Alert archive / Nevada / Flash Flood Warnings in 2016

Flash Flood Warning 2, NWS Las Vegas, NV

April 9, 2016Clark County, Nevada

NWS Las Vegas, NV issued this flash flood warning at Apr 9, 2016, 1:10 PM PDT for Clark County, Nevada. It was in force for 3 hr. 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
Apr 9, 2016, 1:10 PM PDT (20:10 UTC)
Expired
Apr 9, 2016, 4:15 PM PDT
In force
3 hr
Issued by
NWS Las Vegas, NV
Area
Storm-based polygon
Flood severity
None

County Clark County, NV

The radar

The Las Vegas radar (KESX), 57 km from the middle of the area, began a volume at 20:10 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

TimeReportWhereRemark
Apr 9, 1:12 PM PDTFLASH FLOOD1 Wsw Downtown Las Vega, NVFLOWING WATER 1 FOOT DEEP OVER ROADWAY REPORTED VIA SOCIAL MEDIA
Apr 9, 1:15 PM PDTFLASH FLOOD2 Ese North Las Vegas A, NV1 TO 1.5 FEET OF WATER FLOWED INTO HOUSE NEAR W LAKE MEAD BLVD AND N TONOPAH DR. REPORT VIA RED CROSS TWITTER. ALSO RECEIVED REPORT OF A COLLAPSED PATIO AWNING WHICH WAS DAMAGED UNDER THE STRESS OF ACCUMULATED HEAVY RAINFALL IN NORTH LAS VEGAS.
Apr 9, 1:29 PM PDTFLASH FLOOD1 Ssw Downtown Las Vega, NV6 INCHES OF FLOWING WATER FLOODING ROADWAY IN THE ART DISTRICT. REPORTED VIA SOCIAL MEDIA
Apr 9, 1:32 PM PDTFLASH FLOOD1 Ne The Strip, NV6-8 INCHES OF FLOWING WATER OVER PARADISE ROAD JUST SOUTH OF THE WESTGATE. REPORTED VIA SOCIAL MEDIA
Apr 9, 2:35 PM PDTFLASH FLOODThe Strip, NVRAPIDLY FLOWING WATER THROUGH PARKING GARAGE AT THE THE LINQ. WATER ESTIMATED AT 6 TO 8 INCHES DEEP. REPORTED VIA SOCIAL MEDIA VIDEO

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, 8.2 hours before the alert went out and 44 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 12:00Z on 2016-04-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 27 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Las Vegas, NV at 12:00Z on 2016-04-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 50 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
27 J/kg
Mixed-layer CIN
-29 J/kg
Mixed-layer LCL
743 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
50 m²/s²
0-3 km storm-relative helicity
71 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

320 
WGUS55 KVEF 092010
FFWVEF
NVC003-092315-
/O.NEW.KVEF.FF.W.0002.160409T2010Z-160409T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
110 PM PDT SAT APR 9 2016

THE NATIONAL WEATHER SERVICE IN LAS VEGAS  HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WESTERN CLARK COUNTY IN SOUTHERN NEVADA...

* UNTIL 415 PM PDT
    
* AT 109 PM PDT...DOPPLER RADAR INDICATED A THUNDERSTORM PRODUCING
  HEAVY RAIN OVER LAS VEGAS. THE STORM IS NEARLY STATIONARY. FLASH
  FLOODING IS EXPECTED TO BEGIN SHORTLY.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE... LAS
  VEGAS...NORTH LAS VEGAS...EAST LAS VEGAS... DOWNTOWN LAS
  VEGAS...THE STRIP...NELLIS AFB...STRATOSPHERE TOWER AND UNLV.

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

&&

LAT...LON 3629 11495 3611 11509 3607 11518 3609 11521
      3614 11523 3629 11516

$$

LERICOS
3 follow-up statements
619 
WGUS75 KVEF 092033
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
133 PM PDT SAT APR 9 2016

NVC003-092315-
/O.CON.KVEF.FF.W.0002.000000T0000Z-160409T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CLARK NV-
133 PM PDT SAT APR 9 2016

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 415 PM PDT FOR
WESTERN CLARK COUNTY...

