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 A freight train overturned on waterlogged tracks Saturday morning in Texas as heavy rains pounded the region for a third straight day — with remnants of Hurricane Patricia threatening to keep a large part of the state under a flash flood watch. 
 
 One person, a man walking his dog in San Antonio, was missing as a result of the floods, authorities said. 
 
 Patricia was downgraded Saturday to a tropical depression after making landfall in Mexico Friday evening. But many parts of Texas were still expecting significant rainfall. 
 
 A train overturned in floodwaters in Navarro County, Texas. NBC News 
 
 Houston Mayor Annise Parker warned that 8 to 10 inches of rain were expected overnight. 
 
 In addition, Houston, Corpus Christi, and other portions of southeast Texas were under a tornado watch until 10 p.m. CT, according to the Weather Channel. 
 
 Two train crew members were rescued after a Union Pacific train derailed around 3:30 a.m. local time in Navarro County south of Dallas, officials told NBC Dallas-Fort Worth. Union Pacific spokesman Jeff DeGraff told the station that one locomotive and several rail cars were partially submerged, but no one was injured. 
 
 Both crew members "swam to high ground" and were pulled out by a high-water rescue team, DeGraff said. 
 
 The 64-car train was en route from Midlothian to Houston when it got caught in floodwaters, which have closed major highways throughout North Texas. 
 
 Related: Hurricane Patricia to Intensify Heavy Rains in Texas, 10M Under Flood Watch 
 
 The train remained on its side on Saturday, about 4 miles north of Corsicana, as authorities waited for the water to recede before attempting to right it and remove it from the tracks. 
 
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 Eric Myers, emergency management coordinator for Navarro County, told NBC News the tankers contained cement. He said that the county had received 20 to 21 inches of rainfall in the past 24 hours, and said authorities had performed 72 swift water rescues. 
 
 Interstate 45 near Corsicana was closed for several hours Friday night, creating traffic backups that were miles long. 
 
 Elsewhere in Texas, heavy rainfall was causing power outages and flight delays. In San Antonio, emergency responders were searching for a man who was swept away Saturday around 3 a.m. local times (4 a.m. ET), The Associated Press reported. The man fell into a flooded drainage ditch while trying to pull his dog back. 
 
 The dog was found, but firefighters had to suspend the search for his owner due to the weather. 
 
 Strong thunderstorms dropped more than 7 inches of rain across Dallas-Fort Worth, NBC Dallas-Fort Worth reported, with flash flood watches and warnings in effect in many places until Sunday. 
 
 The remnants of Patricia — which made landfall Friday evening in southwestern Mexico as a Category 5 storm — are expected to reach Texas by Saturday night and exacerbate the flooding, forecasters said. 
 
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 "It should start to move out Sunday night, but East Texas is going to still be in the rain Sunday night, even Monday," Jon Rowe, senior meteorologist for The Weather Channel, told NBC News. "There will be some lingering rain showers even by Tuesday." 
 
 The heaviest of the rain should be done by Sunday night, he added, "but they're going to have flooding problems in South and East Texas at least through tomorrow." 
 
 Hundreds of flights were canceled or delayed on Thursday and Friday at Dallas-Fort Worth International Airport. The airport got 3.24 inches of rain on Friday alone — a daily record. ||||| DALLAS (AP) — A powerful storm system rumbled through Texas on Saturday, flooding roads and causing a freight train to derail as parts of the state braced for the remnants of Hurricane Patricia to arrive. 
 
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 Many parts of Texas, including some of its biggest cities, were under flash flood watches through Sunday or Monday. The remnants of Patricia, which was downgraded to a tropical depression and was expected to reach northern Mexico by Saturday night, may add to the rain falling in South and Central Texas, said Jesse Moore, a National Weather Service forecaster in Fort Worth. 
 
 The storm system already moving through Texas dumped nearly two feet of rain on parts of the state since Friday, causing flooding that blocked several major roadways. 
 
