UPDATE 4:43 p.m.: President Obama has declared a state of emergency for the state of Louisiana Monday afternoon, and "ordered federal aid to supplement local and state response" in a statement from the White House.
Gov. Bobby Jindal says the state of Louisiana requested a preemptive disaster declaration, which the Federal Emergency Management Agency (FEMA) says is still pending.
Tropical Storm Isaac is expected to make landfall as a Category 1 or 2 hurricane along the Gulf Coast Wednesday, somewhere between the Florida Panhandle and New Orleans.
"We sent a letter to yesterday to the federal government requesting a pre-landfall declaration," Jindal wrote on Twitter, amid updates about disaster preparations. "FEMA says it’s still pending."
Louisiana began evacuating individual parishes, nursing homes, and prisons over the weekend and has continued Monday, and has opened shelters in the state.