Alert archive / California / Flash Flood Warnings in 2010
Flash Flood Warning 28, NWS Los Angeles, CA
NWS Los Angeles, CA issued this flash flood warning at Dec 22, 2010, 12:13 PM PST for Los Angeles County, California. It was in force for 3 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
- Dec 22, 2010, 12:13 PM PST (20:13 UTC)
- Expired
- Dec 22, 2010, 3:15 PM PST
- In force
- 3 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 20:15 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 12:00Z, 8.2 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.
- Mixed-layer CAPE
- 23 J/kg
- Mixed-layer CIN
- -39 J/kg
- Mixed-layer LCL
- 511 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 409 m²/s²
- 0-3 km storm-relative helicity
- 432 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 Dec 21, 2:10 PM PST, 22 hours 3 minutes earlier.
Area forecast discussion, Dec 21, 2:10 PM PST, 22 hours 3 minutes 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 |
|---|---|---|---|---|
| Dec 21, 8:04 PM PST | Areal Flood Advisory | LOX | Los Angeles | 3 hr |
| Dec 21, 10:50 PM PST | Special Marine Warning | LOX | 25 min | |
| Dec 21, 10:53 PM PST | Areal Flood Advisory | LOX | Ventura | 8 hr |
| Dec 21, 10:58 PM PST | Areal Flood Advisory | LOX | Los Angeles, Ventura | 8 hr |
| Dec 21, 11:18 PM PST | Special Marine Warning | LOX | 26 min | |
| Dec 22, 12:32 AM PST | Special Marine Warning | LOX | 28 min | |
| Dec 22, 1:00 AM PST | Special Marine Warning | LOX | 10 min | |
| Dec 22, 2:30 AM PST | Small Craft Advisory | LOX | 18 hr | |
| Dec 22, 2:32 AM PST | Areal Flood Advisory | LOX | Santa Barbara | 6 hr |
| Dec 22, 7:11 AM PST | Areal Flood Advisory | LOX | Los Angeles | 6 hr |
| Dec 22, 7:38 AM PST | Areal Flood Advisory | LOX | San Luis Obispo | 6 hr |
| Dec 22, 8:15 AM PST | Areal Flood Advisory | LOX | Santa Barbara | 4 hr |
| Dec 22, 10:34 AM PST | Areal Flood Advisory | LOX | Ventura | 4 hr |
| Dec 22, 11:22 AM PST | Flash Flood Warning | LOX | Los Angeles | 7 hr |
| Dec 22, 1:13 PM PST | Areal Flood Advisory | LOX | Los Angeles | 4 hr |
| Dec 22, 1:26 PM PST | Special Marine Warning | LOX | 49 min | |
| Dec 22, 2:09 PM PST | Flash Flood Warning | LOX | Los Angeles | 4 hr |
| Dec 22, 2:43 PM PST | Areal Flood Advisory | LOX | Los Angeles | 6 hr |
Nearby
Flash Flood Warnings in California, 2010Every flash flood warning in 2010
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.