An upper level trough brought rain and wind to the region.
Every event with a place to put it; 1 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS MTR wrote it up.
An upper level trough brought rain and wind to the region.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS San Francisco Bay Area, CA wrote its last area forecast discussion before the first event at Jan 25, 3:10 AM PST, 1 hour 20 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA CA 310 AM PST SUN JAN 25 2009 .DISCUSSION...AS OF 3:10 AM PST SUNDAY...SKIES CLEARED ACROSS MUCH OF THE NORTH BAY OVERNIGHT...BUT WIDESPREAD LOW CLOUDS REMAIN FROM SAN FRANCISCO SOUTHWARD. CLOUDS WILL BEGIN TO OVERSPREAD THE NORTH BAY BY SUNRISE AS A SHORTWAVE TROUGH CURRENTLY OFF THE COAST OF OREGON DROPS SOUTH ALONG THE NORTHERN CA COAST. SCATTERED LIGHT SHOWERS MAY DEVELOP IN THE NORTH BAY DURING THE MORNING HOURS AND ELSEWHERE DURING THE AFTERNOON. THE AIRMASS OVER OUR REGION IS CONSIDERABLY DRIER THAN IT WAS LATE LAST WEEK AND EARLIER THIS WEEKEND. CURRENT PW VALUES OVER THE BODEGA BAY GPS-IPW SITE ARE AT LESS THAN A HALF INCH. ALL CURRENT MODEL DATA INDICATE ONLY SCATTERED LIGHT SHOWERS ACROSS THE REGION TODAY AND TONIGHT WITH RAIN TOTALS NOT EXPECTED TO REACH A TENTH OF AN INCH IN MOST AREAS. THE COOL AIRMASS ARRIVING WITH THE INCOMING SYSTEM AND MOSTLY CLOUDY SKIES WILL RESULT IN BELOW NORMAL HIGH TEMPERATURES TODAY...MAINLY IN THE LOWER TO MID 50S. SCATTERED SHOWERS WILL TAPER OFF FROM NORTH TO SOUTH TONIGHT AS THE UPPER TROUGH AXIS DIGS INTO SOUTH-CENTRAL CA AND A DRIER NORTHERLY FLOW BEGINS TO DEVELOP. MONDAY SHOULD BE A DRY DAY FOR OUR REGION... EXCEPT PERHAPS FOR A FEW LINGERING SHOWERS ACROSS THE FAR SOUTH. BY MONDAY AFTERNOON SKIES WILL BE PARTLY TO MOSTLY SUNNY...BUT TEMPERATURES WILL REMAIN COOL AS 850 MB TEMPS HOVER AROUND MINUS 1 DEG C. BY MONDAY NIGHT SKIES WILL CLEAR AND NORTHERLY BREEZES WILL EASE...ESPECIALLY IN THE VALLEYS. THIS WILL SET THE STAGE FOR A CHILLY NIGHT ON MONDAY NIGHT WITH NORTH AND EAST BAY VALLEY LOCATIONS EXPECTED TO COOL INTO THE UPPER 20S AND LOWER 30S. THE REMAINDER OF THE FORECAST PERIOD (TUESDAY THROUGH SATURDAY) WILL BE DRY AND MILD AS AN UPPER RIDGE OVER THE EASTERN PACIFIC BUILDS EASTWARD OVER CA. A WARMING TREND DURING THE SECOND HALF OF THE WEEK WILL PUSH DAYTIME TEMPERATURES ABOVE NORMAL BY THURSDAY AND FRIDAY. MEDIUM RANGE MODELS AGREE THAT DRY AND MILD WEATHER WILL CONTINUE THROUGH ALL OF NEXT WEEKEND AND INTO EARLY NEXT WEEK AS WELL. && .AVIATION...AS OF 3:20 AM PST SUNDAY...CEILINGS HAVE CLIMBED TO 3000 FEET OR HIGHER. COOL TROUGH APPROACHING THE AREA DOES NOT HAVE THE LOW LEVEL MOISTURE SO IFR CEILINGS ARE NOT EXPECTED TODAY. INCREASING INSTABILITY WILL ALLOW 3000 FOOT CEILINGS TO LINGER THROUGHOUT THE DAY. BRISK WINDS OF 10-15 KNOTS WITH GUSTS TO 20 KNOTS ALSO EXPECTED THROUGH THE DAY. && .MTR WATCHES/WARNINGS/ADVISORIES...NONE && PUBLIC FORECAST: DYKEMA AVIATION/MARINE: W PI NWS ON THE WEB AT WEATHER.GOV/SANFRANCISCO
The national radar mosaic for the moment the first event began.
1 strong wind. Local standard time, as filed.
Strong winds mixed with saturated soils and caused several trees to fall and block Highway 9 near Pierce Road, west of Saratoga.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in California in 2009Every state in 2009This day in weather historyWarnings in California, January 2009
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 152556.