Fox News anchor Gregg Jarrett was just about to go on-air for “Studio B” on Thursday, when he was filling in for Shepard Smith . Minutes before air, he got a call: the schools in Mamaroneck, New York were on lockdown after a man with a gun tried to enter a middle school.

“it is unnerving for any parent, but they are being told ‘don’t go to the school,’ don’t pick up your child as yet.’”

Jarrett’s daughters both attend schools that were locked down, and he would cover the incident later in the program:

Fox News Channel is blowing up its primetime programming to provide coverage of Hurricane Sandy’s landfall. “Hannity” will air as normal at 9 PM, but every other program is affected by the changes. There will be live coverage going through tomorrow morning, where “Fox & Friends” will pick things up.

Tonight’s lineup:

“Fox Report” 7-9pm
“Hannity” 9pm
“On the Record” 10-midnight
“America’s News Headquarters special coverage of Monster Storm,” co-anchored by Gregg Jarrett and Heather Childers midnight to 4am
“Fox and Friends First” will begin again at 4am tomorrow
“Fox and Friends” 6-9am

After the jump, an update on where some of FNC’s correspondents are.

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Hurricane Isaac is expected to make landfall overnight tonight on the Gulf Coast, and you can bet that cable news channels are planning special live programming to cover it. Weather Channel, CNN and Fox News Channel will be live overnight in the hours normally reserved for repeats.

Weather will have live coverage throughout the night, with Reynolds Wolf and Jim Cantore in New Orleans, Mike Seidel in Alabama and Paul Goodloe and Eric Fisher in Mississippi. Locations are subject to change, if Isaac’s path changes.

Fox News will be live from 1-4 AM, with Gregg Jarrett and Jamie Colby anchoring. The network is sending “Fox & Friends First” anchor Anna Kooiman to Baton Rouge, joining Elizabeth Prann, Jonathan Serrie and Casey Stegall in New Orleans. Steve Harrigan is in Biloxi, MS, Rick Leventhal is in Dauphin Island, AL, and Phil Keating is in Mobile, AL.

CNN will have a live edition of “Piers Morgan Tonight at midnight (it was already planned for the RNC), and will add live coverage from 1-4 AM. “Early Start,” which normally begins at 5 AM, will start even earlier at 4 AM tomorrow.

Update: MSNBC will be live til 1 AM with live coverage of the RNC and Isaac. An overnight decision will be made soon.

Update AM: MSNBC ended up replaying its primetime programming through 3 AM, and rerunning the RNC speeches beginning at 3. It broke into programming twice an hour with Hurricane Isaac updates.

We’ll update with more information as we get it.

Voters in 10 states head to the polls tomorrow to weigh in on the next GOP Presidential candidate. Here’s the plan for Super Tuesday coverage on the broadcast and cable news and business networks.

The broadcast networks:

• “Nightly News” anchor Brian Williams will helm a one-hour special on NBC News from 10-11pmET. Williams will also present live updates on the voting results between 7-10pmET as news dictates. “Nightly” will be updated for later feeds throughout the evening.
• Diane Sawyer and George Stephanopoulous will anchor special reports on ABC beginning at 7pmET. “World News” will also be updated for later feeds. At 11:35pmET, Terry Moran will anchor a special edition of “Nightline.”
• On CBS, Scott Pelley will provide live primetime updates throughout the night.
• Gwen Ifill and Judy Woodruff will anchor a live “PBS Newshour” at 11pmET.
• On FOX, Shepard Smith will anchor live updates from 8-11pmET.

The cable networks:

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Heather Childers, who joined Fox News Channel in February from Charlotte’s News 14, has been named anchor of the weekend afternoon editions of FNC’s “America’s News Headquarters,” the Charlotte Observer reports.

Childers, a New York-based reporter, has been filling in on the 4-6pmET block alongside Gregg Jarrett.

Three cable networks changed up their Sunday morning schedules to carry the closing arguments in the murder case against Casey Anthony. HLN, which has been in gavel-to-gavel coverage since the start, along with Fox News and MSNBC, are in the midst of coverage.

The prosecution began its closing argument around 9:15amET and concluded around 10:35am — 77 minutes of the four hours they are allotted. The jury was given a 15-minute recess — which stretched to 40 minutes for an issue related to the defense closing argument. Defense attorney Jose Baez then began his closing just after 11:15am. The prosecution will have a chance for rebuttal this afternoon, which could change up the afternoon schedules on the cablers. CNN remained with its regular Sunday morning programming.

> Monday, July 4 Update: The prosecution rebuttal began this morning just after 8:30amET carried live on HLN, MSNBC and Fox News. A 20 minute break was called around 9:40am with the prosecution expected to return at 10am. Deliberations could begin today around NoonET.

> At 10:44am, as the prosecution played a jailhouse call Casey made to her mother, Casey used the word “fucking” five times, which went out over the air. FNC anchor Gregg Jarrett jumped in to “apologize” to viewers as the network put the testimony on a 7-second delay.

For the second week running, Fox News Channel will have special daytime coverage of the Casey Anthony trial Saturday morning displacing the business block of programming.

In place of “Cost of Freedom,” FNC anchor Gregg Jarrett will host trial coverage beginning at 10amET with a legal panel including Judge Alex Ferrer and Peter Johnson, Jr. Jarrett will hand off the anchoring duties to Eric Shawn at 2pm.

Last Saturday, an unexpected recess in the court proceedings left cable networks scrambling to amend their planned coverage. On Thursday the defense rested their case. Gavel-to-gavel coverage of the trial has drawn big cable ratings, particularly for HLN.

NBC News calling a changeup in the way it produces this morning’s Pres. Obama news conference. Obama will hold a news conference at 11:30amET in the East Room. Because NBC is carrying Wimbledon semi-finals, NBC’s Brian Williams will anchor a special report on MSNBC. Williams will then anchor a 3-minute nationwide special report for NBC stations at 1:57pm in each time zone.

ABC and CBS will produce a special report for any station that chooses to carry it. For ABC, George Stephanopoulos anchors. On CBS Scott Pelley is in the chair. FNC’s Gregg Jarrett will anchor a “level 2″ special report for FOX stations.

Pres. Obama’s last full-blown news conference was in March, when Libya and the potential government shutdown were in the headlines.

The cable news channels — beyond HLN — were prepared to listen in to the defense’s 8th day of their case in the Casey Anthony trial but JudGe Belvin Perry recessed today’s proceedings for a “legal issue” without going into detail. The judge has been holding court on previous Saturdays for this case.

Fox News anchor Gregg Jarrett, who is a lawyer, was brought in to anchor coverage of the trail bumping the regular two-hour Saturday morning business block “Cost of Freedom” to tomorrow afternoon at 2pmET.

CNN anchor T.J. Holmes had defense attorney Holly Hughes in studio ready to watch and comment on this morning’s proceeding. “Both of us, we’re standing by waiting to watch the testimony,” said Holmes, “I looked at you and you looked at me and both our mouths go — what just happened?”

All three cable news channels covered the rescue of the trapped miners in Chile in the late evening. On the broadcast networks, ABC’s Diane Sawyer broke into regular programming with a special report just after 11 PM ET when the first miner was pulled from the ground.

Overnight, CNN and MSNBC were live  covering the rescue of the trapped miners in Chile.

MSNBC had Chris Jansing anchoring from 1 AM until “Morning Joe.” Jansing was back on the air at 10 AM this morning, wearing the same outfit she wore overnight.

CNN went to a simulcast of CNN International starting at 1 AM ET and running until “American Morning” started at 5 AM.

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