The flooding situation is worsening across the Southwest, as the caboose of a relentless storm train swings inland through tonight. Strong thunderstorms threaten to create additional problems.
This last round of torrential rain will continue to inundate an area from central and Southern California to southwestern Utah and northwestern Arizona into tonight.
The ground across this zone is already extremely saturated following rounds of torrential rain that began last Friday. The latest soaking will only worsen the situation.
Governor Arnold Schwarzenegger declared a state of emergency in six counties of Southern California Tuesday due to the extreme weather conditions.
As AccuWeather.com Meteorologist Heather Buchman reported on Tuesday, this final storm in the series will send "rainfall totals for this entire event ranging from 5 inches to 2 feet in central and southern parts of California."
In addition to the heavy rain, snow will continue to pile up in the Sierra and the mountains outside of Los Angeles into tonight.
"It's not a matter of if more flooding occurs, it is how bad it will become," stated AccuWeather.com Western Expert Meteorologist Ken Clark.
Rivers and streams will rise farther out of their banks, threatening to wash away roads and bridges. Homes bordering these waterways are also in danger of getting destroyed.
Downtown Laguna Beach, Calif., suffered significant flooding early Wednesday morning as excessive runoff sent several feet of water rushing over city streets.
Destructive mudslides and debris flows remain a serious concern, especially along the southern and western slopes of the mountains and in areas recently burned by wildfires.
Officials have reportedly ordered the evacuation of more than 230 homes in Los Angeles County.
Any motorist who considers crossing a flooded roadway should remember that it takes as little as 1 foot of rushing water to sweep a vehicle away. This includes pickup trucks and SUVs.
Even where flooding does not ensue, motorists should use caution. Water ponding on roads will heighten the risk of vehicles hydroplaning at highway speeds. Those planning to travel on interstates 5, 10, 15 and 40 are at risk.
A car moves through a flooded area of Los Angeles on Monday, Dec. 20, 2010. (AP Photo/Jae C. Hong) Upload your storm photos on the AccuWeather.com Facebook page.
Locally strong thunderstorms will pose an added danger to the Southwest. These thunderstorms could unleash even heavier bursts of rain, gusty winds, hail and an isolated tornado.
Due to the saturated ground, gusty winds could have an easier time bringing down trees.
An end to the relentless train of storms will finally come to California tonight as rain, thunderstorms and mountain snow become centered over Arizona and Utah. Flooding issues could arise in Phoenix.
Another storm system will bring more heavy rain and flooding to northern Pakistan and India this week.
While portions of the mid-Atlantic have enjoyed a day or two of spring warmth in March, most of New York and New England will finally break out of the persistent winter chill.
A pattern change during the middle of April could bring rain and cooler conditions to California, while erasing persistent chill in the Northeast.
It was a very active day Monday along the "Ring of Fire," the zone of seismic activity in the Pacific Basin.
As Monday morning ushered in dark skies near the Columbia, South Carolina, area, onlookers were treated to a unique cloud formation known as asperatus clouds.
It is no joke that severe weather will take aim at the central Plains on Wednesday, April Fools' Day.
Early heat wave, but the heat was welcome after a bitterly cold January. Binghamton, NY, reached 82 degrees, a new March record. Another March record was set in Hartford, CT, as the mercury there soared to 87. Baltimore Airport had a record high of 87, also a March record.
Flooding as a result of heavy rain on top of a heavy snowpack. Homes in Huntingdon county along the Juniata River were evacuated.
Philadelphia, PA (1998)
86 degrees; only 10 short of March record set March 29, 1945.