514
FNUS76 KMTR 202151
FWSMTR
SPOT FORECAST FOR OES PREPO WEATHER...MCFD ECC
NATIONAL WEATHER SERVICE SAN FRANCISCO CA
151 PM PST SAT DEC 20 2025
FORECAST IS BASED ON FORECAST START TIME OF 1400 PST ON DECEMBER 20.
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER
SERVICE.
DISCUSSION
A FLOOD WATCH IS IN EFFECT THROUGH 4 PM MONDAY. THE
HEAVY RAIN WILL ARRIVE EARLY SUNDAY AFTERNOON AND CONTINUE UNTIL
MONDAY MORNING BEFORE THE NORTH BAY GETS A BREAK. DURING THIS
TIME, THIS LOCATION IS EXPECTED TO RECEIVE 1-2 INCHES OF RAIN.
LOCALIZED FLOODING IS EXPECTED IN LOW-LYING URBAN AREAS AND SMALL
STREAMS AND CREEKS. SOME DEBRIS FLOWS ARE POSSIBLE, BUT WILL
BECOME MORE LIKELY LATER IN THE WEEK AS THE SOILS BECOME MORE
SATURATED. WINDS WILL REMAIN OUT OF THE SOUTH AND GRADUALLY RAMP
UP THROUGH THE NIGHT FROM 10 MPH AROUND SUNSET TONIGHT TO 20 MPH
WITH GUST TO 25 MPH BY SUNRISE SUNDAY. WINDS WILL REMAIN NEAR THIS
INTENSITY THROUGH THE DAY SUNDAY BEFORE TAPERING OFF TO A
MODERATE NORTHERLY BREEZE EARLY MONDAY MORNING. MORE RAIN IS ON
THE WAY THROUGHOUT THE WEEK, WITH THE NEXT HEAVY BAND EXPECTED TO
ARRIVE SOMETIME ON TUESDAY AND CONTINUE INTO WEDNESDAY NIGHT. THE
RAIN WILL BE SIMILAR BUT WINDS WILL LIKELY BE STRONGER WITH THIS
SECOND ROUND. MODERATE RAIN AND GUSTY WINDS WILL LINGER INTO
FRIDAY BEFORE THE WEATHER FINALLY BREAKS THIS WEEKEND. ALL TOLD WE
EXPECT AROUND 6-8 INCHES OF RAIN THROUGH THE WEEK.
REST OF TODAY
SKY/WEATHER.........CLOUDY. RAIN.
MAX TEMPERATURE.....54-58.
MIN HUMIDITY........91-95 PERCENT.
SURFACE WINDS (MPH).LIGHT WINDS.
CHANCE OF PCPN......100 PERCENT.
CHANCE OF THUNDER...2 PERCENT.
MIXING HEIGHT.......0 FT AGL.
TRANSPORT WINDS.....SOUTH AROUND 6 MPH.
MARINE LAYER........NONE.
SUNSET..............456 PM
TONIGHT
SKY/WEATHER.........CLOUDY. RAIN.
MIN TEMPERATURE.....51-55.
MAX HUMIDITY........98-100 PERCENT.
SURFACE WINDS (MPH).SOUTH WINDS 6 TO 14 MPH INCREASING TO 13 TO 19
MPH OVERNIGHT. GUSTS UP TO 33 MPH.
CHANCE OF PCPN......100 PERCENT.
CHANCE OF THUNDER...6 PERCENT.
MIXING HEIGHT.......0 FT AGL.
TRANSPORT WINDS.....SOUTH AROUND 21 MPH.
MARINE LAYER........NONE.
SUNRISE.............725 AM
SUNDAY
SKY/WEATHER.........CLOUDY. RAIN.
MAX TEMPERATURE.....54-58.
MIN HUMIDITY........97-100 PERCENT.
SURFACE WINDS (MPH).BREEZY. SOUTH WINDS 15 TO 21 MPH WITH GUSTS TO
AROUND 39 MPH.
CHANCE OF PCPN......100 PERCENT.
CHANCE OF THUNDER...14 PERCENT.
MIXING HEIGHT.......1900 FT AGL.
TRANSPORT WINDS.....SOUTH AROUND 29 MPH.
MARINE LAYER........NONE.
SUNSET..............456 PM
FORECASTER...D_FLYNN
REQUESTED BY...JONATHAN RICHARDSON
TYPE OF REQUEST...OTHER
.TAG 2527983.0/MTR
.DELDT 12/20/25
.FORMATTERVERSION 2.0.0
.EMAIL ECCDUTYOFFICER@MARINCOUNTY.GOV
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