Alert archive / Nevada / Flash Flood Warnings in 2015

Flash Flood Warning 151, NWS Las Vegas, NV

October 18, 2015Clark County, Nevada

NWS Las Vegas, NV issued this flash flood warning at Oct 18, 2015, 1:39 PM PDT for Clark County, Nevada. It was in force for 3 hr. 2 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
Oct 18, 2015, 1:39 PM PDT (20:39 UTC)
Expired
Oct 18, 2015, 4:45 PM PDT
In force
3 hr
Issued by
NWS Las Vegas, NV
Area
Storm-based polygon
Flood severity
None

County Clark County, NV

What was reported inside it

TimeReportWhereRemark
Oct 18, 2:29 PM PDTFLASH FLOOD5 S Red Rock Canyon, NVOVER 6 INCHES OF RAPIDLY FLOWING WATER WAS REPORTED AT THE ENTRANCE TO SPRING MOUNTAIN RANCH STATE PARK.
Oct 18, 3:30 PM PDTFLASH FLOOD2 Ese Red Rock Canyon, NVBLM REPORTS ROCKS AND DEBRIS BLOCKING SCENIC LOOP RD. TIME ESTIMATED BY RADAR.

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, 8.7 hours before the alert went out and 20 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 2015-10-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 184 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 2015-10-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 68 square meters per square second.19395878Sfc1 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
184 J/kg
Mixed-layer CIN
-109 J/kg
Mixed-layer LCL
1328 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
68 m²/s²
0-3 km storm-relative helicity
90 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

Open this sounding in Storm Lab

The text

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

520 
WGUS55 KVEF 182039
FFWVEF
NVC003-182345-
/O.NEW.KVEF.FF.W.0151.151018T2039Z-151018T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
139 PM PDT SUN OCT 18 2015

THE NATIONAL WEATHER SERVICE IN LAS VEGAS  HAS ISSUED A

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

* UNTIL 445 PM PDT

* AT 137 PM PDT...DOPPLER RADAR AND AUTOMATED RAIN GAUGES INDICATED 
  HEAVY RAIN FALLING ACROSS RED ROCK CANYON. OVER A HALF AN INCH OF 
  RAIN HAS FALLEN IN THE PAST TEN MINUTES. 

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE... BLUE 
  DIAMOND...RED ROCK CANYON... SPRING MOUNTAINS...SUMMERLIN...MARY 
  JANE FALLS CAMPGROUND...KYLE CANYON CAMPGROUND...RED ROCK CANYON 
  CAMPGROUND...LOVELL CANYON CAMPGROUND...HILLTOP 
  CAMPGROUND...MOUNTAIN SPRINGS...CORN CREEK VISITORS 
  CENTER...SPRING MOUNTAIN RANCH...MAHOGANY GROVE CAMPGROUND...ROCKY 
  GAP CAMPGROUND...FLETCHER VIEW CAMPGROUND AND MT. POTOSI.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FLASH FLOODING IS EXPECTED IN WASHES...LOW WATER CROSSINGS AND ON
ROADS. TO ESCAPE RISING WATER...MOVE TO HIGHER GROUND. NEVER TRY TO
CROSS A FLOODED ROAD OR ENTER A FLOOD CHANNEL. TURN AROUND...DONT
DROWN! REPORT FLOODING TO THE LAS VEGAS NATIONAL WEATHER SERVICE VIA
FACEBOOK OR TWITTER.

TURN AROUND...DONT DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

&&

LAT...LON 3612 11534 3596 11533 3596 11567 3621 11569
      3659 11561 3649 11533

$$

OUTLER
2 follow-up statements
960 
WGUS75 KVEF 182157
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
257 PM PDT SUN OCT 18 2015

NVC003-182345-
/O.CON.KVEF.FF.W.0151.000000T0000Z-151018T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CLARK NV-
257 PM PDT SUN OCT 18 2015

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 445 PM PDT FOR
NORTHWESTERN CLARK COUNTY...

