Offshore flow in the wake of a passing trough of low pressure caused gusty Santa Ana winds in the Inland Empire. The strong winds downed trees and power lines in the usual areas, and overturned a big rig on Interstate 15 in Fontana.
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 SGX wrote it up.
Offshore flow in the wake of a passing trough of low pressure caused gusty Santa Ana winds in the Inland Empire. The strong winds downed trees and power lines in the usual areas, and overturned a big rig on Interstate 15 in Fontana. One downed power line sparked a small fire in Devore. A wind gust of 56 mph was measured nearby in Rialto.
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 Dec 28, 3:30 AM PST, 5 hours 15 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SAN DIEGO CA 330 AM PST THU DEC 28 2006 .SYNOPSIS...DEVELOPING OFFSHORE FLOW WILL CAUSE LOCAL STRONG GUSTY WINDS...MAINLY THROUGH AND BELOW MOUNTAIN CANYONS AND PASSES TODAY INTO FRIDAY. THE STRONGEST WINDS WILL BE BELOW THE CAJON PASS AND IN THE SANTA ANA MOUNTAINS. WEAKER OFFSHORE WINDS WILL CONTINUE THROUGH THE WEEKEND FOR FAIR AND WARMER WEATHER. UPPER LEVEL LOW PRESSURE WILL BRING MORE CLOUDS AND COOLING MONDAY FOLLOWED BY OFFSHORE FLOW ONCE AGAIN. && .DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES... .SHORT TERM (TODAY-SATURDAY)... KSOX RADAR DATA REMAINS UNAVAILABLE DUE TO HARDWARE PROBLEMS. THERE WERE SCATTERED CLOUDS EARLY THIS MORNING CAUSED BY WRAP AROUND MOISTURE FROM THE DEPARTING UPPER LOW. EARLY MORNING ACARS SOUNDINGS INDICATED STRONG NW WINDS ALOFT. ONSHORE GRADIENTS TO THE E WITH ABOUT 4 MB SAN-IPL. WEAK OFFSHORE GRADIENTS FROM THE N WITH ABOUT -5 MB SAN-TPH BUT WITH MODERATELY STRONG OFFSHORE TRENDS. OFFSHORE FLOW WILL CONTINUE TO DEVELOP THIS MORNING WITH STRONG UPPER AND THERMAL SUPPORT FOR STRONG WINDS. THE WINDS ALOFT AND THERMAL GRADIENTS WILL MAINLY BE FROM N TO S WITH WINDS INCREASING RAPIDLY THIS MORNING AFTER SUNRISE AND CONTINUING TO INCREASE THROUGH LATE MORNING. THE STRONGEST WINDS WILL BE THROUGH AND BELOW MOUNTAIN CANYONS AND PASSES...ESPECIALLY AROUND THE SAN BERNARDINO COUNTY MOUNTAINS AND INTO THE SANTA ANA MOUNTAINS. THE WINDS WILL ALSO SPREAD INTO THE ORANGE COUNTY COASTAL PLAIN AND THERE COULD BE ISOLATED STRONG NLY WINDS INTO THE COACHELLA VALLEY AND HIGH DESERTS. SOMEWHAT WEAKER WINDS WILL FILTER INTO SAN DIEGO COUNTY. THERE COULD BE AREAS OF REDUCED VISIBILITY IN THE INLAND EMPIRE AND COACHELLA VALLEY DUE TO BLOWING DUST AND SAND. THE WINDS WILL SLOWLY TURN A LITTLE MORE NE AND DECREASE FRI. COLD AIR ADVECTION WILL LIMIT WARMING...ESPECIALLY TODAY...WITH A LITTLE WARMING FRI. UPPER RIDING AND WEAK OFFSHORE FLOW WILL BRING MORE WARMING SAT. EXCEPT A FEW AREAS OF BROKEN CLOUDS THIS MORNING...SKIES WILL BE MOSTLY CLEAR WITH COOL NIGHTS AT THE LOWER ELEVATIONS IN AREAS PROTECTED FROM THE WINDS. .LONG TERM (SUNDAY-WEDNESDAY)...CONTINUED FAIR AND MILD SUN UNDER HIGH PRESSURE AND WEAK OFFSHORE FLOW. MODELS ARE LESS CONSISTENT BY MON AND CURRENTLY INDICATE AN UPPER LOW WITH LIMITED MOISTURE WILL BRING PARTLY CLOUDY SKIES AND COOLING. CANNOT COMPLETELY RULE OUT THE POSSIBILITY OF SHOWERS MON...BUT IT IS STILL TOO EARLY WITH TOO MUCH UNCERTAINTY IN THE MODEL RUNS TO INTRODUCE RAIN INTO THE FORECAST AT THIS TIME. AFTER THIS LOW MOVES THROUGH...OFFSHORE FLOW SHOULD DEVELOP TUE AND WED WITH MOSTLY CLEAR SKIES AND WARMER DAYS W OF THE MOUNTAINS. && .AVIATION... RESIDUAL LOWER LEVEL MOISTURE REMAINS...MAINLY ALONG AND WEST OF THE MOUNTAINS. SATELLITE IMAGERY SHOWS A NARROW BAND OF BKN035-045 JUST INLAND FROM THE COASTLINE OF ORANGE AND SAN DIEGO COUNTIES IN A NARROW CONVERGENCE ZONE BETWEEN WEAK EASTERLY FLOW OVER LAND AND MODERATE NORTHWEST FLOW OVER THE COASTAL WATERS. SATELLITE