Alert archive / Arizona / Flash Flood Warnings in 2011

Flash Flood Warning 23, NWS Las Vegas, NV

July 5, 2011Mohave County, Arizona; San Bernardino County, California

NWS Las Vegas, NV issued this flash flood warning at Jul 5, 2011, 11:49 PM MST for Mohave County, Arizona; San Bernardino County, California. It was in force for 116 min. 5 reports 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 5, 2011, 11:49 PM MST (06:49 UTC)
Expired: Jul 6, 2011, 1:45 AM MST
In force: 116 min
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), 165 km from the middle of the area, began a volume at 06:53 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, 12:33 AM MST	FLASH FLOOD	Lake Havasu City, AZ	THE LAKE HAVASU CITY POLICE DEPARTMENT REPORTED WATER UP TO THE BOTTOM OF CARS ON ROADS THAT WAS AT LEAST 6 INCHES DEEP. IN ADDITION ONE CAR WAS STALLED IN FLOODWATERS.
Jul 6, 1:15 AM MST	HEAVY RAIN 0	11 Ne Lake Havasu City, AZ	REMOTE RAIN GAGE...CROSSMAN PEAK...REPORTED 1.73 INCHES OF RAIN DURING THE PAST TWO HOURS ENDING AT 0115 AM MST.
Jul 6, 1:15 AM MST	HEAVY RAIN 0	4 Nne Lake Havasu (C576, AZ	REMOTE RAIN GAGE...PITTSBURG MINE...REPORTED 1.42 INCHES OF RAIN DURING THE PAST TWO HOURS ENDING AT 0115 AM MST.
Jul 6, 1:15 AM MST	HEAVY RAIN 1.42	4 Nne Lake Havasu (C576, AZ	REMOTE RAIN GAGE...PITTSBURG MINE...REPORTED 1.42 INCHES OF RAIN DURING THE PAST TWO HOURS ENDING AT 0115 AM MST.
Jul 6, 1:15 AM MST	HEAVY RAIN 1.73	11 Ne Lake Havasu City, AZ	REMOTE RAIN GAGE...CROSSMAN PEAK...REPORTED 1.73 INCHES OF RAIN DURING THE PAST TWO HOURS ENDING AT 0115 AM MST.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Phoenix, AZ (KPSR), launched 00:00Z, 6.8 hours before the alert went out and 226 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: 608 J/kg
Mixed-layer CIN: -118 J/kg
Mixed-layer LCL: 2434 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 27 m²/s²
0-3 km storm-relative helicity: 71 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

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

575 
WGUS55 KVEF 060649
FFWVEF
AZC015-CAC071-060845-
/O.NEW.KVEF.FF.W.0023.110706T0649Z-110706T0845Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
1149 PM PDT TUE JUL 5 2011

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTH CENTRAL MOHAVE COUNTY IN NORTHWEST ARIZONA...
  SOUTHEASTERN SAN BERNARDINO COUNTY IN SOUTHERN CALIFORNIA...

* UNTIL 145 AM PDT/145 AM MST/.

* AT 1145 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN FROM A THUNDERSTORM NEAR LAKE HAVASU CITY. THE     
  STORM PRODUCING VERY HEAVY RAIN WAS NEARLY STATIONARY. AN          
  AUTOMATED GAUGE EAST OF LAKE HAVASU RECORDED THREE QUARTERS OF AN  
  INCH IN FIFTEEN MINUTES.

* LOCATIONS IMPACTED INCLUDE...BIG RIVER...EARP...PARKER DAM...VIDAL
  JUNCTION...DESERT HILLS...LAKE HAVASU CITY...CATTAIL COVE STATE
  PARK...CRAZY HORSE CAMPGROUND...HAVASU FALLS RV RESORT...THREE
  DUNES CAMPGROUND AND BLACK MEADOW LANDING CAMPGROUND.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FLASH FLOODING IS EXPECTED IN WASHES...LOW WATER CROSSINGS AND ON
AREA ROADWAYS. FLASH FLOODING IS NATURES NUMBER ONE KILLER. TO ESCAPE
RISING WATER...MOVE TO HIGHER GROUND. NEVER TRY TO CROSS A FLOODED
ROADWAY OR WALK THROUGH FLOODWATERS. TURN AROUND...DONT DROWN!

REPORT FLOODING BY POSTING YOUR REPORT TO THE LAS VEGAS NATIONAL
WEATHER SERVICE FACEBOOK PAGE OR TWITTER #NWSVEGAS.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS EVEN HARDER TO SEE WATER
COVERING THE ROADWAY OR IN LOW WATER CROSSINGS.

&&

LAT...LON 3473 11488 3471 11430 3482 11376 3420 11366
      3420 11370 3424 11372 3424 11380 3422 11381
      3425 11399 3430 11405 3433 11414 3427 11412
      3418 11423 3408 11444 3409 11490

$$

STACHELSKI

2 follow-up statements

257 
WGUS75 KVEF 060727
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
1227 AM PDT WED JUL 6 2011

AZC015-CAC071-060845-
/O.CON.KVEF.FF.W.0023.000000T0000Z-110706T0845Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-SAN BERNARDINO CA-
1227 AM PDT WED JUL 6 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 145 AM PDT/145 AM
MST/ FOR SOUTHEASTERN SAN BERNARDINO AND SOUTH CENTRAL MOHAVE
COUNTIES...