AT 127 PM PDT...THE PUBLIC REPORTED FLASH FLOODING OCCURRING IN AND
NEAR DOWNTOWN LAS VEGAS. ONE TO TWO INCHES OF RAIN HAS ALREADY
FALLEN IN THE AREA.

FLOOD WATERS ARE MOVING DOWN STREETS AND INTO FLOOD CHANNELS. FLOOD
CONTROL WASHES IN THE WARNING AREA ARE RUNNING WITH TWO TO NINE FEET
OF WATER AND CONTINUE TO RISE. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FLASH FLOODING IS EXPECTED ON AREA ROADWAYS ROADS...IN NORMALLY DRY
WASHES AND LOW LYING AREAS. NEVER TRY TO CROSS A FLOODED ROAD AND
NEVER ENTER A FLOOD CHANNEL. REPORT FLOODING TO THE LAS VEGAS
NATIONAL WEATHER SERVICE VIA FACEBOOK OR TWITTER.

&&

LAT...LON 3629 11495 3611 11509 3607 11518 3609 11521
      3614 11523 3629 11516

$$

LERICOS
008 
WGUS75 KVEF 092135
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
235 PM PDT SAT APR 9 2016

NVC003-092315-
/O.CON.KVEF.FF.W.0002.000000T0000Z-160409T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CLARK NV-
235 PM PDT SAT APR 9 2016

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 415 PM PDT FOR
WESTERN CLARK COUNTY...

AT 227 PM PDT...IMPACTS FROM FLASH FLOODING CONTINUE ACROSS THE
AREA. 

FLOOD WATERS CONTINUE TO MOVE DOWN STREETS INTO FLOOD CHANNELS.
FLOOD CONTROL GAUGES NOW INDICATE THAT FLOOD WATERS ARE BEGINNING TO
CREST. SOME CHANNELS ARE RECORDING RAPIDLY MOVING WATER DEPTHS AS
HIGH AS 9 TO 11 FEET. 

THIS STILL REMAINS A DANGEROUS SITUATION. ADDITION RAINFALL MOVING IN
FROM THE SOUTH COULD ADD TO THE IMPACTS FROM PREVIOUS STORMS.  

PRECAUTIONARY/PREPAREDNESS ACTIONS...

KEEP CHILDREN AWAY FROM STORM FLOOD CONTROL CHANNELS AND OTHER
INFRASTRUCTURES. WATER LEVELS CAN RISE RAPIDLY AND SWEEP CHILDREN
AWAY.

DO NOT ENTER OR CROSS FLOWING WATER OR WATER OF UNKNOWN DEPTH. 

&&

LAT...LON 3629 11495 3611 11509 3607 11518 3609 11521
      3614 11523 3629 11516

$$

LERICOS
358 
WGUS75 KVEF 092242
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
342 PM PDT SAT APR 9 2016

NVC003-092251-
/O.CAN.KVEF.FF.W.0002.000000T0000Z-160409T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CLARK NV-
342 PM PDT SAT APR 9 2016

...THE FLASH FLOOD WARNING FOR WESTERN CLARK COUNTY IS CANCELLED...

THIS WARNING HAS BEEN REPLACED BY A FLASH FLOOD WARNING FOR THE LAS
VEGAS VALLEY UNTIL 630 PM PDT.

LAT...LON 3629 11495 3611 11509 3607 11518 3609 11521
      3614 11523 3629 11516

$$

MORGAN

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 9, 11:39 AM PDTAreal Flood AdvisoryVEFClark, Lincoln3 hr
Apr 9, 12:48 PM PDTAreal Flood AdvisoryVEFClark3 hr
Apr 9, 3:38 PM PDTFlash Flood WarningVEFClark3 hr

Nearby

Flash Flood Warnings in Nevada, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.