Water Resources of the United States

PROJECT ALERT NOTICE (CA) Northern California Storms and High Water

Date: Sat, 01 Dec 2012 10:40:23 EST

Summary: First wave of heavy rainfall brought 4-10 inches of rain, producing moderate peaks in the Coast Range, Shasta R. Basin and Northern Sierra Nevada Mtns.

The first wave of heavy rain, produced significant runoff, as snow levels were very high - 7-8,000 ft. - Not a rain on snow event as reported on national radio news. A few rivers rose to above monitoring stage, with minor flooding experienced on the coast on the Navarro and Eel Rivers. Peak discharges ranged from a 10 to 25 yr. R.I. level. On Friday, Nov. 30, 10 crews total from the CA WSC Field Offices in Eureka, Redding, Ukiah, Santa Cruz and Sacramento, were in the field collecting high water measurements at 18 sites. Precipitation is forecast to be light today, so only 3 crews will be out doing follow up measurements, and tree trimming in preparation for the next wave of heavy rain Saturday night.

CNRFC forecast for the next wave of heavy rain to hit between 10PM tonight and 10AM tomorrow, Sun. 12/2 - QPF calls for 4-6 in. in lower elevations, and up to 8 in. in the higher mountains. Current models have the storm track out of the west centered on Mendocino County.

10 crews will again be in the field on Sunday 12/2, concentrating on numerous rivers that are forecast to be above monitor or flood stage. Flood stage is forecast to be exceeded on the Eel, Navarro, Russian and Napa Rivers in the Coast range. Monitoring stage to be exceeded on the main stem of the Sacramento River from Bend Bridge gage down to Ord Ferry. Northern Sierra will get flood stage exceedence on the Susan River nr Susanville, MF Feather River. Truckee River at Farad will be above monitor stage, and above flood stage in the lower reaches at the NV gages. Santa Cruz mountains, so. of the Bay area will also get significant peaks. Santa Cruz FO will also be in the field on Sun. 12/2.

Sub-Region: Pacific West; Region: Western United States

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