Hydrometeorological Discussion
Issued by NWS California-Nevada RFC

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AGUS76 KRSA 151728
HMDRSA

- KRNO 151441
WRKHMD

HYDROMETEOROLOGICAL DISCUSSION
NATIONAL WEATHER SERVICE / CALIFORNIA NEVADA RFC / SACRAMENTO CA
930 AM PDT WED APR 15 2015

****************************** NOTICE ******************************
THIS IS THE LAST SCHEDULED ISSUANCE OF THE RNOHMDRSA PRODUCT FOR THE
2014-2015 WINTER SEASON.  THIS PRODUCT WILL NEXT BE ISSUED ON THU
OCT 15 2015 UNLESS CONDITIONS WARRANT AN EARLIER ISSUANCE.
********************************************************************

...DRY NEXT SEVERAL DAYS EXCEPT A FEW SHOWERS POSSIBLE THIS WEEKEND
INTO MON...

.24 HOUR PRECIPITATION TOTALS (ENDING APR 15 AT 500 AM PDT)...

A S/WV TROUGH MOVED ACROSS NORTHERN CA/NV YESTERDAY WHICH BROUGHT
SOME LIGHT PRECIP TO THE AREA. PRECIP TOTALS WERE HEAVIEST ACROSS
THE SMITH BASIN, MOST OF WHICH FELL IN THE MOUNTAINOUS REGIONS.
PRECIP QUICKLY DROPPED OFF FURTHER SOUTH WITH ONLY A FEW TENTHS
ACROSS THE EEL BASIN. SCATTERED AMOUNTS NEAR ONE TENTH TO A QUARTER
INCH FELL ACROSS THE SHASTA DRAINAGE AND THE NORTHERN SIERRA.
NORTHERN NV SAW SOME LIGHT TO MODERATE SNOW SHOWERS YESTERDAY, WITH
SOME OF THE HIGHER TERRAIN PICKING UP LIQUID PRECIP TOTALS NEAR ONE
HALF INCH.


.METEOROLOGICAL CONDITIONS (SHORT TERM: WED AM - SAT AM)...

THE REGION IS UNDER GENERALLY NW TO N FLOW ALOFT IN THE WAKE OF AN
UPPER TROUGH NOW PUSHING ACROSS THE GREAT BASIN AS A CLOSED LOW.
ALTHOUGH A FEW LIGHT SHOWERS WILL BE POSSIBLE IN THE HIGHER TERRAIN
OF NE NV THIS MORNING, NOT LOOKING FOR MUCH ACCUMULATION.  LOOK FOR
DRY CONDITIONS THROUGH THE SHORT-RANGE FORECAST PERIOD AS THE REGION
REMAINS IN AN AMPLIFIED PATTERN BETWEEN RIDGING OFFSHORE AND THE
UPPER LOW OVER THE ROCKIES AS THE LOW BECOMES NEARLY STATIONARY.


.METEOROLOGICAL CONDITIONS (LONG TERM: SAT AM - TUE AM)...

THE PERIOD BEGINS WITH A UPPER LEVEL LOW CENTERED NEAR THE CO/NM
BORDER WITH A S/WV MOVING SOUTHWARD NEAR THE CA/OR BORDER. THIS S/WV
WILL CREATE ENOUGH INSTABILITY... ALONG WITH DAYTIME HEATING... TO
KEEP A CHANGE OF PRECIP IN THE FORECAST THROUGHOUT THE PERIOD FOR
PARTS OF THE SIERRA AND INTERIOR NORTHERN CA.

SATURDAY LOOKS MOSTLY QUITE ACROSS THE AREA. THERE IS A SLIGHT
CHANCE OF A FEW ISOLATED SHOWERS ACROSS THE CENTRAL SIERRA AND
INTERIOR NORTHERN CA. THE GFS/GEM HAVE THE S/WV DROPPING SOUTH AND
FORMING A CLOSED LOW BY SUNDAY ALONG THE CENTRAL CA COAST... WHICH
WOULD INCREASE CHANCES AND COVERAGE OF PRECIP ACROSS THE SIERRA. THE
EC DEPICTS A WEAKER SYSTEM AND KEEPS THE LOW WELL OFFSHORE, WHICH
WOULD HAVE LESS IMPACT ON THE AREA. THE CURRENT FORECAST FOR
SUNDAY/MONDAY LEANS TOWARD THE GFS/GEM SOLUTION. HAVE KEPT PRECIP
TOTALS LIGHT AND CONFINED TO THE HIGHER TERRAIN ALONG THE SIERRA AT
THIS TIME... WITH SCATTERED SHOWERS ACROSS PARTS OF INTERIOR
NORTHERN CA.


.HYDROLOGICAL CONDITIONS...

ALL RIVERS AND STREAMS IN THE CNRFC FORECAST AREA ARE CURRENTLY
BELOW... AND ARE FORECAST TO REMAIN BELOW MONITOR LEVELS THROUGH
SUNDAY.

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

MI/KL/MI/SS

$$



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