Hydrometeorological Discussion
Issued by NWS California-Nevada RFC

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AGUS76 KRSA 271602
HMDRSA

HYDROMETEOROLOGICAL DISCUSSION
NATIONAL WEATHER SERVICE / CALIFORNIA NEVADA RFC / SACRAMENTO CA
800 AM PST TUE JAN 27 2015

...PRECIP MOVING FROM SOCAL TOWARD CENTRAL CA AND STATE OF NEV...

.24 HOUR PRECIPITATION TOTALS (ENDING JAN 27 AT 400 AM PST)...

LIGHT PRECIP FELL ACROSS THE SOUTHERN HALF OF CA AND SOUTHERN NV
MONDAY AFTERNOON AND TUESDAY MORNING AS A LOW PRESSURED SYSTEM MOVED
FROM NORTH TO SOUTH ACROSS THE AREA. THE SOUTHERN CA/NV DESERTS SAW
THE HEAVIEST AMOUNTS WITH SOME LOCATIONS PICKING UP AMOUNTS IN
EXCESS OF 0.5". TOTALS RANGED BETWEEN 0.25"-0.5" ALONG THE COAST
FROM SAN DIEGO TO POINT CONCEPTION. LIGHTER AMOUNTS AROUND 0.10"
WERE RECORDED FROM POINT CONCEPTION NORTHWARD TO THE SANTA LUCIA
MOUNTAINS SOUTH OF MONTEREY BAY.


.METEOROLOGICAL CONDITIONS (SHORT TERM: TUE AM - FRI AM)...

LATEST WV/IR IMAGERY SHOWS THE UPR LOW THAT DRIFTED NNE FROM JUST
WEST OF BAJA HAS OPENED UP AND IS MOVING FROM SOUTHERN CA TOWARD
CENTRAL NEV. PRIMARY CIRCULATION IS EVIDENT JUST SOUTH OF BISHOP.
THE 88-D MOSAIC SHOWS AN AREA OF LIGHT PRECIP MAINLY FROM THE
MONTEREY COUNTY COAST INLAND ACROSS THE CENTRAL SAN JOAQUIN VALLEY
AND STRETCHING OVER THE CENTRAL SIERRA TO THE I-80 CORRIDOR OF
NEVADA. ALSO...SCATTERED SHOWERS ARE MOVING INLAND OVER THE
TRANSVERSE RANGES OF SOUTHERN CA. PRECIP IS FAIRLY LIGHT WITH GAGES
SINCE 27/12Z GENERALLY SHOWING AMOUNTS NEAR OR LESS THAN 0.10-INCH.
THERE ARE A FEW LOCALIZED STATIONS JUST OVER THE 0.10-INCH MARK.

THE SYSTEM WILL CONTINUE TO TRACK ACROSS NORTHERN NEV LATER TODAY
BEFORE EXITING THE REGION TOWARD THE NORTHERN/CENTRAL ROCKIES
OVERNIGHT. THIS WILL ALLOW PRECIP TO BE ON THE DECREASE AS A
TRANSITORY UPR RIDGE BEGINS TO MOVE ACROSS THE REGION. NEXT SYSTEM
ON TAP WILL BE A WEAK ELONGATED UPR TROF ON THURSDAY THAT MAY BRING
SOME LIGHT PRECIP TO THE CREST OF THE SOUTHERN SIERRA...THE HIGHER
TERRAIN OF SOUTHERN CA...AND THE SOUTHERN HALF OF NEVADA. 27/00Z EC
IS A BIT MORE WIDESPREAD WITH THE PRECIP...WHILE THE 27/09Z SREF AND
27/06Z GFS IS MORE SCATTERED. LEANED TOWARD THE LESS COVERAGE ON
THURSDAY.


.METEOROLOGICAL CONDITIONS (LONG TERM: FRI AM - MON AM)...

AN UPPER LEVEL LOW WILL REMAIN CENTERED OVER THE CA/NV/AZ BORDER
FRIDAY BEFORE SLOWLY MOVING SOUTH OUT OF THE AREA LATE SATURDAY
TAKING THE CHANCE OF PRECIP WITH IT. LIGHT PRECIP IS POSSIBLE ON THE
BACKSIDE OF THIS SYSTEM ACROSS SOUTHERN NV, THE SOUTHERN SIERRA AND
EASTERN PORTIONS OF THE TRAVERSE MOUNTAINS THROUGH SATURDAY.

A RIDGE BUILDS ACROSS MOST OF THE AREA ON SUNDAY AS THE NEXT WEATHER
SYSTEM APPROACHES THE NORTH COAST. MODELS HAVE THE RIDGE FLATTENING
AS A SERIES OF S/WV SLIDE ACROSS THE RIDGE EARLY NEXT WEEK BRINGING
PRECIP TO THE NORTH COAST.


.HYDROLOGICAL CONDITIONS...

PRECIP OVER THE NEXT WEEK WILL HAVE MINIMAL IMPACTS ON AREA RIVERS.
NO CRITICAL STAGES EXPECTED.


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

MI/DRK/MI/BW

$$



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