AT 1225 AM MST...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED A 
THUNDERSTORM PRODUCING FLASH FLOODING IN LAKE HAVASU CITY. WATER WAS 
REPORTED OVER CURBS AND INTO BUSINESSES. THIS STORM WAS LOCATED NEAR 
CATTAIL COVE STATE PARK...OR NEAR PARKER DAM. THE THUNDERSTORM WITH 
EXCESSIVE RAIN WAS NEARLY STATIONARY.

LOCATIONS IMPACTED INCLUDE...BIG RIVER...EARP...PARKER DAM...VIDAL
JUNCTION...DESERT HILLS...LAKE HAVASU CITY...CATTAIL COVE STATE
PARK...CRAZY HORSE CAMPGROUND...HAVASU FALLS RV RESORT...THREE DUNES
CAMPGROUND AND BLACK MEADOW LANDING CAMPGROUND.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FLASH FLOODING IS EXPECTED IN WASHES...LOW WATER CROSSINGS AND ON
AREA ROADWAYS. FLASH FLOODING IS NATURES NUMBER ONE KILLER. TO ESCAPE
RISING WATER...MOVE TO HIGHER GROUND. NEVER TRY TO CROSS A FLOODED
ROADWAY OR WALK THROUGH FLOODWATERS. TURN AROUND...DONT DROWN!

REPORT FLOODING BY POSTING YOUR REPORT TO THE LAS VEGAS NATIONAL
WEATHER SERVICE FACEBOOK PAGE OR TWITTER #NWSVEGAS.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS EVEN HARDER TO SEE WATER
COVERING THE ROADWAY OR IN LOW WATER CROSSINGS.

&&

LAT...LON 3473 11488 3471 11430 3482 11376 3420 11366
      3420 11370 3424 11372 3424 11380 3422 11381
      3425 11399 3430 11405 3433 11414 3427 11412
      3418 11423 3408 11444 3409 11490

$$

STACHELSKI

691 
WGUS75 KVEF 060844
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
144 AM PDT WED JUL 6 2011

AZC015-CAC071-060851-
/O.EXP.KVEF.FF.W.0023.000000T0000Z-110706T0845Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-SAN BERNARDINO CA-
144 AM PDT WED JUL 6 2011

...THE FLASH FLOOD WARNING WILL EXPIRE AT 145 AM PDT/145 AM MST/ FOR
SOUTHEASTERN SAN BERNARDINO AND SOUTH CENTRAL MOHAVE COUNTIES...

THE LATEST REPORTS FROM THE LAKE HAVASU CITY POLICE DEPARTMENT WERE 
THAT WATER LEVELS ON AREA ROADS HAD DROPPED. IN ADDITION...RADAR 
INDICATED THAT THE INTENSITY OF THE RAIN HAD LET UP ACROSS THE AREA. 
THEREFORE THE FLASH FLOOD WARNING WILL BE ALLOWED TO EXPIRE. THOSE 
DRIVING SHOULD BE ALERT FOR WATER LINGERING IN LOW SPOTS FOR THE 
NEXT FEW HOURS.

LAT...LON 3473 11488 3471 11430 3482 11376 3420 11366
      3420 11370 3424 11372 3424 11380 3422 11381
      3425 11399 3430 11405 3433 11414 3427 11412
      3418 11423 3408 11444 3409 11490

$$

STACHELSKI

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 5, 6:18 PM MST	Flash Flood Warning	VEF	Mohave	50 min
Jul 5, 6:23 PM MST	Flash Flood Warning	VEF	Mohave	82 min
Jul 5, 11:19 PM MST	Areal Flood Advisory	VEF	Mohave	76 min
Jul 6, 12:04 AM MST	Severe Thunderstorm Warning	VEF	Mohave	41 min
Jul 6, 12:15 AM MST	Flash Flood Warning	VEF	Mohave	2 hr
Jul 6, 4:40 AM MST	Flash Flood Watch	VEF	Mohave	17 hr
Jul 6, 1:39 PM MST	Flash Flood Warning	VEF	Mohave	39 min
Jul 6, 12:14 PM MST	Areal Flood Advisory	VEF	Inyo	2 hr
Jul 6, 12:31 PM MST	Areal Flood Advisory	VEF	Inyo	119 min
Jul 6, 1:12 PM MST	Flash Flood Warning	VEF	Inyo	2 hr
Jul 6, 1:29 PM MST	Flash Flood Warning	VEF	Inyo	2 hr
Jul 6, 4:07 PM MST	Flash Flood Warning	VEF	Inyo	3 hr
Jul 6, 4:12 PM MST	Flash Flood Warning	VEF	Inyo	3 hr
Jul 6, 4:55 PM MST	Flash Flood Warning	VEF	Inyo	2 hr

Nearby

Flash Flood Warnings in Arizona, 2011 Flash Flood Warnings in California, 2011 Every flash flood warning in 2011

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.