Alert archive / California / Flash Flood Warnings in 2024

Flash Flood Warning 29, NWS Los Angeles, CA

March 30, 2024Los Angeles County, California

NWS Los Angeles, CA issued this flash flood warning at Mar 30, 2024, 3:58 AM PDT for Los Angeles County, California. It was in force for 4 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Mar 30, 2024, 3:58 AM PDT (10:58 UTC)
Expired: Mar 30, 2024, 8:00 AM PDT
In force: 4 hr
Issued by: NWS Los Angeles, CA
Area: Storm-based polygon
Flood severity: None

County Los Angeles County, CA

The radar

The Santa Ana Mts radar (KSOX), 71 km from the middle of the area, began a volume at 10:57 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.

The nearest sounding before it

San Diego, CA (KNKX), launched 00:00Z, 11.0 hours before the alert went out and 184 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1345 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 14 m²/s²
0-3 km storm-relative helicity: 107 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood warning 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 warning went out at Mar 30, 3:14 AM PDT, 44 minutes earlier.

Area forecast discussion, Mar 30, 3:14 AM PDT, 44 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>

In the hours before

Special weather statement, Mar 29, 10:35 PM PDT, 5 hours 23 minutes before

Special Weather Statement
National Weather Service OXNARD CA
1035 PM PDT Fri Mar 29 2024

CAZ347-349-300600-
Santa Barbara County Southwestern Coast CA-
Santa Barbara County Inland Central Coast CA-
1035 PM PDT Fri Mar 29 2024

...A STRONG THUNDERSTORM WILL IMPACT SOUTHWESTERN SANTA BARBARA
COUNTY THROUGH 1100 PM PDT...

At 1035 PM PDT, Doppler radar was tracking a strong thunderstorm near
Highway 101 through Gaviota State Park, or 10 miles northeast of
Point Conception, moving north at 30 mph.

HAZARD...Wind gusts of 50 to 55 mph and half inch hail. There is a
         small chance for a tornado.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to vegetation is
         possible.

Locations impacted include...
Highway 101 through Gaviota State Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3459 12036 3462 12021 3447 12024 3446 12034
      3446 12037
TIME...MOT...LOC 0535Z 202DEG 25KT 3451 12031

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...55 MPH

Cohen/Bruno

Special weather statement, Mar 29, 11:22 PM PDT, 4 hours 36 minutes before

Special Weather Statement
National Weather Service OXNARD CA
1122 PM PDT Fri Mar 29 2024

CAZ347>349-351-300715-
Santa Barbara County Southwestern Coast CA-Santa Ynez Valley CA-
Santa Ynez Mountains Western Range CA-
Santa Barbara County Inland Central Coast CA-
1122 PM PDT Fri Mar 29 2024

...STRONG THUNDERSTORMS WILL IMPACT CENTRAL SANTA BARBARA COUNTY
THROUGH 1215 AM PDT...

At 1121 PM PDT, Doppler radar was tracking strong thunderstorms along
a line extending from 13 miles northeast of San Miguel Island to
Highway 101 through Gaviota State Park. Movement was northeast at 30
mph.

HAZARD...Wind gusts of 50 to 55 mph and half inch hail. A brief,
         weak tornado cannot be ruled out.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to vegetation is
         possible.

Locations impacted include...
Santa Ynez...
Solvang...
Highway 101 through Gaviota State Park...
Refugio State Beach...
El Capitan State Beach...
Lake Cachuma...
and Highway 154 over San Marcos Pass.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3463 12014 3466 11997 3458 11987 3443 11994
      3446 12001 3446 12002 3447 12004 3446 12010
      3447 12013 3447 12023 3450 12023
TIME...MOT...LOC 0621Z 212DEG 26KT 3418 12021 3449 12021

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...55 MPH

Cohen/Bruno

Special weather statement, Mar 30, 1:25 AM PDT, 2 hours 33 minutes before

Special Weather Statement
National Weather Service OXNARD CA
125 AM PDT Sat Mar 30 2024

CAZ350-352-300845-
Santa Barbara County Southeastern Coast CA-
Santa Ynez Mountains Eastern Range CA-
125 AM PDT Sat Mar 30 2024

...A STRONG THUNDERSTORM WILL IMPACT SOUTHEASTERN SANTA BARBARA
COUNTY THROUGH 145 AM PDT...

At 125 AM PDT, Doppler radar was tracking a strong thunderstorm over
Carpinteria, or near Montecito, moving northeast at 15 mph.

HAZARD...Wind gusts of 50 to 55 mph and half inch hail. A brief and
         weak tornado could accompany this activity as it moves
         through Carpinteria.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to vegetation is
         possible.

Locations impacted include...
Carpinteria.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building. Torrential
rains are also occurring.

