Alert archive / California / Flash Flood Warnings in 2017
Flash Flood Warning 21, NWS Los Angeles, CA
NWS Los Angeles, CA issued this flash flood warning at Sep 3, 2017, 3:15 PM PDT 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 outline as issued.
The facts
- Issued
- Sep 3, 2017, 3:15 PM PDT (22:15 UTC)
- Expired
- Sep 3, 2017, 6:15 PM PDT
- 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 Edwards AFB radar (KEYX), 68 km from the middle of the area, began a volume at 22:17 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, 10.3 hours before the alert went out and 219 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
- 108 J/kg
- Mixed-layer CIN
- -184 J/kg
- Mixed-layer LCL
- 1874 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- -28 m²/s²
- 0-3 km storm-relative helicity
- 5 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
995
WGUS56 KLOX 032215
FFWLOX
CAC037-040115-
/O.NEW.KLOX.FF.W.0021.170903T2215Z-170904T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service OXNARD CA
315 PM PDT SUN SEP 3 2017
The National Weather Service in OXNARD has issued a
* Flash Flood Warning for...
the Antelope Valley in Northeastern Los Angeles County in
southwestern California...
* Until 615 PM PDT
* At 309 PM PDT, Doppler radar indicated a line of strong
thunderstorms over the eastern Antelope Valley, training
from Lake Los Angeles to Palmdale. Estimated rainfall rates
up to one inch per hour have been observed.
* Some locations that will experience flooding include...
Lake Los Angeles...Lancaster...Palmdale...Highway 14...
and Saddleback Butte State Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3455 11824 3462 11834 3472 11816 3479 11767
3458 11767
$$
Gomberg/Bruno2 follow-up statements
886
WGUS76 KLOX 032254
FFSLOX
Flash Flood Statement
National Weather Service OXNARD CA
354 PM PDT SUN SEP 3 2017
CAC037-040115-
/O.CON.KLOX.FF.W.0021.000000T0000Z-170904T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Los Angeles CA-
354 PM PDT SUN SEP 3 2017
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 615 PM PDT FOR
THE ANTELOPE VALLEY IN NORTHEASTERN LOS ANGELES COUNTY...
At 347 PM PDT, Doppler radar indicated the focus of heaviest rainfall has
shifted northward on a line extending from Saddleback Butte to Lancaster.
Radar has estimated rainfall rates up to one inch per hour with this
storm. In addition, there have been reports of wind gusts with 50 to
60 mph with this storm, which has produced downed power lines near
Lancaster.
Some locations that could experience flooding include...
Lake Los Angeles, Lancaster, and Saddleback Butte State Park, as well
as portions of Highway 14.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3455 11824 3462 11834 3472 11816 3479 11767
3458 11767
$$
Gomberg/Hall296
WGUS76 KLOX 040112
FFSLOX
Flash Flood Statement
National Weather Service OXNARD CA
612 PM PDT SUN SEP 3 2017
CAC037-040120-
/O.EXP.KLOX.FF.W.0021.000000T0000Z-170904T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Los Angeles CA-
612 PM PDT SUN SEP 3 2017
...THE FLASH FLOOD WARNING FOR THE ANTELOPE VALLEY IN NORTHEASTERN
LOS ANGELES COUNTY WILL
EXPIRE AT 615 PM PDT...
The heavy rain has ended, and flooding is no longer expected to pose
an immediate threat. A Flash Flood Watch remains in effect through 10 pm
as there is still the potential for additional thunderstorms through
the evening hours.
LAT...LON 3455 11824 3462 11834 3472 11816 3479 11767
3458 11767
$$
GombergThe office that day
Everything else NWS Los Angeles, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 2, 9:34 PM PDT | Wind Advisory | LOX | 24 hr | |
| Sep 3, 6:13 AM PDT | Small Craft Advisory | LOX | 8 hr | |
| Sep 3, 12:01 PM PDT | Special Weather Statement | LOX | Los Angeles | 59 min |
| Sep 3, 1:07 PM PDT | Flash Flood Watch | LOX | Los Angeles | 8 hr |
| Sep 3, 1:31 PM PDT | Special Weather Statement | LOX | Ventura | 44 min |
| Sep 3, 2:08 PM PDT | Flash Flood Warning | LOX | Santa Barbara, Ventura | 2 hr |
| Sep 3, 2:38 PM PDT | Special Weather Statement | LOX | Santa Barbara | 52 min |
| Sep 3, 2:55 PM PDT | Special Weather Statement | LOX | 80 min | |
| Sep 3, 2:59 PM PDT | Special Marine Warning | LOX | 46 min | |
| Sep 3, 3:38 PM PDT | Severe Thunderstorm Warning | LOX | San Luis Obispo, Santa Barbara | 52 min |
| Sep 3, 3:58 PM PDT | Flash Flood Warning | LOX | San Luis Obispo, Santa Barbara | 4 hr |
| Sep 3, 3:58 PM PDT | Special Weather Statement | LOX | Santa Barbara | 62 min |
| Sep 3, 4:09 PM PDT | Special Marine Warning | LOX | 66 min |
Nearby
Flash Flood Warnings in California, 2017Every flash flood warning in 2017
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.