KNOW IT ALL: Thursday's Top 7 Stories at NBC New

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Good morning. Here are some of the stories we're following today:

1. ‘November Witch’ Brews Nasty Weather

It's called the "Witch of November," and it's casting its spell on millions — threatening severe gusty winds and thunderstorms across the Upper Midwest and Ohio Valley through Friday. Already, the system has spawned 10 suspected tornadoes, flooded streets and knocked out power to tens of thousands across Iowa, Nebraska and Missouri. Read more in NEWS.

2. Kurds Aim to Retake Iraq Town From ISIS

Kurdish fighters launched an assault Thursday aiming to retake the ISIS-held strategic town of Sinjar. ISIS had overrun Sinjar last year in an onslaught that caused the flight of tens of thousands of ethnic Yazidis and first prompted the U.S. to launch airstrikes against the militants. Read more in NEWS.

3. ISIS-Linked Suspects Held in European Sweep

Sixteen terror suspects have been arrested in a coordinated sweep, as police forces in Italy, England, Norway, Finland, Germany and Switzerland helped to roundup the accused extremists. The group is alleged to have planned an attack targeting Norwegian and British diplomats in the Middle East. Read more in NEWS.

4. Missouri Professor’s Resignation Rejected

A popular University of Missouri professor submitted a letter of resignation Wednesday following an uproar over an email he sent to students telling them they would have to take an exam despite threats of campus violence. But the school said it wasn't accepting his letter. Read more in NEWS.

5. Why Do College Kids Love Social Media App Yik Yak?

A man arrested Wednesday for allegedly making death threats against black students who attended the University of Missouri is only the latest case involving a college student using the social media app in a harmful way. But its anonymous feature is what makes it so popular. Read more in TECH.

6. Unarmed Virginia Man Tased, Dies in Cop Custody

The case of Linwood Lambert, who died in a Virginia police squad car in May 2013, is being scrutinized again in a new investigation that includes publicly released video from that day. Read more in NEWS.

7. Trump Says Bring Back Controversial 1950s Program

During Tuesday night's Republican presidential debate, front-runner Donald Trump touted the controversial 1950s "Operation Wetback" program as a way of dealing with the nation's undocumented immigrants. While he didn't call the program out by name, its reference was roundly criticized. Read more in LATINO.

Nightly Spotlight

The rare, flawless blue diamond fetched the highest price ever paid for a gem at auction at Sotheby’s in Switzerland — just how much?

Breaking News Emails

Get breaking news alerts and special reports. The news and stories that matter, delivered weekday mornings.