Strong thunderstorms across the Antelope Valley resulted in reports of flash flooding. In some sections of the southeast Antelope Valley, intersections were flooded with between 1 and 2 feet of water.
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The episode as NWS LOX wrote it up.
Strong thunderstorms across the Antelope Valley resulted in reports of flash flooding. In some sections of the southeast Antelope Valley, intersections were flooded with between 1 and 2 feet of water.
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 Los Angeles, CA wrote its last area forecast discussion before the first event at Apr 23, 1:00 PM PST, 3 hours 15 minutes earlier.
SOUTHWEST CALIFORNIA AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE LOS ANGELES/OXNARD CA 200 PM PDT THU APR 23 2015 .SYNOPSIS... LOW PRESSURE ALOFT WILL PERSIST OVER THE REGION INTO FRIDAY AND BRING A POSSIBILITY OF THUNDERSTORMS THROUGH THIS EVENING...AND SHOWERS THROUGH SATURDAY...PRIMARILY IN THE MOUNTAINS. THE TEMPERATURES WILL STAY AROUND NORMAL INTO FRIDAY...THEN WARM TO ABOVE NORMAL NEXT WEEK AS A HIGH MOVES IN. && .SHORT TERM (TODAY-SUN)... SIMILAR CONDITIONS TODAY AS YESTERDAY...WITH BELOW NORMAL TEMPERATURES...INCREASING AFTERNOON CLOUDS...AND THUNDERSTORMS PRETTY MUCH IN THE SAME MOUNTAIN AND DESERT LOCATIONS. THE NORTHERLY FLOW ALOFT IS PUSHING THE CLOUDS FROM THE MOUNTAIN SHOWERS AND THUNDERSTORMS TOWARD THE METRO AREAS (MORE SO THAN YESTERDAY)...AND THIS COULD PRODUCE A SHOWER OR TWO. EXPECTING THINGS TO QUIET DOWN LATER THIS EVENING AND NIGHT...BUT WITH AMPLE MOISTURE A LOW LEVELS AND INCREASING SOUTHWESTERLY FLOW...A FEW SHOWERS PRETTY MUCH ANYWHERE CANNOT BE DISCOUNTED (ALTHOUGH CHANCES ARE QUITE SMALL). THE LOW THAT GENERATED ALL THE CONVECTIVE ACTIVITY WILL MOVE INTO ARIZONA TOMORROW. THIS SHOULD KILL THUNDERSTORM CHANCES ON FRIDAY AND BRING A LITTLE MORE SUN OVERALL...BUT LOS ANGELES AND VENTURA COUNTY VALLEYS AND COASTS SHOULD SEE PLENTY OF CLOUDS WITH INCREASING AND MOIST SOUTHWEST FLOW. THIS FLOW WILL RESULT IN GUSTY WINDS OVER THE MOUNTAINS AND INTERIOR SECTIONS...AND WIND ADVISORIES MAY BE NEEDED FOR THE ANTELOPE VALLEY FOR THE AFTERNOON AND EVENING. TEMPERATURES SHOULD BE SIMILAR TO TODAY...BUT SLO AND SBA COUNTIES WILL BE A TOUCH WARMER WITH MORE SUNSHINE. A FRONTAL BAND CURRENTLY OFF THE OREGON COAST WILL SWEEP THROUGH THE REGION LATE FRIDAY NIGHT THROUGH SATURDAY. THE FLOW STAYS NORTHWESTERLY THROUGH THIS...WHICH MEANS SLO AND SBA COUNTY WILL HAVE THE BEST CHANCES TO SEE ANY PRECIPITATION...AS WELL AS THE NORTHERN MOUNTAINS SLOPES. EASTERN LOS ANGELES COUNTY COULD ALSO SEE A SHOWER OR TWO SATURDAY EVENING...BUT CHANCES ARE VERY SMALL FOR AREAS SOUTH OF