Alert archive / California / Flash Flood Warnings in 2021
Flash Flood Warning 120, NWS Las Vegas, NV
NWS Las Vegas, NV issued this flash flood warning at Aug 30, 2021, 1:17 PM PDT for San Bernardino County, California. It was in force for 3 hr. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Aug 30, 2021, 1:17 PM PDT (20:17 UTC)
- Expired
- Aug 30, 2021, 4:15 PM PDT
- In force
- 3 hr
- Issued by
- NWS Las Vegas, NV
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
County San Bernardino County, CA
The radar
The Las Vegas radar (KESX), 48 km from the middle of the area, began a volume at 20:18 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 30, 1:30 PM PDT | FLASH FLOOD | 5 W Nipton, CA | REPORT OF FLASH FLOODING ON NIPTON ROAD EAST OF IVANPAH ROAD. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Las Vegas, NV (KVEF), launched 12:00Z, 8.3 hours before the alert went out and 103 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
- 37 J/kg
- Mixed-layer CIN
- -324 J/kg
- Mixed-layer LCL
- 3297 m above ground
- 0-6 km bulk shear
- 2 kt
- 0-1 km storm-relative helicity
- -27 m²/s²
- 0-3 km storm-relative helicity
- 39 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
876
WGUS55 KVEF 302017
FFWVEF
CAC071-302315-
/O.NEW.KVEF.FF.W.0120.210830T2017Z-210830T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Las Vegas NV
117 PM PDT Mon Aug 30 2021
The National Weather Service in Las Vegas has issued a
* Flash Flood Warning for...
San Bernardino County in southern California...
* Until 415 PM PDT.
* At 117 PM PDT, Doppler radar indicated thunderstorms producing
heavy rain over Nipton Road just west of the Nevada state line.
Flash flooding is ongoing or expected to begin shortly.
HAZARD...Life-threatening flash flooding. Thunderstorms
producing flash flooding.
SOURCE...Radar.
IMPACT...Life-threatening flash flooding of low-water
crossings, creeks, normally dry washes and roads.
* Some locations that will experience flash flooding include...
Nipton and Nipton And Ivanpah Roads.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 3547 11539 3548 11526 3546 11526 3545 11539
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
CM2 follow-up statements
290
WGUS75 KVEF 302205
FFSVEF
Flash Flood Statement
National Weather Service Las Vegas NV
305 PM PDT Mon Aug 30 2021
CAC071-302315-
/O.CON.KVEF.FF.W.0120.000000T0000Z-210830T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Bernardino CA-
305 PM PDT Mon Aug 30 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 415 PM PDT THIS
AFTERNOON FOR SAN BERNARDINO COUNTY...
At 305 PM PDT, California Highway Patrol reported vehicles stuck
along Nipton Road near I-15. Nipton road will remain impassable due
to flooding and debris through late afternoon.
HAZARD...Life-threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Law enforcement reported.
IMPACT...Life-threatening flash flooding of low-water crossings,
normally dry washes and roads.
Some locations that will experience flash flooding include...
Nipton road.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 3547 11539 3548 11526 3546 11526 3545 11539
FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
JA412 WGUS75 KVEF 302310 FFSVEF Flash Flood Statement National Weather Service Las Vegas NV 410 PM PDT Mon Aug 30 2021 CAC071-302320- /O.EXP.KVEF.FF.W.0120.000000T0000Z-210830T2315Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ San Bernardino CA- 410 PM PDT Mon Aug 30 2021 ...FLASH FLOOD WARNING WILL EXPIRE AT 415 PM PDT THIS AFTERNOON FOR NIPTON ROAD IN SAN BERNARDINO COUNTY... Flooding is no longer expected to pose a threat for Nipton Road in eastern San Bernardino county though residual debris may make the road impassible until crews can clear it off. Please continue to heed remaining road closures. LAT...LON 3547 11539 3548 11526 3546 11526 3545 11539 $$ JA
The office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 29, 6:53 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Aug 30, 3:28 AM PDT | Flash Flood Watch | VEF | San Bernardino | 59 hr |
| Aug 30, 2:37 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Aug 30, 2:55 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.