Alert archive / California / Flash Flood Watches in 2015

Flash Flood Watch 3, NWS Los Angeles, CA

July 29, 2015Los Angeles County, Santa Barbara County, California

NWS Los Angeles, CA issued this flash flood watch at Jul 29, 2015, 9:07 PM PDT for Los Angeles County, Santa Barbara County, California. It took effect at Jul 30, 2015, 6:00 AM PDT. It was in force for 16 hr.

The area

The counties it named.

The facts

Issued: Jul 29, 2015, 9:07 PM PDT (04:07 UTC)
In effect from: Jul 30, 2015, 6:00 AM PDT
Expired: Jul 30, 2015, 10:00 PM PDT
In force: 16 hr
Issued by: NWS Los Angeles, CA
Flood severity: None

Counties Los Angeles County, CA, Santa Barbara County, CA

The radar

The Los Angeles radar (KVTX), 6 km from the middle of the area, began a volume at 04:09 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What forecasters said that day

The local office's own words before this flash flood watch went out, 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 this flash flood watch went out at Jul 29, 8:33 PM PDT, 34 minutes earlier.

Area forecast discussion, Jul 29, 8:33 PM PDT, 34 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

Hazardous weather outlook, Jul 29, 12:09 PM PDT, 8 hours 58 minutes before

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE LOS ANGELES/OXNARD CA
1209 PM PDT WED JUL 29 2015

CAZ034>041-044>046-051>054-059-087-088-547-548-301300-
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-
1209 PM PDT WED JUL 29 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHWESTERN CALIFORNIA.

.DAY ONE... TODAY

THERE IS A SLIGHT CHANCE OF THUNDERSTORMS THIS AFTERNOON AND TONIGHT
IN THE MOUNTAINS OF LOS ANGELES AND VENTURA COUNTIES AND THE
ANTELOPE VALLEY...WITH A SLIGHT CHANCE OF THUNDERSTORMS ACROSS ALL
OF LOS ANGELES COUNTY BY LATE TONIGHT. ISOLATED FLASH FLOODING IS
POSSIBLE. THERE WILL BE A HIGH RISK OF RIP CURRENTS OVER THE LOS
ANGELES COUNTY BEACHES TODAY...WITH A MODERATE RISK OVER OTHER
BEACHES.

* HIGH RIP CURRENT RISK......SEE FZUS56 KLOX - SRFLOX FOR DETAILS *

* SPECIAL WEATHER STATEMENT..SEE WWUS86 KLOX - SPSLOX FOR DETAILS *

.DAYS TWO THROUGH SEVEN... THURSDAY THROUGH TUESDAY

THERE IS CHANCE OF SHOWERS AND A SLIGHT CHANCE OF THUNDERSTORMS
ACROSS MUCH OF THE REGION THURSDAY AND THURSDAY NIGHT. SOME
THUNDERSTORMS MAY PRODUCE HEAVY RAIN...ISOLATED FLASH FLOODING
POSSIBLE. THERE IS A SLIGHT CHANCE OF THUNDERSTORMS ACROSS INTERIOR
SECTIONS OF SAN LUIS OBISPO AND SANTA BARBARA COUNTIES...THE
MOUNTAINS OF LOS ANGELES AND VENTURA COUNTIES...AND THE ANTELOPE
VALLEY FRIDAY.THERE IS A SLIGHT CHANCE OF THUNDERSTORMS ACROSS THE
MOUNTAINS OF LOS ANGELES AND VENTURA COUNTIES...AND THE ANTELOPE
VALLEY SATURDAY AND SUNDAY.

* SPECIAL WEATHER STATEMENT..SEE WWUS86 KLOX - SPSLOX FOR DETAILS *

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

RK/DB

In the hours before

Special weather statement, Jul 29, 3:18 PM PDT, 5 hours 49 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE OXNARD CA
318 PM PDT WED JUL 29 2015

CAZ054-059-292315-
ANTELOPE VALLEY CA-
LOS ANGELES COUNTY MOUNTAINS EXCLUDING THE SANTA MONICA RANGE CA-
318 PM PDT WED JUL 29 2015

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN LOS ANGELES COUNTY
UNTIL 415 PM PDT...

