Alert archive / California / Flash Flood Warnings in 2021
Flash Flood Warning 68, NWS Las Vegas, NV
NWS Las Vegas, NV issued this flash flood warning at Jul 26, 2021, 8:12 AM 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 26, 2021, 8:12 AM PDT (15:12 UTC)
- Expired
- Jul 26, 2021, 11:15 AM 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 nearest sounding before it
Las Vegas, NV (KVEF), launched 12:00Z, 3.2 hours before the alert went out and 155 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
- 467 J/kg
- Mixed-layer CIN
- -144 J/kg
- Mixed-layer LCL
- 1095 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- -37 m²/s²
- 0-3 km storm-relative helicity
- 35 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
The text
As transmitted.
231
WGUS55 KVEF 261512
FFWVEF
CAC071-261815-
/O.NEW.KVEF.FF.W.0068.210726T1512Z-210726T1815Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Las Vegas NV
812 AM PDT Mon Jul 26 2021
The National Weather Service in Las Vegas has issued a
* Flash Flood Warning for...
San Bernardino County in southern California...
* Until 1115 AM PDT.
* At 812 AM PDT, Doppler radar indicated thunderstorms producing
heavy rain near Kelbaker Rd south of Kelso. Between 0.5 and 1 inch
of rain has fallen and up to an an additional inch is possible.
Flash flooding is ongoing or expected to begin shortly and roads
may become impassable.
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...
Kelso and Mitchell Caverns.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
In hilly terrain there are hundreds of low water crossings which are
potentially dangerous in heavy rain. Do not attempt to cross flooded
roads. Find an alternate route.
Please report observed flooding to local emergency services or law
enforcement and request they pass this information to the National
Weather Service when you can do so safely.
&&
LAT...LON 3519 11552 3514 11545 3508 11549 3505 11550
3495 11548 3491 11546 3486 11545 3481 11547
3478 11551 3475 11557 3475 11566 3478 11575
3486 11581 3492 11582 3504 11578 3511 11573
3515 11569 3518 11562 3520 11556
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
CO2 follow-up statements
712
WGUS75 KVEF 261648
FFSVEF
Flash Flood Statement
National Weather Service Las Vegas NV
948 AM PDT Mon Jul 26 2021
CAC071-261815-
/O.CON.KVEF.FF.W.0068.000000T0000Z-210726T1815Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Bernardino CA-
948 AM PDT Mon Jul 26 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1115 AM PDT THIS
MORNING FOR SAN BERNARDINO COUNTY...
At 948 AM PDT, Thunderstorm activity has begun lifting northward
however light to moderate rain and continued runoff is occuring.
Area washes and drainages remain elevated and flooded roadways
remain likely on Kelbaker road.
HAZARD...Life-threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Radar.
IMPACT...Life-threatening flash flooding of low-water crossings,
creeks, normally dry washes and roads.
Some locations that will experience flash flooding include...
Kelso and Mitchell Caverns.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
In hilly terrain there are hundreds of low water crossings which are
potentially dangerous in heavy rain. Do not attempt to cross flooded
roads. Find an alternate route.
Please report observed flooding to local emergency services or law
enforcement and request they pass this information to the National
Weather Service when you can do so safely.
&&
LAT...LON 3519 11552 3514 11545 3508 11549 3505 11550
3495 11548 3491 11546 3486 11545 3481 11547
3478 11551 3475 11557 3475 11566 3478 11575
3486 11581 3492 11582 3504 11578 3511 11573
3515 11569 3518 11562 3520 11556
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
CO462
WGUS75 KVEF 261808
FFSVEF
Flash Flood Statement
National Weather Service Las Vegas NV
1108 AM PDT Mon Jul 26 2021
CAC071-261818-
/O.EXP.KVEF.FF.W.0068.000000T0000Z-210726T1815Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Bernardino CA-
1108 AM PDT Mon Jul 26 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 1115 AM PDT THIS MORNING FOR
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 1100 PM PDT Monday for
portions of southeast California and southern Nevada.
LAT...LON 3519 11552 3514 11545 3508 11549 3505 11550
3495 11548 3491 11546 3486 11545 3481 11547
3478 11551 3475 11557 3475 11566 3478 11575
3486 11581 3492 11582 3504 11578 3511 11573
3515 11569 3518 11562 3520 11556
$$
COThe office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 25, 6:59 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Jul 25, 9:55 PM PDT | Severe Thunderstorm Warning | VEF | Inyo, San Bernardino | 50 min |
| Jul 25, 11:13 PM PDT | Flash Flood Warning | VEF | Inyo, San Bernardino | 3 hr |
| Jul 26, 7:59 AM PDT | Areal Flood Advisory | VEF | San Bernardino | 3 hr |
| Jul 26, 9:26 AM PDT | Areal Flood Advisory | VEF | San Bernardino | 3 hr |
| Jul 26, 10:44 AM PDT | Flash Flood Warning | VEF | Inyo, San Bernardino | 3 hr |
| Jul 26, 11:36 AM PDT | Flash Flood Warning | VEF | Inyo, San Bernardino | 3 hr |
| Jul 26, 12:29 PM PDT | Flash Flood Warning | VEF | Inyo | 3 hr |
| Jul 26, 12:51 PM PDT | Flash Flood Warning | VEF | Inyo, San Bernardino | 3 hr |
| Jul 26, 1:12 PM PDT | Flash Flood Warning | VEF | Inyo | 4 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; the sounding from the Mesonet's radiosonde archive.