Alert archive / Arizona / Flash Flood Warnings in 2014

Flash Flood Warning 185, NWS Las Vegas, NV

September 26, 2014Mohave County, Arizona

NWS Las Vegas, NV issued this flash flood warning at Sep 26, 2014, 7:13 PM MST for 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: Sep 26, 2014, 7:13 PM MST (02:13 UTC)
Expired: Sep 26, 2014, 10:15 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 Las Vegas radar (KESX), 121 km from the middle of the area, began a volume at 02:12 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this flash flood warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Flgstf/Belemont, AZ (KFGZ), launched 00:00Z, 2.2 hours before the alert went out and 177 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: 674 J/kg
Mixed-layer CIN: -11 J/kg
Mixed-layer LCL: 1353 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: 20 m²/s²
0-3 km storm-relative helicity: 9 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.

102 
WGUS55 KVEF 270213
FFWVEF
AZC015-270515-
/O.NEW.KVEF.FF.W.0185.140927T0213Z-140927T0515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
713 PM MST FRI SEP 26 2014

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

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

* UNTIL 1015 PM MST

* AT 701 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  FLASH FLOODING FROM A THUNDERSTORM 7 MILES EAST OF WILD COW
  CAMPGROUND...OR 20 MILES SOUTHEAST OF KINGMAN...MOVING NORTHEAST AT
  30 MPH.

* LOCATIONS IMPACTED INCLUDE...
  BLAKE RANCH RV PARK...DEAN PEAK BURN SCAR. 

THIS INCLUDES INTERSTATE 40 BETWEEN MILE MARKERS 60 AND 85.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FLASH FLOODING IS EXPECTED ON ROADS...IN NORMALLY DRY WASHES AND LOW
LYING AREAS. NEVER TRY TO CROSS A FLOODED ROAD OR ENTER A FLOOD
CHANNEL. TURN AROUND...DONT DROWN! BE ESPECIALLY CAUTIOUS AT NIGHT 
WHEN IT IS MORE DIFFICULT TO DETECT FLOODED ROADS.

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

HEAVY RAIN IS FALLING ON THE DEAN PEAK BURN AREA. WATER LEVELS
WILL RISE VERY RAPIDLY...LEADING TO MUD AND DEBRIS FLOWS IN AND
DOWNSTREAM OF THE BURN AREA.

&&

LAT...LON 3536 11381 3529 11344 3476 11359 3496 11407

$$

ASG

2 follow-up statements

070 
WGUS75 KVEF 270333
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
833 PM MST FRI SEP 26 2014

AZC015-270515-
/O.CON.KVEF.FF.W.0185.000000T0000Z-140927T0515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-
833 PM MST FRI SEP 26 2014

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1015 PM MST FOR
CENTRAL MOHAVE COUNTY...

AT 820 PM MST...HEAVY RAIN WAS CONTINUING TO FALL JUST EAST OF 
HIGHWAY 93 AND MOVING NORTH AROUND 25 MPH. MOST OF THE RAIN HAS 
ENDED OVER THE DEAN PEAK BURN AREA...HOWEVER RUNOFF FROM EARLIER 
HEAVY RAIN HAS THE POTENTIAL TO PRODUCE DEBRIS FLOWS OVER BLAKE 
RANCH ROAD.  

LOCATIONS IMPACTED INCLUDE...DEAN PEAK...BLAKE RANCH ROAD...HIGHWAY 
93...SOUTH OF INTERSTATE 40.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS MORE DIFFICULT TO DETECT
FLOODED ROADS.

&&

LAT...LON 3536 11381 3529 11344 3476 11359 3496 11407

$$

ASG

221 
WGUS75 KVEF 270507
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
1007 PM MST FRI SEP 26 2014

AZC015-270516-
/O.EXP.KVEF.FF.W.0185.000000T0000Z-140927T0515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-
1007 PM MST FRI SEP 26 2014

...THE FLASH FLOOD WARNING WILL EXPIRE AT 1015 PM MST FOR CENTRAL
MOHAVE COUNTY...

