Monsoon thunderstorms erupted once more, with gusty downdraft winds, downing power lines and poles in the Coachella Valley.
Every event with a place to put it. 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.
Monsoon thunderstorms erupted once more, with gusty downdraft winds, downing power lines and poles in the Coachella Valley.
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 Sep 9, 7:50 AM PST, 3 hours 55 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SAN DIEGO CA 850 AM PDT MON SEP 9 2013 .SYNOPSIS... A WEAK LOW PRESSURE TROUGH PARKED OVER THE SOUTHWEST WILL BRING SLIGHT COOLING...BUT ALSO KEEP THE CHANCE FOR SHOWERS AND THUNDERSTORMS OVER THE MOUNTAINS AND DESERTS THROUGH MIDWEEK. A SHALLOW MARINE LAYER WILL KEEP THE COASTAL AREAS COOLER...WITH AREAS OF LOW CLOUDS AND FOG EXTENDING INTO THE WESTERN VALLEYS. TOWARD THE END OF THE WEEK...A RIDGE OF HIGH PRESSURE BUILDING IN FROM THE WEST WILL BRING WARMER WEATHER AND LESS MARINE CLOUDS. && .DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES... SATELLITE IMAGERY EARLY THIS MORNING SHOWED CONSIDERABLE MARINE CLOUDS OVER THE COASTAL WATERS...WHILE MID/HIGHER CLOUDS WERE SCATTERED OVER MUCH OF SOCAL. THE 12Z MIRAMAR SOUNDING HAD A STRONG 11 DEGREE C INVERSION BASED NEAR 1K FT AND A PW NOW DOWN TO 1.15 INCH. GPS SOUNDERS OVER THE DESERTS WERE HOLDING LEVELS CLOSER TO 1.5 INCHES. WINDS WERE 5-10 KT OUT OF THE NW UP THROUGH ABOUT 10K FT AND THE SOUNDING SHOWED GOOD POTENTIAL FOR CONVECTION WITH A DEEP DRY LAYER BELOW 10K FT. SURFACE DEWPOINTS REMAINED ELEVATED OVER THE LOWER DESERTS...BUT AT HIGHER ELEVATIONS...THE 24 HOUR TREND WAS A BIT LOWER. SURFACE PRESSURE GRADIENTS WERE WEAK AND SIMILAR TO YESTERDAY. MAIN CONCERN AGAIN TODAY AND FOR THE NEXT COUPLE OF DAYS WILL BE THUNDERSTORMS. MOISTURE AND INSTABILITY ARE SUFFICIENT FOR DEVELOPMENT THIS AFTERNOON WITH DAYTIME HEATING OVER THE ELEVATED TERRAIN. MODELS KEEP THE PRECIP THREAT MAINLY ALONG AND EAST OF THE MOUNTAINS. HOWEVER...GIVEN THE NORTHERLY DRIFT IN THE MID-LEVELS... SLIGHT CHANCE IS WARRANTED OVER THE INLAND EMPIRE...SANTA ANA MTNS... AND SAN DIEGO COUNTY FOOTHILLS THIS AFTERNOON. 12Z NAM SWINGS A VORT MAX SOUTH OVER THE AREA THIS AFTERNOON/EVENING ACCOMPANIED BY MODERATE MID-LEVEL INSTABILITY...SO WITH HEATING...SHWRS/TSTMS SHOULD DEVELOP. ALONG THE COAST...THE SHALLOW MARINE LAYER SHOULD KEEP COASTAL AREAS COOLER THAN THE PAST FEW DAYS. HOWEVER...INLAND...ABOVE THE SHALLOW MARINE LAYER...IT WILL REMAIN QUITE WARM. HIGH PRESSURE OVER THE GREAT PLAINS THIS MORNING IS STILL FORECAST TO DRIFT EASTWARD...WHILE A WEAK LOW PRESSURE TROUGH REMAINS STATIONARY ACROSS THE WEST. GLOBAL MODELS SHOW THE PATTERN MORPHING INTO A REX BLOCK WITH A WEAK UPPER LOW HOLDING OVER THE SW THROUGH AT LEAST THU. HEIGHTS DO GRADUALLY RISE OVER SOCAL AFTER MIDWEEK WITH SOME DRYING AND WARMING. IN THE MEANTIME...LINGERING MOISTURE AND INSTABILITY UNDER THE UPPER LOW WILL CONTINUE A THREAT OF THUNDERSTORMS...EVEN NOCTURNALLY AND MAINLY ALONG AND EAST OF THE MOUNTAINS. ONCE THE UPPER LOW FINALLY DEPARTS TO THE NE...HIGH PRESSURE BUILDS IN ALOFT WITH A CENTER OVER SOCAL. THIS SHOULD RESULT IN VERY WARM WEATHER ALL THE WAY TO THE COAST AGAIN NEXT WEEKEND. && .AVIATION... 