POINT CONCEPTION. ANY RAIN THAT DOES FALL WILL BE LIGHT AND LIKELY WELL UNDER 0.25 INCHES. OF MORE CONCERN...STRONG NORTHWEST FLOW BEHIND THIS BAND WILL INCREASE SATURDAY NIGHT INTO SUNDAY. CURRENT PROJECTIONS PEG 50 KT WINDS AT 850 MB (5000 FEET) OVER THE I-5 CORRIDOR...WHICH WOULD SPELL WARNING LEVEL WINDS. A HIGH WIND WATCH SHOULD BE CONSIDERED DURING TOMORROW'S SHIFT. OTHERWISE EXPECTING A NUMBER OF WIND ADVISORIES...ESPECIALLY THE CENTRAL COAST AND THE SBA SOUTH COAST...AS WELL AS THE ANTELOPE VALLEY. BY SUNDAY...AMPLE CLEARING AND WARMING IS ON TRACK AS THE STRONG NORTHWEST FLOW CLEARS EVERYTHING OUT AND AN UPPER LEVEL RIDGE TO THE WEST BUILDS IN. .LONG TERM (MON-THU)... THE STRONG NORTHERLY WINDS FROM THE WEEKEND WILL SHIFT TO NORTHEASTERLY AND WEAKEN ON MONDAY AND TUESDAY. WHILE WINDS DO NOT LOOK TO BE STRONG ENOUGH FOR A WIND ADVISORY...IT WILL BE BREEZY IN THE FAVORED SPOTS. MEANWHILE...582DM (AT 500MB) RIDGE WILL SETTLE OVER THE SOUTHWEST STATES...AND BRING A HEALTHY DOSE OF WARMING. HIGH TEMPERATURES SHOULD BE AROUND 10 DEGREES ABOVE NORMAL THROUGH MID-WEEK...WITH PLENTY OF SUNSHINE. COOLING IS POSSIBLE TOWARD THE END OF THE WEEK AS THE RIDGE WEAKENS AND ONSHORE FLOW RETURNS. && .AVIATION...23/1800Z. MID/UPPER LEVEL TROUGH OF LOW PRESSURE CENTERED EAST OVER THE AREA WILL SHIFT EAST WHILE A TROUGH OF LOW PRESSURE UPSTREAM APPROACHES. UPPER LEVEL MODERATE NORTH WINDS WILL BECOME MODERATE WEST AFTER 24/20Z WHILE MID LEVEL LIGHT NORTH WINDS BECOME MODERATE NORTHWEST AFTER 24/04Z. ISOLATED THUNDERSTORMS ARE EXPECTED OVER THE HIGHER TERRAIN THROUGH 24/03Z. THE STORMS ARE EXPECTED TO MOVE SOUTH APPROXIMATELY 10-15 KT WITH TOPS 40KFT. MARINE LAYER AT LAX AT 1605Z IS NONE. KLAX...CIGS 060 BETWEEN 24/03-26/07Z. CHANCE CIGS 015 BETWEEN 24/10-24/19Z. KBUR...CIGS 050 BETWEEN 23/20-24/10Z. CHANCE CIGS 015 AFTER 24/10Z. VIRTUALLY CERTAIN - 95-100% VERY LIKELY - 80-95% LIKELY - 60-80% CHANCE - 30-60% VERY UNLIKELY - 20% OR LESS && .MARINE...23/200 PM. A GALE WATCH IS IN EFFECT FROM PIEDRAS BLANCAS TO POINT SAL 10-60 NM AND FROM POINT SAL TO SAN NICOLAS ISLAND SUNDAY MORNING THROUGH MONDAY MORNING. OTHERWISE NORTHWEST WINDS WILL LIKELY INCREASE TODAY AND SMALL CRAFT ADVISORY FOR WIND CONDITIONS WILL LIKELY EXIST TONIGHT AND AGAIN FRIDAY NIGHT FROM PIEDRAS BLANCAS TO SAN NICOLAS ISLAND. IT IS LIKELY NORTHWEST WINDS WILL INCREASE OVER THE SANTA BARBARA THROUGH SAN PEDRO BASINS SATURDAY AFTERNOON AND SMALL CRAFT ADVISORY CONDITIONS WILL EXIST THROUGH SATURDAY NIGHT AND POSSIBLY AGAIN SUNDAY AFTERNOON. && .LOX WATCHES/WARNINGS/ADVISORIES... GALE WATCH (SEE LAXMWWLOX). SMALL CRAFT ADVISORY (SEE LAXMWWLOX). && PUBLIC...KITTELL AVIATION/MARINE...30 SYNOPSIS...SETO WWW.WEATHER.GOV/LOSANGELES