AT 313 PM PDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM
NEAR NORTH OF PEARBLOSSOM AND EAST OF PALMDALE AND
LANCASTER...MOVING NORTHWEST AT ABOUT 15 MPH. IN ADDITION TO LOCAL
FLOODING OF ROADWAYS...HALF INCH HAIL AND WIND GUSTS UP TO 50 MPH
WILL BE POSSIBLE WITH THIS STORM. A FLASH FLOOD WARNING OR SEVERE
THUNDERSTORM WARNING MAY NEED TO BE ISSUED IF THIS STORM INTENSIFIES.

LOCATIONS IMPACTED MAY INCLUDE...LANCASTER...PALMDALE...LAKE LOS
ANGELES...PEARBLOSSOM...LAKE PALMDALE...SADDLEBACK BUTTE STATE
PARK...AND HIGHWAYS 138 AND 14.

LAT...LON 3445 11805 3482 11834 3482 11773 3451 11768
TIME...MOT...LOC 2213Z 240DEG 48KT 3474 11743

SUKUP

Special weather statement, Jul 29, 4:26 PM PDT, 4 hours 41 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE OXNARD CA
426 PM PDT WED JUL 29 2015

CAZ054-059-300015-
ANTELOPE VALLEY CA-
LOS ANGELES COUNTY MOUNTAINS EXCLUDING THE SANTA MONICA RANGE CA-
426 PM PDT WED JUL 29 2015

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN LOS ANGELES COUNTY
UNTIL 515 PM PDT...

AT 422 PM PDT...DOPPLER RADAR WAS TRACKING A CLUSTER OF STRONG
AND SLOW MOVING THUNDERSTORMS OVER THE EASTERN PORTION OF THE ANTELOPE
VALLEY AND SAN GABRIEL MOUNTAINS.

IN ADDITION TO FLOODING OF ROADWAYS...HALF INCH HAIL...WIND GUSTS
UP TO 50 MPH...AND FREQUENT LIGHTNING WILL CONTINUE WITH THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
LANCASTER...PALMDALE...LAKE LOS ANGELES...WRIGHTWOOD...PEARBLOSSOM...LLANO...
LITTLEROCK...AND BIG PINES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.

&&

LAT...LON 3425 11766 3424 11766 3454 11847 3482 11836
      3482 11767 3430 11765
TIME...MOT...LOC 2322Z 239DEG 49KT 3466 11769

GOMBERG/SUKUP

Local storm report, Jul 29, 4:53 PM PDT, 4 hours 14 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OXNARD CA
453 PM PDT WED JUL 29 2015

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0448 PM     FLASH FLOOD      1 E PEARBLOSSOM         34.50N 117.89W
07/29/2015                   LOS ANGELES        CA   TRAINED SPOTTER

            AT 440 PM IN LAKE LOS ANGELES SPOTTER REPORTED 8 INCHES
            OF WATER FLOODING THE ROADWAY AT THE INTERSECTION OF
            170TH ST. EAST AND AVE P8.

&&

SETO

Local storm report, Jul 29, 4:55 PM PDT, 4 hours 12 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

The office that day

Everything else NWS Los Angeles, CA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 29, 5:43 PM PDT	Flash Flood Warning	LOX	Los Angeles	107 min
Jul 30, 11:49 AM PDT	Flash Flood Warning	LOX	Santa Barbara, Ventura	3 hr
Jul 30, 1:29 PM PDT	Areal Flood Advisory	LOX	Los Angeles	3 hr
Jul 30, 1:48 PM PDT	Flash Flood Warning	LOX	Los Angeles, Ventura	3 hr
Jul 30, 1:50 PM PDT	Flash Flood Warning	LOX	Los Angeles	3 hr
Jul 30, 2:29 PM PDT	Flash Flood Warning	LOX	Los Angeles	2 hr
Jul 30, 2:47 PM PDT	Flash Flood Warning	LOX	Santa Barbara	3 hr
Jul 30, 2:47 PM PDT	Flash Flood Warning	LOX	Los Angeles, Ventura	3 hr
Jul 30, 3:09 PM PDT	Flash Flood Warning	LOX	Los Angeles	3 hr
Jul 30, 3:12 PM PDT	Severe Thunderstorm Warning	LOX	Los Angeles, Ventura	48 min
Jul 30, 3:52 PM PDT	Severe Thunderstorm Warning	LOX	Ventura	53 min
Jul 30, 3:55 PM PDT	Flash Flood Warning	LOX	Ventura	3 hr

Nearby

Flash Flood Watches in California, 2015 Every flash flood watch in 2015

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.