674
NGUS86 KRSA 281404
HCMRSA
HYDROMETEOROLOGICAL COORDINATION MESSAGE
NATIONAL WEATHER SERVICE / CALIFORNIA NEVADA RFC / SACRAMENTO CA
705 AM PDT THU MAY 28 2026
..COOL AND UNSETTLED TODAY SHIFTING EAST TOMORROW
..BECOMING WARMER AND DRIER INTO NEXT WEEK
METEOROLOGICAL CONDITIONS (THU AM - WED AM)
RADAR IMAGERY THIS MORNING SHOWS THE BEST AREA OF PRECIP CURRENTLY
IMPACTING THE SF BAY AREA DOWN ACROSS THE CENTRAL CA COAST...AS WELL
AS THE ADJACENT LOCATIONS OF THE SOUTHERN SACRAMENTO AND NORTHERN
SAN JOAQUIN VALLEYS THIS MORNING. PRECIP GAUGE REPORTS SINCE 28/12Z
SHOW WIDESPREAD LIGHT TO LOCALLY MODERATE PRECIP FALLING OVER THESE
AREAS WITH ANYWHERE FROM A FEW HUNDREDTHS OF AN INCH TO JUST SHY OF
0.20-INCH. THIS IS ALL ASSOCIATED WITH A DISTURBANCE ROTATING AROUND
THE NEARLY STATIONARY UPR LOW SPINNING JUST SOUTH OF LAKE TAHOE THIS
MORNING...VERY CLOSE TO ITS LOCATION AT THIS TIME YESTERDAY.
THROUGH TODAY...LOOK FOR THIS EMBEDDED DISTURBANCE OVER THE SF BAY
AREA TO ROTATE SOUTHWARD AND THEN INLAND ACROSS CENTRAL CA AROUND
THE PRIMARY CIRCULATION...INCREASING PRECIP OVER THE SOUTHERN SIERRA
LATER THIS AFTERNOON AND EVENING SIERRA. ALSO...A SECOND DISTURBANCE
CURRENTLY LOCATED OVER CENTRAL NV WILL MAKE ITS WAY NORTHWARD BEFORE
ARCHING ACROSS THE UPPER KLAMATH RIVER BASIN THIS AFTERNOON AND
EVENING. MOST RECENT MODELS ARE IN GOOD AGREEMENT WITH THIS AREA
SEEING WIDESPREAD MODERATE TO LOCALLY HEAVY PRECIP UNDER ANY
CONVECTIVE PRECIP THAT DOES ONCE AGAIN DEVELOP. SPC IS ACTUALLY
PINPOINTING AN AREA OF MARGINAL RISK FOR SEVERE STORMS TODAY OVER
THE UPPER KLAMATH...INDICATING THE POTENTIAL FOR CONVECTIVE STORMS.
INTO FRIDAY...A KICKER SYSTEM MOVING TOWARD THE GULF OF ALASKA AND
THE NORTHEAST PACIFIC WILL FINALLY START TO SHOVE THE UPR LOW
EASTWARD AS AN OPEN WAVE CROSSING THE WASATCH ON ITS WAY TOWARD THE
NORTHERN ROCKIES. PRECIP WILL BECOME MORE SCATTERED AND LIGHTER ON
FRIDAY...FOCUSING ON THE UPPER KLAMATH RIVER BASIN DOWN ACROSS THE
PIT RIVER BASIN TO THE NORTHERN SIERRA AS WELL AS THE NORTHERN TWO-
THIRDS OF NV.
WITH THE FLOW BECOMING A BIT MORE WESTERLY ACROSS THE REGION...A
WEAK DISTURBANCE MOVING THROUGH THE FLOW MAY TOUCH OFF A FEW SHOWERS
ON SATURDAY MAINLY OVER THE SIERRA AND NORTHERN NV.
HOWEVER...COVERAGE AND AMOUNTS WILL BE MINIMAL. HEIGHTS THEN BEGIN
TO RISE FOR NEXT WEEK WITH AN UPR RIDGE JUST OFF THE WEST
COAST...SITTING BETWEEN A DEEP UPR LOW OVER THE EAST-CENTRAL PACIFIC
AND A SYSTEM OVER THE NORTHERN ROCKIES.
FREEZING LEVELS THIS MORNING ARE VERY SIMILAR TO YESTERDAY GIVEN THE
STAGNANT PATTERN...AROUND 7500-FEET NEAR THE CORE OF THE UPR LOW AND
INCREASING AS DISTANCE FROM THE PRIMARY CIRCULATION BECOMES GREATER.
AS THE SYSTEM OPENS AND KICKS TO THE EAST...FREEZING LEVELS THIS
WEEKEND WILL GENERALLY RANGE FROM 10000- TO 13500-FEET...BUMPING UP
EVEN MORE INTO NEXT WEEK UP TO 12000- TO 15000-FEET BY EARLY
WEDNESDAY.
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
DRK
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