may experience these seasonal hazards include northern Michigan, western New York and higher elevations of the northeastern United States.

The greatest impacts are generally concentrated in locations exposed to favorable wind directions and sufficiently cold temperatures.

Higher elevations of the Appalachians and New England may also experience wintry precipitation as colder air interacts with passing disturbances.

Residents should remain alert for freezing temperatures, icy roads and changing visibility, particularly during overnight and early-morning travel.

5. Canada: British Columbia Rainfall and Early Winter Hazards

Western Canada remains an important area to monitor following significant rainfall across coastal British Columbia.

Earlier November storms produced substantial precipitation in several communities, leaving some ground saturated and increasing sensitivity to further rainfall.

On November 14, Environment and Climate Change Canada issued rainfall warnings for Howe Sound and the Sea-to-Sky corridor, including the Squamish-to-Whistler region.

Forecast additional rainfall was 40–70 mm (1.6–2.8 inches) through Sunday night.

Potential impacts include localized flooding, pooling water on roads, difficult mountain travel and rising streams.

These figures are from the November 14 forecast and are not independently confirmed rainfall totals for November 15.

Elsewhere in Canada

Across the Prairie provinces, Ontario, Quebec and Atlantic Canada, seasonal changes increase the possibility of freezing temperatures, snowfall and icy road conditions.

Northern Canada is already well into its winter season, with prolonged cold and snow presenting routine but significant transportation challenges.

No specific new nationwide Canadian storm-warning totals were independently verified for this edition.

For current provincial alerts, consult Environment and Climate Change Canada.

6. Mexico: Cold Fronts, Rainfall and Hazardous Coastal Conditions

Mexico continues to experience a mixture of seasonal cold fronts, tropical moisture and contrasting temperatures.

The Mexican National Meteorological Service identified rainfall threats across northern Baja California and parts of the Yucatán Peninsula in its November 14 forecast.

Rainfall forecasts for that period included 25–50 mm (1–2 inches) in northern Baja California, Campeche, Yucatán and Quintana Roo.

Other areas, including Sonora, Chihuahua, Veracruz, Tabasco, Oaxaca and Chiapas, were forecast to experience lighter but locally significant rainfall.

Strong winds and hazardous surf were also concerns along portions of the Baja California coast.

These are previous-day forecasts, not verified November 15 observations.

Main hazards to monitor

• Heavy showers and localized flooding in vulnerable communities.

• Strong coastal winds and dangerous waves.

• Colder mountain temperatures and possible wintry precipitation at high elevations.

• Thunderstorms capable of producing rapid runoff and isolated landslides.

For the latest official Mexican forecasts, consult Servicio Meteorológico Nacional.

7. Atlantic and Pacific Tropical Outlook: No New Cyclone Formation Expected

The Atlantic hurricane season continues until November 30, but the latest National Hurricane Center outlook indicates a quiet period across the monitored North American tropical basins.

As of the early November 15 outlooks, tropical cyclone formation is not expected during the next seven days across the Atlantic, Caribbean Sea, Gulf of Mexico, eastern North Pacific or central North Pacific.

The Atlantic outlook was issued at 1 a.m. EST on November 15. The eastern and central Pacific outlooks were issued late November 14 in their respective local time zones.

Although tropical cyclone formation is not anticipated, non-tropical storms can still produce dangerous waves, coastal flooding, heavy rainfall and strong winds.

Official updates: National Hurricane Center.

8. Wildfires and Air Quality Across North America

Wildfire activity remains an environmental concern even as cooler November weather reduces the seasonal fire threat across many regions.

The National Interagency Fire Center’s November 13 figures, previously reported by Orbis Weather, indicated:

These figures are historical reference data and should not be interpreted as live November 15 totals.

Dry vegetation, gusty winds and low humidity can still create localized wildfire threats, particularly where recent precipitation has been limited.

Smoke from active fires and prescribed burns can affect nearby communities.

Residents with respiratory sensitivities should monitor local air-quality conditions.

Official resources include National Interagency Fire Center and AirNow.

9. Earthquakes and Geological Hazards

North America remains one of the world’s most geologically active regions.

The greatest long-term earthquake exposure is concentrated along the Pacific tectonic boundary, extending from Alaska through western Canada and the western United States into Mexico.

Important seismic regions

Alaska and the Aleutian Islands: Active plate boundaries create the potential for significant earthquakes and, in some circumstances, tsunamis.

California: The San Andreas Fault system and surrounding faults remain major sources of earthquake risk.

Pacific Northwest: The Cascadia Subduction Zone presents a long-term risk of major earthquakes and coastal tsunamis.

Mexico: The Pacific coastline is exposed to earthquakes associated with subduction of oceanic plates beneath the North American continent.

These are established geological hazards, not reports of new earthquakes today.

A verified list of earthquakes recorded during the past 24 hours was not available for this edition. No specific new damaging earthquake or tsunami alert is being claimed.

For real-time seismic observations, visit the USGS Latest Earthquakes Map.

10. North America Weather Outlook: November 15–17

These are regional forecast trends. Local weather conditions may differ considerably.

11. North America Natural Hazards Summary

12. What North America Should Watch Next

The most important development during the next 24 hours is the potential for flash flooding across coastal Texas.

The Weather Prediction Center’s Slight Risk designation means scattered flash flooding is possible within the designated area. Residents should pay particular attention to updated rainfall forecasts and any Flash Flood Warnings issued locally.

The western United States also requires close monitoring as additional Pacific moisture moves inland, increasing the likelihood of further rain and mountain snow.

In Canada, recently saturated ground across parts of coastal British Columbia could make communities more vulnerable to additional rainfall.

Meanwhile, the quiet tropical outlook provides some welcome relief as the Atlantic hurricane season approaches its official end.

However, North America’s transition toward winter is bringing a different collection of hazards, including mountain snow, freezing temperatures, powerful Pacific storms and flooding rainfall.

Official Weather and Natural Hazard Sources

This report draws on official meteorological and environmental monitoring agencies, including:

• NOAA National Weather Service — U.S. weather forecasts and warnings.

• NOAA Weather Prediction Center — Rainfall, flooding and winter weather outlooks.

• National Hurricane Center — Tropical cyclone monitoring.

• Environment and Climate Change Canada — Canadian forecasts and alerts.

• Mexico’s National Meteorological Service — Mexican weather forecasts.

• National Interagency Fire Center — U.S. wildfire information.

• USGS Earthquake Hazards Program — Seismic activity and earthquake information.

About This Report

North America Weather & Natural Hazards Today is an independent daily weather and environmental news report produced by Orbis Weather, covering the United States, Canada and Mexico.

Editorial methodology: Orbis Weather uses official government forecasts, meteorological discussions and environmental monitoring resources to identify significant hazards. Forecast conditions are distinguished from verified observations. Where current data could not be independently confirmed, the report identifies the limitations rather than presenting estimates as established facts.

Corrections policy: Orbis Weather aims to provide accurate, clearly sourced reporting. Material factual errors should be corrected promptly, with significant corrections identified transparently.

Last updated: November 15, 2026, morning Eastern Standard Time. This edition incorporates November 15 U.S. weather and tropical outlooks, together with earlier Canadian, Mexican and wildfire information where newer verified observations were unavailable.

Important weather advisory: This article is provided for public information and is not an official weather warning. Weather forecasts and hazard alerts may change rapidly. Always follow instructions issued by national meteorological agencies, emergency management authorities and local officials.

Orbis Weather — Global Weather, Natural Hazards and Environmental News.

Reporting by Paul Harrison | November 15, 2026