 Galveston County Judge Mark Henry on Saturday issued a voluntary evacuation for Bolivar Peninsula, just northeast of Galveston Island, after forecasters predicted that the area would get 8 to 12 inches of rain and tides that are 4 to 5 feet high. 
 
 The judge warned that residents who don't leave might find themselves cut off from emergency services as the heaviest winds and rains come ashore. The storm was expected to reach the area by around 6 p.m. Saturday. 
 
 "Elderly residents and people with medical conditions should make plans to leave the area before dark," Henry said. 
 
 County spokeswoman Brittany Rainville said there were buses waiting to evacuate people, but no one had yet shown up to leave as of early Saturday afternoon. She said about 4,000 people live on the peninsula. 
 
 In San Antonio, a man walking his dog before dawn early Saturday was swept into a flooded drainage ditch and disappeared, fire officials said. Firefighters searched for two hours but had to stop due to bad weather. They planned to resume as soon as possible. The dog is safe. 
 
 A driver in the Central Texas town of Temple heading to work Saturday morning was saved after he was able to get out of his car that was floating in floodwaters and grabbed a tree. Temple police say the man called 911 from his cellphone to summon help. Firefighters retrieved him and walked him to safety. 
 
 A Union Pacific freight train derailed before dawn on Saturday near Corsicana, about 50 miles south of Dallas, because a creek overflowed and washed away the tracks, said Jeff DeGraff, a railroad spokesman. The two crew members swam to safety and nobody was hurt, he said. 
 
 "They (crew) escaped the train after it stopped and swam to high ground," DeGraff said. "A Navarro County rescue team was able to get in and pull them to safety, they are back safe on dry ground." 
 
 One locomotive and several rail cars loaded with gravel went into the water and were partly submerged, DeGraff said. He had no specifics on how many cars derailed because crews couldn't reach the site due to flooding. 
 
 Authorities on Saturday morning reopened a section of Interstate 45 near Corsicana that was closed overnight due to flooding, backing up traffic for 12 miles. Moore said that since Friday morning, Corsicana has received 18 inches of rain and Powell has received 20 inches. 
 
 Flight tracker flightaware.com reported that about 100 Saturday flights had been canceled at Dallas-Fort Worth International Airport. 
 
 A flash flood watch was in effect for the Waco, Austin, San Antonio, Corpus Christi, Laredo and Brownsville areas through Sunday morning, according to the National Weather Service. The flash flood watch for Dallas and Fort Worth was lifted Saturday afternoon. 
 
 Forecasters say Houston and Galveston remain under a flash flood watch through Monday morning, with possible coastal flooding concerns. 
 
 Patricia was the most powerful hurricane on record in the Western Hemisphere and made landfall Friday along Mexico's Pacific Coast as a Category 5 storm. It quickly lost power as it moved inland and appeared to have caused remarkably little damage. 
 
 ___ 
 
 Associated Press writer Diana Heidgerd contributed to this report. 
 
 ___ 
 
 This story has been corrected to reflect that Patricia is no longer considered a tropical storm and has been downgraded to a tropical depression.
– Two crew members had to be rescued when flooding in Texas overturned a 64-car Union Pacific freight train on its way to Houston early Saturday morning, NBC News reports. Navarro County, where the train was derailed around 3:30am local time, had received nearly 2 feet of rain in 24 hours, and more was expected with what's left of Hurricane Patricia heading into the area. According to the AP, a creek overflowed and washed away the train tracks. "[The crew] escaped the train after it stopped and swam to high ground," a Union Pacific spokesperson tells the AP. "A Navarro County rescue team was able to get in and pull them to safety. They are back safe on dry ground." Despite several rail cars and a locomotive ending up partially underwater, no injuries were reported in the train crash, NBC reports. The train—which is carrying cement or gravel—was still on its side hours later, with crews waiting until water levels drop before they attempt to remove it. After three days of heavy rains, Navarro County has carried out five dozen water rescues. According to the AP, only one person is missing so far in the recent Texas flooding. A man walking his dog in San Antonio fell into a flooded draining ditch and was swept away. His dog was later found safe.