Alert archive / California / Flash Flood Warnings in 2020
Flash Flood Warning 3, NWS Las Vegas, NV
NWS Las Vegas, NV issued this flash flood warning at Mar 12, 2020, 4:07 PM PDT for San Bernardino County, California; Mohave County, Arizona. It was in force for 4 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
- Mar 12, 2020, 4:07 PM PDT (23:07 UTC)
- Expired
- Mar 12, 2020, 8:00 PM PDT
- In force
- 4 hr
- Issued by
- NWS Las Vegas, NV
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
Counties Mohave County, AZ, San Bernardino County, CA
The radar
The Las Vegas radar (KESX), 120 km from the middle of the area, began a volume at 23:11 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 |
|---|---|---|---|
| Mar 12, 7:15 PM PDT | FLASH FLOOD | 1 Wsw Amboy, CA | ROADWAY FLOODED NEAR AMBOY AND NATIONAL TRAILS HWY WITH ROCKS AND DEBRIS ACROSS ROADWAY. |
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, 11.1 hours before the alert went out and 208 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
- 3 J/kg
- Mixed-layer CIN
- -54 J/kg
- Mixed-layer LCL
- 1191 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- -14 m²/s²
- 0-3 km storm-relative helicity
- 81 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
796
WGUS55 KVEF 122307
FFWVEF
AZC015-CAC071-130300-
/O.NEW.KVEF.FF.W.0003.200312T2307Z-200313T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Las Vegas NV
407 PM PDT Thu Mar 12 2020
The National Weather Service in Las Vegas has issued a
* Flash Flood Warning for...
Southwestern Mohave County in northwestern Arizona...
Southeastern San Bernardino County in southern California...
* Until 800 PM PDT/800 PM MST/.
* At 403 PM PDT/403 PM MST/, Doppler radar indicated thunderstorms
producing heavy rain across eastern San Bernardino County and
southwestern Mohave County. Flash flooding is ongoing or expected
to begin shortly.
HAZARD...Life threatening flash flooding. Heavy rain producing
flash flooding.
SOURCE...Radar indicated.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
* Some locations that will experience flooding include...
Lake Havasu City, Highway 95 At Mile Marker 29, Topock, Needles,
Three Dunes Campground, Desert Hills, Black Meadow Landing
Campground, Amboy, Mojave Ranch Estates, Mohave Valley, Highway 95
And I-40, Mesquite Creek, Cattail Cove State Park, Arizona Village,
Essex and Willow Valley.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3426 11458 3424 11513 3456 11578 3501 11547
3516 11503 3507 11472 3501 11465 3505 11463
3497 11436 3467 11425 3428 11415 3419 11423
3416 11429
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
EXPECTED RAINFALL...1-2 INCHES IN 1 HOUR
$$
CK2 follow-up statements
205
WGUS75 KVEF 130015
FFSVEF
Flash Flood Statement
National Weather Service Las Vegas NV
515 PM PDT Thu Mar 12 2020
AZC015-CAC071-130300-
/O.CON.KVEF.FF.W.0003.000000T0000Z-200313T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mohave AZ-San Bernardino CA-
515 PM PDT Thu Mar 12 2020
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 800 PM PDT/800 PM
MST/ FOR SOUTHWESTERN MOHAVE AND SOUTHEASTERN SAN BERNARDINO
COUNTIES...
At 510 PM PDT/510 PM MST/, trained weather spotters reported flash
flooding in Lake Havasu City along London Bridge Rd near Paseo del
Sol Ave. Spotter reports one to one and half feet of fast moving
water moving across the roadway. Flash flooding is ongoing or
expected to begin shortly.
HAZARD...Life threatening flash flooding. Heavy rain producing flash
flooding.
SOURCE...Trained weather spotters.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
Some locations that will experience flooding include...
Lake Havasu City, Highway 95 At Mile Marker 29, Topock, Needles,
Three Dunes Campground, Desert Hills, Black Meadow Landing
Campground, Amboy, Mojave Ranch Estates, Mohave Valley, Highway 95
And I-40, Mesquite Creek, Cattail Cove State Park, Arizona Village,
Essex and Willow Valley.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3426 11458 3424 11513 3456 11578 3501 11547
3516 11503 3507 11472 3501 11465 3505 11463
3497 11436 3467 11425 3428 11415 3419 11423
3416 11429
FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
EXPECTED RAINFALL...1-2 INCHES IN 1 HOUR
$$
CK140
WGUS75 KVEF 130257
FFSVEF
Flash Flood Statement
National Weather Service Las Vegas NV
757 PM PDT Thu Mar 12 2020
AZC015-CAC071-130303-
/O.EXP.KVEF.FF.W.0003.000000T0000Z-200313T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mohave AZ-San Bernardino CA-
757 PM PDT Thu Mar 12 2020
...THE FLASH FLOOD WARNING FOR SOUTHWESTERN MOHAVE AND SOUTHEASTERN
SAN BERNARDINO COUNTIES WILL EXPIRE AT 800 PM PDT/800 PM MST/...
The heavy rain has ended. Additional flooding is no longer expected
to pose a threat. Significant ponding of water and rapidly running
washes will continue overnight. Please continue to heed any
remaining road closures.
LAT...LON 3426 11458 3424 11513 3456 11578 3501 11547
3516 11503 3507 11472 3501 11465 3505 11463
3497 11436 3467 11425 3428 11415 3419 11423
3416 11429
$$
SCThe office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 12, 2:54 PM PDT | Flash Flood Warning | VEF | San Bernardino | 2 hr |
| Mar 12, 3:26 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Mar 12, 4:32 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
Nearby
Flash Flood Warnings in California, 2020Flash Flood Warnings in Arizona, 2020Every flash flood warning in 2020
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.