Alert archive / California / Flash Flood Warnings in 2017
Flash Flood Warning 46, NWS Las Vegas, NV
NWS Las Vegas, NV issued this flash flood warning at Jul 25, 2017, 1:28 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
- Jul 25, 2017, 1:28 PM PDT (20:28 UTC)
- Expired
- Jul 25, 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), 86 km from the middle of the area, began a volume at 20:31 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 123 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
- 916 J/kg
- Mixed-layer CIN
- -51 J/kg
- Mixed-layer LCL
- 897 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 149 m²/s²
- 0-3 km storm-relative helicity
- 167 m²/s²
- Significant tornado parameter
- 0.5
- Supercell composite
- 3.2
The text
As transmitted.
475
WGUS55 KVEF 252028
FFWVEF
CAC071-252330-
/O.NEW.KVEF.FF.W.0046.170725T2028Z-170725T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Las Vegas NV
128 PM PDT TUE JUL 25 2017
The National Weather Service in Las Vegas has issued a
* Flash Flood Warning for...
Central San Bernardino County in southern California...
* Until 430 PM PDT
* At 125 PM PDT, Doppler radar indicated thunderstorms producing
heavy rain across northern portions of the Mojave Preserve.
Thunderstorms will likely develop and spread farther southwestward
over time.
* Some locations that will experience flooding include...
Cima Road and Mountain Pass. Kelbaker Road is likely to experience
flooding in the next three hours as well with additional
thunderstorm activity.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Remain alert for flooding even in locations not receiving rain.
Arroyos, streams, and rivers can become raging killer currents in a
matter of minutes, even from distant rainfall.
&&
LAT...LON 3526 11607 3540 11578 3548 11563 3549 11546
3561 11539 3552 11529 3527 11555 3474 11556
3474 11606
$$
STEELE2 follow-up statements
299
WGUS75 KVEF 252232
FFSVEF
Flash Flood Statement
National Weather Service Las Vegas NV
332 PM PDT TUE JUL 25 2017
CAC071-252330-
/O.CON.KVEF.FF.W.0046.000000T0000Z-170725T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Bernardino CA-
332 PM PDT TUE JUL 25 2017
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 430 PM PDT FOR
CENTRAL SAN BERNARDINO COUNTY...
At 330 PM PDT, Doppler radar indicated thunderstorms producing heavy
rain developing near Kelso. Flash flooding is expected to begin in
that shortly. Flooding is likely ongoing further north near Ivanpah
due to runoff from previous storms.
Some locations that will experience flooding include...
Kelso, Mountain Pass and Nipton And Ivanpah Roads, Kelso Cima Road,
Cima Road, and Morningstar Mine Road.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Remain alert for flooding even in locations not receiving rain.
Arroyos, streams, and rivers can become raging killer currents in a
matter of minutes, even from distant rainfall.
&&
LAT...LON 3526 11607 3540 11578 3548 11563 3549 11546
3561 11539 3552 11529 3527 11555 3474 11556
3474 11606
$$
STEELE298
WGUS75 KVEF 252308
FFSVEF
Flash Flood Statement
National Weather Service Las Vegas NV
408 PM PDT TUE JUL 25 2017
CAC071-252317-
/O.CAN.KVEF.FF.W.0046.000000T0000Z-170725T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Bernardino CA-
408 PM PDT TUE JUL 25 2017
...THE FLASH FLOOD WARNING FOR CENTRAL SAN BERNARDINO COUNTY IS
CANCELLED...
This warning has been replaced by a new warning valid until 7 PM.
Heavy rain poses a threat for flooding near Kelso and Amboy, as well
as on Highway 127 north of Baker.
LAT...LON 3526 11607 3540 11578 3548 11563 3549 11546
3561 11539 3552 11529 3527 11555 3474 11556
3474 11606
$$
MorganThe office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 24, 6:30 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Jul 24, 6:54 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Jul 24, 7:40 PM PDT | Flash Flood Warning | VEF | San Bernardino | 2 hr |
| Jul 24, 11:59 PM PDT | Flash Flood Watch | VEF | San Bernardino | 20 hr |
| Jul 25, 11:06 AM PDT | Flash Flood Warning | VEF | San Bernardino | 6 hr |
| Jul 25, 11:39 AM PDT | Flash Flood Warning | VEF | Inyo | 3 hr |
| Jul 25, 4:07 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.