Alert archive / California / Winter Storm Warnings in 2023
Winter Storm Warning 4, NWS Los Angeles, CA
NWS Los Angeles, CA issued this winter storm warning at Mar 20, 2023, 1:47 PM PDT for Los Angeles County, Santa Barbara County, Ventura County, California. It took effect at Mar 21, 2023, 7:00 AM PDT. It was in force for 40 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 20, 2023, 1:47 PM PDT (20:47 UTC)
- In effect from
- Mar 21, 2023, 7:00 AM PDT
- Expired
- Mar 22, 2023, 11:00 PM PDT
- In force
- 40 hr
- Issued by
- NWS Los Angeles, CA
Counties Los Angeles County, CA, Santa Barbara County, CA, Ventura County, CA
The radar
The Los Angeles radar (KVTX), 6 km from the middle of the area, began a volume at 20:47 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 12:00Z, 8.8 hours before the alert went out and 131 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.
- Mixed-layer CAPE
- 22 J/kg
- Mixed-layer CIN
- 0 J/kg
- Mixed-layer LCL
- 441 m above ground
- 0-6 km bulk shear
- 76 kt
- 0-1 km storm-relative helicity
- -4 m²/s²
- 0-3 km storm-relative helicity
- 57 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this winter storm 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 winter storm warning went out at Mar 20, 1:46 PM PDT, 1 minute earlier.
Area forecast discussion, Mar 20, 1:46 PM PDT, 1 minute before
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</html>The office that day
Everything else NWS Los Angeles, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 20, 2:50 AM PDT | Gale Warning | LOX | 35 hr | |
| Mar 20, 5:00 AM PDT | High Surf Advisory | LOX | Los Angeles, San Luis Obispo, Santa Barbara, Ventura | 3 days |
| Mar 20, 12:27 PM PDT | Flood Watch | LOX | Los Angeles, San Luis Obispo, Santa Barbara, Ventura | 53 hr |
| Mar 20, 1:08 PM PDT | Coastal Flood Advisory | LOX | San Luis Obispo, Santa Barbara, Ventura | 61 hr |
| Mar 20, 1:47 PM PDT | High Wind Warning | LOX | Los Angeles, San Luis Obispo, Santa Barbara | 32 hr |
| Mar 20, 1:47 PM PDT | Wind Advisory | LOX | Los Angeles, San Luis Obispo, Santa Barbara, Ventura | 32 hr |
Nearby
Winter Storm Warnings in California, 2023Every winter storm warning in 2023
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.