Alert archive / California / Flash Flood Warnings in 2016

Flash Flood Warning 106, NWS Las Vegas, NV

August 22, 2016San Bernardino County, California; Mohave County, Arizona

NWS Las Vegas, NV issued this flash flood warning at Aug 22, 2016, 8:46 PM PDT for San Bernardino County, California; Mohave County, Arizona. 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
Aug 22, 2016, 8:46 PM PDT (03:46 UTC)
Expired
Aug 22, 2016, 11:45 PM PDT
In force
3 hr
Issued by
NWS Las Vegas, NV
Area
Storm-based polygon
Flood severity
None

Counties Mohave County, AZ, San Bernardino County, CA

The radar

The Las Vegas radar (KESX), 108 km from the middle of the area, began a volume at 03:45 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 00:00Z, 3.8 hours before the alert went out and 194 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-pSkew-T log-p diagram, Las Vegas, NV at 00:00Z on 2016-08-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 472 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Las Vegas, NV at 00:00Z on 2016-08-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 17 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
472 J/kg
Mixed-layer CIN
-11 J/kg
Mixed-layer LCL
3384 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
17 m²/s²
0-3 km storm-relative helicity
99 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

927 
WGUS55 KVEF 230346
FFWVEF
AZC015-CAC071-230645-
/O.NEW.KVEF.FF.W.0106.160823T0346Z-160823T0645Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
846 PM PDT MON AUG 22 2016

THE NATIONAL WEATHER SERVICE IN LAS VEGAS  HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHWESTERN MOHAVE COUNTY IN NORTHWESTERN ARIZONA...
  EAST CENTRAL SAN BERNARDINO COUNTY IN SOUTHERN CALIFORNIA...

* UNTIL 1145 PM PDT/1145 PM MST/

* AT 843 PM PDT/843 PM MST/...DOPPLER RADAR CONTINUED TO INDICATE
  THUNDERSTORMS PRODUCING HEAVY RAIN FROM NEEDLES TO TOPOCK AND
  HIGHWAY 95 NEAR AND SOUTH OF NEEDLES. FLASH FLOODING IS EXPECTED
  TO CONTINUE. THIS WARNING REPLACES AN AREA COVERED IN A PREVIOUS
  WARNING.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  TOPOCK AND NEEDLES. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TURN AROUND...DON'T DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING.

&&

LAT...LON 3485 11509 3483 11420 3458 11442 3457 11522

$$

JS
1 follow-up statement
579 
WGUS75 KVEF 230644
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
1144 PM PDT MON AUG 22 2016

AZC015-CAC071-230651-
/O.EXP.KVEF.FF.W.0106.000000T0000Z-160823T0645Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-SAN BERNARDINO CA-
1144 PM PDT MON AUG 22 2016

...THE FLASH FLOOD WARNING FOR SOUTHWESTERN MOHAVE AND EAST CENTRAL
SAN BERNARDINO COUNTIES WILL EXPIRE AT 1145 PM PDT/1145 PM MST/...

THE HEAVY RAIN HAS TAPERED OFF TO LIGHT OR MODERATE SHOWERS OVER THE
AREA FROM ESSEX TO NEEDLES AND TOPOCK. FLOODING IS NO LONGER
EXPECTED TO POSE A THREAT. PLEASE CONTINUE TO HEED ANY REMAINING
ROAD CLOSURES.

LAT...LON 3485 11509 3483 11420 3458 11442 3457 11522

$$

JA

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 22, 5:45 PM PDTFlash Flood WarningVEFSan Bernardino3 hr
Aug 22, 6:20 PM PDTFlash Flood WarningVEFSan Bernardino3 hr
Aug 22, 8:31 PM PDTFlash Flood WarningVEFSan Bernardino3 hr
Aug 22, 9:44 PM PDTAreal Flood AdvisoryVEFSan Bernardino3 hr
Aug 22, 5:03 PM PDTFlash Flood WarningVEFMohave6 hr
Aug 22, 8:19 PM PDTSevere Thunderstorm WarningVEFMohave41 min
Aug 22, 8:22 PM PDTFlash Flood WarningVEFMohave3 hr
Aug 22, 8:54 PM PDTSevere Thunderstorm WarningVEFMohave51 min
Aug 22, 9:42 PM PDTSevere Thunderstorm WarningVEFMohave33 min
Aug 22, 9:58 PM PDTFlash Flood WarningVEFMohave3 hr
Aug 22, 10:58 PM PDTAreal Flood AdvisoryVEFMohave3 hr
Aug 22, 11:00 PM PDTAreal Flood WarningVEFMohave24 hr
Aug 22, 11:16 PM PDTAreal Flood AdvisoryVEFMohave119 min

Nearby

Flash Flood Warnings in California, 2016Flash Flood Warnings in Arizona, 2016Every flash flood warning in 2016

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.