IMAGERY ALSO SHOW AREAS OF CLOUDS OVER THE MOUNTAINS...MAINLY SAN DIEGO COUNTY AND OVER THE SAN BERNARDINO MOUNTAINS. THIS RESIDUAL MOISTURE AND CLOUDS SHOULD BEGIN TO SCATTER OUT SOON AFTER SUNRISE. MODERATE TO STRONG NORTH TO NORTHEAST WINDS ARE EXPECTED TO BEGIN TO DEVELOP THROUGH AND BELOW PASSES AND CANYONS AROUND SUNRISE...MAINLY ORANGE AND SAN BERNARDINO COUNTIES...INCREASING IN COVERAGE AND STRENGTH DURING THE MORNING. WINDS WILL GRADUALLY DECREASE TONIGHT AND FRIDAY. WINDS MAY GUST TO AROUND 50 KNOTS THROUGH AND BELOW PASSES AND CANYONS TODAY WITH VISIBILITIES LOCALLY REDUCED TO NEAR ZERO IN BLOWING DUST IN PORTIONS OF THE INLAND EMPIRE...MAINLY BELOW THE CAJON PASS. CONDITIONS WILL BE FAVORABLE TODAY FOR ROTOR/MOUNTAIN WAVE DEVELOPMENT SOUTH OF THE SAN BERNARDINO MOUNTAINS. && .MARINE... A LARGE NORTHWEST SWELL WILL GRADUALLY DECREASE THROUGH TONIGHT. MODERATE NORTHWEST WINDS WILL BECOME MODERATE NORTH TO NORTHEAST TODAY AS MODERATE TO STRONG NORTHERLY OFFSHORE FLOW DEVELOPS. THE COMBINATION OF THE LARGE NORTHWEST SWELL AND SHORT PERIOD WIND WAVES FROM THE MODERATE NORTH FLOW WILL CONTINUE TO CAUSE VERY HAZARDOUS BOATING CONDITIONS TODAY. GRADUALLY IMPROVING CONDITIONS ARE EXPECTED TONIGHT AND FRIDAY WITH DECREASING WIND AND SWELL. && .SGX WATCHES/WARNINGS/ADVISORIES... HIGH WIND WARNING UNTIL 2 PM FRI FOR THE SAN BERNARDINO COUNTY MOUNTAINS...INLAND EMPIRE AND SANTA ANA MOUNTAINS AND FOOTHILLS. WIND ADVISORY UNTIL 2 PM FRI FOR THE ORANGE COUNTY COASTAL AREAS...RIVERSIDE COUNTY MOUNTAINS...APPLE AND LUCERNE VALLEYS AND COACHELLA VALLEY. SMALL CRAFT ADVISORY TODAY FOR THE INNER AND OUTER COASTAL WATERS. HIGH SURF ADVISORY TODAY AT THE ORANGE AND SAN DIEGO COASTS. && PUBLIC...DVA AVIATION/MARINE...MARTIN
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SAN DIEGO CA 400 AM PST THU DEC 28 2006 CAZ042-043-CAZ048-050-055>058-060>062-PZZ750-775-290000- ORANGE COUNTY COASTAL AREAS-SAN DIEGO COUNTY COASTAL AREAS-SAN BERNARDINO AND RIVERSIDE COUNTY VALLEYS-THE INLAND EMPIRE-SAN DIEGO COUNTY VALLEYS-RIVERSIDE COUNTY MOUNTAINS-SANTA ANA MOUNTAINS AND FOOTHILLS-SAN DIEGO COUNTY MOUNTAINS-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- 400 AM PST THU DEC 28 2006 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHWEST CALIFORNIA. .DAY ONE...TODAY AND TONIGHT OFFSHORE FLOW WILL CAUSE LOCAL STRONG GUSTY WINDS THROUGH AND BELOW MOUNTAIN CANYONS AND PASSES. A HIGH WIND WARNING IS IN EFFECT FOR THE SAN BERNARDINO COUNTY MOUNTAINS...INLAND EMPIRE AND SANTA ANA MOUNTAINS. A WIND ADVISORY IS IN EFFECT FOR THE ORANGE COUNTY COASTAL AREAS...RIVERSIDE COUNTY MOUNTAINS...THE APPLE AND LUCERNE VALLEYS AND THE COACHELLA VALLEY. SEE LAXNPWSGX FOR DETAILS. HIGH SURF AND A HIGH RISK OF RIP CURRENTS AT THE BEACHES TODAY. SEE LAXCFWSGX AND LAXSRFSGX FOR DETAILS. SMALL CRAFT ADVISORY FOR ROUGH SEAS IN THE COASTAL WATERS TODAY. SEE LAXCWFSGX FOR DETAILS. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY OFFSHORE FLOW WILL CAUSE LOCAL STRONG GUSTY WINDS THROUGH AND BELOW MOUNTAIN CANYONS AND PASSES. A HIGH WIND WARNING WILL REMAIN IN EFFECT UNTIL 2 PM FRIDAY FOR THE SAN BERNARDINO COUNTY MOUNTAINS...INLAND EMPIRE AND SANTA ANA MOUNTAINS. A WIND ADVISORY WILL REMAIN IN EFFECT UNTIL 2 PM FRIDAY FOR THE ORANGE COUNTY COASTAL AREAS...RIVERSIDE COUNTY MOUNTAINS...THE APPLE AND LUCERNE VALLEYS AND THE COACHELLA VALLEY. SEE LAXNPWSGX FOR DETAILS. .SPOTTER INFORMATION STATEMENT...SKYWARN WEATHER ACTIVATION IS NOT REQUESTED AT THIS TIME...HOWEVER WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS. DVA
The national radar mosaic for the moment the first event began.
1 strong wind. 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, December 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: 6599.