(CNN) New evacuations were ordered Tuesday evening as more than a dozen wildfires raged across Northern California, with the largest ones killing at least 17 people as they scorched the state's famous wine country.

The largest of the deadly fires were burning in Sonoma, Napa and Mendocino counties, with flames ripping through the lush, picturesque landscape.

Officials in the city of Santa Rosa and Sonoma County called for the evacuations of five more areas Tuesday evening. Already, 20,000 people had been ordered to leave the area and other parts of Northern California.

It is too early to tell whether any of the wildfires were started by humans, said Ken Pimlott, director of Cal Fire. "All these fires are under investigation," he told reporters, adding that his department was focusing on rescues and firefighting. But he said the chance the fires were caused by lightning was "fairly minimal."

Here's what we know so far, according to California authorities.

• At least 17 people have died since Sunday night, when most of the fires began. A total of 11 deaths were in Sonoma County, officials said.

• Two of those who died were in Napa County, county spokeswoman Kristi Jourdan said. They were 100-year-old Charles Rippey and his wife, Sara, 98. They died when a fire engulfed their home near the Silverado Country Club north of Napa, Jourdan said.

Photos: Wildfires blaze in California Aerial images showing parts of Sonoma and Napa County that have been hit by wildfires. Hide Caption 1 of 33 Photos: Wildfires blaze in California Colby Clark, left, comforts her mother, Bonnie Trexler, after law enforcement escorted them to Trexler's home in Napa, California, to retrieve medicine and personal items on Wednesday, October 11. Trexler was one of the lucky few in her neighborhood whose home was spared. Deadly wildfires have been tearing through the state, destroying homes and businesses and prompting evacuation orders. Hide Caption 2 of 33 Photos: Wildfires blaze in California Highway Patrol officers go door to door to ask Sonoma residents to evacuate their homes as a wildfire approaches on October 11. Hide Caption 3 of 33 Photos: Wildfires blaze in California Homes are destroyed in the Coffey Park neighborhood of Santa Rosa on October 11. Hide Caption 4 of 33 Photos: Wildfires blaze in California The sign of a Firestone store malfunctions in Santa Rosa on Tuesday, October 10. Hide Caption 5 of 33 Photos: Wildfires blaze in California Damaged winemaking vats and tanks stand in ashes and debris at the Paradise Ridge Winery in Santa Rosa. Hide Caption 6 of 33 Photos: Wildfires blaze in California Smoke clouds the sun from wildfires burning in Santa Rosa and Napa Valley on October 10. Hide Caption 7 of 33 Photos: Wildfires blaze in California Mary Caughey, center in blue, reacts after finding her wedding ring in the remains of her home in Kenwood on October 10. Hide Caption 8 of 33 Photos: Wildfires blaze in California Puddles of melted metal trail away from a burned-out car near Napa on October 10. Hide Caption 9 of 33 Photos: Wildfires blaze in California A TV cameraman inches closer to a burning building at a winery in Napa Valley on Monday, October 9. Hide Caption 10 of 33 Photos: Wildfires blaze in California A firefighting plane helps battle a blaze just north of Tustin on October 9. Hide Caption 11 of 33 Photos: Wildfires blaze in California A historic barn burns in Santa Rosa on October 9. Hide Caption 12 of 33 Photos: Wildfires blaze in California The Santa Rosa Hilton Hotel burns to the ground on October 9. Hide Caption 13 of 33 Photos: Wildfires blaze in California Jim Stites watches as part of his neighborhood burns in Fountaingrove on October 9. Hide Caption 14 of 33 Photos: Wildfires blaze in California Fire burns from an open gas valve near the pool area of a Santa Rosa trailer park on October 9. Hide Caption 15 of 33 Photos: Wildfires blaze in California A man rushes to save his house as a wildfire moves through Glen Ellen on October 9. Hide Caption 16 of 33 Photos: Wildfires blaze in California Kristine Pond searches what's left of her family's home in Santa Rosa on October 9. Hide Caption 17 of 33 Photos: Wildfires blaze in California Police cars block State Route 241 as smoke rises above Orange on October 9. Hide Caption 18 of 33 Photos: Wildfires blaze in California A firefighter douses flames in Santa Rosa on October 9. Hide Caption 19 of 33 Photos: Wildfires blaze in California A woman moves horses in Orange as strong Santa Ana winds blow smoke from the Canyon 2 fire toward them on October 9. Hide Caption 20 of 33 Photos: Wildfires blaze in California A firefighter douses flames at a home in Anaheim on October 9. Hide Caption 21 of 33 Photos: Wildfires blaze in California Traffic backs up as people flee Orange on October 9. Hide Caption 22 of 33 Photos: Wildfires blaze in California Santa Rosa residents sift through the remains of a burned home on October 9. Hide Caption 23 of 33 Photos: Wildfires blaze in California The remains of fire-damaged homes and cars smolder at a Santa Rosa trailer park on October 9. Hide Caption 24 of 33 Photos: Wildfires blaze in California A tent structure built for the Safeway Open golf tournament burns in Napa on October 9. Hide Caption 25 of 33 Photos: Wildfires blaze in California Fire consumes a barn in Glen Ellen on October 9. Hide Caption 26 of 33 Photos: Wildfires blaze in California Smoke rises in the hills east of Napa on October 9. Hide Caption 27 of 33 Photos: Wildfires blaze in California A man passes a burning house in Napa on October 9. Hide Caption 28 of 33 Photos: Wildfires blaze in California The remains of fire-damaged homes are seen in Glen Ellen on October 9. Hide Caption 29 of 33 Photos: Wildfires blaze in California A wildfire burns behind the Sonoma Raceway on October 9. Hide Caption 30 of 33 Photos: Wildfires blaze in California A building burns in Napa on October 9. Hide Caption 31 of 33 Photos: Wildfires blaze in California Flames overtake a building in the Napa wine region on October 9. Hide Caption 32 of 33 Photos: Wildfires blaze in California Two women hug as they watch houses burn in Santa Rosa on October 9. Hide Caption 33 of 33

