A flash flood watch was issued Monday for all of southeast Louisiana through Thursday evening, with 5 to 10 inches of rain expected in association with Tropical Storm Harvey.
The National Weather Service in New Orleans said southeast Louisiana could see moderate to brief periods of heavy rain Monday, setting the stage for higher rainfall totals throughout the week.
Heavier rainfall could become a greater concern Monday night if rain bands develop and become stationary, the National Weather Service said.
At 10 a.m. Monday, the center of Harvey was moving slowly to the southeast near the Texas coast at 5 mph. A gradual turn toward the northeast and a continued slow forward speed are expected Tuesday. Harvey should remain offshore of Texas through Tuesday night.
Some “slow intensification” is possible during the next two days, the National Hurricane Center said.
Overall, rainfall amounts of 5 to 10 inches are expected in southeast Louisiana, according to the National Hurricane Center.
Locally higher amounts are possible, and the forecast is subject to change based on Harvey's track. Most of the rain is likely to come from intense rain bands, which can be difficult to forecast in terms of timing, location and intensity.
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"It is critically important for the people of Louisiana, particularly those in Southwest Louisiana, to recognize that we are not out of the woods," Louisiana Gov. John Bel Edwards said Sunday. "I am asking all Louisianans to remain vigilant and pay attention to your local news. Louisiana will remain in this storm’s path for the next week, from Southwest Louisiana to North Louisiana. Forecasts show this storm system making its way closer to Louisiana over the next 48 hours and causing heavy rainfall and potentially life-threatening flooding. We are closely monitoring this storm system and coordinating with our local and federal partners."
Rainfall of more than 4 inches per hour Saturday in the Houston area resulted in water levels higher than in any recent floods and higher than during Tropical Storm Allison in June 2001, said Jeff Linder of flood control district in Harris County, which includes Houston.
The latest forecasts showed that 15 to 25 more inches was possible over the next several days, with some places getting as much as 50 inches total.
The Associated Press contributed to this report.