Texas officials are preparing for heavy rain and possible flooding this week, deploying 1,900 state responders as moisture from the remnants of Hurricane Polo moves across the state. Gov. Greg Abbott said Monday at the state Emergency Operations Center that forecasters could not yet determine how much rain would fall. Officials are watching the Interstate 35 corridor closely for Wednesday, when a stalled weather front could bring especially heavy rainfall. “If it stalls, it could result in an extraordinary amount of inches of rain falling in those regions,” Abbott said. He urged Texans statewide to prepare for heavy rain and flooding, while cautioning that officials could not yet say which rivers might overflow. Rivers should be expected to rise, he said. Rain began in El Paso overnight Monday, and residents there were collecting sandbags Tuesday morning. Heavy rain was also forecast for parts of the Panhandle, including Lubbock and Amarillo. Texas Division of Emergency Management Chief Nim Kidd said boat teams were stationed in El Paso, Van Horn, Fort Davis, Amarillo, Dalhart and Levelland. He urged people to stay off roads when conditions become dangerous and never drive through water covering a roadway or a low-water crossing. “We lose too many lives and people trying to drive through low water in their vehicles,” Kidd said. The Texas National Guard had deployed 100 personnel, with 400 more on standby, Maj. Gen. Thomas Suelzer said. The Guard also made three Black Hawk helicopters equipped with hoists, rescue swimmers and 31 high-water rescue vehicles available. The Texas Department of Transportation said it had 1,200 personnel and 1,000 pieces of equipment engaged in preparations. Crews planned to monitor roads and drainage, clear debris and assess damage as needed, said Brandye Hendrickson, the department’s executive director for planning and administration. The scale of the deployment reflects the threat posed by a forecast that could change as the weather system moves east. Abbott said the state could not yet identify which rivers might flood, underscoring the importance of local alerts and avoiding flooded routes.