A stream of moisture from low latitudes continues from the nearly stationary, large disturbance west of Hawaii. The target for the coming days seems to be California, with very large amounts of precipitation and flooding likely during the last two weeks of the year.---------------------------------------------------------------------
The top image is this morning's (Saturday 18 December 2010) water vapor satellite image for the eastern Pacific (top); this morning's precipitable water composite (from CIMSS at Univ. of Wisc.) for the eastern Pacific; and the NAM 60 hour forecast (from last evening's run) precipiptation amounts for the period ending 12 UTC on Monday morning. While amounts in the Sierra Nevada are very large, a significant mountain precipitation event is also indicated in the forecast for the moutains of northern and northwestern Arizona.
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From NWS Sacramento yesterday afternoon:
HYDROLOGIC OUTLOOK
NATIONAL WEATHER SERVICE SACRAMENTO CA
228 PM PST FRI DEC 17 2010
...EXTENDED PERIOD OF VERY WET CONDITIONS CONTINUING THROUGH
NEXT WEEK...
...URBAN AND SMALL STREAM FLOODING REMAINS THREAT...
MULTIPLE PACIFIC STORMS WILL IMPACT THE REGION THROUGH THE MIDDLE
OF NEXT WEEK. THESE STORMS WILL BRING PERIODS OF HEAVY RAINFALL
ACROSS THE CENTRAL VALLEY AND SIERRA FOOTHILLS...AND VERY HEAVY
SNOWFALL TO THE MOUNTAINS.
FROM NOW THROUGH WEDNESDAY...RAINFALL AMOUNTS ARE EXPECTED TO REACH 2 TO 4 INCHES IN THE CENTRAL VALLEY AND 3 TO 6 INCHES IN THE
SIERRA FOOTHILLS AND UPPER SACRAMENTO RIVER DRAINAGE. AT THE
HIGHER ELEVATIONS...NEW SNOWFALL ACCUMULATIONS OF SEVERAL FEET ARE
POSSIBLE OVER THE SHASTA COUNTY MOUNTAINS WITH AS MUCH AS 10 FEET
POSSIBLE OVER THE CENTRAL SIERRA. SNOW LEVELS WILL VARY BETWEEN 3000
NATIONAL WEATHER SERVICE SACRAMENTO CA
228 PM PST FRI DEC 17 2010
...EXTENDED PERIOD OF VERY WET CONDITIONS CONTINUING THROUGH
NEXT WEEK...
...URBAN AND SMALL STREAM FLOODING REMAINS THREAT...
MULTIPLE PACIFIC STORMS WILL IMPACT THE REGION THROUGH THE MIDDLE
OF NEXT WEEK. THESE STORMS WILL BRING PERIODS OF HEAVY RAINFALL
ACROSS THE CENTRAL VALLEY AND SIERRA FOOTHILLS...AND VERY HEAVY
SNOWFALL TO THE MOUNTAINS.
FROM NOW THROUGH WEDNESDAY...RAINFALL AMOUNTS ARE EXPECTED TO REACH 2 TO 4 INCHES IN THE CENTRAL VALLEY AND 3 TO 6 INCHES IN THE
SIERRA FOOTHILLS AND UPPER SACRAMENTO RIVER DRAINAGE. AT THE
HIGHER ELEVATIONS...NEW SNOWFALL ACCUMULATIONS OF SEVERAL FEET ARE
POSSIBLE OVER THE SHASTA COUNTY MOUNTAINS WITH AS MUCH AS 10 FEET
POSSIBLE OVER THE CENTRAL SIERRA. SNOW LEVELS WILL VARY BETWEEN 3000
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