483
FNUS76 KMTR 202155
FWSMTR
SPOT FORECAST FOR OES PREPO WEATHER...MCFD ECC
NATIONAL WEATHER SERVICE SAN FRANCISCO CA
155 PM PST SAT DEC 20 2025
FORECAST IS BASED ON FORECAST START TIME OF 1400 PST ON DECEMBER 21.
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 RECIEVE 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 5 MPH AROUND SUNSET TONIGHT TO 20 MPH
WITH GUST TO 35 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.
SUNDAY
SKY/WEATHER.........CLOUDY. RAIN SHOWERS AND SLIGHT CHANCE OF
THUNDERSTORMS.
MAX TEMPERATURE.....55-59.
MIN HUMIDITY........94-98 PERCENT.
SURFACE WINDS (MPH).SOUTH WINDS 13 TO 19 MPH WITH GUSTS TO AROUND
33 MPH.
CHANCE OF PCPN......100 PERCENT.
CHANCE OF THUNDER...15 PERCENT.
MIXING HEIGHT.......2500 FT AGL.
TRANSPORT WINDS.....SOUTH AROUND 29 MPH.
MARINE LAYER........NONE.
SUNSET..............
SUNDAY NIGHT
SKY/WEATHER.........CLOUDY. RAIN.
MIN TEMPERATURE.....48-52.
MAX HUMIDITY........95-99 PERCENT.
SURFACE WINDS (MPH).SOUTHWEST WINDS 13 TO 19 MPH WITH GUSTS TO
AROUND 35 MPH DECREASING TO 6 TO 8 MPH WITH
GUSTS TO AROUND 21 MPH OVERNIGHT.
CHANCE OF PCPN......100 PERCENT.
CHANCE OF THUNDER...6 PERCENT.
MIXING HEIGHT.......400 FT AGL.
TRANSPORT WINDS.....SOUTHWEST AROUND 16 MPH.
MARINE LAYER........NONE.
SUNRISE.............
MONDAY
SKY/WEATHER.........CLOUDY. RAIN LIKELY IN THE MORNING, THEN RAIN
IN THE AFTERNOON.
MAX TEMPERATURE.....54-58.
MIN HUMIDITY........86-90 PERCENT.
SURFACE WINDS (MPH).LIGHT WINDS.
CHANCE OF PCPN......80 PERCENT.
CHANCE OF THUNDER...1 PERCENT.
MIXING HEIGHT.......800 FT AGL.
TRANSPORT WINDS.....NORTHWEST AROUND 5 MPH.
MARINE LAYER........NONE.
SUNSET..............
FORECASTER...D_FLYNN
REQUESTED BY...JONATHAN RICHARDSON
TYPE OF REQUEST...OTHER
.TAG 2527984.0/MTR
.DELDT 12/20/25
.FORMATTERVERSION 2.0.0
.EMAIL ECCDUTYOFFICER@MARINCOUNTY.GOV
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