Alert archive / Nevada / Flash Flood Warnings in 2017

Flash Flood Warning 39, NWS Las Vegas, NV

July 25, 2017Clark County, Nevada

NWS Las Vegas, NV issued this flash flood warning at Jul 25, 2017, 2:15 AM PDT for Clark County, Nevada. 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
Jul 25, 2017, 2:15 AM PDT (09:15 UTC)
Expired
Jul 25, 2017, 5:15 AM 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), 94 km from the middle of the area, began a volume at 09:17 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.

The nearest sounding before it

Las Vegas, NV (KVEF), launched 00:00Z, 9.3 hours before the alert went out and 68 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 00:00Z on 2017-07-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 183 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 00:00Z on 2017-07-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 18 square meters per square second.193958Sfc1 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
183 J/kg
Mixed-layer CIN
-90 J/kg
Mixed-layer LCL
2329 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
18 m²/s²
0-3 km storm-relative helicity
51 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

292 
WGUS55 KVEF 250915
FFWVEF
NVC003-251215-
/O.NEW.KVEF.FF.W.0039.170725T0915Z-170725T1215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Las Vegas NV
215 AM PDT TUE JUL 25 2017

The National Weather Service in Las Vegas has issued a

* Flash Flood Warning for...
  North central Clark County in southern Nevada...

* Until 515 AM PDT

* At 214 AM PDT, Doppler radar indicated thunderstorms producing 
  heavy rain over northern portions of Clark County. Flash flooding 
  is expected to begin shortly.

* Some locations that will experience flooding include...
  Moapa Town, Sr 168, Coyote Springs and Gass Pk. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Be especially cautious at night when it is harder to recognize the
dangers of flooding.

&&

LAT...LON 3633 11466 3639 11518 3685 11509 3684 11447

$$
2 follow-up statements
349 
WGUS75 KVEF 251035
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
335 AM PDT TUE JUL 25 2017

NVC003-251215-
/O.CON.KVEF.FF.W.0039.000000T0000Z-170725T1215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Clark NV-
335 AM PDT TUE JUL 25 2017

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 515 AM PDT FOR
NORTH CENTRAL CLARK COUNTY...

At 332 AM PDT, Doppler radar indicated thunderstorms producing heavy 
rain across the warned area. An automated rain gauge just east of 
Highway 93 along Highway 168 has recorded close to two inches of 
rain since 200 AM. Flash flooding is likely occurring. 

Some locations that will experience flooding include...
Moapa Town, Sr 168, Coyote Springs and Gass Pk. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Be especially cautious at night when it is harder to recognize the
dangers of flooding.

&&

LAT...LON 3633 11466 3639 11518 3685 11509 3684 11447

$$

ASG
691 
WGUS75 KVEF 251211
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
511 AM PDT TUE JUL 25 2017

NVC003-251220-
/O.EXP.KVEF.FF.W.0039.000000T0000Z-170725T1215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Clark NV-
511 AM PDT TUE JUL 25 2017

...THE FLASH FLOOD WARNING FOR NORTH CENTRAL CLARK COUNTY WILL EXPIRE
AT 515 AM PDT...

Light to occasional moderate rain will fall over northern Clark 
County through sunrise and the threat of flash flooding has ended. 
Please continue to heed any remaining road closures.

LAT...LON 3633 11466 3639 11518 3685 11509 3684 11447

$$

ASG

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 24, 5:39 PM PDTAreal Flood AdvisoryVEFLincoln3 hr
Jul 24, 7:13 PM PDTFlash Flood WarningVEFLincoln3 hr
Jul 24, 9:34 PM PDTFlash Flood WarningVEFClark3 hr
Jul 24, 11:59 PM PDTFlash Flood WatchVEFClark, Nye20 hr
Jul 25, 12:43 AM PDTAreal Flood AdvisoryVEFLincoln4 hr
Jul 25, 4:54 AM PDTFlash Flood WarningVEFClark6 hr
Jul 25, 5:42 AM PDTFlash Flood WarningVEFLincoln10 hr
Jul 25, 6:55 AM PDTFlash Flood WarningVEFClark5 hr
Jul 25, 8:06 AM PDTFlash Flood WarningVEFClark8 hr
Jul 25, 10:28 AM PDTAreal Flood AdvisoryVEFClark3 hr
Jul 25, 10:47 AM PDTAreal Flood AdvisoryVEFClark6 hr
Jul 25, 11:06 AM PDTFlash Flood WarningVEFClark6 hr
Jul 25, 1:57 PM PDTAreal Flood AdvisoryVEFEsmeralda4 hr
Jul 25, 2:57 PM PDTFlash Flood WarningVEFLincoln, Nye3 hr
Jul 25, 4:23 PM PDTFlash Flood WarningVEFLincoln, Nye3 hr

Nearby

Flash Flood Warnings in Nevada, 2017Every flash flood warning in 2017

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.