THE THUNDERSTORMS PRODUCING THE VERY HEAVY RAIN HAVE MOVED OUT OF 
THE WARNED AREA. ADDITIONAL SHOWERS ARE POSSIBLE THIS EVENING.

LAT...LON 3536 11381 3529 11344 3476 11359 3496 11407

$$

STUMPF

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 26, 3:15 PM MST, 3 hours 58 minutes earlier.

Area forecast discussion, Sep 26, 3:15 PM MST, 3 hours 58 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LAS VEGAS NV
315 PM PDT FRI SEP 26 2014

.SYNOPSIS...AN APPROACHING PACIFIC STORM WILL CONTINUE TO PRODUCE
GUSTY SOUTHERLY WINDS THROUGH SATURDAY. THIS SYSTEM WILL BRING
SHOWERS AND THUNDERSTORMS TO PORTIONS OF THE AREA THROUGH THE
WEEKEND WITH THE BEST CHANCE OF SIGNIFICANT RAIN OVER
LINCOLN...CLARK...MOHAVE AND EASTERN SAN BERNARDINO COUNTIES
TONIGHT. MUCH COOLER TEMPERATURES CAN BE EXPECTED OVER THE WEEKEND
INTO EARLY NEXT WEEK.
&&

.SHORT TERM...THROUGH SUNDAY NIGHT...NOT MUCH CHANGE TO THE PREVIOUS
THINKING. A MOIST AND UNSTABLE AIR MASS IS IN PLACE ACROSS THE
EASTERN CWA WITH A STRONG PACIFIC STORM APPROACHING FROM THE WEST
PROVIDING PLENTY OF LIFT. THESE WILL COMBINE TO PRODUCE SCATTERED TO
NUMEROUS SHOWERS AND THUNDERSTORMS ACROSS LINCOLN...CLARK...MOHAVE
AND EASTERN SAN BERNARDINO COUNTIES WITH A THREAT OF FLASH
FLOODING...STRONG WINDS AND LARGE HAIL. THE MODELS CONTINUE TO SHOW
A POSSIBLE LULL IN THE ACTIVITY THIS EVENING...PICKING UP AGAIN AND
INCREASING IN COVERAGE LATE THIS EVENING AND OVERNIGHT. THIS BAND OF
MOISTURE AND CONVECTION WILL EXIT NEVADA AND CALIFORNIA BY MID DAY
SATURDAY LEAVING MOHAVE COUNTY UNDER THE GUN MUCH OF THE
AFTERNOON...THEN EXITING MOHAVE COUNTY SATURDAY NIGHT. A FLASH FLOOD
WATCH IS IN EFFECT FOR LINCOLN...CLARK AND EASTERN SAN BERNARDINO
COUNTIES THROUGH LATE SATURDAY MORNING AND FOR MOHAVE COUNTY THROUGH
LATE SATURDAY AFTERNOON. MEANWHILE...THE UPPER TROUGH WILL CONTINUE
TO DEEPEN AND MOVE INTO NEVADA SATURDAY AND REMAIN NEARLY STATIONARY
THROUGH SUNDAY. THIS WILL RESULT IN ISOLATED TO SCATTERED SHOWERS
SATURDAY AFTERNOON THROUGH SUNDAY EVENING MAINLY NORTH OF LAS VEGAS.
GRADUAL CLEARING WILL TAKE PLACE SUNDAY NIGHT AS THE LOW MOVES INTO
WESTERN UTAH. TEMPERATURES OVER THE WEEKEND AND MONDAY WILL BE BELOW
NORMAL DUE TO THE INLUENCE OF THIS STRONG PACFIC STORM SYSTEM.

