Los Alamos, NM Warnings, Watches and Advisories

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NWS Active Alerts for NM - Map View

State: NM Alerts: 7 Updated: Sep 23, 2026 8:28pm MDT

Flood Warning

Area
Chaves, NM
Flood Warning issued September 23 at 8:26PM MDT until September 24 at 12:30PM MDT by NWS Albuquerque NM

* WHAT...Flooding caused by excessive runoff continues. * WHERE...Southwestern Chaves County in southeastern New Mexico... * WHEN...Until 1230 PM MDT Thursday. * IMPACTS...Flooding of rivers, creeks, streams, and other low-lying and flood-prone locations is imminent or occurring. Low-water crossings are inundated with water and may not be passable. * ADDITIONAL DETAILS... - At 821 PM MDT, the first flood wave along the Rio Penasco that prompted the warning has passed. However, a second flood wave is possible overnight from heavy runoff in the Sacramento Mountains. No additional rainfall is expected over the warned area. - Some locations that will experience flooding include... Dunken and Elk. - http://www.weather.gov/safety/flood

Flood Advisory

Area
Otero, NM
Flood Advisory issued September 23 at 7:52PM MDT until September 23 at 11:45PM MDT by NWS El Paso Tx/Santa Teresa NM

* WHAT...Arroyo and small stream flooding caused by excessive rainfall is occurring. * WHERE...Central Otero County in south central New Mexico... * WHEN...Until 1145 PM MDT. * IMPACTS...Minor flooding in low-lying and poor drainage areas. Some low-water crossings may become impassable. * ADDITIONAL DETAILS... - At 752 PM MDT, the public reported flooding in the advisory area. This is causing arroyo and small stream flooding. - Flooding impacts will continue, but no additional rainfall is expected. - Some locations that will experience flooding include... Sacramento, Mayhill, Pinon, Weed and Sixteen Springs. - http://www.weather.gov/safety/flood

Flood Watch

Area
Northern Dona Ana County; Southern Dona Ana County/Mesilla Valley; West Slopes Sacramento Mountains Below 7500 Feet; Sacramento Mountains Above 7500 Feet; East Slopes Sacramento Mountains Below 7500 Feet; Otero Mesa; West Central Tularosa Basin/White Sands; East Central Tularosa Basin/Alamogordo; Southeast Tularosa Basin
Flood Watch issued September 23 at 6:46PM MDT until September 25 at 6:00AM MDT by NWS El Paso Tx/Santa Teresa NM

* WHAT...Flooding caused by excessive rainfall continues to be possible. * WHERE...All of Dona Ana and Otero Counties in south-central New Mexico, as well as the far northern Tularosa Basin in far eastern Sierra County, New Mexico. * WHEN...Through 6 AM Friday. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Creeks and streams may rise out of their banks. Low-water crossings may be flooded. * ADDITIONAL DETAILS... - Deep moisture will remain in place through at least Friday morning, with weak disturbances producing periods of showers and thunderstorms. These storms will be far more localized than the rain we have already seen, and confidence in precise timing is low. But given the saturated conditions in the area, even brief storms could lead to localized flooding. - http://www.weather.gov/safety/flood

Flood Warning

Area
Chaves, NM; Lincoln, NM
Flood Warning issued September 23 at 5:49PM MDT until September 23 at 9:30PM MDT by NWS Albuquerque NM

* WHAT...Flooding caused by excessive rainfall is occurring. * WHERE...Southeastern Lincoln County in central New Mexico... Western Chaves County in southeastern New Mexico... * WHEN...Until 930 PM MDT. * IMPACTS...Flooding of rivers, creeks, streams, and other low-lying and flood-prone locations is imminent or occurring. Low-water crossings are inundated with water and may not be passable. * ADDITIONAL DETAILS... - At 544 PM MDT, the public reported flooding in the warned area, with low water crossings along the Rio Hondo inundated with water and impassable. - This includes feeder creeks and streams into the Rio Hondo. These tributaries may inundate additional low water crossings. - Some locations that will experience flooding include... Tinnie, Hondo, San Patricio and Sunset. - http://www.weather.gov/safety/flood

Flood Watch

Area
Guadalupe Mountains of Eddy County; Eddy County Plains; Northern Lea County; Central Lea County; Guadalupe Mountains Above 7000 Feet; Guadalupe and Delaware Mountains; Van Horn and Highway 54 Corridor; Eastern Culberson County
Flood Watch issued September 23 at 3:39PM CDT until September 25 at 7:00AM CDT by NWS Midland/Odessa TX

* WHAT...Flash flooding caused by excessive rainfall. * WHERE...Portions of southeast New Mexico, including the following areas, Central Lea, Eddy County Plains, Guadalupe Mountains of Eddy County and Northern Lea and southwest Texas, including the following areas, Eastern Culberson, Guadalupe Mountains Above 7000 Feet, Guadalupe and Delaware Mountains and Van Horn and Highway 54 Corridor. * WHEN...Through Friday morning. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Flooding may occur in poor drainage and urban areas. Low-water crossings may be flooded. * ADDITIONAL DETAILS... - Additional rounds of numerous to widespread showers and thunderstorms will develop over the Watch area this afternoon through Thursday night. Heavy rainfall may quickly result in areas of flash flooding. - http://www.weather.gov/safety/flood

