897
NGUS86 KRSA 201344
HCMRSA
HYDROMETEOROLOGICAL COORDINATION MESSAGE
NATIONAL WEATHER SERVICE / CALIFORNIA NEVADA RFC / SACRAMENTO CA
645 AM PDT MON APR 20 2026
..COOLER AND UNSETTLED THROUGH WEDNESDAY
..BEST PRECIP ANTICIPATED OVER NORTHERN/CENTRAL CA
METEOROLOGICAL CONDITIONS (MON AM - SUN AM)
A DISTURBANCE THAT MOVED OFF THE ALEUTIAN ISLANDS LAST WEEKS HAS
SHIFTED TO THE SOUTHEAST AND SETTLED JUST WEST OF THE NORTHERN CA
COAST GENERALLY JUST OUTSIDE OF 130W THIS MORNING. SLOWER MODEL
SOLUTIONS WERE DEFINITELY THE WAY TO GO WITH THE PROGRESSION OF THIS
SYSTEM TOWARD THE WEST COAST AND EVENTUALLY AS IT SPREADS INLAND FOR
THE MIDDLE OF THE WEEK. RADAR IMAGERY SHOWS THE LEADING EDGE OF THE
PRECIP MAKING ITS WAY ONSHORE WITH A BAND OF PRECIP ALONG COASTAL
SECTIONS BETWEEN THE GOLDEN GATE AND CA/OR BORDER. SO FAR...PRECIP
GAUGES OVERNIGHT HAVE RECORDED ANYWHERE FROM 0.01- AND 0.33-INCH
WITH THE GREATEST AMOUNTS OVER THE KING RANGE LOCATED ON CAPE
MENDOCINO.
THROUGH TODAY...LOOK FOR THE UPR LOW TO SLOWLY MAKE ITS WAY EASTWARD
AND MOVE WITHIN 130W OVERNIGHT...CONTINUING TO SPREAD PRECIP INLAND
ACROSS MUCH OF NORTHERN CA AND REACHING BACK ACROSS THE MONTEREY BAY
AREA. OVERALL TOTALS WILL GENERALLY RANGE FROM 0.50- TO 1.00-INCH.
THEN INTO TOMORROW...THE SYSTEM WILL INCREASE ITS FORWARD SPEED AND
SHIFT INLAND ACROSS NORTHERN CA. THIS WILL BRING AN AREA OF
WIDESPREAD PRECIP ACROSS NORTHERN/CENTRAL CA REACHING PAST THE CREST
OVER NORTHERN/CENTRAL NV. BEST TOTALS WILL FALL OVER THE LENGTH OF
THE SIERRA WITH 1.00- TO 2.00-INCHES POSSIBLE. ALSO...SPC IS
PAINTING AN BROAD AREA OF GENERAL THUNDERSTORMS ACROSS MUCH OF
NORTHERN AND CENTRAL CA ON DAY 2...WHICH COVERS THE PERIOD FROM
TUESDAY 12 UTC THROUGH WEDNESDAY 12 UTC. CONVECTIVE CELLS COULD
RESULT IN LOCALIZED HEAVIER PRECIP AMOUNTS.
WEDNESDAY WILL SEE LINGERING PRECIP ACROSS THE NORTHERN HALF OF THE
AREA AS CYCLONIC FLOW CONTINUES OVER THE REGION. BEST TOTALS WILL
CONTINUE TO BE OVER UPSLOPE PORTIONS OF THE NORTHERN/CENTRAL SIERRA
WITH ANOTHER 0.10- TO 0.33-INCH ANTICIPATED. THEN THURSDAY WILL BE A
GENERAL DRY DAY BEFORE A DISTURBANCE MOVING ACROSS THE PACIFIC
TOWARD THE CENTRAL/SOUTHERN CA COAST POSSIBLY MOVES CLOSE ENOUGH TO
BRING SCATTERED LIGHT PRECIP LATER FRIDAY THROUGH SATURDAY. OVERALL
TOTALS AT THIS POINT DO NOT LOOK OVERLY IMPRESSIVE.
FREEZING LEVELS WILL BOTTOM OUT AS THE CORE OF THE COOLER AIRMASS
MOVES ACROSS NORTHERN/CENTRAL CA TOWARD NORTHERN NV LATE TUESDAY
INTO EARLY WEDNESDAY...DROPPING DOWN TO 5000- TO 6500-FEET. THESE
WILL REBOUND AS THE UPR LOW SHIFTS EAST.
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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