Hurricane Isaac, described in 12 hours of tweets.

Hurricane Isaac in a timeline of The Weather Channel tweets over the last 12 hours.

Landfall:

BREAKING: Hurricane #Isaac made landfall at 6:45pm CDT in Plaquemines Parish, LA, just SW of the mouth of the Mississippi River.
— Hurricane Central (@twc_hurricane) August 29, 2012

Then it backtracks:

It appears to us that the center of #Isaac has since wobbled to the west back over water, so that is unlikely to be the final landfall.
— Hurricane Central (@twc_hurricane) August 29, 2012

Stalls for about 8 hours just off Louisiana:

Even though the "official" motion is WNW, #Isaac has been stuck at 29.0 North latitude since the 7pm advisory.
— Hurricane Central (@twc_hurricane) August 29, 2012

Starts moving again, making second landfall:

Hurricane Isaac makes second landfall at 0215 CDT West of Port Fourchon, LA #Isaac
— Mike Bettes (@TWCMikeBettes) August 29, 2012

Levee overtopped in Plaquemines Parish:

Clarification...levee **overtopping** will result in deep water flooding in srn Plaquemines Parish.Alert:wxch.nl/NwoBtt #Isaac
— Hurricane Central (@twc_hurricane) August 29, 2012

Power outages growing rapidly:

Entergy: 377,813 people without power in LA...up another 20K from last hour #Isaac
— Maria LaRosa ☼ (@twcMariaLaRosa) August 29, 2012

Flooding in homes, over 12 feet:

MT @twc_shawn: Plaquemines Parish Pres. Bill Nungesser: "Report of 12' of water in people's homes. Something I've never seen before." #Isaac
— Hurricane Central (@twc_hurricane) August 29, 2012

Which is spreading up and down the Mississippi River Delta:

NWS: Jefferson Parish law enforcement reporting 5 feet of water in the Woodlawn Fire Dept. #LAwx #Isaac

— Shawn Reynolds (@TWC_Shawn) August 29, 2012

With 18 miles of levees overtopped, and water trapping people:

Guy Laigist, Plaquemines Parish EMA:"We have 18 miles...of levee that we know is overtopped...inundated 4-9' on that side." #Isaac

— Hurricane Central (@twc_hurricane) August 29, 2012

And it's only getting worse.