0915000...COASTAL STRATUS WILL CONTINUE DISSIPATE THROUGH 09/1600Z. THIS EVENING...LOW CLOUDS WILL PUSH ASHORE 10 TO 15 MILES...FIRST REACHING THE COASTAL AIRPORTS BETWEEN 10/0200-0500Z WITH BASES 900 FT MSL AND TOPS TO AROUND 1500 FT MSL. VIS REDUCED LOCALLY TO 2-5 SM EXPECTED WHERE LOW CLOUDS INTERSECT TERRAIN. LOW CLOUDS AND FOG WILL ERODE TO THE COAST BETWEEN 10/1500Z-1700Z. MOUNTAINS/DESERTS...ISOLATED TO SCATTERED THUNDERSTORMS ARE EXPECTED ON THE MOUNTAIN RIDGETOPS AGAIN BETWEEN 18-01Z THIS AFTERNOON. SOME OF THESE STORMS WILL MOVE SOUTHWARD AND INTO THE COACHELLA VALLEY. BASES WILL BE AROUND 8000 FEET ASL WITH TOPS TO 40000 FEET. LOCAL VIS REDUCED IN +TSRA TO 2SM AND GUSTY VARIABLE WINDS TO 40 MPH POSSIBLE AROUND STORMS. OTHERWISE...SCATTERED TO BROKEN CLOUDS AOA 12000 FEET THROUGH TONIGHT. && .SGX WATCHES/WARNINGS/ADVISORIES... CA...NONE. PZ...NONE. && PUBLIC...JAD AVIATION/MARINE...JT
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SAN DIEGO CA 445 AM PDT MON SEP 9 2013 CAZ055-056-058-060>062-092300- SAN BERNARDINO COUNTY MOUNTAINS- RIVERSIDE COUNTY MOUNTAINS- SAN DIEGO COUNTY MOUNTAINS- APPLE AND LUCERNE VALLEYS- COACHELLA VALLEY- SAN DIEGO COUNTY DESERTS- 445 AM PDT MON SEP 9 2013 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EXTREME SOUTHWESTERN CALIFORNIA. .DAY ONE...TODAY AND TONIGHT. SCATTERED AFTERNOON THUNDERSTORMS WITH GUSTY WINDS AND AREAS OF HEAVY RAIN. LOCALIZED FLASH FLOODING POSSIBLE. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY. ISOLATED AFTERNOON SHOWERS AND THUNDERSTORMS OVER THE MOUNTAINS AND DESERTS TUESDAY AND WEDNESDAY. .SPOTTER INFORMATION STATEMENT... SKYWARN WEATHER ACTIVATION MAY BE REQUESTED FOR THIS AREA TODAY. CAZ042-043-048-050-057-092300- ORANGE COUNTY COASTAL AREAS- SAN DIEGO COUNTY COASTAL AREAS- SAN BERNARDINO AND RIVERSIDE COUNTY VALLEYS-THE INLAND EMPIRE- SAN DIEGO COUNTY VALLEYS- SANTA ANA MOUNTAINS AND FOOTHILLS- 445 AM PDT MON SEP 9 2013 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EXTREME SOUTHWESTERN CALIFORNIA. .DAY ONE...TODAY AND TONIGHT. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SKYWARN WEATHER ACTIVATION IS NOT REQUESTED FOR THIS AREA... HOWEVER WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS. MOEDE
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN DIEGO CA
910 AM PDT MON SEP 9 2013
...TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
...DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0300 PM FLASH FLOOD 3 E JULIAN 33.07N 116.54W
09/07/2013 SAN DIEGO CA NWS EMPLOYEE
WATER FLOWING OVER ROADWAY WITH WAVES OF
WATER UP TO 8 INCHES DEEP. MUD AND DEBRIS
REQUIRED REMOVAL BY CALTRANS FLASH FLOOD
DURATION 2 HOURS
&&
IRIS SYSTEMPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN DIEGO CA
918 AM PDT MON SEP 9 2013
...TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
...DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0530 PM FLOOD 18 SE BORREGO SPRINGS 33.09N 116.11W
09/07/2013 SAN DIEGO CA NWS EMPLOYEE
WATER FLOWING OVER SPLIT MOUNTAIN ROAD IN 2
LOCATIONS. DRAINING FROM HEAVY RAIN OVER
ENTRANCE TO FISH CREEK. WATER FLOWING 4
INCHES DEEP AND MUD 2 INCHES DEEP.
