Alert archive / Arizona / Flash Flood Warnings in 2012

Flash Flood Warning 50, NWS Las Vegas, NV

July 16, 2012Mohave County, Arizona

NWS Las Vegas, NV issued this flash flood warning at Jul 16, 2012, 11:53 AM MST for 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 16, 2012, 11:53 AM MST (18:53 UTC)
Expired: Jul 16, 2012, 2:45 PM MST
In force: 3 hr
Issued by: NWS Las Vegas, NV
Area: Storm-based polygon
Flood severity: None

County Mohave County, AZ

The radar

The Cedar City radar (KICX), 76 km from the middle of the area, began a volume at 18:53 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 16, 1:25 PM MST	FLASH FLOOD	Colorado City, AZ	911 DISPATCH IN COLORADO CITY REPORTED LARGE TREES BEING REMOVED FROM BANKS OF THE SHORT CREEK DRAINAGE. OTHER LARGE DEBRIS HAS BEEN REPORTED IN THE FLOW.

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

The nearest sounding before it

Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 6.9 hours before the alert went out and 221 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: 84 J/kg
Mixed-layer CIN: -67 J/kg
Mixed-layer LCL: 956 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 73 m²/s²
0-3 km storm-relative helicity: 128 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.

324 
WGUS55 KVEF 161853
FFWVEF
AZC015-162030-
/O.NEW.KVEF.FF.W.0050.120716T1853Z-120716T2030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
1153 AM MST MON JUL 16 2012

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHEASTERN MOHAVE COUNTY IN NORTHWEST ARIZONA...

* UNTIL 130 PM MST.

* AT 1147 AM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN FROM A THUNDERSTORM 7 MILES SOUTHWEST OF COLORADO
  CITY...MOVING NORTHEAST AT 15 MPH.

* LOCATIONS IMPACTED INCLUDE...
  COLORADO CITY.

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 BY USING THE TWITTER HASHTAG...
NWSVEGAS.

&&

LAT...LON 3678 11302 3684 11322 3700 11324 3701 11323
      3701 11316 3700 11284 3699 11284

$$

JENSEN

5 follow-up statements

034 
WGUS75 KVEF 161940
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
1240 PM MST MON JUL 16 2012

AZC015-162030-
/O.CON.KVEF.FF.W.0050.000000T0000Z-120716T2030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-
1240 PM MST MON JUL 16 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 130 PM MST FOR
NORTHEASTERN MOHAVE COUNTY...

AT 1231 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A THUNDERSTORM PRODUCING VERY HEAVY RAIN.  THIS STORM WAS
LOCATED 6 MILES SOUTH OF COLORADO CITY...MOVING NORTHEAST AT 25 MPH.

A PREVIOUS THUNDERSTORM MOVED ACROSS COLORADO CITY AROUND 1215 PM 
MST WHICH PRODUCED VERY HEAVY RAINFALL AND HALF INCH SIZED HAIL.
LOCATIONS IMPACTED INCLUDE...
COLORADO CITY.

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 BY USING THE TWITTER HASHTAG...
NWSVEGAS.

&&

LAT...LON 3678 11302 3684 11322 3700 11324 3701 11323
      3701 11316 3700 11284 3699 11284

$$

JENSEN

415 
WGUS55 KVEF 162025
FFWVEF
AZC015-162045-
/O.EXT.KVEF.FF.W.0050.000000T0000Z-120716T2045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
125 PM MST MON JUL 16 2012

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS EXTENDED THE

* FLASH FLOOD WARNING FOR...
  NORTHEASTERN MOHAVE COUNTY IN NORTHWEST ARIZONA...

* UNTIL 145 PM MST.

* AT 114 PM MST...THUNDERSTORMS HAVE MOVED OUT OF THE AREA...HOWEVER 
HEAVY RAINFALL FROM PREVIOUS STORMS IS NOW BEGINNING TO MOVE OUT OF 
THE CANYON AND INTO THE COLORADO CITY AREA.

REPORTS FROM THE COLORADO CITY DISPATCH INDICATES THAT AS OF 120 PM 
MST...THE WATER WATER WAS JUST BEGINNING TO COME OUT OF THE SHORT 
CREEK DRAINAGE WITH TREES AND ROCKS BEING CARRIED BY THE WATER.

* LOCATIONS IMPACTED INCLUDE...
  COLORADO CITY AND THE WESTERN PORTION OF HIGHWAY 389.

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 BY USING THE TWITTER HASHTAG...
NWSVEGAS.

