Hornbrook Warnings, Watches and Advisories

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 Hornbrook.

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

Extreme Heat Warning issued May 10 at 12:24AM MST until May 11 at 8:00PM MST by NWS Phoenix AZ

* WHAT...Dangerously hot conditions. Afternoon temperatures 106 to 112 expected. Major Heat Risk. * WHERE...In Arizona, Parker Valley and Yuma. In California, Chuckwalla Valley, Imperial Valley, and Palo Verde Valley. * WHEN...From 11 AM MST /11 AM PDT/ to 8 PM MST /8 PM PDT/ Monday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. Overexposure can cause heat cramps and heat exhaustion to develop and, without intervention, can lead to heat stroke.

Extreme Heat Warning issued May 10 at 12:24AM MST until May 11 at 8:00PM MST by NWS Phoenix AZ

* WHAT...Dangerously hot conditions. Afternoon temperatures 100 to 114 expected. Major Heat Risk. * WHERE...Southwest corner of Imperial County, Western Imperial County, and Salton Sea. * WHEN...From 10 AM this morning to 8 PM PDT Monday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. Overexposure can cause heat cramps and heat exhaustion to develop and, without intervention, can lead to heat stroke.

Heat Advisory issued May 9 at 8:25PM PDT until May 11 at 8:00PM PDT by NWS San Diego CA

* WHAT...Temperatures 95 to 101 degrees. * WHERE...San Bernardino and Riverside County Valleys-The Inland Empire. * WHEN...From 10 AM to 8 PM PDT Monday. * IMPACTS...Hot temperatures may cause heat illnesses.

Extreme Heat Warning issued May 9 at 8:25PM PDT until May 11 at 8:00PM PDT by NWS San Diego CA

* WHAT...Dangerously hot conditions with temperatures 104 to 109 degrees possible. * WHERE...Coachella Valley, San Diego County Deserts, and San Gorgonio Pass near Banning. * WHEN...From 10 AM Sunday to 8 PM PDT Monday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. * ADDITIONAL DETAILS...Hottest conditions expected on Monday.

Heat Advisory issued May 9 at 7:31PM PDT until May 12 at 8:00PM PDT by NWS Hanford CA

* WHAT...High temperatures up to 102 with widespread Moderate HeatRisk expected. Areas of Major HeatRisk will impact portions of the foothills where the thermal belt exists overnight and in urban areas including Fresno. * WHERE...San Joaquin Valley, Coastal Ranges, as well as Lake Isabella and the Kern River Valley. * WHEN...From 11 AM Monday to 8 PM PDT Tuesday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

Heat Advisory issued May 9 at 10:42AM PDT until May 12 at 8:00PM PDT by NWS Sacramento CA

* WHAT...Temperatures up to 95 to 100 expected with widespread Moderate HeatRisk. * WHERE...Central and Western Stanislaus County including Modesto and I-5, Butte County below 1000 ft, Eastern Colusa County, and Eastern Glenn County. * WHEN...From 11 AM Monday to 8 PM PDT Tuesday. * IMPACTS...Hot temperatures may cause heat illnesses, especially for those more sensitive to heat. * ADDITIONAL DETAILS...Hot daytime temperatures will occur in other Valley locations as well, though Delta influence will better moderate low temperatures providing overnight relief.

Air Quality Alert issued May 9 at 10:01AM MST by NWS Phoenix AZ

* WHAT...The Imperial County APCD has extended an air quality alert due to harmful levels of ozone pollution. Visit https://www.aqmd.gov/alertinfo to check current and forecasted air quality levels. * WHERE...the Imperial Valley. Levels of ozone pollution can vary by time and location depending on emissions and air pollution transport. * WHEN...from 11 a.m. Saturday, May 9, 2026 to 9:00 p.m. Sunday, May 10, 2026. The highest ozone levels typically occur in the afternoon and early-evening hours. * IMPACTS... Ozone air pollution can cause serious health problems, including trouble breathing, asthma attacks, and lung damage. Everyone can be affected, but sensitive groups such as people with lung disease, older adults, people who are pregnant, children, and those who spend a lot of time outdoors are at greater risk.