Hydrometeorological Discussion
Issued by NWS California-Nevada RFC

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HYDROMETEOROLOGICAL DISCUSSION
NATIONAL WEATHER SERVICE / CALIFORNIA NEVADA RFC / SACRAMENTO CA
930 AM PST THU DEC 25 2014

...SCATTERED PRECIP DECREASING TODAY...
...COOLER WITH A COUPLE SYSTEMS MOVING IN FROM THE NORTH NEXT WEEK...

.24 HOUR PRECIPITATION TOTALS (ENDING DEC 25 AT 400 AM PST)...

LATEST COLD FRONT TO MOVE ACROSS THE REGION YESTERDAY BROUGHT PRECIP
TO THE NORTHERN 2/3 OF CA AND THE NORTHERN 1/2 OF NEV. GREATEST
TOTALS WERE ALONG THE COAST FROM CAPE MENDOCINO NORTHWARD WITH 0.50-
TO 1.50-INCHES. AMOUNTS DROPPED OFF CONSIDERABLY ALONG THE COAST
SOUTH OF CAPE MENDOCINO WITH TOTALS 0.10- TO 0.25-INCH (GREATEST
NORTHERN MENDOCINO COUNTY).

FOR THE UPPER KLAMATH DOWN INTO THE SHASTA DRAINAGE AMOUNTS WERE
FROM 0.25- TO 0.50-INCH WITH A FEW LOCATIONS REACHING CLOSER TO THE
0.75-INCH MARK. THEN SOUTH ALONG THE SIERRA THE TOTALS GENERALLY
RANGED FROM 0.25- TO 0.75-INCH (LOCAL 1.00-INCH) FOR THE NORTHERN
AND CENTRAL PORTIONS OF THE RANGE...AND 0.25- TO 0.50-INCH FOR THE
SOUTHERN PORTION.

CENTRAL VALLEY LOCATIONS DID RATHER POOR WITH THIS EVENT WITH
AMOUNTS REMAINING LESS THAN 0.25-INCH. FOR INSTANCE...REDDING
RECORDING 0.13-INCH...RED BLUFF 0.01-INCH...SACRAMENTO 0.08-INCH.
LIGHT AMOUNTS WERE OBSERVED IN THE SAN JOAQUIN VALLEY TOO...WITH
0.06-INCH AT STOCKTON...0.02-INCH AT MODESTO...0.04-INCH AT
BAKERSFIELD.

FOR NORTHERN NEVADA...THE BEST AMOUNTS FELL OVER THE NW FACING
SLOPES AND IN PARTICULAR THE RUBY MOUNTAINS WHERE TOTALS WERE FROM
0.50- TO 1.00-INCH. THE REST OF NE NEV SAW 0.10- TO 0.33-
INCH...WHILE NW NEV RANGED FROM A FEW HUNDREDTHS OF AN INCH TO
ALMOST 0.25-INCH AT THE WETTEST LOCATIONS.


.METEOROLOGICAL CONDITIONS (THU AM - WED AM)...

LATEST COLD FRONT IS EXITING THE REGION TO THE EAST AND SOUTH THIS
MORNING...WHILE THE MID-LEVEL S/WV TROF IS CROSSING THE NEV/UTAH
BORDER. WITH AN UPR RIDGE SITUATED OFFSHORE ALONG 140W...FLOW ACROSS
CA AND NEV IS BECOMING NORTHERLY WITH A FEW SHOWERS CONTINUING TODAY
NEAR THE CA/ORE BORDER...NE NEV...AND THE HIGHER TERRAIN OF SAN
DIEGO COUNTY.

THE UPR TROF JUST TO THE EAST WILL BE SLOW TO MOVE OUT OF THE
INTERMOUNTAIN WEST AS A DRY REINFORCING S/WV TROF DROPS SOUTH ACROSS
EASTERN NEV TOMORROW. FRIDAY INTO SATURDAY WILL BE DRY WITH THE UPR
RIDGE REMAINING JUST OFFSHORE AND A WEAK S/WV RIDGE TRAVERSING THE
REGION AHEAD OF THE NEXT SYSTEM DROPPING IN FROM THE NORTH.

THIS S/WV TROF WILL DIVE SOUTH ACROSS THE PACNW TOWARD THE GREAT
BASIN WITH A SLIGHT INCREASE IN AVAILABLE MOISTURE. THIS ISN/T
SAYING MUCH AS PW VALUES OVER THE FAR NORTHERN AREAS WILL START OUT
JUST OVER 0.10-INCH AND CLIMB TO BETWEEN 0.25- TO 0.33-INCH. LIGHT
PRECIP IS EXPECT FOR AREAS NEAR THE CA/ORE BORDER...AND FAR NW NEV
BEFORE MOVING ACROSS MUCH OF NE NEV ON SUNDAY.

FOR MONDAY...THE NEXT SYSTEM FROM THE NORTH WILL DROP IN TOWARD THE
REGION TO REINFORCE THE BROAD UPR TROF ACROSS THE THE WESTERN HALF
OF THE COUNTRY. THE MOST RECENT MODELS HAVE TRENDED FARTHER TO THE
WEST WITH THE SYSTEM...WHICH WOULD BRING PRECIP TO THE CREST OF THE
SIERRA AND POINTS EAST ACROSS NEV BEFORE DROPPING TOWARD SOUTHERN CA
AND BRINGING LIGHT PRECIP TO THIS AREA AS WELL ON TUESDAY. THE
25/00Z EC/GFS/GEM ARE IN FAIRLY REASONABLE AGREEMENT...WHILE THE
25/06Z GFS WAS EVEN FARTHER WEST...AND DRAGS IN MORE MOISTURE TOWARD
THE SOUTHERN SIERRA AND SOUTHERN CA. FOR NOW...THIS WAS DISCOUNTED
GIVEN THE BETTER AGREEMENT AMONGST THE 25/00Z MODELS.


.HYDROLOGICAL CONDITIONS...

SOME NORTHERN CALIFORNIA RIVERS EXPERIENCED VERY SMALL RISES DUE TO
THE LIGHT PRECIPITATION THAT FELL OVER THE LAST 24 HRS. ALL RIVERS
ARE EXPECTED TO REMAIN NEAR CURRENT CONDITIONS THROUGH THE FORECAST
PERIOD, AND STAY WELL BELOW MONITOR STAGES.


MORE INFORMATION ON THE CNRFC WEBSITE AT HTTP://WWW.CNRFC.NOAA.GOV

DRK/BW

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