&&
IRIS SYSTEMPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN DIEGO CA
920 AM PDT MON SEP 9 2013
...TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
...DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0500 PM FLOOD 14 ESE BORREGO SPRINGS 33.15N 116.13W
09/07/2013 SAN DIEGO CA NWS EMPLOYEE
ENTIRE AIRPORT RUNWAY STRIP COVERED IN AREAS
OF 1 TO 3 INCHES OF WATER.
&&
IRIS SYSTEMPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN DIEGO CA
928 AM PDT MON SEP 9 2013
...TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
...DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0530 PM FLASH FLOOD 17 ESE BORREGO SPRINGS 33.13N 116.09W
09/07/2013 SAN DIEGO CA NWS EMPLOYEE
WATER 4 TO 8 INCHES DEEP FLOWING ACROSS
HIGHWAY 78. ESTIMATED 75 YARDS WIDE. FLASH
FLOOD DURATION 2 HOURS
&&
IRIS SYSTEMPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN DIEGO CA
936 AM PDT MON SEP 9 2013
...TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
...DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0215 PM TSTM WND DMG 13 NNW JULIAN 33.23N 116.70W
09/07/2013 SAN DIEGO CA NWS EMPLOYEE
LARGE TREE LIMB BROKEN AND LAYING BY HIGHWAY
79
&&
IRIS SYSTEMPRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE SAN DIEGO CA
940 AM PDT MON SEP 9 2013
...TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
...DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0630 PM HEAVY RAIN 3 W PINE VALLEY 32.85N 116.56W
09/07/2013 M1.66 INCH SAN DIEGO CA FIRE DEPARTMENT/R
MEASURED 1.66 INCHES OF RAINFALL TODAY FROM
3 SEPARATE THUNDERSTORMS, ONE AT 12:30PM,
THE SECOND AT 4:30PM, AND THE THIRD AT
6:30PM. HEAVY RAIN DURATION 6 HOURS
0530 PM FLASH FLOOD 17 ESE BORREGO SPRINGS 33.13N 116.09W
09/07/2013 SAN DIEGO CA NWS EMPLOYEE
WATER 4 TO 8 INCHES DEEP FLOWING ACROSS
HIGHWAY 78. ESTIMATED 75 YARDS WIDE. FLASH
FLOOD DURATION 2 HOURS
0530 PM FLOOD 18 SE BORREGO SPRINGS 33.09N 116.11W
09/07/2013 SAN DIEGO CA NWS EMPLOYEE
WATER FLOWING OVER SPLIT MOUNTAIN ROAD IN 2
LOCATIONS. DRAINING FROM HEAVY RAIN OVER
ENTRANCE TO FISH CREEK. WATER FLOWING 4
INCHES DEEP AND MUD 2 INCHES DEEP.
0500 PM FLOOD 14 ESE BORREGO SPRINGS 33.15N 116.13W
09/07/2013 SAN DIEGO CA NWS EMPLOYEE
ENTIRE AIRPORT RUNWAY STRIP COVERED IN AREAS
OF 1 TO 3 INCHES OF WATER.
