Alert archive / California / Flash Flood Warnings in 2017
Flash Flood Warning 91, NWS Las Vegas, NV
NWS Las Vegas, NV issued this flash flood warning at Aug 12, 2017, 1:31 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 12, 2017, 1:31 PM PDT (20:31 UTC)
- Expired
- Aug 12, 2017, 4:30 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 Las Vegas radar (KESX), 134 km from the middle of the area, began a volume at 20:33 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
Las Vegas, NV (KVEF), launched 12:00Z, 8.5 hours before the alert went out and 224 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
- 845 J/kg
- Mixed-layer CIN
- -148 J/kg
- Mixed-layer LCL
- 2429 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 21 m²/s²
- 0-3 km storm-relative helicity
- 13 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
The text
As transmitted.
776
WGUS55 KVEF 122031
FFWVEF
CAC071-122330-
/O.NEW.KVEF.FF.W.0091.170812T2031Z-170812T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Las Vegas NV
131 PM PDT SAT AUG 12 2017
The National Weather Service in Las Vegas has issued a
* Flash Flood Warning for...
Eastern San Bernardino County in southern California...
* Until 430 PM PDT
* At 129 PM PDT, Doppler radar indicated thunderstorms producing
heavy rain across southeastern San Bernardino County. Flash
flooding is expected to begin shortly.
* Some locations that will experience flooding include...
Highway 95 south of mile marker 43.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3432 11468 3453 11491 3470 11472 3465 11444
3462 11444 3461 11443 3460 11443 3459 11444
3456 11440 3431 11451
$$
AA2 follow-up statements
226
WGUS75 KVEF 122158
FFSVEF
Flash Flood Statement
National Weather Service Las Vegas NV
258 PM PDT SAT AUG 12 2017
CAC071-122330-
/O.CON.KVEF.FF.W.0091.000000T0000Z-170812T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Bernardino CA-
258 PM PDT SAT AUG 12 2017
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 430 PM PDT FOR
EASTERN SAN BERNARDINO COUNTY...
At 257 PM PDT, Doppler radar indicated thunderstorms producing heavy
rain across southeastern San Bernardino County. Flash flooding is
expected to begin shortly.
Some locations that will experience flooding include...
Highway 95 south of Mile Marker 35.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3432 11468 3453 11491 3470 11472 3465 11444
3462 11444 3461 11443 3460 11443 3459 11444
3456 11440 3431 11451
$$
AA174
WGUS75 KVEF 122323
FFSVEF
Flash Flood Statement
National Weather Service Las Vegas NV
423 PM PDT SAT AUG 12 2017
CAC071-122333-
/O.EXP.KVEF.FF.W.0091.000000T0000Z-170812T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Bernardino CA-
423 PM PDT SAT AUG 12 2017
...THE FLASH FLOOD WARNING FOR EASTERN SAN BERNARDINO COUNTY WILL
EXPIRE AT 430 PM PDT...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed any remaining road closures.
LAT...LON 3432 11468 3453 11491 3470 11472 3465 11444
3462 11444 3461 11443 3460 11443 3459 11444
3456 11440 3431 11451
$$
AAThe office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 11, 5:32 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.