Alert archive / California / Flash Flood Warnings in 2017
Flash Flood Warning 88, NWS Las Vegas, NV
NWS Las Vegas, NV issued this flash flood warning at Aug 11, 2017, 2:47 PM PDT for San Bernardino 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
- Aug 11, 2017, 2:47 PM PDT (21:47 UTC)
- Expired
- Aug 11, 2017, 5:45 PM PDT
- In force
- 3 hr
- Issued by
- NWS Las Vegas, NV
- Area
- Storm-based polygon
- Flood severity
- None
County San Bernardino County, CA
The radar
The Santa Ana Mts radar (KSOX), 127 km from the middle of the area, began a volume at 21:48 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, 9.8 hours before the alert went out and 181 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1427 m above ground
- 0-6 km bulk shear
- 11 kt
- 0-1 km storm-relative helicity
- -7 m²/s²
- 0-3 km storm-relative helicity
- -12 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
284
WGUS55 KVEF 112147
FFWVEF
CAC071-120045-
/O.NEW.KVEF.FF.W.0088.170811T2147Z-170812T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Las Vegas NV
247 PM PDT FRI AUG 11 2017
The National Weather Service in Las Vegas has issued a
* Flash Flood Warning for...
Southern San Bernardino County in southern California...
* Until 545 PM PDT
* At 244 PM PDT, Doppler radar indicated thunderstorms producing
heavy rain through Homestead Valley. Flash flooding is expected to
begin shortly.
* Some locations that will experience flooding include...
Surprise Valley and Landers.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3418 11645 3421 11644 3426 11644 3432 11648
3436 11641 3441 11640 3443 11614 3415 11613
$$
AA2 follow-up statements
370
WGUS75 KVEF 112332
FFSVEF
Flash Flood Statement
National Weather Service Las Vegas NV
432 PM PDT FRI AUG 11 2017
CAC071-120045-
/O.CON.KVEF.FF.W.0088.000000T0000Z-170812T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Bernardino CA-
432 PM PDT FRI AUG 11 2017
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 545 PM PDT FOR
SOUTHERN SAN BERNARDINO COUNTY...
At 431 PM PDT, Doppler radar indicated moderate to heavy rain near
Landers and Joshua Tree. Flash flooding is likely occurring near
these areas.
Some locations that will experience flooding include...
Joshua Tree Lake Campground.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3418 11645 3421 11644 3426 11644 3432 11648
3436 11641 3441 11640 3443 11614 3415 11613
$$460
WGUS75 KVEF 120045
FFSVEF
Flash Flood Statement
National Weather Service Las Vegas NV
545 PM PDT FRI AUG 11 2017
CAC071-120055-
/O.EXP.KVEF.FF.W.0088.000000T0000Z-170812T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Bernardino CA-
545 PM PDT FRI AUG 11 2017
...THE FLASH FLOOD WARNING FOR SOUTHERN SAN BERNARDINO COUNTY HAS
EXPIRED...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed any remaining road closures.
LAT...LON 3418 11645 3421 11644 3426 11644 3432 11648
3436 11641 3441 11640 3443 11614 3415 11613
$$
ASGThe office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 11, 1:56 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Aug 11, 2:42 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 48 min |
| Aug 11, 3:51 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
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.