Alert archive / California / Flash Flood Warnings in 2021
Flash Flood Warning 85, NWS Las Vegas, NV
NWS Las Vegas, NV issued this flash flood warning at Jul 30, 2021, 2:48 PM PDT for San Bernardino County, California. It was in force for 3 hr. 2 reports 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
- Jul 30, 2021, 2:48 PM PDT (21:48 UTC)
- Expired
- Jul 30, 2021, 6:00 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), 127 km from the middle of the area, began a volume at 21:51 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 |
|---|---|---|---|
| Jul 30, 3:49 PM PDT | FLASH FLOOD | 1 Ne Yucca Valley, CA | CHP REPORTS MODERATE FLOODING AT THE INTERSECTION OF CR-62 AND CR-247. |
| Jul 30, 5:45 PM PDT | FLASH FLOOD | 4 E Joshua Tree, CA | CHP REPORTED ROAD FLOODING AT SUNFAIR RD AND SR-62. VEHICLES ARE SLIDING AND GETTING STUCK. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
San Diego, CA (KNKX), launched 12:00Z, 9.8 hours before the alert went out and 178 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
- 2147 m above ground
- 0-6 km bulk shear
- 10 kt
- 0-1 km storm-relative helicity
- -15 m²/s²
- 0-3 km storm-relative helicity
- 37 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
031
WGUS55 KVEF 302148
FFWVEF
CAC071-310100-
/O.NEW.KVEF.FF.W.0085.210730T2148Z-210731T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Las Vegas NV
248 PM PDT Fri Jul 30 2021
The National Weather Service in Las Vegas has issued a
* Flash Flood Warning for...
East Central San Bernardino County in southern California...
* Until 600 PM PDT.
* At 248 PM PDT, Doppler radar indicated thunderstorms producing
heavy rain near Landers with storms building southeast toward
Yucca Valley and Joshua Tree. 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...
Yucca Valley, Joshua Tree and Joshua Tree Lake Campground.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3442 11640 3437 11631 3434 11629 3425 11623
3415 11620 3412 11621 3412 11626 3408 11626
3408 11644 3413 11651 3414 11647 3421 11644
3426 11644 3432 11648 3436 11640
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
BKP2 follow-up statements
896
WGUS75 KVEF 302242
FFSVEF
Flash Flood Statement
National Weather Service Las Vegas NV
342 PM PDT Fri Jul 30 2021
CAC071-310100-
/O.CON.KVEF.FF.W.0085.000000T0000Z-210731T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Bernardino CA-
342 PM PDT Fri Jul 30 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 6 PM PDT THIS EVENING
FOR EAST CENTRAL SAN BERNARDINO COUNTY...
At 342 PM PDT, Doppler radar indicated a line of thunderstorms
producing heavy rain between Landers and Joshua Tree. A storm
spotter in Landers reported around 0.75 inch of rain in 30 minutes.
Flash flooding is ongoing or expected to begin shortly.
HAZARD...Life-threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Radar.
IMPACT...Life-threatening flash flooding of low-water crossings,
creeks, normally dry washes and roads.
Some locations that will experience flash flooding include...
Yucca Valley, Joshua Tree and Joshua Tree Lake Campground.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3442 11640 3437 11631 3434 11629 3425 11623
3415 11620 3412 11621 3412 11626 3408 11626
3408 11644 3413 11651 3414 11647 3421 11644
3426 11644 3432 11648 3436 11640
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
BKP961
WGUS75 KVEF 310056
FFSVEF
Flash Flood Statement
National Weather Service Las Vegas NV
556 PM PDT Fri Jul 30 2021
CAC071-310106-
/O.EXP.KVEF.FF.W.0085.000000T0000Z-210731T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Bernardino CA-
556 PM PDT Fri Jul 30 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 6 PM PDT THIS EVENING FOR EAST
CENTRAL SAN BERNARDINO COUNTY...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
A Flash Flood Watch remains in effect until 500 AM PDT Sunday for a
portion of southeast California.
LAT...LON 3442 11640 3437 11631 3434 11629 3425 11623
3415 11620 3412 11621 3412 11626 3408 11626
3408 11644 3413 11651 3414 11647 3421 11644
3426 11644 3432 11648 3436 11640
$$
BKPThe office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 30, 1:14 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 61 min |
| Jul 30, 2:53 PM PDT | Areal Flood Advisory | VEF | Inyo | 3 hr |
| Jul 30, 3:56 PM PDT | Flash Flood Warning | VEF | Inyo | 5 hr |
| Jul 30, 4:07 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.