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NGUS86 KRSA 061542
HCMRSA
HYDROMETEOROLOGICAL COORDINATION MESSAGE
NATIONAL WEATHER SERVICE / CALIFORNIA NEVADA RFC / SACRAMENTO CA
830 AM PST FRI FEB 6 2026
...MULTIPLE WEAK SYSTEMS WILL MOVE ONSHORE OVER THE COMING HOURS
TO DAYS BRINGING LIGHT PRECIPITATION TO THE FORECAST AREA...
METEOROLOGICAL CONDITIONS (FRI AM - THU AM)
A WEAK UPPER LOW OFF THE BAJA PENINSULA HAS BEGUN PHASING WITH A
SHORTWAVE THAT IS CRASHING SOUTHEASTWARD OVER NEVADA, SPREADING
LIGHT AND SCATTERED SHOWERS OVER THE SOUTHERN HIGH SIERRA, OWENS
VALLEY, AND SOUTHERN NEVADA. THE UPPER LOW WILL CONTINUE TO TRACK
OVER THE BAJA PENINSULA, SPREADING WEAK SHOWER ACTIVITY NORTHWARD
ALONG THE SIERRA TO THE TAHOE BASIN. PRECIPITATION ACCUMULATIONS
WILL REMAIN QUITE LIGHT, RESULTING IN MOSTLY TRACE ACCUMULATIONS AT
THE HIGHEST ELEVATIONS AND UP TO A FEW TENTHS OF AN INCH OVER THE
SOUTHERN HIGH SIERRA.
OVER THE WEEKEND, THE PERSISTENT AND POSITIVELY TILTED RIDGE WILL
FLATTEN OUT ENOUGH TO ALLOW A WEAK SYSTEM TO SPREAD ENHANCED ONSHORE
MOISTURE TRANSPORT (IVT ~500 UNITS) ACROSS FAR NORTHERN CALIFORNIA
AND SOUTHERN CASCADES ON SUNDAY. ATMOSPHERIC RIVER CONDITIONS WILL
PRIMARILY REMAIN OVER NORTHERN CA, DISSIPATING SOMEWHERE AROUND THE
I-80 CORRIDOR. THE HEAVIEST PRECIPITATION ACCUMULATIONS OF >1 INCH
ARE CURRENTLY TARGETING THE SMITH BASIN, EXTENDING AS FAR SOUTH AS
NORTHERN HUMBOLDT COUNTY.
THERE IS THE POTENTIAL FOR ANOTHER WEAK SYSTEM TO MOVE ONSHORE OVER
THE CENTRAL CA COAST EARLY ON TUESDAY, THOUGH UNCERTAINTY REMAINS
HIGH ACROSS ALL GUIDANCE PERTAINING TO ACCUMULATIONS AND TIMING.
THIS MORNING'S NBM RUN RAMPED ACCUMULATIONS UP A BIT COMPARED TO
PREVIOUS RUNS. CURRENT QPF KEEPS THE HEAVIEST ACCUMULATIONS OF ~1
INCH OVER A MAJORITY OF THE SIERRA, BUT ACCUMULATIONS ARE LIKELY TO
BE ADJUSTED AS GUIDANCE UPDATES.
FREEZING LEVELS WILL LOWER FROM ~9K FEET TO ~5K WITH THE SYSTEM
MOVING ONSHORE OVER THE SMITH BASIN. LEVELS OVER THE SOUTHERN SIERRA
ARE FORECAST TO LOWER TO ~5.5-6K FEET AS THE SYSTEM MOVES ON SHORE
EARLY NEXT WEEK.
PLEASE NOTE: THIS PRODUCT MAY NOT BE ROUTINELY UPDATED.
PLEASE REFER TO THE FOLLOWING PRODUCT ISSUED BY THE CNRFC
WWW.CNRFC.NOAA.GOV/DAILY-BRIEFING FOR A GRAPHICAL SUMMARY OF
WEATHER AND HYDROLOGIC CONDITIONS.
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
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