A low pressure trough moving across the area caused isolated high wind on the desert slopes of the mountains. A truck overturned on S22 in the San Diego County mountains after the driver lost control of his rig during a strong gust of wind.
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The episode as NWS SGX wrote it up.
A low pressure trough moving across the area caused isolated high wind on the desert slopes of the mountains. A truck overturned on S22 in the San Diego County mountains after the driver lost control of his rig during a strong gust of wind.
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 Apr 11, 1:00 PM PST, 4 hours 36 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SAN DIEGO CA 200 PM PDT WED APR 11 2007 .SYNOPSIS... A POTENT LOW PRESSURE TROUGH WILL BRING STRONG WINDS TO THE MOUNTAINS AND DESERTS THROUGH THURSDAY. THIS TROUGH WILL BRING CLOUDS WEST OF THE MOUNTAINS ALONG WITH A SLIGHT CHANCE OF SHOWERS TONIGHT AND THURSDAY MORNING. HIGH PRESSURE AND OFFSHORE FLOW WILL BRING WARMING FRIDAY. THEN ANOTHER STRONG UPPER TROUGH WILL BRING MORE STRONG WINDS AND COOLER WEATHER SATURDAY NIGHT AND SUNDAY. && .DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES. THE COASTAL EDDY AND THE MARINE LAYER WILL GET WASHED OUT THIS AFTERNOON AND EVE AS A VIGOROUS TROUGH OF LOW PRESSURE APPROACHES FROM THE NORTHWEST. THE WINDS WILL CONTINUE TO INCREASE THIS AFTERNOON AND EVE. A STRONG BUT DRY TROUGH WILL DIG SOUTHWARD AS IT MOVES INLAND EARLY THU. THE WIND SPEEDS WILL BE STRONGEST FROM THE WEST THIS AFTERNOON AND EVE...WITH A MINOR DROP OFF LATE TONIGHT...THEN STRONG FROM THE NORTHWEST THU ALL DAY INTO THE EVE. THE STRONGEST WINDS WILL BE IN THE MTNS AND DESERTS...SPECIFICALLY THE EASTERN SLOPES AND ADJACENT DESERTS. MTN WAVE AND ROTOR ACTION IS EXPECTED IN THOSE AREAS. THE FIRE POTENTIAL WILL INCREASE...BUT NOT ENOUGH TO REACH WARNING LEVELS. MOISTURE WITH THIS TROUGH IS ONLY VERY HIGH OR IN THE MARINE LAYER...SO PRECIP CHANCES ARE RIGHTLY SLIGHT. THE TROUGH PASSES THU NIGHT ALLOWING OFFSHORE FLOW AND HIGH PRESSURE TO BUILD FRI MORNING. THERE WILL BE SOME OFFSHORE WINDS EARLY FRI...BUT NOT TOO STRONG AND NOT FOR LONG. THE RIDGE CONTINUES SAT MORNING WITH NEUTRAL FLOW WHICH WILL ALLOW THE COAST TO COOL SLIGHTLY WHILE THE INTERIOR CONTINUES TO WARM SLIGHTLY. THE NEXT TROUGH APPROACHES FROM THE NORTHWEST AND LOOKS VERY SIMILAR TO THE FIRST TROUGH IN THAT THE TROUGH DIGS SOUTHWARD AND THAT THE MOISTURE IS ONLY VERY LOW OR VERY HIGH...SO ONLY A SLIGHT CHANCE OF SHOWERS IS EXPECTED AGAIN. WINDS WILL PICK UP LATE SAT AND INCREASE SUN AS THE TROUGH AXIS PASSES THROUGH SOCAL. THIS PRODUCES NORTHERLY FLOW ON MON MORNING. THE WINDS ON SUN LOOK EVERY BIT AS STRONG AS THOSE WE EXPECT ON THU. THE RIDGE BUILDS NICELY MON AND TUE AND WEAK OFFSHORE FLOW SETS UP MON NIGHT FOR A SIGNIFICANT WARMING TREND. THE NEXT UPSTREAM TROUGH FOR WED AND THU...ONE THAT APPEARED ON THE SAME PARADE ROUTE AS THESE PREVIOUS TROUGHS AND SHOWED ANOTHER WIND EVENT...HAS CHANGED ON THE LATEST EXTENDED GUIDANCE. IT NOW GOES HARMLESSLY TO THE NORTH WED AND THU LEAVING SOCAL IN A FAIR AND RELATIVELY CALM PATTERN. && .AVIATION... 