AT 255 PM PDT...ADDITIONAL STRONG STORMS HAVE DEVELOPED WEST OF RED 
ROCK CANYON AND ALONG HIGHWAY 157 NEAR CORN CREEK. OVER AN INCH OF 
RAIN HAS FALLEN NEAR GRAPEVINE SPRINGS ON HIGHWAYS 157 WEST OF CORN 
CREEK. FLASH FLOODING REMAINS A THREAT THROUGH THIS EVENING. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FLASH FLOODING IS EXPECTED IN WASHES...LOW WATER CROSSINGS AND ON
ROADS. TO ESCAPE RISING WATER...MOVE TO HIGHER GROUND. NEVER TRY TO
CROSS A FLOODED ROAD OR ENTER A FLOOD CHANNEL. TURN AROUND...DONT
DROWN! REPORT FLOODING TO THE LAS VEGAS NATIONAL WEATHER SERVICE VIA
FACEBOOK OR TWITTER.

TURN AROUND...DONT DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

&&

LAT...LON 3612 11534 3596 11533 3596 11567 3621 11569
      3659 11561 3649 11533

$$

OUTLER
741 
WGUS75 KVEF 182340
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
440 PM PDT SUN OCT 18 2015

NVC003-182348-
/O.EXP.KVEF.FF.W.0151.000000T0000Z-151018T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CLARK NV-
440 PM PDT SUN OCT 18 2015

...THE FLASH FLOOD WARNING FOR NORTHWESTERN CLARK COUNTY WILL EXPIRE
AT 445 PM PDT...

LIGHT TO MODERATE RAIN PERSISTS ACROSS THE RED ROCK CANYON AND 
SPRING MOUNTAIN AREAS...BUT THE INTENSE FLOODING RAIN HAS NOT 
OCCURRED IN THE PAST HOUR. THE FLASH FLOOD WARNING WILL BE ALLOWED 
TO EXPIRE. RUNOFF FROM EARLIER RAINFALL AND ELEVATED STREAM FLOWS 
CAN BE EXPECTED TO PERSIST THROUGH THE EVENING. SOME ROADS AROUND 
RED ROCK CANYON HAVE BEEN CLOSED DUE TO FLOODING.


LAT...LON 3612 11534 3596 11533 3596 11567 3621 11569
      3659 11561 3649 11533

$$

OUTLER

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 18, 5:03 AM PDTAreal Flood AdvisoryVEFNye117 min
Oct 18, 8:06 AM PDTFlash Flood WarningVEFNye4 hr
Oct 18, 10:42 AM PDTSevere Thunderstorm WarningVEFLincoln48 min
Oct 18, 11:50 AM PDTFlash Flood WarningVEFEsmeralda, Nye3 hr
Oct 18, 11:58 AM PDTFlash Flood WarningVEFNye3 hr
Oct 18, 12:05 PM PDTFlash Flood WarningVEFEsmeralda3 hr
Oct 18, 12:25 PM PDTFlash Flood WarningVEFClark, Nye3 hr
Oct 18, 12:39 PM PDTSevere Thunderstorm WarningVEFLincoln51 min
Oct 18, 1:27 PM PDTSevere Thunderstorm WarningVEFLincoln33 min
Oct 18, 2:55 PM PDTFlash Flood WarningVEFClark, Lincoln4 hr
Oct 18, 3:07 PM PDTFlash Flood WarningVEFEsmeralda, Nye3 hr
Oct 18, 3:25 PM PDTFlash Flood WarningVEFClark4 hr
Oct 18, 3:35 PM PDTFlash Flood WarningVEFClark3 hr
Oct 18, 3:43 PM PDTSevere Thunderstorm WarningVEFClark47 min
Oct 18, 4:13 PM PDTSevere Thunderstorm WarningVEFClark47 min
Oct 18, 4:52 PM PDTFlash Flood WarningVEFClark3 hr

Nearby

Flash Flood Warnings in Nevada, 2015Every flash flood warning in 2015

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.