Grocery store shelves are emptying and evacuations are underway as Tropical Storm Isaac moves into the Gulf of Mexico.

As of Monday morning, Isaac is expected to make landfall as a category 2 storm on Tuesday, just a day shy of the seventh anniversary of Hurricane Katrina. States of emergency have already been declared in Louisiana, Florida, Mississippi, and Alabama.

For all the latest on the strengthening storm, evacuation updates and emergency preparedness, these Twitter accounts are must-follows this week.

Craig Fugate
FEMA administrator

NOLA Ready
The official emergency preparedness account for New Orleans

Mitch Landrieu
Mayor of New Orleans

Brendan Loy
PJ Media’s Weather Nerd

Evacuateer.org
Storm readiness and evacuation info for New Orleans

Louisiana GOHSEP
Governor’s Office of Homeland Security and Emergency Preparedness

Dr. Rick Knabb
Director, National Hurricane Center

John Snell
News anchor for Fox affiliate WVUE-TV

Hurricane Central
Updates from The Weather Channel

Jason Whitely
Senior reporter, Dallas–Fort Worth ABC affiliate WFAA-TV

Jonathan Betz
Reporter, Dallas–Fort Worth ABC affiliate WFAA-TV

WWL-TV
CBS-affiliated television station serving the New Orleans area

Jim Loznicka
Meteorologist, WJHG-TV in Panama City Beach

Margaret Orr
Chief Meteorologist, New Orleans NBC-affiliate WDSU

Dave Nussbaum
Meteorologist, Baton Rouge ABC affiliate WBRZ

Jennifer Watson
Meteorologist,  Huntsville, Alabama

Have any recommendations for other essential Twitter follows as Isaac bears down on the Gulf Coast? Leave them in the comment section.

Twitchy will monitor Tropical Storm Isaac and bring you the latest Twitter coverage.

Update:

Gov. Bobby Jindal is normally an infrequent tweeter, but his Twitter account has been active today as he reaches out to Louisiana residents preparing for Isaac to make landfall. Add the governor to your list of must-follows this week.