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WASHINGTON (WUSA9/AP) -- Here are five things you need to know on Wednesday, April 16:

5. Cold air remains in place behind Tuesday's cold front. Chilly temperatures greet you Wednesday morning with below-freezing temperatures for most. Plenty of midday sunshine, but northerly winds make it feel like it's in the 20s! On Thursday, an east wind behind Tuesday's system keeps clouds around and holds cooler temperatures in place.

FORECAST: Temps drop below freezing in the Metro

4. District of Columbia leaders and residents are preparing to celebrate a holiday that's unique to the nation's capital. D.C. Emancipation Day commemorates the date in 1862 when President Abraham Lincoln freed all slaves in the city. Lincoln signed the Emancipation Proclamation nine months later.

MORE: DC to celebrate Emancipation Day

3. A trial board has now been set for three firefighters who stood by as an elderly D.C. man died. They were among five firefighters on duty at a Rhode Island Avenue station on January 25, when Medric Cecil Mills collapsed from a heart attack right across the street.

VIDEO: Trial board set for 3 DC firefighters

2. The Virginia Supreme Court is set to hear the appeal of a former Democratic activist from Falls Church who was convicted of molesting two children. Michael Gardner is serving 22 years in prison for aggravated sexual battery and object penetration. The Supreme Court will hear his appeal Wednesday morning.

MORE: Va. justices to hear former Dem activist's appeal

1. A solemn anniversary will be marked throughout the day on the Virginia Tech campus in Blacksburg. Seven years ago Wednesday, a student went on a rampage that started with killing two students a dorm room followed by a shooting spree in classroom buildings that claimed 30 more lives.

MORE: Va. Tech massacre's 7th anniversary to be marked

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