&&

LAT...LON 3439 11950 3440 11954 3442 11956 3445 11955
      3440 11946
TIME...MOT...LOC 0825Z 215DEG 15KT 3438 11954

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...55 MPH

Cohen/Bruno

Special weather statement, Mar 30, 2:17 AM PDT, 1 hour 41 minutes before

Special Weather Statement
National Weather Service OXNARD CA
217 AM PDT Sat Mar 30 2024

CAZ350-352-354-356-301000-
Ventura County Beaches CA-Santa Barbara County Southeastern Coast CA-
Lake Casitas CA-Santa Ynez Mountains Eastern Range CA-
217 AM PDT Sat Mar 30 2024

...STRONG THUNDERSTORMS WILL IMPACT SOUTHWESTERN VENTURA AND
SOUTHEASTERN SANTA BARBARA COUNTIES THROUGH 300 AM PDT...

At 216 AM PDT, Doppler radar was tracking strong thunderstorms along
a line extending from Rincon Point to 11 miles north of Scorpion
Ranch. Movement was northeast at 25 mph.

HAZARD...Wind gusts of 50 to 55 mph and pea size hail. A brief, weak
         tornado cannot be ruled out.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to vegetation is
         possible.

Locations impacted include...
Carpinteria...
La Conchita...
Seacliff...
Lake Casitas...
and Solimar Beach.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3432 11939 3436 11943 3435 11945 3437 11945
      3439 11950 3441 11949 3444 11945 3440 11932
      3431 11935
TIME...MOT...LOC 0916Z 224DEG 24KT 3439 11947 3420 11952

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...55 MPH

Cohen

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 29, 5:30 PM PDT	Areal Flood Advisory	LOX	San Luis Obispo	7 hr
Mar 29, 6:23 PM PDT	Special Marine Warning	LOX		112 min
Mar 29, 7:45 PM PDT	Special Weather Statement	LOX	San Luis Obispo	45 min
Mar 29, 8:15 PM PDT	Special Marine Warning	LOX		2 hr
Mar 29, 8:19 PM PDT	Small Craft Advisory	LOX		55 hr
Mar 29, 8:38 PM PDT	Special Weather Statement	LOX	Santa Barbara	52 min
Mar 29, 9:50 PM PDT	Areal Flood Advisory	LOX	Santa Barbara	4 hr
Mar 29, 10:35 PM PDT	Special Weather Statement	LOX	Santa Barbara	25 min
Mar 29, 10:39 PM PDT	Special Marine Warning	LOX		2 hr
Mar 29, 11:22 PM PDT	Special Weather Statement	LOX	Santa Barbara	53 min
Mar 29, 11:43 PM PDT	Flash Flood Warning	LOX	Santa Barbara	3 hr
Mar 30, 12:23 AM PDT	Flash Flood Warning	LOX	Santa Barbara	4 hr
Mar 30, 12:31 AM PDT	Areal Flood Advisory	LOX	Ventura	6 hr
Mar 30, 1:24 AM PDT	Special Marine Warning	LOX		111 min
Mar 30, 1:25 AM PDT	Special Weather Statement	LOX	Ventura	20 min
Mar 30, 1:28 AM PDT	Tornado Warning	LOX	Santa Barbara	19 min
Mar 30, 2:17 AM PDT	Special Weather Statement	LOX	Ventura	43 min
Mar 30, 2:31 AM PDT	Areal Flood Advisory	LOX	Los Angeles	7 hr
Mar 30, 6:29 AM PDT	Special Weather Statement	LOX	Los Angeles	31 min
Mar 30, 7:20 AM PDT	Special Weather Statement	LOX	Los Angeles	55 min
Mar 30, 7:49 AM PDT	Special Marine Warning	LOX		26 min
Mar 30, 9:25 AM PDT	Areal Flood Advisory	LOX	Los Angeles	95 min
Mar 30, 12:57 PM PDT	Special Marine Warning	LOX		108 min
Mar 30, 1:56 PM PDT	Special Weather Statement	LOX	San Luis Obispo	79 min
Mar 30, 2:14 PM PDT	Wind Advisory	LOX	San Luis Obispo, Santa Barbara	6 hr
Mar 30, 2:49 PM PDT	Special Marine Warning	LOX		116 min
Mar 30, 3:23 PM PDT	Special Weather Statement	LOX	San Luis Obispo, Santa Barbara	52 min
Mar 30, 3:48 PM PDT	Special Marine Warning	LOX		57 min
Mar 30, 4:26 PM PDT	Special Weather Statement	LOX	Santa Barbara	49 min
Mar 30, 4:52 PM PDT	Special Marine Warning	LOX		113 min

Nearby

Flash Flood Warnings in California, 2024 Every flash flood warning in 2024

Sources

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