052
NGUS86 KRSA 312023
HCMRSA
HYDROMETEOROLOGICAL COORDINATION MESSAGE
NATIONAL WEATHER SERVICE / CALIFORNIA NEVADA RFC / SACRAMENTO CA
130 PM PDT MON MAR 31 2025
...SCATTERED PRECIP ACROSS CA/NV TODAY AND TUES ALONG WITH AREAS OF
T-STORMS AS A LARGE UPPER LOW MOVES THROUGH...
...LINGERING LIGHT SCATTERED SHOWERS WEDS INTO THE WEEKEND AS THE
SAME SYSTEM GRADUALLY MOVES ACROSS THE REGION, T-STORMS POSSIBLE
OVER NV AND SE CA WEDS...
METEOROLOGICAL CONDITIONS (SHORT TERM: MON PM - THU AM)
A COLD FRONT CONTINUES TO TRAVERSE THE REGION NOW THROUGH WESTERN NV
ACROSS THE CENTRAL SIERRA AND OUT TO SEA NEAR POINT CONCEPTION. THE
SURFACE/UPPER LOW REMAINS OFFSHORE OF THE PACNW WHILE A MOISTURE
PLUME HEADS THROUGH SOCAL INTO BAJA. OBSERVATIONS OVER THE PAST 6
HOURS REPORT ANOTHER 0.30-1" ACROSS THE SIERRA AND SCATTERED AMOUNTS
OF 0.10-0.50" OVER THE REST OF CA. CURRENT RADAR IMAGERY SHOWING
SCATTERED SHOWERS AND THUNDERSTORMS ACROSS NRN/CNTRL CA/NV WITH SOME
LINGERING LIGHT RETURNS NEAR SAN DIEGO. THE APPROACHING OFFSHORE LOW
WILL PRODUCE ADDITIONAL SHOWERS AND THUNDERSTORMS THE REST OF TODAY
AS IT INCHES CLOSER TO THE COAST. SHOWER AND THUNDERSTORM ACTIVITY
EXPECTED TOMORROW AS WELL AS THE LOW OPENS INTO A TROUGH AND BEGINS
TO HEAD SOUTHEASTWARD INTO CA. THE TROUGH AXIS WILL REACH SE CA
WEDNESDAY MORNING ALLOWING DRIER AIR TO MOVE IN FROM THE NORTH DOWN
THE BACK SIDE OF THE SYSTEM. THIS WILL RESULT IN DECREASED PRECIP
PRODUCTION WITH SHOWERS BECOMING LIGHTER AND MORE SCATTERED.
THUNDERSTORMS POSSIBLE AGAIN WEDS OVER NV AND SE CA.
FORECAST WENT DOWN OVER PARTS OF NW CA BY 0.10-0.75" AND UP OVER THE
CENTRAL/SOUTHERN SIERRA BY 0.10-0.50" AS MODELS ATTEMPT TO DIAL IN
ON THE CONVECTIVE ACTIVITY. FORECAST WAS A COMBINATION OF WPC
GUIDANCE AND THE 19Z NBM. QPF 18Z MON-12Z THURS: 1.25-3" NRN CA
COAST NORTH OF SONOMA COUNTY, 1.50-4" SIERRA, 0.75-1.50" SHASTA,
0.50-1" SRN OR CASCADES, 0.25-0.75" BAY AREA/CENTRAL COAST (UP TO 1"
BIG SUR MOUNTAINS) , 0.10-0.75" VALLEYS (1-1.50" FOOTHILLS), FEW
HUNDREDTHS TO 0.10" COASTAL SRN CA, AND 0.25-0.50" SAN BERNADINO/SAN
JACINTO/LAGUNA MOUNTAINS.
FREEZING LEVELS 3-5 KFT NORTH OF I-80 AND 4.5-8 KFT FROM I-80 TO THE
SOUTHERN SIERRA THIS AFTERNOON LOWERING THE REST OF THE DAY TO 3-5.5
KFT NORTH OF POINT CONCEPTION BY EARLY TUESDAY. MUCH OF THE REGION
TO REMAIN AT 3.5-6.5 KFT FOR THE REST OF THE NEAR TERM.
METEOROLOGICAL CONDITIONS (LONG TERM: THU AM - SUN AM)
MINIMAL CHANGES TO THE AFTERNOON FORECAST INCORPORATING THE 31/12Z
MODELS AND THE LATEST WPC QPF ALONG WITH 31/19Z NBM. A NARROW
WAVELENGTH UPR RIDGE WILL MAKE ITS WAY FROM THE EASTERN PACIFIC
TOWARD THE WEST COAST...WHILE A BROAD UPR TROF CARVED ACROSS THE
WESTERN US WILL SLOWLY MAKE ITS WAY DOWNSTREAM OF THE AREA.
SCATTERED LIGHT SHOWERS ARE STILL POSSIBLE FOR AREAS NEAR THE CREST
OF THE SIERRA...COASTAL SOUTHERN CA..AND PORTIONS OF EASTERN NV.
AMOUNTS WILL LIKELY REMAIN NEAR AND LESS THAN 0.10-INCH FOR THE
THURSDAY THROUGH SATURDAY PERIOD. FREEZING LEVELS WILL START
REASONABLY LOW FROM 3000- TO 6000-FEET AND THEN MODERATE A
BIT...ESPECIALLY WEST AS THE UPR RIDGE BUILDS CLOSER.
QPF GRAPHICS ARE AVAILABLE AT WWW.CNRFC.NOAA.GOV/QPF.PHP
*********************** CONTACT INFORMATION ************************
CNRFC OFFICE HOURS PHONE: 1 (916) 979-3056 EXTENSION 338
AFTER-HOURS CALLING SERVICE: 1 (800) 218-0858
LEAVE NAME...OFFICE...AND PHONE NUMBER
AS/KOZLOWSKI
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