• About 2,000 homes and businesses have been destroyed by the fires in Northern California, the California Department of Forestry and Fire Protection said Tuesday.

• More than 100 people were being treated at Napa- and Sonoma-area hospitals for fire-related injuries or health issues, including burns, smoke inhalation and shortness of breath.

• Wildfires were burning more than 115,000 acres in California as of Tuesday.

• Most of the Northern California fires ignited Sunday night, driven by winds of more than 50 mph and dry conditions, Pimlott said Monday. The high winds led to "extreme rates of spread and volatile burning conditions," according to Cal Fire.

• More than 180 people are missing, but authorities think communications issues are making it impossible for many of those people to check in with family.

Destruction in Santa Rosa

Margaret Curzon said her parents lost almost everything in the wildfire that destroyed their home and the Coffey Park neighborhood in Santa Rosa, a city of about 175,000 roughly 50 miles northwest of San Francisco.

Her mom woke up early Monday morning and smelled smoke, but thought it was the neighbor's barbecue or chimney, so she went back to sleep. They woke up again because their bichon frise, Brady, was whimpering.

Her father looked outside and his first thought was that there was some sort of bomb, or an attack.

"It looked like we were at war," Curzon said. "The sky was orange and there were embers falling from the sky."

Curzon said her parents had five or 10 minutes to grab their two dogs and anything else they could and escape.

She said it took about a half-hour to get out of their neighborhood because cars were bumper to bumper.

"He could feel the car getting hotter and hotter because the fire kept creeping up and getting closer to them," she said.

The only thing that remained at her house was a concrete statue of the Virgin Mary, Curzon said after visiting the home site later Monday.

Almost nothing is left of a home in Santa Rosa, California.

The devastation was significant in Santa Rosa. Fire leveled subdivisions and reduced cars and homes into burnt piles of ash and rubble.

