Alert archive / California / Flash Flood Warnings in 2019

Flash Flood Warning 1, NWS Los Angeles, CA

January 5, 2019Ventura County, California

NWS Los Angeles, CA issued this flash flood warning at Jan 5, 2019, 7:14 PM PST for Ventura County, California. It was in force for 2 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: Jan 5, 2019, 7:14 PM PST (03:14 UTC)
Expired: Jan 5, 2019, 9:39 PM PST
In force: 2 hr
Issued by: NWS Los Angeles, CA
Area: Storm-based polygon
Flood severity: None

County Ventura County, CA

The radar

The Los Angeles radar (KVTX), 8 km from the middle of the area, began a volume at 03:16 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

Vandenberg AFB, CA (KVBG), launched 00:00Z, 3.2 hours before the alert went out and 132 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: 983 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 26 m²/s²
0-3 km storm-relative helicity: -116 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 Jan 5, 4:56 PM PST, 2 hours 18 minutes earlier.

Area forecast discussion, Jan 5, 4:56 PM PST, 2 hours 18 minutes before

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In the hours before

Local storm report, Jan 5, 5:19 PM PST, 1 hour 55 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OXNARD CA
519 PM PST SAT JAN 5 2019

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

1127 AM     WATER SPOUT      5 S VENTURA             34.20N 119.27W
01/05/2019                   PZZ650             CA   PUBLIC

            FUNNEL CLOUD SPOTTED OFF THE COAST OF OXNARD/PORT
            HUENEME. FIVE FUNNEL CLOUDS OR WATERSPOUTS SIGHTEED
            BETWEEN 1127 AM PST AND 100 PM PST.

0348 PM     WATER SPOUT      5 S LONG BEACH          33.71N 118.15W
01/05/2019                   PZZ655             CA   LAW ENFORCEMENT

            CABRILLO BEACH LIFEGUARDS SPOTTED THREE WATERSPOUTS OFF
            THE COAST OF LONG BEACH. MULTIPLE SOCIAL MEDIA REPORTS
            BETWEEN 3 PM AND 4 PM PST.

&&

HALL

The office that day

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

Issued	Product	Office	Counties	Lasted
Jan 5, 4:07 PM PST	Special Marine Warning	LOX		23 min
Jan 5, 4:29 PM PST	Special Marine Warning	LOX		31 min
Jan 5, 5:42 PM PST	Special Marine Warning	LOX		33 min
Jan 5, 6:44 PM PST	Areal Flood Advisory	LOX	Ventura	3 hr
Jan 5, 7:34 PM PST	Areal Flood Advisory	LOX	Los Angeles	3 hr
Jan 5, 7:43 PM PST	Flash Flood Warning	LOX	Los Angeles, Ventura	2 hr
Jan 5, 9:40 PM PST	Flash Flood Warning	LOX	Los Angeles	107 min
Jan 5, 10:17 PM PST	Special Marine Warning	LOX		58 min
Jan 6, 1:12 AM PST	Areal Flood Advisory	LOX	Santa Barbara, Ventura	108 min
Jan 6, 2:42 AM PST	Small Craft Advisory for Hazardous Seas	LOX		6 hr
Jan 6, 9:23 AM PST	Small Craft Advisory for Hazardous Seas	LOX		5 hr
Jan 6, 1:49 PM PST	Wind Advisory	LOX		20 hr
Jan 6, 2:13 PM PST	Gale Warning	LOX		13 hr
Jan 6, 2:13 PM PST	Small Craft Advisory	LOX		13 hr

Nearby

Flash Flood Warnings in California, 2019 Every flash flood warning in 2019

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.