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After a dangerously dry start, atmospheric rivers deliver a water lifeline to the American West, offering fresh data on the erratic weather patterns reshaping agriculture worldwide.

A relentless parade of December storms has finally breathed life into California’s parched mountains, offering a fragile reprieve to one of the world’s most critical agricultural engines.
While thousands of kilometers from Nairobi, the health of the Sierra Nevada snowpack—now standing at 71% of its historical average—serves as a vital barometer for global climate volatility. As a massive exporter of food and a case study in water management, California's hydrological health influences international market dynamics and offers lessons for drought-prone nations facing similar erratic weather cycles.
State scientists, conducting their first manual survey of the season at the Phillips Station in the Sierra Nevada, recorded a snow depth of 24 inches (61cm). This measurement is not merely meteorological trivia; it represents the state's water bank.
Angelique Fabbiani-Leon, a hydrometeorologist with the California Department of Water Resources, noted that this snowpack acts as a massive "frozen reservoir." In a system that mirrors the function of Kenya's own water towers—like the Aberdares or Mount Kenya—this snow provides approximately one-third of the water used annually in California. As it melts in spring, it feeds rivers, sustains cities, and replenishes the groundwater essential for farming.
The recovery follows a worrying period of warm, dry weather that threatened to derail the water year before it began. However, a powerful "atmospheric river"—a long, narrow region in the atmosphere that transports most of the water vapor outside of the tropics—slammed into the coast, dumping record rain in Los Angeles and heavy snow in the high altitudes.
Despite the recent deluge, experts warn against premature celebration. The current level of 71% of the average indicates that while the bleeding has stopped, the patient is not yet out of danger.
"While California is in a better position now, it is still early in the season," Fabbiani-Leon cautioned, emphasizing that the consistency of future rainfall remains the primary variable.
For observers in East Africa, the situation underscores a shared reality: the era of predictable seasonal rains is fading. Whether in the Sierra Nevada or the Rift Valley, water security now hinges on adapting to a climate of extremes—swinging violently from drought to deluge.
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