0418 PM FLASH FLOOD 5 NNW SAN JACINTO 33.85N 117.01W
09/07/2013 RIVERSIDE CA DEPT OF HIGHWAY
CHP REPORTS ROCKS AND MUD DEBRIS GOING
ACROSS LAMBS CANYON NEAR SR79 AND GILMAN
SPRINGS RD.
0354 PM FLASH FLOOD 5 E MORENO VALLEY 33.94N 117.12W
09/07/2013 RIVERSIDE CA DEPT OF HIGHWAY
CHP REPORTED MUD SLIDE AND FLOODING IN #1 LN
OF HIGHWAY 60.
0315 PM HEAVY RAIN 4 SSE BORREGO SPRINGS 33.19N 116.32W
09/07/2013 M0.65 INCH SAN DIEGO CA TRAINED SPOTTER
SPOTTER REPORTED 0.65 INCHES OF RAINFALL AND
A WIND GUST OF 50 MPH (BOTH MEASURED). HEAVY
RAIN DURATION 30 MINUTES
0310 PM FLASH FLOOD 3 SSW CATHEDRAL CITY 33.80N 116.49W
09/07/2013 RIVERSIDE CA DEPT OF HIGHWAY
CHP REPORTED GOLF CLUB DRIVE CLOSED AT THE
WASH DUE TO FLOODING.
0300 PM FLASH FLOOD 3 E JULIAN 33.07N 116.54W
09/07/2013 SAN DIEGO CA NWS EMPLOYEE
WATER FLOWING OVER ROADWAY WITH WAVES OF
WATER UP TO 8 INCHES DEEP. MUD AND DEBRIS
REQUIRED REMOVAL BY CALTRANS FLASH FLOOD
DURATION 2 HOURS
0230 PM FUNNEL CLOUD 5 NNE PERRIS 33.86N 117.19W
09/07/2013 RIVERSIDE CA AMATEUR RADIO
HAM RADIO OPERATOR REPORTED 2 FUNNEL CLOUDS
ON LAKE PERRIS.
0156 PM FLASH FLOOD 16 SSE PINE VALLEY 32.63N 116.43W
09/07/2013 SAN DIEGO CA DEPT OF HIGHWAY
CALIFORNIA HIGHWAY PATROL REPORTED 5 OR 6
SPOTS OF WATER RUNNING ACROSS HIGHWAY 94
BETWEEN SHOCKEY TRUCK TRAIL AND SHERIDAN
ROADS...WITH A MAXIMUM WATER DEPTH OF 6
INCHES.
0145 PM HAIL 18 ENE VALLEY CENTER 33.35N 116.74W
09/07/2013 E0.25 INCH SAN DIEGO CA PUBLIC
PUBLIC REPORT OF PEA SIZE HAIL
0140 PM TSTM WND GST 12 NNW JULIAN 33.22N 116.70W
09/07/2013 M56 MPH SAN DIEGO CA MESONET
MESONET STATION MATAGUAY /MGYSD/
0140 PM NON-TSTM WND GST 12 NNW JULIAN 33.22N 116.70W
09/07/2013 M56 MPH SAN DIEGO CA MESONET
REPORTED BY MESONET STATION MATAGUAY /MGYSD/
0135 PM TSTM WND GST 16 S PINE VALLEY 32.62N 116.47W
09/07/2013 M55 MPH SAN DIEGO CA ASOS
ASOS STATION CAMPO /CZZ/
1222 PM FLOOD 1 E FOREST FALLS 34.09N 116.90W
09/07/2013 SAN BERNARDINO CA FIRE DEPT/RESCUE
MILL CREEK IS RUNNING 2 FEET DEEP AND 50
FEET WIDE. CAMPERS ARE STRANDED ON THE NORTH
SIDE OF MILL CREEK.
&&
TARDY/IRIS SYSTEMThe San Diego radar (KNKX), 116 km away, was scanning. The volume nearest the first event began at 19:46 UTC.
1 thunderstorm wind. Local standard time, as filed.
Thunderstorm wind gusts downed nine power poles in Bermuda Dunes. Estimated wind gusts 50 to 55 mph.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in California in 2013Every state in 2013This day in weather historyWarnings in California, September 2013
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: 478833.