Low nighttime temperatures over the next couple of days aren’t going to make things easy for East Coast residents still without power after Superstorm Sandy and this week’s nor’easter.
But warmer daytime conditions will be ideal for recovery crews, including utility workers hoping to get many more homes powered and heated by this weekend.
Refresh this page for the latest updates or read the full CNN story here.
[Updated 10:28 p.m. ET]
[Updated 10:20 p.m. ET] Water that overtopped levees was trapped in Plaquemines Parish with nowhere to drain. Officials were considering intentionally breaching a levee downstream to allow some of the floodwater to flow back out of the inundated area, Gov. Bobby Jindal said.
Parish President Billy Nungesser said parish officials will go out at low tide to check the back levee - a second line of defense - at the town of Braithwaite and determine where to punch holes in it. It will be Saturday, at the earliest, before crews can cut the levee open, letting water flow out into the marsh.
[Updated 10 p.m. ET]
[Updated 9:52 a.m. ET] New Orleans officials said there had been 12 incidents of looting. Police said arrests were made in each case, but didn't specify how many people were involved.
[Updated 9:48 p.m. ET] Lake Pontchartrain's water levels are "beginning to stabilize," St. Tammany Parish officials said, according to the New Orleans Times-Picayune. Water had spilled out from the lake and flooded low-lying areas of the parish.
Rescues continue in areas around the vast Louisiana lake, including Lewisburg, Guste Island, Lacombe and Slidell, the newspaper's website reported.
[Updated 9:29 p.m. ET] Joey Amann gathered family and friends into his home in Hancock County, Mississippi, to ride out the storm, he told CNN affiliate WALA.
"You know, we just figured we'd be safer in numbers. Since our house is eight feet off the ground, we figured we'd be safer there but the water just kept coming," Amann said.
"It was scary. I mean, I've never seen the water raise this fast on this road and I've been here all my life. It just came out of nowhere."
The group ended up being rescued by emergency personnel in boats.
Amann told the station he lost his home to Hurricane Katrina in 2005.
"Thirty-six years I've lived here, and it's just devastating," he said. "Seven years ago, we were going through the same thing. No one thought it would be this bad, but it's worse than we anticipated."
Governments, business and residents in New Orleans and the central Gulf coast rushed Tuesday to complete last-minute preparations to bear the brunt of Hurricane Isaac.
The storm made initial landfall Tuesday evening as a Category 1 hurricane after graduating from tropical storm status Tuesday afternoon.
[Updated 11:29 p.m. ET]
[Updated 11:11 p.m. ET] Hurricane Isaac is "producing a dangerous storm surge" along the northern Gulf Coast, the National Hurricane Center said in its 11 p.m. ET update. Flooding from heavy rainfall will follow the storm surge, the NHC said.
At 11 p.m. ET, the storm's center of circulation was about 75 southeast of Houma, Louisiana, or 75 miles south-southeast of New Orleans, still moving at 8 mph with 80 mph maximum sustained winds.
[Updated 11:01 p.m. ET] Designer John Nelson created this fascinating and oddly beautiful visualization of every hurricane recorded since 1851. It's reproduced by Fast Company.
The image takes some getting used to, as it employs a southern polar projection; that is, Antarctica is in the center of the picture, with the other continents extending away from it. Hovering your mouse over the map enlarges an area so you can see greater detail.
[Updated 10:45 p.m. ET] Tropical Depression 11 rapidly intensified Tuesday evening and became the 11th named storm of the 2012 Atlantic hurricane season, Tropical Storm Kirk, the National Hurricane Center said. Kirk is located in the middle Atlantic and is not likely to become a threat to land.
[Updated 10:40 p.m. ET] Utility companies in four states report more than 200,000 customers have lost power because of Hurricane Isaac, all but 1,000 of them in Louisiana.
Thousands of people on the Gulf Coast have been told to leave ahead of Tropical Storm Isaac. Forecasters warn the storm will gain strength and is following the path Hurricane Katrina took seven years ago.
The tropical storm was expected to make landfall late Tuesday or Wednesday, coinciding with the seventh anniversary of Hurricane Katrina, though as a much weaker Category 1 hurricane, compared with 2005's monster storm.
Read the full CNN.com story here.
