Strong April storms brought heavy rain to much of Alameda County. Landslides, eroding hillsides and cracked pavement was the result of the persistent rainfall - prompting nearly $10 million damage to county roadways.
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.
Strong April storms brought heavy rain to much of Alameda County. Landslides, eroding hillsides and cracked pavement was the result of the persistent rainfall - prompting nearly $10 million damage to county roadways. Oversatureated earth also caused landslide or erosion problems on private properties which spilled over onto county rights-of-way.
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 Apr 6, 1:49 PM PST, 1 hour 11 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SAN FRANCISCO CA 249 PM PDT THU APR 6 2006 .DISCUSSION...LOW CLOUDS PERSISTING OVER MUCH OF NORTHERN COUNTIES NORTH OF MONTEREY BAY WITH STRATOCUMULUS DECK HOVERING NEAR 5000 FEET...WHILE SOUTHERN AREAS ARE ENJOYING MOSTLY SUNNY SKIES. THIS SUNSHINE WILL BE SHORT-LIVED AS THE NEXT SYSTEM CONTINUES TO MOVE TOWARD THE DISTRICT. EXPECT INCLEMENT WEATHER TO ENTER OUR COASTAL WATERS BY FRIDAY MORNING AND REACH THE NORTH BAY AREAS IN THE EARLY AFTERNOON. THE UPPER LEVEL JET PROGGED TO BE OVER CNTRL CA COAST BY FRIDAY LATE AFTERNOON PROVIDING GOOD UPPER LEVEL DYNAMICS FOR AREAS NORTH OF SANTA CRUZ...WITH RAINFALL AMOUNTS BY 5AM SATURDAY REACHING 0.25 INCHES IN THE VALLEYS AND OVER 0.50 INCHES IN THE HILLS. SOUTH OF SANTA CRUZ SHOULD SEE LESSER RAINFALL TOTALS WITH THE MAIN LOW PRESSURE CENTER REMAINING OFF THE COAST OF NRN CA. THE UPPER TROUGH IS FORECAST TO REMAIN OFF THE NRN CA COAST THROUGH THE WEEKEND...WITH THE CHANCE OF SHOWERS REMAINING THROUGH THE REST OF THE WEEKEND WITH BEST CHANCES OF RAIN CONTINUING NORTH OF MONTEREY BAY. THE LOW FINALLY MOVES INLAND LATE SUNDAY ONLY TO HAVE THE NEXT SYSTEM ENTER THE AREA ON ITS HEELS...BRINGING MORE INCLEMENT WEATHER TO NRN ZONES MONDAY NIGHT AND THEN THE ENTIRE DISTRICT BY TUESDAY MORNING. BOTH THE GFS AND EUROPEAN MODEL PLACE THE CENTER OF STORM DIRECTLY OFF THE CNTRL CA COAST BY TUESDAY NIGHT WITH MODERATE TO HIGH QPF VALUES (RAIN) FROM POINT CONCEPTION NORTHWARD. MODELS THEN CONTINUE MOVING THE UPPER LOW SOUTHWARD THROUGH MIDWEEK DRAGGING THE HEAVIEST RAINS WITH IT INTO SOUTHERN CA. && .PREVIOUS AVIATION...12Z KOAK RAOB SHOWS SOME WEAK LOW LEVEL INSTABILITY JUST BELOW THE 5-6KFT CAP...THUS THE LINGERING LOW STRATOCU ACROSS THE SFO BAY TERMINALS. EXPECT THESE CLOUDS TO DISPERSE SOMEWHAT AS THE LOW LEVELS BECOME BETTER MIXED LATER THIS MORNING...AND BY MIDDAY MOST CLOUDINESS SHOULD BE FOCUSED NEAR THE HILLS WITH VFR CONDITIONS AT ALL TERMINALS. LIGHT/VRBL WINDS SHOULD GIVE WAY TO BROADER ONSHORE FLOW THIS AFTERNOON. WINDS TURN BACK TO SE LATE TONIGHT (AFTER THE EVENING PUSH) AS OUR NEXT COLD FRONT APPROACHES. && .MTR WATCHES/WARNINGS/ADVISORIES...NONE. PUBLIC FORECAST: MORRISON MARINE/AVIATION: WEAGLE NWS ON THE WEB AT WEATHER.GOV/SANFRANCISCO
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SAN FRANCISCO CA 600 AM PDT THU APR 6 2006 CAZ006-505>518-071300- BIG SUR COAST- SOUTHERN SALINAS VALLEY/ARROYO SECO AND LAKE SAN ANTONIO- SANTA LUCIA MOUNTAINS AND LOS PADRES NATIONAL FOREST- MOUNTAINS OF SAN BENITO COUNTY AND INTERIOR MONTEREY COUNTY INCLUDING PINNACLES NATIONAL MONUMENT-SAN FRANCISCO- COASTAL NORTH BAY INCLUDING POINT REYES NATIONAL SEASHORE- NORTH BAY INTERIOR VALLEYS-NORTH BAY MOUNTAINS- SAN FRANCISCO BAY SHORELINE-EAST BAY INTERIOR VALLEYS- SAN FRANCISCO PENINSULA COAST-EAST BAY HILLS AND THE DIABLO RANGE- SANTA CRUZ MOUNTAINS-SANTA CLARA VALLEY INCLUDING SAN JOSE- MONTEREY BAY/NORTHERN SALINAS VALLEY/HOLLISTER VALLEY AND CARMEL VALLEY- 600 AM PDT THU APR 6 2006 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE SAN FRANCISCO AND MONTEREY BAY AREAS. .DAY ONE...TODAY NO HAZARDOUS WEATHER IS EXPECTED. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY THE NEXT COLD FRONT WILL MOVE INTO THE AREA BY FRIDAY AFTERNOON WITH MORE RAIN...BUT MAINLY LIGHT. UNSEASONABLY COOL WEATHER WITH CONTINUED CHANCES OF SHOWERS WILL CONTINUE THROUGH THE WEEKEND. ANOTHER MORE ORGANIZED STORM WILL BRING RENEWED MODERATE TO HEAVY RAIN TO THE ENTIRE FORECAST AREA LATE MONDAY THROUGH TUESDAY OF NEXT WEEK. SHOWERS WILL CONTINUE INTO WEDNESDAY. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
The national radar mosaic for the moment the first event began.
1 debris flow. Local standard time, as filed.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in California in 2006Every state in 2006This day in weather historyWarnings in California, April 2006
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: 5497356.