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE LOS ANGELES/OXNARD CA 600 AM PDT THU APR 23 2015 CAZ034>041-044>046-051>054-059-087-088-547-548-241300- SAN LUIS OBISPO COUNTY CENTRAL COAST- SANTA BARBARA COUNTY CENTRAL COAST-SANTA YNEZ VALLEY- SAN LUIS OBISPO COUNTY INTERIOR VALLEYS-CUYAMA VALLEY- SANTA BARBARA COUNTY SOUTH COAST-VENTURA COUNTY COAST- LOS ANGELES COUNTY COAST INCLUDING DOWNTOWN LOS ANGELES- VENTURA COUNTY INTERIOR VALLEYS-VENTURA COUNTY COASTAL VALLEYS- SANTA MONICA MOUNTAINS RECREATIONAL AREA- SAN LUIS OBISPO COUNTY MOUNTAINS- SANTA BARBARA COUNTY MOUNTAINS-VENTURA COUNTY MOUNTAINS- LOS ANGELES COUNTY MOUNTAINS EXCLUDING THE SANTA MONICA RANGE- ANTELOPE VALLEY-CATALINA ISLAND-SANTA CLARITA VALLEY- LOS ANGELES COUNTY SAN FERNANDO VALLEY- LOS ANGELES COUNTY SAN GABRIEL VALLEY- 600 AM PDT THU APR 23 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHWESTERN CALIFORNIA. .DAY ONE... TODAY AND TONIGHT MAIN THREAT FOR TODAY WILL BE THE SLIGHT CHANCE OF THUNDERSTORMS ACROSS THE LOS ANGELES...VENTURA AND SANTA BARBARA COUNTY MOUNTAINS. STORMS THAT DEVELOP OVER THE MOUNTAINS COULD SEE A FEW ISOLATED SHOWERS DRIFT SOUTH OVER THE VALLEYS AND COASTAL AREAS OF LOS ANGELES AND VENTURA COUNTIES. A SLIGHT CHANCE OF THUNDERSTORMS HAS BEEN ADDED TO THE SAN GABRIEL VALLEY AS WELL LATE THIS AFTERNOON. THERE COULD BE SOME LOCAL FLOODING IN THE MOUNTAIN AREAS DUE TO THE BRIEF PERIODS OF HEAVY RAIN ASSOCIATED WITH ANY THUNDERSTORMS THAT DO DEVELOP. .DAYS TWO THROUGH SEVEN... FRIDAY THROUGH WEDNESDAY THERE WILL BE VERY GUSTY WINDS ACROSS THE ANTELOPE VALLEY FRIDAY AND SATURDAY WHICH COULD CAUSE BLOWING SAND AND DUST LOWERING VISIBILITY TO NEAR ZERO AT TIMES...ESPECIALLY SATURDAY WHEN THE STRONGEST WINDS ARE EXPECTED. WEST WINDS 25 TO 40 MPH WITH GUSTS TO 55 MPH ARE LIKELY ON SATURDAY. THERE WILL ALSO BE SUNDOWNER WIND EVENTS BOTH FRIDAY AND SATURDAY. SATURDAY SHOULD BE THE STRONGER OF THE TWO DAYS. WARMER CONDITIONS ARE EXPECTED EARLY NEXT WEEK. WITH THE WARMER CONDITIONS EXPECTED...THERE WILL BE THE POTENTIAL FOR ELEVATED FIRE DANGER EARLY NEXT WEEK AS WELL. KAPLAN
The Edwards AFB radar (KEYX), 59 km away, was scanning. The volume nearest the first event began at 00:16 UTC.
1 flash flood. Local standard time, as filed.
A strong thunderstorm generated flash flooding across southeastern sections of the Antelope Valley. Just southwest of El Mirage Road, water between 1 and 2 feet deep flooded several intersections.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in California in 2015Every state in 2015This day in weather historyWarnings in California, April 2015
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: 568872.