.LONG TERM...NORTHWEST FLOW SETS UP OVER THE WESTERN STATES MONDAY
THROUGH THURSDAY WITH MAINLY DRY CONDITIONS EXPECTED. A LINGERING
SHOWER OR TWO MAY BE POSSIBLE EARLY MONDAY OVER LINCOLN COUNTY ON
THE BACKSIDE OF THE WEEKEND LOW BUT OVERALL IT SHOULD NOT BE OF ANY
SIGNIFICANCE AS THE LOW AND ITS DYNAMICS MOVES AWAY. TEMPERATURES
SHOULD TREND UPWARDS DURING THE EARLY WEEK AND TOP OUT NEAR OR
SLIGHTLY ABOVE NORMAL BY WEDNESDAY. SHORTWAVE ENERGY IS FORECAST TO
MOVE THROUGH THE GREAT BASIN WEDNESDAY BUT MODELS DIFFER ON THE
TRACK IT WILL TAKE AND THIS WILL IMPACT THE WIND/TEMPERATURE
FORECAST FOR BOTH WEDNESDAY AND THURSDAY. ONLY SHOWED SLIGHT COOLING
ON THURSDAY BUT THIS COULD CHANGE IF THE SHORTWAVE BECOMES MORE WELL
DEFINED AND MOVES INTO THE SOUTHERN GREAT BASIN AS FORECAST BY THE
ECMWF.
&&

.AVIATION...FOR MCCARRAN...SOUTH/SOUTHWEST WINDS THROUGH THE EVENING
10-20 KTS WITH GUSTS TO 30 KTS...DECREASING TO 10-15 KTS LATE
EVENING. ISOLATED THUNDERSTORMS WILL BE IN THE AREA THROUGH TONIGHT
AND CANNOT BE RULED OUT DIRECTLY OVER THE TERMINAL.

FOR THE REST OF SOUTHERN NEVADA...NORTHWEST ARIZONA...AND SOUTHEAST
CALIFORNIA...SOUTH/SOUTHWEST WINDS 10-20 KTS AND GUSTS 30-35 KTS
THROUGH EARLY EVENING THEN DECREASING TO GENERALLY 10-15 KTS.
NUMEROUS CUMULUS THROUGH TONIGHT ALONG WITH ISOLATED TO SCATTERED
THUNDERSTORMS IN MAINLY LINCOLN...MOHAVE...CLARK AND EASTERN SAN
BERNARDINO COUNTIES. STORMS WILL PERSIST MUCH OF SATURDAY OVER
MOHAVE COUNTY. &&

.SPOTTER INFORMATION STATEMENT...
THERE IS POTENTIAL FOR SOME STRONG THUNDERSTORMS ACROSS THE EASTERN
PORTION OF THE FORECAST AREA TONIGHT THROUGH EARLY SATURDAY. SPOTTER
ACTIVATION IS POSSIBLE. SPOTTER ACTIVATION IS NOT EXPECTED SUNDAY
THROUGH THURSDAY.
&&

SHORT TERM/AVIATION...HARRISON
LONG TERM...SALMEN

FOR MORE FORECAST INFORMATION...SEE US ON OUR WEBPAGE:

HTTP://WEATHER.GOV/LASVEGAS OR FOLLOW US ON FACEBOOK AND TWITTER

In the hours before

Local storm report, Sep 26, 1:57 PM MST, 5 hours 16 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LAS VEGAS NV
157 PM PDT FRI SEP 26 2014

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0100 PM     NON-TSTM WND GST 2 SE YUCCA FLAT (NTS SR 36.94N 116.04W
09/26/2014  M62 MPH          NYE                NV   MESONET

            TEST SITE SENSOR A43 REPORTED GUST TO 62 MPH.