112023Z...COASTAL EDDY HELPING TO KEEP MARINE STRATUS OVER SOUTH COASTAL AREAS EARLY THIS AFTERNOON. BASES ARE NEAR 2K FT MSL WHILE TOPS SHOULD BE INCREASING TO NEAR FL025. THE EDDY WILL LIKELY BRING AN EARLY RETURN OF STRATUS TO COASTAL AREAS WITHIN 10 MILES OF THE COAST THIS EVENING...WITH THE LAYER THICKENING TO AROUND FL035 BY 12Z THU. SOME DRIZZLE OR LIGHT SHOWERS WILL BE POSSIBLE BETWEEN 06Z AND 18Z THU WITH BRIEFLY LOWER IFR BASES AT TIMES. FARTHER INLAND... MOSTLY CLEAR WITH UNRESTRICTED VISIBILITY UNTIL AFTER 04Z WHEN MOIST UPSLOPE FLOW SHOULD RESULT IN WIDESPREAD MVFR/IFR CIGS AND OBSCURED COASTAL SLOPES BELOW FL045. MOUNTAIN PEAKS AND DESERT AREAS EXPECTED TO REMAIN MOSTLY CLEAR WITH UNRESTRICTED VISIBILITY...EXCEPT IN LOCAL AREAS OF BLOWING DUST. WEST WINDS OF 25 TO 35 KTS WITH GUSTS TO NEAR 50 KTS WILL BE POSSIBLE OVER AND EAST OF THE MTN PEAKS AS SIGNIFICANT TURBULENCE DEVELOPS IN MOUNTAIN WAVE AND ROTOR ACTIVITY WHICH WILL CONTINUE THROUGH THU. && .MARINE... OFFSHORE BUOYS INDICATE SIGNIFICANT WAVE HEIGHTS AROUND 10 FEET WHICH IS OUR CRITERIA FOR SMALL CRAFT ADVISORY FOR HAZARDOUS SEAS. MODELS INDICATE THE FIVE FOOT SOUTH SWELL HAS PEAKED AND WILL BEGIN TO SUBSIDE ONLY VERY SLOWLY ON THU INTO FRIDAY...WHILE THE SHORTER PERIOD WEST SWELL CONTINUES TO BUILD THROUGH THU. THIS SHOULD EVEN OUT THE HIGH SURF CONDITIONS FARTHER SOUTH INTO SAN DIEGO COUNTY. THE WNW SWELL WILL INCREASE THROUGH THE NIGHT...WITH A PEAK OF AROUND 11-12 FEET. THE HIGH SURF ADVISORY IS IN EFFECT THROUGH FRI NIGHT. THE COMBINED SEAS FROM THE SWELLS AND INCREASING WIND AND WIND WAVES WILL BE HAZARDOUS FOR SMALL CRAFT. STRONG WINDS TONIGHT THROUGH THU WILL ADD TO THE HAZARDOUS BOATING CONDITIONS AS SUSTAINED WEST WINDS OF 25 KNOTS OR MORE WILL OCCUR AT TIMES. && .SGX WATCHES/WARNINGS/ADVISORIES... WIND ADVISORY FOR THE MOUNTAINS AND DESERTS...SEE LAXNPWSGX. HIGH SURF ADVISORY FOR THE BEACHES...SEE LAXCFWSGX. HIGH RIP CURRENT RISK FOR THE BEACHES...SEE LAXSRFSGX. SMALL CRAFT ADVISORY FOR THE COASTAL WATERS...SEE LAXCWFSGX. && PUBLIC...MM AVIATION/MARINE...JAD
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SAN DIEGO CA 400 PM PDT WED APR 11 2007 CAZ042-043-048-050-055-056-057-058-060-061-062-PZZ750-PZZ775-121200- 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- 400 PM PDT WED APR 11 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR ALL OF EXTREME SOUTHWESTERN CALIFORNIA. .DAY ONE... REMAINDER OF TODAY AND TONIGHT. WIND ADVISORY FOR THE MOUNTAINS AND DESERTS...SEE LAXNPWSGX. BLOWING DUST AND SAND IS LIKELY IN THE DESERTS. SMALL CRAFT ADVISORY FOR THE COASTAL WATERS...SEE LAXCWFSGX. HIGH SURF ADVISORY FOR THE BEACHES...SEE LAXCFWSGX. HIGH RIP CURRENT RISK FOR THE BEACHES...SEE LAXSRFSGX. .DAYS TWO THROUGH SEVEN... THURSDAY THROUGH WEDNESDAY. WIND ADVISORY FOR THE MOUNTAINS AND DESERTS THROUGH THURSDAY EVENING...SEE LAXNPWSGX. BLOWING DUST AND SAND IS LIKELY IN THE DESERTS. HIGH SURF ADVISORY FOR THE BEACHES THROUGH FRIDAY...SEE LAXCFWSGX. HIGH RIP CURRENT RISK FOR THE BEACHES THROUGH SATURDAY...SEE LAXSRFSGX. SMALL CRAFT ADVISORY FOR THE COASTAL WATERS THROUGH THURSDAY NIGHT...SEE LAXCWFSGX. .SPOTTER INFORMATION STATEMENT... SKYWARN WEATHER ACTIVATION IS NOT REQUESTED FOR THIS AREA...HOWEVER WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS. DVA
The national radar mosaic for the moment the first event began.
3 high wind. Local standard time, as filed.
A 58 mph wind gust was measured by the Pinyon RAWS.
A 59 mph wind gust was measured by the Burns Canyon RAWS.
A 72 mph wind gust was measured at the Cleveland National Forest lookout tower on Los Pinos Mountain. The gusty winds caused a truck to overturn on S22.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in California in 2007Every state in 2007This day in weather historyWarnings in California, April 2007
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: 29321, 29320, 29328.