The third storm of the week moved into Southern California on the morning of January 20th, bringing yet another round of widespread heavy rain and mountain snow.
Every event with a place to put it; 4 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 SGX wrote it up.
The third storm of the week moved into Southern California on the morning of January 20th, bringing yet another round of widespread heavy rain and mountain snow.
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 Diego, CA wrote its last area forecast discussion before the first event at Jan 20, 9:30 AM PST, 1 hour 22 minutes earlier.
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</html>HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SAN DIEGO CA 645 AM PST WED JAN 20 2010 CAZ042-CAZ043-048-050-055>058-060>062-PZZ750-PZZ775-201200- ORANGE COUNTY COASTAL AREAS- SAN DIEGO COUNTY COASTAL AREAS- SAN BERNARDINO AND RIVERSIDE COUNTY VALLEYS-THE INLAND EMPIRE- SAN DIEGO COUNTY VALLEYS-SAN BERNARDINO COUNTY MOUNTAINS- RIVERSIDE COUNTY MOUNTAINS-SANTA ANA MOUNTAINS AND FOOTHILLS- SAN DIEGO COUNTY MOUNTAINS-APPLE AND LUCERNE VALLEYS- COACHELLA VALLEY-SAN DIEGO COUNTY DESERTS- COASTAL WATERS FROM SAN MATEO POINT TO THE MEXICAN BORDER AND OUT 30 NM- WATERS FROM SAN MATEO POINT TO THE MEXICAN BORDER EXTENDING 30 TO 60 NM OUT INCLUDING SAN CLEMENTE ISLAND- 645 AM PST WED JAN 20 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR ALL OF EXTREME SOUTHWESTERN CALIFORNIA. .DAY ONE...TODAY THROUGH TONIGHT A PAIR OF STORMS WILL CAUSE PERIODS OF HEAVY RAIN...STRONG GUSTY WINDS...SNOW AT THE HIGHER ELEVATIONS AND LARGE SURF. LOCAL FLOODING IS LIKELY. THERE WILL ALSO BE ISOLATED THUNDERSTORMS WITH THE POTENTIAL TO PRODUCE TORNADOES. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY A STORM WILL CAUSE PERIODS OF HEAVY RAIN...STRONG GUSTY WINDS...SNOW AT THE HIGHER ELEVATIONS AND LARGE SURF THURSDAY. LOCAL FLOODING IS LIKELY. THERE WILL ALSO BE ISOLATED THUNDERSTORMS WITH THE POTENTIAL TO PRODUCE TORNADOES. THE CHANCE OF THUNDERSTORMS CONTINUES FRIDAY. HIGH SURF WITH A CHANCE OF COASTAL FLOODING WILL LINGER INTO SUNDAY MORNING. .SPOTTER INFORMATION STATEMENT...SKYWARN SPOTTER ACTIVATION IS REQUESTED. ATKIN
PRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE SAN DIEGO CA
746 AM PST WED JAN 20 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0250 PM TSTM WND GST 4 E LAKESIDE 32.86N 116.85W
01/19/2010 E50.00 MPH SAN DIEGO CA BROADCAST MEDIA
*** 1 FATAL, 1 INJ *** SEVERAL WEATHER STATIONS ALONG THE
SAN DIEGO COAST AND IN THE VALLEYS REPORTED WIND GUSTS IN
EXCESS OF 50 MPH WITH THE PASSAGE OF A NARROW BAND OF
CONVECTION. NUMEROUS REPORTS OF TREE DAMAGE WERE
RECEIVED. A 58 YEAR OLD FEMALE WAS KILLED WHEN A 10 FOOT
DIAMETER TREE FELL ONTO HER MOBILE HOME AND TWO OTHER
MOBILE HOMES.
&&
RBALFOThe national radar mosaic for the moment the first event began.
2 high wind, 1 winter storm, 1 heavy snow, 1 strong wind, 1 heavy rain, 1 flash flood. Local standard time, as filed.
High winds began around 1052 PST and continued through 1254 PST. At 1952 PST, the Victorville ASOS reported a peak wind gust of 62 MPH. A CWOP station in Hesperia reported a peak gust of 61 MPH at 1254 PST.
High winds were measured by the Burns Canyon RAWS between 1151 and 1451 PST. Between 1251 and 1351 PST, a peak gust of 85 MPH was measured.
Snow began in the San Bernardino County mountains around 1200 PST. Spotters in Wrightwood, Forest Falls, and Blue Jay reported blizzard conditions throughout the day, with visibility near zero at times. Wind gusts in the area were around 40 MPH. By 1700 PST, Wrightwood had received twelve inches of snow. The snow finally ended around 2130 PST.
Snow began in the Riverside County mountains around 1230 PST. A trained spotter in Pine Cove reported that approximately 8 inches fell by 1700 PST, with an additional 1.5 inches falling through about 2330 PST.
A 40 inch diameter eucalyptus tree fell on the 400 block of Jasmine Street in Laguna Beach. The tree damaged a fence and gate opener between two houses. At Doheny State Beach, a eucalyptus tree fell on a camper shell. No injuries were reported with either event.
Heavy rain caused a 20 foot by 20 foot section of roof to collapse at an industrial building on Valley View St in La Palma around 1645 PST.
A band of convection moved through the San Diego County coastal areas between 1800 and 1900 PST. A clogged storm drain caused flooding at the intersection of Via de la Valle and Jimmy Durante Boulevard in Del Mar. Eight vehicles became trapped in the rapidly rising water, and eighteen people, including several children, had to be rescued by swift-water rescue teams and local lifeguards. There were no injuries.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in California in 2010Every state in 2010This day in weather historyWarnings in California, January 2010
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 2026-10-01. Each event’s entry at NCEI: 212002, 212001, 211832, 212000, 211811, 211802, 264902.