- Special Weather Statement for San Fransisco Peninsula Coast County, California
- Special Weather Statement issued April 11 at 6:47PM PDT by NWS
- Effective: Thursday, April 12, 2018 at noon
- Expires: Wednesday, April 11, 2018 at 7:15 p.m.
...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN ALAMEDA AND SAN
MATEO COUNTIES UNTIL 715 PM PDT...
At 646 PM PDT, Doppler radar was tracking a line of intense showers
over San Bruno and offshore of San Mateo County, moving east at 30
mph.
Brief very heavy rain and winds in excess of 40 mph will be possible
with this line of showers.
Locations impacted include...
Oakland, Fremont, Hayward, San Mateo, San Leandro, Redwood City,
Alameda, Palo Alto, South San Francisco, San Bruno, Pacifica, Menlo
Park, Foster City, Burlingame, San Carlos, East Palo Alto, Belmont,
Millbrae, San Lorenzo and Castro Valley.
- Special Weather Statement for San Fransisco Peninsula Coast County, California
- Special Weather Statement issued January 20 at 12:25PM PST until January 22 at 9:00PM PST by NWS
- Effective: Wednesday, January 20, 2016 at 12:25 p.m.
- Expires: Friday, January 22, 2016 at 9 p.m.
...MORE RAIN ON THE WAY BEGINNING LATE THURSDAY...
...HEAVIEST RAIN FORECAST FRIDAY EVENING INTO SATURDAY MORNING...
A SYSTEM WILL APPROACH THE SAN FRANCISCO AND MONTEREY BAY REGION
LATER THIS WEEK WITH RAIN FORECAST TO RETURN TO THE NORTH BAY
LATE THURSDAY EVENING AND THEN DOWN TO THE REST OF OUR REGION
THURSDAY NIGHT INTO FRIDAY MORNING. RAIN WILL SWITCH OVER TO
SHOWERS BY LATE IN THE MORNING OR EARLY IN THE AFTERNOON ON
FRIDAY.
A SECOND PIECE OF ENERGY WILL QUICKLY MOVE TO OUR REGION WITH
ANOTHER ROUND OF RAIN FORECAST FOR FRIDAY EVENING INTO SATURDAY.
THIS SECOND FEATURE WILL BE MORE UNSTABLE AND HAVE A GREATER
POTENTIAL FOR PRODUCING MODERATE TO HEAVY RAIN AT TIMES. OF
BIGGEST CONCERN IS FOR LATE FRIDAY INTO SATURDAY MORNING WHEN A FRONT
IS EXPECTED TO MOVE THROUGH WHICH WILL LIKELY LEAD TO THE HIGHEST
RAINFALL RATES. RAIN WILL SWITCH OVER TO SHOWERS LATER ON SATURDAY
WITH A FEW THUNDERSTORMS POSSIBLE. IN ADDITION TO THE
PRECIPITATION, SOUTH TO SOUTWEST WINDS WILL BE ON THE INCREASE.
MANY LOCATIONS WILL SEE WINDS OF 15 TO 25 MPH WITH GUSTS TO 35 MPH
FOR FRIDAY INTO SATURDAY.
RAINFALL AMOUNTS BY SATURDAY AFTERNOON ARE FORECAST TO BE GREATEST
OVER COASTAL RANGES WHERE 2 TO 4 INCHES WILL BE COMMON. A FEW
LOCAL SPOTS WILL LIKELY SEE UPWARD OF 6". FOR URBAN LOCATIONS,
AMOUNTS WILL VARY FROM 1.5" TO 2.5" FOR THE NORTH BAY, TO .75" TO
1.25" FOR THE REST OF THE AREA.
AT THE PRESENT TIME, THE BEST POTENTIAL FOR HYDROLOGICAL ISSUES
WILL BE WITH THE SECOND PIECE OF ENERGY ESPECIALLY LATE FRIDAY
INTO EARLY SATURDAY. AREAS OF PARTICULAR CONCERN INCLUDE SPOTS
THAT EXPERIENCED MINOR FLOODING IN THE PAST SYSTEM INCLUDING
HIGHWAY 1 ALONG THE BIG SUR COAST, PLUS PORTIONS OF SANTA CRUZ AND
SONOMA COUNTIES.
CALIFORNIA KING TIDE WILL ALSO OCCUR FRIDAY MORNING AT 6.6 FEET
WITH A NEARLY IDENTICAL TIDAL HEIGHT SATURDAY MORNING AT 1030 AM
OF 6.5 FEET. THE OTHER HIGH TIDE WILL BE 5.2 FEET AT 1139 PM
FRIDAY NIGHT. THE HIGH TIDES FRIDAY AND SATURDAY MORNING WILL LEAD
TO SOME FLOODING. THE COMBINATION OF RAIN AND HIGH TIDE WILL LEAD
TO A HEIGHTENED RISK FOR FLOODING.
A LONG PERIOD WESTERLY SWELL WILL ALSO BE PRESENT ALONG THE COAST
THURSDAY NIGHT THROUGH FRIDAY WHICH WILL LEAD TO HAZARDOUS COASTAL
CONDITIONS.
PERSONS IN THE SAN FRANCISCO AND MONTEREY BAY REGION WITH OUTDOOR
PLANS FRIDAY AND SATURDAY SHOULD CLOSELY MONITOR THE LATEST
FORECASTS. IN ADDITION, PERSONS LOCATED NEAR STREAMS OR LOCATIONS
PRONE TO FLOODING SHOULD BE PREPARED FOR VERY RAPID RISES AND THE
POTENTIAL FOR FLOODING.
