SAN FRANCISCO (KGO) -- Hurricane Hilary has downgraded to a tropical storm as it gain speed off Mexico's Pacific coast. It could bring heavy rain to the southwestern U.S. by the end of the weekend. There will be a threat of flooding rains across Southern California from Sunday through Tuesday. The U.S. National Hurricane Center said a tropical storm watch has been issued for Southern California, the first time that has ever been done.
HURRICANE HILARY
Hurricane Hilary is now a tropical storm downgrading from a category 1 storm Sunday morning with winds at 70 miles per hour as of 8 a.m. according to the National Weather Service.
Hilary will rapidly weaken as it enters cooler ocean waters and interacts with the mountain terrain of Baja California Sunday.
The current track has Hilary moving into Southern California late Sunday into Monday as a tropical storm. Life-threatening and potentially catastrophic flooding is possible. For the first time ever, Tropical Storm Warnings have gone up for Southern California.
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No tropical storm has made landfall in Southern California since Sept. 25, 1939, according to the National Weather Service.
Hilary was centered about 95 miles west-northwest of Socorro Island. It was moving northwest at 12mph.
OCEAN TEMPERATURES
Hurricanes require ocean temperatures above 80 degrees to survive. Hilary is currently sitting in 85-degree water and will remain in those warm waters through Saturday. As Hilary moves closer to Baja California, ocean temperatures will quickly cool into the 70s and eventually the 60s along the California coast.
That temperature drop may not seem like a lot but ocean temperatures in the 70s will essentially kill Hilary and water in the 60s will never support a tropical system. Thus, we see a very rapid weakening as the system approaches the California-Mexico border.
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HEAVY RAIN THREAT IN SOCAL
The moisture from Hilary will bring the possibility of excessive flooding in Southern California.
The National Weather Service issued a flood watch that will be in effect starting at 11am tomorrow through Monday evening across San Diego and Los Angeles counties. Rainfall amounts of 3 to 6 inches, with isolated amounts of 10 inches, are expected across portions of southern California and southern Nevada, which would lead to significant and rare impacts. Elsewhere across portions of the Western United States, rainfall totals of 1 to 3 inches are expected.
Rough surf and strong winds will also impact Southern California.
CENTRAL VALLEY IMPACTS
The Central Valley is forecasted to have remnants of rain and thunder from Hurricane Hilary by Monday and Tuesday.
Portions of the South Valley could first experience rainfall by Monday morning. The rest of the Central Valley will see a chance of thunderstorms by Monday afternoon.
Projected rain totals continue to change as the Valley is still a few days out from the storm, with the possibility of Hilary also downgrading.
BAY AREA IMPACTS
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The current track of Hilary keeps the bulk of the moisture in Southern California and the Sierra but, we still have a possibility of seeing isolated showers here Sunday and a chance of showers Monday. Remnants of Hilary will bring higher humidity and tropical cloud cover between Sunday and early next week.
We will monitor the track of this storm and any small shifts would mean an increased chance of rain here. That is something we will fine-tune in the coming days.
The Associated Press contributed to this report.
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