&&

LAT...LON 3678 11302 3684 11322 3700 11324 3701 11323
      3701 11316 3700 11284 3699 11284

$$

JENSEN

013 
WGUS55 KVEF 162031
FFWVEF
AZC015-162145-
/O.EXT.KVEF.FF.W.0050.000000T0000Z-120716T2145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
131 PM MST MON JUL 16 2012

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS EXTENDED THE

* FLASH FLOOD WARNING FOR...
  NORTHEASTERN MOHAVE COUNTY IN NORTHWEST ARIZONA...

* UNTIL 245 PM MST...WHICH EXTENDS THE RECENTLY ISSUED WARNING.

* AT 123 PM MST...THUNDERSTORMS HAVE MOVED OUT OF THE AREA...
  HOWEVER HEAVY RAINFALL FROM PREVIOUS STORMS IS NOW BEGINNING
  TO MOVE OUT OF THE CANYON AND INTO THE COLORADO CITY AREA.

  REPORTS FROM THE COLORADO CITY DISPATCH INDICATES THAT AS OF
  120 PM MST...THE WATER WATER WAS JUST BEGINNING TO COME OUT OF THE
  SHORT CREEK DRAINAGE WITH TREES AND ROCKS BEING CARRIED BY THE
  WATER.

* LOCATIONS IMPACTED INCLUDE...
  COLORADO CITY AND THE WESTERN PORTION OF HIGHWAY 389.

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 BY USING THE TWITTER HASHTAG...
NWSVEGAS.

&&

LAT...LON 3678 11302 3684 11322 3700 11324 3701 11323
      3701 11316 3700 11284 3699 11284

$$

JENSEN

162 
WGUS75 KVEF 162116
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
216 PM MST MON JUL 16 2012

AZC015-162145-
/O.CON.KVEF.FF.W.0050.000000T0000Z-120716T2145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-
216 PM MST MON JUL 16 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 245 PM MST FOR
NORTHEASTERN MOHAVE COUNTY...

AT 206 PM MST...ALTHOUGH ADDITIONAL THUNDERSTORMS MAY MOVE INTO THE 
AREA LATER THIS AFTERNOON...RAINFALL HAS ENDED. REPORTS RECEIVED 
FROM COLORADO CITY AS OF 120 PM MST INDICATED THAT WATER WAS 
BEGINNING TO FLOW OUT OF SHORT CREEK AND MOVING INTO THE AREA. NO 
ADDITIONAL REPORTS HAVE BEEN RECEIVED AT THIS TIME...BUT WILL 
CONTINUE THE FLASH FLOOD WARNING THROUGH 245 PM MST.

LOCATIONS IMPACTED INCLUDE...
COLORADO CITY AND THE WESTERN PORTION OF HIGHWAY 389.

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 BY USING THE TWITTER HASHTAG...
NWSVEGAS.

&&

LAT...LON 3678 11302 3684 11322 3700 11324 3701 11323
      3701 11316 3700 11284 3699 11284

$$

JENSEN

189 
WGUS75 KVEF 162140
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
240 PM MST MON JUL 16 2012

AZC015-162148-
/O.EXP.KVEF.FF.W.0050.000000T0000Z-120716T2145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-
240 PM MST MON JUL 16 2012

...THE FLASH FLOOD WARNING WILL EXPIRE AT 245 PM MST FOR NORTHEASTERN
MOHAVE COUNTY...

REPORTS FROM THE COLORADO CITY DISPATCH INDICATE THAT AS OF 235 PM 
MST THE WATER HAS RECEDED IN THE AREA. THUS WILL ALLOW THE FLASH 
FLOOD WARNING TO EXPIRE AS OF 245 PM MST.

LAT...LON 3678 11302 3684 11322 3700 11324 3701 11323
      3701 11316 3700 11284 3699 11284

$$

JENSEN

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 15, 5:42 PM MST	Flash Flood Warning	VEF	Mohave	93 min
Jul 15, 7:12 PM MST	Severe Thunderstorm Warning	VEF	Mohave	22 min
Jul 16, 2:00 AM MST	Flash Flood Watch	VEF	Mohave	19 hr
Jul 16, 1:56 PM MST	Severe Thunderstorm Warning	VEF	Mohave	27 min
Jul 16, 2:22 PM MST	Severe Thunderstorm Warning	VEF	Mohave	23 min
Jul 16, 3:03 PM MST	Flash Flood Warning	VEF	Mohave	60 min
Jul 16, 3:36 PM MST	Severe Thunderstorm Warning	VEF	Mohave	39 min

Nearby

Flash Flood Warnings in Arizona, 2012 Every flash flood warning in 2012

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.