Lake Houston and Lake Conroe had their water levels lowered ahead of Tropical Storm Nicholas’ anticipated effect on the Greater Houston area.

Just after 2 p.m. Sept. 13, the San Jacinto River Authority, which manages Lake Conroe’s water levels, reported on its website that the lake was approximately 1 foot below conservation pool. The river authority tweeted that it anticipated 4-10 inches of rainfall from Nicholas.

Similarly, the Coastal Water Authority reported on its website Sept. 12 that Lake Houston had begun lowering its water levels; as of 1:15 p.m. on Sept. 13, Lake Houston was approximately 1 foot below its peak capacity.

Houston Mayor Sylvester Turner asked residents via Twitter to plan to be off the roads by sundown Sept. 13.

“Help yourself out and help us out and plan to be off the roads by sundown,” Turner wrote in the post.

Montgomery County Judge Mark Keough posted a similar message on Facebook, adding county officials expected 5-7 inches of rainfall through Sept. 16.

“All of our county agencies are standing by and prepared to respond,” Keough wrote in the post.