&&

WOLCOTT

Local storm report, Sep 26, 4:52 PM MST, 2 hours 21 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LAS VEGAS NV
452 PM PDT FRI SEP 26 2014

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0415 PM     FLASH FLOOD      13 W MUDDY RIVER (MOAN2 36.72N 114.93W
09/26/2014                   CLARK              NV   PUBLIC

            PUBLIC REPORTS WATER AND GOOD SIZED ROCKS FLOWING ACROSS
            HIGHWAY 93...6 MILES SOUTH OF COYOTE SPRINGS. WATER WAS
            ALSO STARTING TO COME ACROSS THE ROAD ONE-HALF MILE NORTH
            OF COYOTE SPRINGS.

&&

WOLCOTT

Local storm report, Sep 26, 6:10 PM MST, 1 hour 3 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LAS VEGAS NV
610 PM PDT FRI SEP 26 2014

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0532 PM     FLASH FLOOD      1 SE BOULDER CITY       35.97N 114.82W
09/26/2014                   CLARK              NV   TRAINED SPOTTER

            TRAINED SPOTTER REPORTS SEVERAL AREAS WITH 6-8 INCHES OF
            WATER FLOWING ACROSS ROADWAYS IN BOULDER CITY. WATER WAS
            STILL FLOWING AT 602 PM.

&&

WOLCOTT

Local storm report, Sep 26, 6:39 PM MST, 34 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LAS VEGAS NV
639 PM PDT FRI SEP 26 2014

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0629 PM     TSTM WND GST     NORTH LAS VEGAS         36.27N 115.14W
09/26/2014  M63 MPH          CLARK              NV   ASOS

            THE ASOS AT THE NORTH LAS VEGAS AIRPORT RECORDED A PEAK
            WIND GUST OF 63 MPH ASSOCIATED WITH A THUNDERSTORM.

&&

ASG

Local storm report, Sep 26, 6:53 PM MST, 20 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LAS VEGAS NV
653 PM PDT FRI SEP 26 2014

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0645 PM     TSTM WND DMG     5 SSW LAS VEGAS         36.11N 115.19W
09/26/2014                   CLARK              NV   TRAINED SPOTTER

            THUNDERSTORM WINDS CAUSED A HEAVY CONSTRUCTION BARRICADE
            TO BLOW INTO A CAR CAUSING SIGNIFICANT BODY DAMAGE.

&&

ASG

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 26, 9:56 PM MST	Flash Flood Warning	VEF	Mohave	2 hr
Sep 26, 10:16 PM MST	Flash Flood Warning	VEF	Mohave	3 hr
Sep 26, 11:22 PM MST	Flash Flood Warning	VEF	Mohave	3 hr
Sep 27, 1:37 AM MST	Flash Flood Warning	VEF	Mohave	3 hr
Sep 27, 4:59 AM MST	Flash Flood Warning	VEF	Mohave	3 hr
Sep 27, 5:25 AM MST	Flash Flood Warning	VEF	Mohave	3 hr
Sep 27, 6:48 AM MST	Areal Flood Advisory	VEF	Mohave	3 hr
Sep 27, 7:03 AM MST	Severe Thunderstorm Warning	VEF	Mohave	42 min
Sep 27, 7:18 AM MST	Severe Thunderstorm Warning	VEF	Mohave	27 min
Sep 27, 7:35 AM MST	Areal Flood Advisory	VEF	Mohave	4 hr
Sep 27, 7:59 AM MST	Severe Thunderstorm Warning	VEF	Mohave	19 min
Sep 27, 8:10 AM MST	Flash Flood Warning	VEF	Mohave	2 hr
Sep 27, 8:16 AM MST	Flash Flood Warning	VEF	Mohave	3 hr
Sep 27, 8:40 AM MST	Flash Flood Warning	VEF	Mohave	4 hr
Sep 27, 8:56 AM MST	Areal Flood Advisory	VEF	Mohave	4 hr
Sep 27, 9:11 AM MST	Areal Flood Warning	VEF	Mohave	18 hr
Sep 27, 9:41 AM MST	Areal Flood Advisory	VEF	Mohave	4 hr
Sep 27, 3:39 PM MST	Areal Flood Advisory	VEF	Mohave	6 hr

Nearby

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.