Weather to Watch: November 1, 2026

The rain can end before the river rises finish. Today's NWS discussions show how wet ground, mountain snow and the duration of rainfall shape runoff, while New Mexico's front and the northern Plains' fog offer different clues to an evolving storm.

1. Northern Arizona: wet ground changes what additional rain can do

When to watch: Sunday, November 1, through late evening, with elevated rivers potentially lasting for days afterward.

NWS Flagstaff describes widespread rain already occurring early Sunday as subtropical moisture and stronger flow reach the region. Air rising over terrain helps focus heavier rain along and south of the Mogollon Rim. A cold front approaching later Sunday adds another period of lift before drier air follows.

The same amount of rain can produce different runoff depending on the ground beneath it. The discussion emphasizes already saturated soils, meaning less additional rainfall is needed to cause problems. It forecasts a serious flash-flood and river-flooding concern, with some waterways remaining elevated beyond the main rain event. That forecast does not establish conditions at every crossing.

What to notice: Compare gauge totals over the whole event with official river observations and forecasts. Rain ending at your station does not mean upstream water has passed. Follow NWS warnings, stay away from waterways and never drive through flooded roads.

Source: NWS Flagstaff discussion, issued November 1 at 2:36 AM MST.

2. Central and eastern New Mexico: a front can organize storms into a line

When to watch: Sunday afternoon and night, November 1, in local Mountain time.

NWS Albuquerque expects a Pacific cold front to move quickly from west to east, reaching the Rio Grande Valley toward late afternoon. Lift along the boundary brings heavier precipitation to lower elevations, while instability and changing winds through the atmosphere support more organized storms farther east.

The discussion forecasts a line or broken line capable of damaging winds, hail and tornadoes, including rotating storms embedded within the line. These are forecast threats, not confirmed outcomes. Western mountain slopes also face persistent rain and flooding concerns even after the front's more intense band moves east.

What to notice: Use radar loops to follow the band's movement, and compare the timing with wind shifts at stations. Keep mountain rainfall separate from the moving severe-storm threat. Reflectivity alone cannot confirm a tornado or establish safe conditions. Have more than one way to receive official warnings and follow their instructions.

Source: NWS Albuquerque discussion, issued November 1 at 08:15 UTC.

3. San Juan Mountains: delayed cold air keeps more precipitation falling as rain

When to watch: Sunday, November 1, through Monday morning, November 2, with downstream flooding concerns extending beyond the mountain rain.

NWS Pueblo expects significant, dangerous flooding in parts of the San Juan Mountains and adjacent San Luis Valley. Its discussion identifies a slower arrival of colder air as a central concern: snow levels stay higher longer, allowing more precipitation to fall as rain over already soaked terrain and existing snow.

The office expects rain-on-snow melting to add runoff, but also says the forecast precipitation alone could cause flooding without that extra meltwater. Later cooling should lower snow levels and bring heavy wet mountain snow. That transition introduces another travel hazard; it does not instantly remove water already moving downstream. Forecast river crests remain uncertain.

What to notice: Compare the timing of falling snow levels with official river forecasts, rather than assuming a switch to snow is an all-clear. Heed evacuation instructions and road closures. Use remote river and road reports; do not approach fast water or unstable mountain roads to observe the event.

Source: NWS Pueblo discussion, issued November 1 at 1:04 AM MDT, before the local daylight-saving change.

4. South-central Arizona: widespread rain and later storms have different signatures

When to watch: Sunday morning through Sunday night, November 1, in Mountain Standard Time.

NWS Phoenix expects the main moisture plume to favor widespread soaking rain through the morning into early afternoon. Terrain north and east of Phoenix can enhance totals as moist air rises. Additional rain falls on ground and waterways already affected by earlier rainfall, so runoff may continue into the first half of the week.

Later Sunday, rain coverage can decrease while isolated thunderstorms remain possible. Instability is limited, but strong winds above the ground could be carried downward by a stronger storm. The discussion emphasizes damaging-wind potential and a small, nonzero chance of a brief tornado. Neither is an observed outcome simply because it appears in the forecast.

What to notice: Compare event-long gauge totals with short-interval rain rates and radar loops. A smaller afternoon rain area does not establish lower flood risk or rule out an isolated stronger storm. Follow official storm and flood warnings, especially around washes and low-water crossings.

Source: NWS Phoenix discussion, issued November 1 at 3:45 AM MST.

5. Eastern North Dakota and northwest Minnesota: fog clearing and the next rain band are separate questions

When to watch: Sunday morning, November 1, for fog; Monday, November 2, into Tuesday, November 3, for the broader rain event.

NWS Grand Forks describes dense fog expanding northward, with slower improvement expected in the northern Red River Valley. Moisture arriving near the ground supports low clouds, mist and poor visibility. The exact clearing time remains uncertain, so an advisory's scheduled end does not prove visibility has recovered everywhere.

For Monday and Tuesday, a deeper storm system is expected to bring widespread rain. Changing flow around the low can stretch and concentrate precipitation into a band, often called a deformation band. Its position and duration depend on the storm's track, making the heaviest totals less certain than the broader rain signal.

What to notice: Check actual visibility and road reports for the morning fog, then follow later radar loops and gauges for persistent rain banding. Fog lifting does not mean the next day's rain forecast has weakened. Compare nearby totals over matching hours rather than extending one station's reading across the region.

Source: NWS Grand Forks discussion, issued November 1 at 3:05 AM CST.

This dated selection uses NWS discussions available by 6:30 AM Eastern Standard Time on November 1. Source issuance labels are preserved across the daylight-saving change; weather windows use local calendar dates. For current forecasts and warnings, follow the National Weather Service.