California is on high alert for potentially deadly flooding as Tropical Storm Rachel approaches Southern California, promising heavy rain, flash floods, and strong winds.
On Saturday, the National Weather Service issued a serious warning, indicating that the storm could lead to widespread flooding, necessitate evacuations, and disrupt infrastructure like roads and bridges.
The weather service stated, “Prepare for life-threatening rainfall flooding that may have extensive impacts across San Diego County.”
Evacuations and rescues could become necessary as major flooding is expected, with rivers and tributaries at risk of quickly overflowing. The warning noted that floodwaters might infiltrate various structures in many communities, potentially rendering some uninhabitable or even swept away. Additionally, essential infrastructure like bridges and roads could face significant damage.
As of late Saturday morning, rain bands were already moving into Orange and San Diego counties, with meteorologists predicting that the worst conditions might hit by Sunday.
Estimates suggest that Rachel could bring 1 to 2 inches of rain to coastal regions, valleys, and deserts, with the mountains possibly receiving as much as 2 to 4 inches. The National Weather Service expressed confidence that the most intense rain would strike the mountains and deserts of San Diego County.
Flash and urban flooding are likely, especially in areas experiencing significant rainfall rates. Additionally, a 40% chance of excessive rainfall could lead to flash floods in Riverside and San Bernardino counties, including areas like Palm Springs and Joshua Tree National Park.
Wind gusts of 39 to 73 mph are also anticipated, which could uproot trees, break branches, and even down fences and road signs. These strong winds could create hazardous driving conditions on bridges and elevated roads, as well as cause outages in power and communication services.
The most severe thunderstorms and rainfall are expected on Sunday, with gusts of 20 to 45 mph possible in desert areas.
Meteorologists note that the peculiar behavior of Rachel is linked to an emerging El Niño pattern and unusually warm ocean temperatures off the coast. A climate scientist from UC Agriculture and Natural Resources highlighted the rare coincidence of a low-pressure trough and record-breaking ocean temperatures contributing to this unusual storm.
Authorities are advising residents to prepare for rapidly changing conditions, check their emergency supplies, and closely monitor updates from weather services and local news outlets. Those in flood-prone areas should be ready to evacuate if necessary and should avoid driving through flooded roads, as even shallow water can conceal dangerous risks.
