Mcallen Warnings, Watches and Advisories

When a severe thunderstorm warning is issued, the storm may produce damaging winds, large hail, dangerous lightning, and heavy rain. In some cases, heavy rainfall produced by a severe storm can also lead to flash flooding. 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 Mcallen.

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

Special Weather Statement issued September 10 at 5:23AM CDT by NWS Brownsville TX

The combination of hot temperatures and elevated humidity levels will produce heat index values between 108 and 111 degrees for several hours this afternoon into this evening. A few locations may briefly experience heat index values above 111 degrees. If you plan to spend time outside, drink plenty of water, wear light weight and light colored clothing and take frequent breaks from the heat. Young children and pets should never be left unattended in vehicles.

Flood Warning issued September 9 at 11:51PM CDT until September 10 at 9:00PM CDT by NWS Lake Charles LA

...The Flood Warning continues for the following rivers in Texas... Pine Island Bayou Near Sour Lake affecting Hardin and Jefferson Counties. For the Pine Island Bayou...including Sour Lake...Minor flooding is forecast. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Pine Island Bayou near Sour Lake. * WHEN...Until Thursday evening. * IMPACTS...At 25.0 feet, Water inundates roads in lowland areas near the river. Low spots on Old Sour Lake Road are under water. * ADDITIONAL DETAILS... - At 10:45 PM CDT Wednesday the stage was 25.4 feet. - Bankfull stage is 22.0 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 10:45 PM CDT Wednesday was 25.8 feet. - Forecast...The river is expected to fall below flood stage late tomorrow morning and continue falling to 19.3 feet Monday evening. - Flood stage is 25.0 feet. - Flood History...This crest compares to a previous crest of 25.4 feet on 11/09/2020. - http://www.weather.gov/safety/flood