Natl Hurricane Ctr (@NHC_Atlantic) August 28, 2012
[Updated 5 a.m. ET Tuesday] Isaac is still a tropical storm and is located 125 miles from the mouth of the Mississippi River, moving northwest at 12 mph.
[Updated 4:35 a.m. ET Tuesday] The top sustained winds early Tuesday morning are 70 mph. The storm is expected to become a hurricane today.
#Isaac tip: Phone lines may be congested after a storm, so update your social networks or text family/friends to say you're OK.—
FEMA (@fema) August 27, 2012
[Updated 11:17 p.m. ET] The National Hurricane Center projected storm surges of 3 to 6 feet for the Florida Panhandle, 6 to 9 feet for the Alabama coast and 6 to 12 feet for the Mississippi and southeastern Louisiana shores.
[Updated 10:02 p.m. ET] Here's another way people can help their neighbors, at this location and others:
(@ASPCA) August 28, 2012
[Updated 9:54 p.m. ET] Mandatory evacuations are under way in the low-lying coastal areas of Mississippi's Hancock County, which includes Bay St. Louis and Waveland.
On the last weekend of winter, people were taking out their skis in Arizona and putting them away in Minnesota. They were putting on sweaters in Phoenix and stripping down to their shorts to ice fish near Fargo, North Dakota. They were calling out snowplows in the California desert and counting the millions left in their snow removal budget in Ohio.
There were real extremes in a record-breaking streak of weather across the country.
Here's how the topsy-turvy climate confounded convention:
Officials closed 180 miles of Interstate 40 across northern Arizona on Sunday as a winter storm dumped more than a foot of snow on the region. In Flagstaff, schools were closed Monday as the snow made travel hazardous.
But some snow-hungry visitors went to Flagstaff specifically for the snow, CNN affiliate KPHO-TV in Phoenix reported.
"We knew what the weather would be like up here so we made sure to keep all of our snow gear so we could come up here and play in the snow and have lots of fun," Jennifer Gregory told the station.
Geomagnetic and solar radiation storms hitting Earth after Tuesday's solar flares may not be as big as advertised, the National Oceanic and Atmospheric Administration said Thursday.
Together, such storms can affect GPS systems, other satellite systems and power grids, but none of these problems has been reported, even as the leading edge of the sun's coronal mass ejections from Tuesday hit Earth on Thursday morning, scientists said.
The geomagnetic storm has reached only G1 intensity on a scale from G1 (weak) to G5 (extreme), and the solar radiation storm is an S3 (strong) on a similar 1-to-5 scale, NOAA's Space Weather Prediction Center said. Earlier, NOAA had predicted a G3/S4 event.
Still, the solar radiation storm has prompted some airlines to divert planes from routes near the north pole, where radio communications may be affected and passengers at high altitudes may be at a higher than normal radiation risk.FULL STORY
Europe's deadly cold snap may have a lot to do with shrinking amounts of ice in the Arctic, a recent study suggests.
Nearly 300 deaths have been reported across the continent, with snow accumulations not seen in five decades reported in some places. Warsaw, Poland, has seen 11 days of temperatures well below average, with a coldest reading of 35 below zero Fahrenheit.
Scientists at the Alfred Wegener Institute for Polar and Marine Research in Potsdam, Germany, say the frigid, snowy European winter has its origins in a warm Arctic summer.
The U.S. National Oceanic and Atmospheric Administration reported that July 2011 was the fourth-warmest July on record. A warm summer in the Arctic cuts the amount of sea ice. NOAA reports that sea-ice levels last July were the lowest in three decades.
The effect is twofold, the Wegener scientists report.
First, less ice means less solar heat is reflected back into the atmosphere. Rather, it is absorbed into the darker ocean waters. Second, once that heat is in the ocean, the reduced ice cap allows the heat to more easily escape into the air just above the ocean's surface.
Because warmer air tends to rise, the moisture-laden air near the ocean's surface rises, creating instability in the atmosphere and changing air-pressure patterns, the scientists say.
One pattern, called the Arctic Oscillation, normally pushes warm Atlantic air over Europe and keeps Arctic air over the poles.
But in mid-January this year, the Arctic Oscillation abruptly changed, allowing the jet stream to plunge into Siberia and push cold and snowy weather over much of Europe.
Similar situations have emerged the past two years.
Check out some more reports on what this winter's been like, both in the U.S. and around the world: