Alert archive / California / Flash Flood Warnings in 2021
Flash Flood Warning 80, NWS Las Vegas, NV
NWS Las Vegas, NV issued this flash flood warning at Jul 28, 2021, 1:21 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 28, 2021, 1:21 PM PDT (20:21 UTC)
- Expired
- Jul 28, 2021, 4:00 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 Santa Ana Mts radar (KSOX), 135 km from the middle of the area, began a volume at 20:23 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, 8.4 hours before the alert went out and 175 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
- 1533 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 24 m²/s²
- 0-3 km storm-relative helicity
- 55 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
979
WGUS55 KVEF 282021
FFWVEF
CAC071-282300-
/O.NEW.KVEF.FF.W.0080.210728T2021Z-210728T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Las Vegas NV
121 PM PDT Wed Jul 28 2021
The National Weather Service in Las Vegas has issued a
* Flash Flood Warning for...
San Bernardino County in southern California...
* Until 400 PM PDT.
* At 121 PM PDT, Doppler radar indicated thunderstorms producing
heavy rain south of Joshua Tree. Between 0.75 and 1.5 inches of
rain have fallen. Flash flooding is ongoing or expected to begin
shortly and will impact Park Blvd and Indian Cove Roads south of
Highway 62. Additional flooding may impact Highway 62
between Twentynine Palms and Yucca Valley.
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...
Joshua Tree Lake Campground and Joshua Tree.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3408 11632 3414 11636 3419 11637 3422 11635
3425 11630 3426 11627 3426 11620 3424 11615
3419 11609 3412 11606 3412 11609 3412 11611
3412 11614 3412 11616 3412 11621 3412 11623
3412 11625 3412 11626 3411 11626 3408 11626
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
CO2 follow-up statements
910
WGUS75 KVEF 282125
FFSVEF
Flash Flood Statement
National Weather Service Las Vegas NV
225 PM PDT Wed Jul 28 2021
CAC071-282300-
/O.CON.KVEF.FF.W.0080.000000T0000Z-210728T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Bernardino CA-
225 PM PDT Wed Jul 28 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 4 PM PDT THIS
AFTERNOON FOR SAN BERNARDINO COUNTY...
At 225 PM PDT, Heavy rain has begun to diminish across the Joshua
Tree area. While rain has ended...excessive runoff from earlier
rainfall will continue and will impact Highway 62...especially
between Mantonya Road and Copper Mountain Road. Continue to avoid
flood waters and heed road closures.
HAZARD...Life-threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Radar.
IMPACT...Life-threatening flash flooding of low-water crossings,
creeks, normally dry washes and roads.
Some locations that will experience flash flooding include...
Joshua Tree Lake Campground and Joshua Tree.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3408 11632 3414 11636 3419 11637 3422 11635
3425 11630 3426 11627 3426 11620 3424 11615
3419 11609 3412 11606 3412 11609 3412 11611
3412 11614 3412 11616 3412 11621 3412 11623
3412 11625 3412 11626 3411 11626 3408 11626
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
CO007
WGUS75 KVEF 282250
FFSVEF
Flash Flood Statement
National Weather Service Las Vegas NV
350 PM PDT Wed Jul 28 2021
CAC071-282300-
/O.EXP.KVEF.FF.W.0080.000000T0000Z-210728T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Bernardino CA-
350 PM PDT Wed Jul 28 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 4 PM PDT THIS AFTERNOON FOR
SAN BERNARDINO COUNTY...
Heavy rainfall has ended and flooding is no longer expected to pose
a threat. Please continue to heed remaining road closures.
LAT...LON 3408 11632 3414 11636 3419 11637 3422 11635
3425 11630 3426 11627 3426 11620 3424 11615
3419 11609 3412 11606 3412 11609 3412 11611
3412 11614 3412 11616 3412 11621 3412 11623
3412 11625 3412 11626 3411 11626 3408 11626
$$
COThe office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 27, 5:56 PM PDT | Areal Flood Advisory | VEF | San Bernardino | 2 hr |
| Jul 28, 12:59 PM PDT | Areal Flood Advisory | VEF | San Bernardino | 22 min |
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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.