767
NGUS86 KRSA 041456
HCMRSA
HYDROMETEOROLOGICAL COORDINATION MESSAGE
NATIONAL WEATHER SERVICE / CALIFORNIA NEVADA RFC / SACRAMENTO CA
700 AM PST THU DEC 4 2025
...DRY CONDITIONS FOR MOST OF THE REGION THROUGH THE PERIOD AS
STRONG HIGH PRESSURE SITS OVER THE EASTERN PACIFIC...
...LIGHT SHOWERS ALONG THE NRN BORDER FRI INTO EARLY NEXT WEEK AS A
A FEW SYSTEMS SLIDE DOWN THE RIDGE INTO THE PACNW...
METEOROLOGICAL CONDITIONS (THU AM - WED AM)
A STRONG UPPER RIDGE REMAINS OVER THE EASTERN PACIFIC AND IS
EXPECTED STAY MOSTLY PUT THROUGH THE FORECAST PERIOD. THIS WILL
RESULT IN DRY CONDITIONS FOR THE MAJORITY OF THE REGION OVER THE
NEXT SIX DAYS. MODELS CONTINUE TO SHOW A FEW SYSTEMS SLIDING OVER
TOP AND DOWN THE EAST SIDE OF THE RIDGE INTO THE PACNW STARTING
FRIDAY WITH ADDITIONAL DISTURBANCES OVER THE WEEKEND THROUGH EARLY
NEXT WEEK. THINGS STILL LOOK FAIRLY MINIMAL FOR FRIDAY IN TERMS OF
ACCUMULATIONS, JUST LIGHTER SHOWERS ALONG THE NORTHERN BORDER. OVER
THE WEEKEND, EXPECTING SHOWERS ALONG THE NORTH COAST, OVER THE SRN
OR CASCADES, AND OVER NE NV. THE MONDAY/TUESDAY PACNW EMBEDDED
SHORTWAVE LOOKS TO BRING MAYBE A LITTLE BIT MORE PRECIP TO THE NORTH
COAST AND SRN OR CASCADES BUT NOTHING SUBSTANTIAL. IT WILL DEPEND
HOW MUCH THIS SYSTEM FLATTENS THE RIDGE ALLOWING PRECIP TO TRAVEL
FURTHER SOUTHWARD. THE ECMWF ENSEMBLES ARE OVERALL WETTER THAN THE
GEFS FOR TUESDAY. THE 24 HR QPF RANGE ENDING WEDS AM AT ARCATA FOR
THE ECMWF IS 0 TO NEARLY 3" WHILE THE RANGE FOR THE GEFS IS ABOUT
HALF AN INCH. ENSEMBLE 500 MB HEIGHT CLUSTERS SHOW VARYING DEGREES
OF THE RIDGE FLATTENING NEXT WEEK AND ALL IN DIFFERENT EAST/WEST
POSITIONS IN TERMS OF THE RIDGE AXIS. EITHER WAY, DOESN'T LOOK LIKE
CA IS IN FOR ANY SIGNIFICANT SYSTEMS IN THE NEAR FUTURE. LONGER TERM
OUTLOOKS SHOW MAYBE SOMETHING DIPPING A BIT FURTHER SOUTH THAN JUST
THE NORTH COAST FOR MID-DECEMBER, BUT IT IS TOO SOON TO SAY WITH ANY
CERTAINTY.
THE MORNING QPF WAS A BLEND OF WPC GUIDANCE AND THE LATEST NBM.
AMOUNTS WENT UP OVER NE NV BY 0.10" OR SO COMPARED TO YESTERDAY AND
ABOUT 0.50" OVER THE RUBY MOUNTAINS. THINGS OVER CA ARE RELATIVELY
STABLE ONLY GOING UP OR DOWN ALONG THE BORDER BY 0.10". QPF TOTALS
THROUGH 12Z WEDS: 0.25-0.60" SMITH BASIN, 1-2.30" SRN OR CASCADES,
0.75-2" RUBY MOUNTAINS, AND A FEW HUNDREDTHS TO 0.25" FOR THE REST
OF THE NRN CA/NV BORDERS.
FREEZING LEVELS 5.5 TO 12.5 KFT THIS MORNING FROM EASTERN NV TO THE
CA COAST. HIGHER LEVELS WILL SPREAD EASTWARD INTO THE WEEKEND UP TO
8.5-13.5 KFT BY FRIDAY EVENING BEFORE LOWERING ALONG THE NORTHERN
BORDERS AS SYSTEMS PASS THROUGH THE PACNW DOWN TO ABOUT 7-9 KFT.
BACK UP TO 10-14 KFT ACROSS THE REGION 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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