Hydrometeorological Discussion
Issued by NWS California-Nevada RFC

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AGUS76 KRSA 291810
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ZCZC RNOWRKHMD 291805
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HYDROMETEOROLOGICAL DISCUSSION
NATIONAL WEATHER SERVICE / CALIFORNIA NEVADA RFC / SACRAMENTO CA
930 AM PDT SUN MAR 29 2015

...SERIES OF WEAK SYSTEMS TO AFFECT THE NORTH MONDAY NIGHT THROUGH
EARLY THURSDAY...

.24 HOUR PRECIPITATION TOTALS (ENDING MAR 29 AT 500 AM PDT)...

NO PRECIP FELL OVER THE LAST 24-HRS WITH THE REGION UNDER A DRY
NORTHERLY FLOW PATTERN.


.METEOROLOGICAL CONDITIONS (SUN AM - SAT AM)...

SATELLITE SHOWS A GENERALLY ZONAL FLOW PATTERN OVER THE REGION THIS
MORNING...WITH A WEAK S/WV PUSHING THROUGH CENTRAL CA AND INTO
NEVADA BY THE AFTERNOON. THERE`S STILL A CHANCE FOR SOME WEAK
SHOWERS TO DEVELOP OVER THE NORTHERN AND CENTRAL SIERRA THIS
AFTERNOON AS THE S/WV PASSES THROUGH...BUT AT THIS TIME IT`S LOOKING
LIKE IT`LL JUST BE SOME CU THAT DEVELOP AND NO PRECIP.

THE NEXT UPPER TROUGH IS EXPECTED TO MOVE INTO THE PACIFIC NORTHWEST
LATE MONDAY NIGHT. WHILE THE MAJORITY OF THE ENERGY SHOULD REMAIN
OVER WASHINGTON AND NORTHERN OREGON...THE SOUTHERN EDGE OF THE
SYSTEM SHOULD STILL MANAGE TO CLIP THE NORTH COAST BY TUESDAY
MORNING. LIGHT TO LOCALLY MODERATE IS EXPECTED MAINLY FROM EARLY
TUES AM THROUGH THE LATE MORNING HOURS BEFORE PUSHING INLAND AND
WEAKENING. PRECIP SHOULD STICK TO THE SMITH AND UPPER KLAMATH
BASINS...BUT SOME LIGHT SHOWERS ARE POSSIBLE AS FAR SOUTH AS THE EEL
AND INLAND TOWARDS THE SHASTA DRAINAGE.

A SECOND...WEAKER TROUGH MOVES THROUGH QUICKLY ON THE HEELS OF THIS
FIRST. THE EC HAD PREVIOUSLY BEEN TRYING TO PRODUCE MORE SHOWERS
OVER THE NORTHERN SIERRA WITH THIS SYSTEM ON WEDNESDAY AFTERNOON...
BUT THE LATEST 00Z RUN HAS BACKED OFF OF THAT SOLUTION AND HEDGED
MORE TOWARDS THE CONSISTENTLY FURTHER NORTH GFS PATTERN. NUDGED THE
FORECAST IN THAT DIRECTION WITH HIGHER CONFIDENCE THAN BEFORE. THE
TROUGH SHOULD MOVE THROUGH LATE WED NIGHT AND PRODUCE SOME GUSTY N
TO NE WINDS OVERNIGHT...SWEEP SOME PRECIP THROUGH NV EARLY THURS...
THEN LEAVE THE REGION DRY IN ITS WAKE ON FRIDAY.


.HYDROLOGICAL CONDITIONS...

WARMER THAN NORMAL TEMPERATURES OVER THE NEXT FEW DAYS IS EXPECTED
TO INCREASE SNOWMELT RUNOFF IN SIERRA NEVADA BASINS WITH SNOW. RISES
IN STAGE IN THESE RIVER BASINS ARE FORECAST TO BE ONLY MINOR.

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



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

JM/SS

$$



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