Dangerous flash flooding is ongoing in portions of the Rio Grande Valley this evening. A flash flood warning is in effect until at least 10:45 PMfor southern Hidalgo, northwestern Cameron, and western Willacy counties in the Rio Grande Valley. This includes Pharr, Harlingen, Weslaco, San Juan, Alamo, Donna, Mercedes, Raymondville, and La Feria. An additional one to three inches of rain is possible over the next two hours.
Radar-estimated rain totals are approaching six inches from south of Rudolph to Raymondville to Lyford and Sebastian. Rain totals are rapidly increasing farther southwest in Elsa, Alamo, Weslaco, and La Feria. Two to six inches of rain has fallen in the last two hours. That will result in a fairly serious flash flood threat.
What is also concerning is that we have additional heavy thunderstorms moving back into the area. These storms are ‘training’ over the same areas. That is resulting in extremely high rainfall rates across the aforementioned areas. This has the potential to be a serious flash flood event with significant flooding possible. Avoid traveling if possible as it’ll become more difficult to discern flood waters now that it’s dark out. Hopefully we’ll see this very heavy rainfall let up over the next hour or two, but for now, we continue with hourly rainfall rates of 2 to 3 inches. This will be impacting Interstate 69 and Interstate 2.