Flood Watch

Area
Glorieta Mesa Including Glorieta Pass; Northern Sangre de Cristo Mountains; Southern Sangre de Cristo Mountains; East Slopes Sangre de Cristo Mountains; Santa Fe Metro Area; Sandia/Manzano Mountains Including Edgewood; Estancia Valley; Central Highlands; South Central Highlands; Upper Tularosa Valley; Johnson and Bartlett Mesas Including Raton Pass; Far Northeast Highlands; Northeast Highlands; Union County; Harding County; Eastern San Miguel County; Guadalupe County; Quay County; Curry County; Roosevelt County
Flood Watch issued September 23 at 1:11PM MDT until September 24 at 6:00AM MDT by NWS Albuquerque NM

* WHAT...Flash flooding caused by excessive rainfall continues to be possible. * WHERE...Portions of central, east central, north central, and northeast New Mexico, including the following areas, in central New Mexico, Central Highlands, Estancia Valley, Sandia and Manzano Mountains including Edgewood, South Central Highlands and Upper Tularosa Valley. In east central New Mexico, Curry County, Guadalupe County, Quay County and Roosevelt County. In north central New Mexico, East Slopes Sangre de Cristo Mountains, Glorieta Mesa Including Glorieta Pass, Northern Sangre de Cristo Mountains, Santa Fe Metro Area and Southern Sangre de Cristo Mountains. In northeast New Mexico, Eastern San Miguel County, Far Northeast Highlands, Harding County, Johnson and Bartlett Mesas Including Raton Pass, Northeast Highlands and Union County. * WHEN...Through late tonight. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Creeks and streams may rise out of their banks. Flooding may occur in poor drainage and urban areas. Low-water crossings may be flooded. Storm drains and ditches may become clogged with debris. Extensive street flooding and flooding of creeks and rivers are possible. * ADDITIONAL DETAILS... - Rounds of showers and storms will continue through Wednesday night. The heaviest rainfall will focus over the eastern plains where rainfall rates up to 2 inches per hour may occur. Rain will generally be lighter further west, but briefly heavy rates cannot be ruled out as far west as the central mountain chain. Rainfall totals will generally range from 0.5 to 1.5 inches, with isolated totals up to 4 inches. - Rapid runoff and flash flooding will be most likely in complex terrain, below recent burn scars, low-lying areas, urban areas, normally dry arroyos, near rivers and streams, and in locations where the ground is already saturated from recent heavy rainfall. - http://www.weather.gov/safety/flood

Flood Watch

Area
South Central Mountains; De Baca County; Chaves County Plains; Eastern Lincoln County; Southwest Chaves County
Flood Watch issued September 23 at 1:11PM MDT until September 25 at 6:00AM MDT by NWS Albuquerque NM

* WHAT...Flash flooding caused by excessive rainfall continues to be possible. * WHERE...Portions of central, east central, and southeast New Mexico, including the following areas, in central New Mexico, Eastern Lincoln County and South Central Mountains. In east central New Mexico, De Baca County. In southeast New Mexico, Chaves County Plains and Southwest Chaves County. * WHEN...Through late Thursday night. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Creeks and streams may rise out of their banks. Flooding may occur in poor drainage and urban areas. Low-water crossings may be flooded. Storm drains and ditches may become clogged with debris. Extensive street flooding and flooding of creeks and rivers are possible. * ADDITIONAL DETAILS... - Rounds of showers and storms will continue through Thursday night. While rainfall will generally be light to moderate, heavy rainfall rates up to 2 inches per hour will have the potential to produce rapid runoff. Soils are becoming increasingly saturated from persistent rainfall over the past couple of days, further elevating the risk of flash flooding. Rainfall amounts will generally range from 1 to 2 inches, with isolated totals up to 4 inches. - Rapid runoff and flash flooding will be most likely in complex terrain, below recent burn scars, low-lying areas, urban areas, normally dry arroyos, near rivers and streams, and in locations where the ground is already saturated from recent heavy rainfall. - http://www.weather.gov/safety/flood

SAFETY and DATA MESSAGE

Do not drive vehicles through flooded areas. The water depth or fast flowing water/mud/debris from a flash flood will make road conditions unsafe. Do not rely soley on data presented here or other third-party websites - always check your official national and local weather service agency website, socials, radio and/or TV stations for making critical decisions related to weather events.

Please carefully read each posted Warning and Alert as it relates to the area(s) being affected. We may provide a wider range of issued severe weather warnings for surrounding cities and counties, so some alerts may not directly impact this location. This is done to help with preparing for severe weather that may overlap or be heading towards Los Alamos.

Use the Radar Maps link provided to understand the trajectory of a storm.

Disclaimer

This severe weather alerts report is relevant for ZIP codes 87544 and 87545, accurately covering areas of Los Alamos, NM.

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