Alert archive / California / Flash Flood Warnings in 2014

Flash Flood Warning 13, NWS Las Vegas, NV

July 6, 2014San Bernardino County, California; Mohave County, Arizona

NWS Las Vegas, NV issued this flash flood warning at Jul 6, 2014, 4:28 PM PDT for San Bernardino County, California; Mohave County, Arizona. It was in force for 3 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: Jul 6, 2014, 4:28 PM PDT (23:28 UTC)
Expired: Jul 6, 2014, 7:30 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), 139 km from the middle of the area, began a volume at 23:29 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 6, 5:04 PM PDT	FLASH FLOOD	5 W Lake Havasu City, CA	SEVERAL REPORTS ON TWITTER WITH PHOTOS OF FLOODING NEAR A ST AND MAIN ST ON THE CALIFORNIA SIDE OF LAKE HAVASU. SEVERAL TRUCKS STUCK IN ABOUT A FOOT OF FLOWING WATER.

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, 11.5 hours before the alert went out and 232 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: 44 J/kg
Mixed-layer CIN: -341 J/kg
Mixed-layer LCL: 2456 m above ground
0-6 km bulk shear: 3 kt
0-1 km storm-relative helicity: -24 m²/s²
0-3 km storm-relative helicity: -2 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

678 
WGUS55 KVEF 062328
FFWVEF
AZC015-CAC071-070230-
/O.NEW.KVEF.FF.W.0013.140706T2328Z-140707T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
428 PM MST SUN JUL 6 2014

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

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

* UNTIL 730 PM MST/730 PM PDT/

* AT 424 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  FLASH FLOODING FROM A CLUSTER OF STRONG THUNDERSTORMS ALONG THE    
  COLORADO RIVER...THESE STORMS ARE PRODUCING VERY HEAVY RAIN AND    
  FLASH FLOODING AND CONTINUE TO DEVELOP ACROSS THE WARNED AREA.

* LOCATIONS IMPACTED INCLUDE...
  LAKE HAVASU CITY
  DESERT HILLS
  HAVASU LAKE

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FLASH FLOODING IS EXPECTED IN WASHES...LOW WATER CROSSINGS AND ON
ROADS. TO ESCAPE RISING WATER...MOVE TO HIGHER GROUND. NEVER TRY TO
CROSS A FLOODED ROAD OR ENTER A FLOOD CHANNEL. TURN AROUND...DONT
DROWN!

REPORT FLOODING TO THE LAS VEGAS NATIONAL WEATHER SERVICE VIA
FACEBOOK OR TWITTER.

&&

LAT...LON 3438 11442 3450 11449 3471 11454 3473 11427
      3456 11424 3442 11415

$$

OUTLER

1 follow-up statement

705 
WGUS75 KVEF 070133
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
633 PM MST SUN JUL 6 2014

AZC015-CAC071-070142-
/O.CAN.KVEF.FF.W.0013.000000T0000Z-140707T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-SAN BERNARDINO CA-
633 PM MST SUN JUL 6 2014

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR EXTREME EAST 
CENTRAL SAN BERNARDINO AND SOUTHWESTERN MOHAVE COUNTIES. THE 
THUNDERSTORMS PRODUCING THE HEAVY RAIN HAVE MOVED OUT OF THE AREA. 
ADDITIONAL LIGHT SHOWERS ARE POSSIBLE BUT THE THREAT FOR IMMEDIATE 
FLASH FLOODING HAS ENDED...

LAT...LON 3438 11442 3450 11449 3471 11454 3473 11427
      3456 11424 3442 11415

$$

STUMPF

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 5, 5:41 PM PDT	Areal Flood Advisory	VEF	Inyo	79 min
Jul 5, 8:01 PM PDT	Areal Flood Advisory	VEF	San Bernardino	3 hr
Jul 6, 3:22 PM PDT	Flash Flood Warning	VEF	San Bernardino	113 min
Jul 5, 5:34 PM PDT	Areal Flood Advisory	VEF	Mohave	116 min
Jul 6, 12:29 PM PDT	Areal Flood Advisory	VEF	Mohave	3 hr
Jul 6, 1:47 PM PDT	Areal Flood Advisory	VEF	Mohave	3 hr
Jul 6, 3:09 PM PDT	Flash Flood Warning	VEF	Mohave	3 hr

Nearby

Flash Flood Warnings in California, 2014 Flash Flood Warnings in Arizona, 2014 Every flash flood warning in 2014

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.