038
NGUS86 KRSA 041537
HCMRSA
HYDROMETEOROLOGICAL COORDINATION MESSAGE
NATIONAL WEATHER SERVICE / CALIFORNIA NEVADA RFC / SACRAMENTO CA
840 AM PDT THU JUN 4 2026
..WARM AND DRY THROUGH FRIDAY
..TURNING COOLER THIS WEEKEND INTO EARLY NEXT WEEK
..PRECIP CHANCES INCREASE FOR NORTHERN CA AND NORTHERN NV MON-TUE
METEOROLOGICAL CONDITIONS (THU AM - WED AM)
THE S/WV TROF THAT MOVED ACROSS THE PACIFIC NORTHWEST YESTERDAY HAS
SHIFTED OFF TOWARD THE EAST AND IS NOW MAKING ITS WAY ACROSS THE
NORTHERN ROCKIES THIS MORNING. THE DEEP UPR LOW OVER THE NORTHEAST
PACIFIC HAS SHIFTED A BIT TO THE EAST AS WELL AND NOW CURRENTLY
RESIDES IN THE VICINITY OF 52N/138W. AT THE SAME TIME...THE UPR
RIDGE TO THE SOUTHWEST OF THE CA COAST IS BUILDING ACROSS THE REGION
AND WILL BRING DRY AND ABOVE AVERAGE TEMPERATURES FOR THE NEXT
COUPLE DAYS...PEAKING ON FRIDAY. ANOMALIES ARE CURRENTLY EXPECTED TO
BE ANYWHERE FROM PLUS 5- TO PLUS 20-DEGF OVER SEASONAL NORMALS FOR
AFTERNOON HIGH TEMPERATURES.
BY THIS WEEKEND...THE SYSTEM OVER THE NORTHEAST PACIFIC WILL SLOWLY
MAKE ITS WAY EASTWARD AND BECOME A BIT MORE ELONGATED...BRINGING
TROFFING TO THE WEST COAST. THIS WILL RESULT IN TEMPERATURES COOLING
AND INITIALLY SOME SCATTERED LIGHT PRECIP FROM THE SOUTHERN SIERRA
UP TOWARD NORTHEAST NV ON SATURDAY AND SUNDAY.
AS THIS SYSTEM ROTATES INLAND LATER SUNDAY...THE NEXT DISTURBANCE
MAKING ITS WAY ACROSS THE PACIFIC WILL REPLACE THIS FIRST ONE.
ALSO...THIS FEATURE WILL HAVE A TAP INTO SOME LOWER LATITUDE
MOISTURE THAT IS ADVECTING NORTHEAST OVER THE CENTRAL PACIFIC INTO
THE MID-LATITUDES AND THEN RIDING EAST GENERALLY JUST NORTH OF 40N.
THIS MOISTURE PLUME ACTUALLY HAS SOME IMPRESSIVE PW VALUES THAT ARE
OVER 2.00-INCHES INITIALLY...AND AROUND THE 1.00-INCH MARK AS IT
INTERSECTS THE WEST COAST EARLY ON MONDAY FROM THE SF BAY AREA UP TO
ABOUT CAPE MENDOCINO. MODELS ARE CONTINUING TO HINT AT AN INCREASING
CHANCE OF WIDESPREAD LIGHT TO MODERATE PRECIP MAINLY OVER AREAS FROM
I-80 NORTHWARD ON MONDAY INTO TUESDAY. THE LATEST NBM IS PICKING UP
ON THIS PRECIP AS WELL...AND FOR THE MORNING FORECAST WAS USED WITH
A BLEND OF THE 04/00Z EC AND LATEST WPC QPF. THIS BRINGS TOTALS OF
0.25- TO 0.75-INCH OVER THE HIGHER TERRAIN OF NORTHERN CA AND THE
SOUTHERN OR CASCADES...AS WELL AS 0.10- TO 0.33-INCH FOR WETTER
LOCATIONS OF NORTHERN NV.
THIS FEATURE WILL SLOWLY MOVE OUT THROUGH THE MIDDLE OF NEXT WEEK
WITH AN UPR RIDGE BUILDING OVER THE EASTERN PACIFIC NUDGING TOWARD
THE WEST COAST THE FOLLOWING WEEKEND.
FREEZING LEVELS TODAY INTO TOMORROW WILL RANGE FROM 13000-FEET FOR
AREAS NEAR THE CA/OR BORDER TO 17000-FEET FOR CENTRAL AND SOUTHERN
CA. THESE WILL DIP THIS WEEKEND WITH THE ARRIVAL OF THE FIRST SYSTEM
ALONG THE WEST COAST...DOWN TO ABOUT 8000- TO 10000-FEET NEAR THE
CA/OR BORDER TO 15500-FEET CLOSE TO THE CA/MX BORDER. THEN AS THE
SECOND SYSTEM ARRIVES...THESE WILL DROP A BIT MORE FOR AREAS NEAR
THE CA/OR BORDER FROM 6500- TO 8000-FEET...BUT REMAIN RELATIVELY
ELEVATED ACROSS CENTRAL AND SOUTHERN CA.
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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