As California braces for the imminent arrival of two powerful atmospheric river storms, commonly referred to as a “Pineapple Express,” residents across the state are preparing for significant rainfall and potential flooding. Here’s what we know about these upcoming weather patterns:
What is a Pineapple Express?
The National Oceanic and Atmospheric Administration defines atmospheric rivers as narrow regions in the atmosphere that transport moisture from the tropics to northern latitudes. When these moisture-laden bands originate near Hawaii in the tropical Pacific Ocean and target the West Coast of the U.S., they are known as a Pineapple Express.
Timing of the Two Storms
These impending storms are poised to impact all major population centers in California. The first storm is expected to hit Northern California on Wednesday, bringing 2 to 4 inches of rain and winds exceeding 30 miles per hour. While this storm will primarily deliver warm air, leading to limited snowfall in higher elevations, it still poses a risk of urban and small stream flooding, particularly in Northern California.
The second storm, forecasted to arrive on Sunday, will bring colder air and the potential for significant snowfall, particularly in the Sierra Nevada region. In Southern California, this storm is expected to unleash heavy rainfall and strong winds, with gusts reaching up to 70 miles per hour in the northern part of the state.
Potential for Flooding
Both storms carry the risk of flooding, with the first storm threatening urban and small stream areas, where rapid precipitation accumulation could overwhelm drainage systems. However, the second storm presents a more significant concern, particularly for Southern California. The region, already saturated from the initial system, could experience record-breaking rainfall totals, with some areas potentially receiving up to 7 inches of rain.
As residents prepare for these impactful weather events, authorities are urging caution and preparedness, especially in flood-prone areas. With the potential for widespread flooding and hazardous conditions, residents are advised to stay informed, heed evacuation orders if issued, and take necessary precautions to ensure their safety and well-being during these storms.
