Alert archive / California / Flash Flood Warnings in 2021
Flash Flood Warning 2, NWS Los Angeles, CA
NWS Los Angeles, CA issued this flash flood warning at Jan 28, 2021, 1:34 AM PST for San Luis Obispo County, California. It was in force for 56 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jan 28, 2021, 1:34 AM PST (09:34 UTC)
- Expired
- Jan 28, 2021, 2:30 AM PST
- In force
- 56 min
- Issued by
- NWS Los Angeles, CA
- Area
- Storm-based polygon
- Flood severity
- None
County San Luis Obispo County, CA
The radar
The Vandenberg AFB radar (KVBX), 57 km from the middle of the area, began a volume at 09:34 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, 9.6 hours before the alert went out and 61 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
- 8 J/kg
- Mixed-layer CIN
- -67 J/kg
- Mixed-layer LCL
- 489 m above ground
- 0-6 km bulk shear
- 77 kt
- 0-1 km storm-relative helicity
- 628 m²/s²
- 0-3 km storm-relative helicity
- 730 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
050
WGUS56 KLOX 280934
FFWLOX
CAC079-281030-
/O.NEW.KLOX.FF.W.0002.210128T0934Z-210128T1030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Los Angeles/Oxnard CA
134 AM PST Thu Jan 28 2021
The National Weather Service in Los Angeles/Oxnard has issued a
* Flash Flood Warning for...
Central San Luis Obispo County in southwestern California...
* Until 230 AM PST.
* At 134 AM PST, Doppler radar and automated rain gauges indicated
heavy rain falling across the warned area. Flash flooding is
ongoing or expected to begin shortly.
HAZARD...Flash flooding caused by heavy rain.
SOURCE...Radar and automated gauges.
IMPACT...Flash flooding of small creeks and streams, urban
areas, highways, streets and underpasses as well as
other poor drainage and low-lying areas.
* Some locations that will experience flash flooding include...
San Luis Obispo, Morro Bay, Avila Beach including the Avila Burn
Scar, Shell Beach, Baywood-Los Osos, Diablo Canyon, Highway 101
over Cuesta Grade and Santa Margarita.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3513 12086 3513 12087 3514 12088 3514 12089
3515 12091 3515 12092 3515 12093 3517 12094
3536 12088 3536 12086 3540 12062 3519 12052
FLASH FLOOD...RADAR AND GAUGE INDICATED
$$
Kaplan/Bruno1 follow-up statement
408
WGUS76 KLOX 281034
FFSLOX
Flash Flood Statement
National Weather Service Los Angeles/Oxnard CA
234 AM PST Thu Jan 28 2021
CAC079-281044-
/O.EXP.KLOX.FF.W.0002.000000T0000Z-210128T1030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Luis Obispo CA-
234 AM PST Thu Jan 28 2021
...FLASH FLOOD WARNING HAS EXPIRED FOR CENTRAL SAN LUIS OBISPO
COUNTY...
Moderate rainfall will continue across the area this morning. Some
heavier rain off the coast will likely move onshore, and additional
flash flood warnings may be needed.
A Flash Flood Watch remains in effect until 1000 PM PST Thursday for
a portion of southwest California.
LAT...LON 3513 12086 3513 12087 3514 12088 3514 12089
3515 12091 3515 12092 3515 12093 3517 12094
3536 12088 3536 12086 3540 12062 3519 12052
$$
DBThe office that day
Everything else NWS Los Angeles, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 27, 11:48 PM PST | Areal Flood Advisory | LOX | San Luis Obispo | 10 hr |
| Jan 28, 12:02 AM PST | Flash Flood Warning | LOX | San Luis Obispo | 4 hr |
| Jan 28, 3:01 AM PST | Flash Flood Warning | LOX | San Luis Obispo | 104 min |
| Jan 28, 5:49 AM PST | Areal Flood Advisory | LOX | Santa Barbara | 8 hr |
| Jan 28, 1:03 PM PST | Areal Flood Advisory | LOX | Santa Barbara | 6 hr |
| Jan 28, 2:16 PM PST | Small Craft Advisory | LOX | 7 hr |
Nearby
Flash Flood Warnings in California, 2021Every flash flood warning in 2021
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.