Powerful storms are sweeping across California and the Northwest, bringing with them the threat of flooding and landslides. These storms are the result of an atmospheric river, a phenomenon that occurs when a system pulls in a significant amount of moisture from the atmosphere. The first storm is already making its presence known, with rainfall spreading into the Pacific Northwest and California.
The highlight of this storm is the atmospheric river moisture pipeline, which stretches all the way to Hawaii. This is what meteorologists refer to as the “pineapple express,” as it brings moisture from the tropical region to the West Coast. The nickname is derived from the fact that pineapples are associated with Hawaii. This moisture pipeline is responsible for the heavy rainfall expected in California and the Northwest.
As a result of these storms, flood watches are in effect for parts of Northern and Southern California, including the Bay Area, Sacramento, and San Diego. The runoff from the heavy rainfall could lead to flooding in rivers, creeks, and streams, as well as low-lying areas. Winter storm alerts have also been issued for the Sierra Nevada and the mountains of Southern California, where heavy snowfall could impact travel in higher elevations.
In addition to the flood and winter storm alerts, wind advisories and high wind warnings have been posted in parts of California and southern Oregon. Strong gusts of wind could potentially cause scattered power outages and tree damage.
Looking ahead, there are two more rounds of stormy weather expected. The first storm will continue to spread heavier rain and mountain snow towards Southern California, while parts of Northern California and the Northwest will also experience wet conditions. There is a possibility of localized flooding, landslides, and rockslides in Southern California, especially in areas that were already soaked by previous storms. Some of the moisture from this system will also move across inland areas of the Southwest.
The second storm, which is set to arrive by Sunday, is expected to be wetter and potentially more impactful. Details are still uncertain, but it has the potential to bring flooding rain, landslides, rockslides, mountain snow, and strong winds. The impact of this storm could be exacerbated by the fact that the ground is already saturated from the previous storm.
In terms of precipitation, Northern California is expected to receive the highest rainfall totals, with some areas receiving over 3 inches this week. Southern California can expect 1 to 3 inches of rainfall in most areas, with higher amounts in foothills and mountains. Snow levels in the Sierra will start high, around 6,000 to 7,000 feet, before dropping to 2,500 to 3,500 feet by Friday.
As for the second storm, it is too early to determine exact amounts, but meteorologists anticipate multi-inch rainfall totals in parts of California from Sunday through at least Tuesday. The Sierra Nevada will see significant snowfall, measured in feet.
It is important to stay updated on the weather conditions and heed any warnings or advisories issued by the National Weather Service. These storms have the potential to cause significant disruption and pose risks to public safety. Stay safe and be prepared for the possibility of flooding, landslides, and other weather-related hazards.
