The National Weather Service has issued a blizzard warning starting with drive time Tuesday morning. Meanwhile. Missouri Gov. Jay Nixon has declared a state of emergency in advance of what the Missouri Department of Transportation calls a storm of “historic” proportions.

At mid-afternoon today, the Weather Service issued the warning, which is for 6 a.m. Tuesday to noon Wednesday. It says the storm developing today in and around the Kansas City area could be dangerous. The current freezing drizzle is expected to turn to snow – perhaps as much as a foot – and it will get cold.

“A powerful and potentially life-threatening storm” is what the Weather Service describes in a winter storm warning posted this morning. A blizzard, by definition, includes winds of 35 mph or more with considerable snow – either falling or already fallen and now blowing.

The blizzard warning covers 34 counties in Missouri and Kansas – including all of the Kansas City area – from Paola and Leavenworth in Kansas to Plattsburg, Bethany, Kirksville, Boonville, Sedalia, Clinton and Butler in Missouri. The warning excludes St. Joseph and Lawrence.

The governor ordered emergency generators moved to sites around the state over the weekend. Today, he declared an emergency and activated the Missouri National Guard, which is to work with local officials to see where help is needed. The State Emergency Operations Center will be open around the clock. MoDOT suggested that people help by staying off the roads as much as possible.

Today’s immediate issue is ice. The freezing drizzle made streets and sidewalks slippery and treacherous.

Some snow is expected tonight, maybe an inch. Tuesday is when the heavy stuff hits: 7 to 11 inches of snow, with gusty winds and a high of 20. The chance of precipitation is 100 percent during the day and night. The low will be about 6, with wind-chill values of minus 4 to minus 14. Winds gusts up to 39 mph.

On Wednesday, the snow will blow around, the high will only be about 9. The low Wednesday night could be minus 10.

For the rest of the week, it should be clear but cold. The temperature might get above the freezing mark – barely – on Sunday.

For weather information: www.crh.noaa.gov/eax/

Get ready for bad weather: kcpl.com/stormcenter

Information also is available by dialing 211.

If you encounter an accident while driving, call the Missouri State Highway Patrol’s emergency line at *55.

The Missouri Department of Transportation traveler information map is at www.modot.org/