Nearly 5,000 people were staying in Sonoma County shelters, county spokesman Scott Alonso said Tuesday.

A large part of Santa Rosa was evacuated, including Kaiser Permanente Hospital and Sutter Hospital . Authorities imposed a sundown-to-sunrise curfew for the northern and eastern parts of the city under evacuation orders.

Janice Abdalla captured this image of fires on a Monday flight into San Francisco International Airport.

"We are asking people to stay indoors" because of smoke, Alonso said.

There is no rain in the forecast this week, according to the National Weather Service. Winds in the next two days will come out of the north at around 10 to 20 mph with higher gusts of 35 to 40 mph possible, CNN Meteorologist Michael Guy said.

'Wine doesn't matter. People matter.'

The biggest blaze was the Tubbs fire , at 27,000 acres, stretching from Santa Rosa to the Calistoga area in Napa County.

Napa County also had the Atlas fire at 25,000 acres and the Partrick fire at 1,000 acres.

In Sonoma County, firefighters battled the Tubbs fire in Santa Rosa, the Nuns fire at 5,000 acres and another fire that spread across 2,000 acres.

In Mendocino County, the Redwood Complex fire had burned at least 21,000 acres, as of Tuesday.

Large wildfires often are named for local geographic areas or features.

The Atlas fire destroyed several homes near the Silverado Country Club north of Napa, CNN affiliate KPIX reported , including the house where the Rippeys died.

Also in that area, fire burned the main building of the Signorello Estate Winery to the ground. Broken and charred wine bottles remained on seared metal shelves, video from KPIX showed.

Parts of northern California have been ravaged by intense wildfires that have now consumed ~100,000 acres of land: https://t.co/lIcpfpN9Yb pic.twitter.com/mHOAOqJRKa — NASA (@NASA) October 10, 2017

But parts of it were under a boil-water notice Tuesday, because fires destroyed a pump station near the Silverado resort and rendered a water treatment plant inoperable, The city of Napa, with about 80,000 residents, was not under evacuation.But parts of it were under a boil-water notice Tuesday, because fires destroyed a pump station near the Silverado resort and rendered a water treatment plant inoperable, the city said . Many in Napa also lost power and cell service, according to the Napa police.

Alison Crowe, the winemaker for Garnet Vineyards & Picket Fence Vineyards in Napa Valley, estimated two-thirds to three-fourths of the grape harvest already had taken place but said some grapes still haven't been picked. The 2017 harvest will be remembered for this fire, she said.

"Wine doesn't matter; people matter," she said Monday. "I know that's people's attitude right now."

Napa and Sonoma counties have the most wineries in California. The economic impact from the wine industry was estimated at $13 billion for each county, according to 2012 and 2014 research done by Stonebridge Research Group.

Fires fueled by wind and dry conditions

Authorities have noted windy and dry conditions Sunday and Monday made it easy for the fires to spread. October is typically the busiest month for wildfires in California, they said.

Complicating firefighting efforts was a shortage of resources, Napa County Fire Chief Barry Biermann said Tuesday.

"We have folks on the fire line starting their third shift right now that have not been relieved," Biermann said Tuesday, "because there's folks not available to come in, with so many fires in the area."

Gov. Jerry Brown on Monday issued emergency proclamations for Napa, Sonoma, Yuba, Butte, Lake, Mendocino, Nevada, Solano and Orange counties. Orange County in the south is dealing with a 7,500-acre fire that has destroyed 14 structures, damaged 22 and threatens 5,000 others, Orange County fire Capt. Larry Kurtz said.

Pictures from Disneyland in Anaheim on Tuesday afternoon showed the sky with an orange glow.

A post shared by Brian M. Whittington (@modernexample) on Oct 9, 2017 at 2:07pm PDT

The White House said President Donald Trump has signed a major disaster declaration and fire management assistance grants for the state.

"The loss of homes and burning of precious land is heartbreaking but the loss of life is truly devastating," press secretary Sarah Sanders said.