The fifth storm system of winter 2025/26 is forecast to impact the San Jacinto mountains between Tuesday 23rd and Friday 26th December 2025.
Please check this page for periodic updates – the most recent is at the top – throughout the multiday storm sequence. The next comprehensive Report update, summarizing conditions after the storm, is tentatively scheduled for Saturday 27th.
UPDATE Wednesday 24th December 2025 at 0620
At least in the San Jacinto mountains the initial front of the atmospheric river system is so mild (relatively speaking) that it is currently raining all the way to San Jacinto Peak.
Patchy, and at times intense, rain started in Idyllwild at 0200, with rain accumulation overnight 0.20 inch in Idyllwild (at 5550 ft), with the same amount reported in Long Valley (8500 ft).
UPDATE Tuesday 23rd December 2025 at 1700
One “arm” of the dramatic low pressure system forming off the California coast passed over the San Jacinto mountains around 1130 this morning, bringing light precipitation throughout. The temperature plunged more than 10°F in less than half-an-hour in the high country, and it briefly snowed above 8000 ft (with barely a dusting in Long Valley), and about 0.02 inch of drizzle in Idyllwild. The temperature rose again subsequently, melting the minimal fresh snow. It remained misty and drizzly throughout the early afternoon, totaling 0.15 inch in Idyllwild, before beautifully clearing out at dusk.
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