Alert archive / California / Flash Flood Warnings in 2023

Flash Flood Warning 123, NWS Las Vegas, NV

September 2, 2023Inyo County, San Bernardino County, California; Clark County, Nevada

NWS Las Vegas, NV issued this flash flood warning at Sep 2, 2023, 11:29 AM PDT for Inyo County, San Bernardino County, California; Clark County, Nevada. It was in force for 4 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Sep 2, 2023, 11:29 AM PDT (18:29 UTC)
Expired: Sep 2, 2023, 3:30 PM PDT
In force: 4 hr
Issued by: NWS Las Vegas, NV
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

Counties Inyo County, CA, San Bernardino County, CA, Clark County, NV

The radar

The Las Vegas radar (KESX), 119 km from the middle of the area, began a volume at 18:32 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

Las Vegas, NV (KVEF), launched 12:00Z, 6.5 hours before the alert went out and 83 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 12 J/kg
Mixed-layer CIN: -118 J/kg
Mixed-layer LCL: 801 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 62 m²/s²
0-3 km storm-relative helicity: 131 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Las Vegas, NV wrote its last area forecast discussion before this flash flood warning went out at Sep 2, 8:15 AM PDT, 3 hours 14 minutes earlier.

Area forecast discussion, Sep 2, 8:15 AM PDT, 3 hours 14 minutes before

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The office that day

Everything else NWS Las Vegas, NV issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 1, 5:11 PM PDT	Severe Thunderstorm Warning	VEF	Inyo, San Bernardino	34 min
Sep 1, 5:59 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	76 min
Sep 1, 6:43 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Sep 1, 6:57 PM PDT	Areal Flood Advisory	VEF	San Bernardino	3 hr
Sep 1, 6:57 PM PDT	Flash Flood Warning Considerable damage threat	VEF	Inyo, San Bernardino	9 hr
Sep 1, 8:36 PM PDT	Flash Flood Warning Considerable damage threat	VEF	Inyo	7 hr
Sep 2, 1:06 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	2 hr
Sep 2, 1:16 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	4 hr
Sep 2, 2:40 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	50 min
Sep 2, 3:35 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Sep 2, 4:47 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	4 hr
Sep 1, 5:37 PM PDT	Flash Flood Warning Considerable damage threat	VEF	Clark	8 hr
Sep 1, 5:51 PM PDT	Flash Flood Warning Considerable damage threat	VEF	Clark	69 min
Sep 1, 6:38 PM PDT	Flash Flood Warning Considerable damage threat	VEF	Clark, Nye	7 hr
Sep 1, 7:10 PM PDT	Flash Flood Warning Considerable damage threat	VEF	Clark, Lincoln	3 hr
Sep 2, 1:26 PM PDT	Flash Flood Warning Considerable damage threat	VEF	Clark	4 hr
Sep 2, 1:57 PM PDT	Flash Flood Warning Considerable damage threat	VEF	Clark	3 hr
Sep 2, 2:31 PM PDT	Severe Thunderstorm Warning	VEF	Clark	59 min
Sep 2, 3:57 PM PDT	Flash Flood Warning Considerable damage threat	VEF	Clark	4 hr
Sep 2, 3:08 AM PDT	Areal Flood Advisory	VEF	Mohave	112 min
Sep 2, 12:27 PM PDT	Flash Flood Warning Considerable damage threat	VEF	Mohave	3 hr
Sep 2, 12:56 PM PDT	Flash Flood Warning Considerable damage threat	VEF	Mohave	3 hr
Sep 2, 1:45 PM PDT	Flash Flood Warning Considerable damage threat	VEF	Mohave	6 hr
Sep 2, 2:51 PM PDT	Flash Flood Warning Considerable damage threat	VEF	Mohave	5 hr

Nearby

Flash Flood Warnings in California, 2023 Flash Flood Warnings in Nevada, 2023 Every flash flood warning in 2023

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.