Alert archive / California / Flash Flood Warnings in 2016

Flash Flood Warning 116, NWS Las Vegas, NV

August 27, 2016San Bernardino County, California

NWS Las Vegas, NV issued this flash flood warning at Aug 27, 2016, 5:06 AM PDT for San Bernardino County, California. It was in force for 4 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
Aug 27, 2016, 5:06 AM PDT (12:06 UTC)
Expired
Aug 27, 2016, 9:00 AM PDT
In force
4 hr
Issued by
NWS Las Vegas, NV
Area
Storm-based polygon
Flood severity
None

County San Bernardino County, CA

The radar

The Las Vegas radar (KESX), 80 km from the middle of the area, began a volume at 12:09 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 12:00Z, 0.1 hours before the alert went out and 169 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 2016-08-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2016-08-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 31 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1919 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
31 m²/s²
0-3 km storm-relative helicity
250 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

805 
WGUS55 KVEF 271206
FFWVEF
CAC071-271600-
/O.NEW.KVEF.FF.W.0116.160827T1206Z-160827T1600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
506 AM PDT SAT AUG 27 2016

THE NATIONAL WEATHER SERVICE IN LAS VEGAS  HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EAST CENTRAL SAN BERNARDINO COUNTY IN SOUTHERN CALIFORNIA...

* UNTIL 900 AM PDT

* DEEP WATER FLOWING ACROSS HIGHWAY 95 NEAR MILE MARKER 70 WILL
  EVENTUALLY MAKE ITS WAY OVER THE NEEDLES HIGHWAY BETWEEN NEEDLES
  AND BIG BEND. THIS FLOODING IN THE PIUTE WASH WAS CAUSED BY
  EXTENSIVE HEAVY RAINFALL FROM THUNDERSTORMS LAST EVENING AND WILL
  CONTINUE TO FLOW THROUGH AT LEAST 9 AM. FLASH FLOODING IS EXPECTED
  TO BEGIN SHORTLY ACROSS THE NEEDLES HIGHWAY

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  NEEDLES HIGHWAY NORTH OF NEEDLES
  HIGHWAY 95 NEAR MILE MARKER 70

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TURN AROUND...DON'T DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

&&

LAT...LON 3507 11490 3508 11481 3495 11474 3497 11463
      3490 11463 3488 11476

$$

JA
2 follow-up statements
142 
WGUS75 KVEF 271403
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
703 AM PDT SAT AUG 27 2016

CAC071-271600-
/O.CON.KVEF.FF.W.0116.000000T0000Z-160827T1600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
703 AM PDT SAT AUG 27 2016

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 900 AM PDT FOR
EAST CENTRAL SAN BERNARDINO COUNTY...

RIVER ROAD NORTH OF NEEDLES IS EXPECTED TO SEE FLASH FLOODING FROM
HIGH WATER MOVING DOWN THE PIUTE WASH. THE CALIFORNIA HIGHWAY PATROL
REPORTED DEEP WATER ON HIGHWAY 95 NEAR MILE MARKER 70. THE SAME WASH
WILL CARRY FLOOD WATER ACROSS RIVER ROAD THROUGH AT LEAST 9 AM.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TURN AROUND...DON'T DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

&&

LAT...LON 3507 11490 3508 11481 3495 11474 3497 11463
      3490 11463 3488 11476

$$

JA
080 
WGUS75 KVEF 271557
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
857 AM PDT SAT AUG 27 2016

CAC071-271605-
/O.EXP.KVEF.FF.W.0116.000000T0000Z-160827T1600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
857 AM PDT SAT AUG 27 2016

...THE FLASH FLOOD WARNING FOR EAST CENTRAL SAN BERNARDINO COUNTY
WILL EXPIRE AT 900 AM PDT...

ANOTHER ROUND OF SHOWERS IS IMPACTING THE AREA.  HOWEVER,
THESESHOWERS ARE LIGHT AND SHOULD NOT CONTRIBUTE TO ADDITIONAL
FLOODING. FLOODING IS NO LONGER EXPECTED TO POSE A THREAT. PLEASE
CONTINUE TO HEED ANY REMAINING ROAD CLOSURES.

LAT...LON 3507 11490 3508 11481 3495 11474 3497 11463
      3490 11463 3488 11476

$$

DSB

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 26, 9:23 PM PDTSevere Thunderstorm WarningVEFSan Bernardino52 min
Aug 26, 9:26 PM PDTFlash Flood WarningVEFSan Bernardino3 hr
Aug 26, 9:40 PM PDTSevere Thunderstorm WarningVEFSan Bernardino35 min
Aug 26, 9:44 PM PDTFlash Flood WarningVEFInyo, San Bernardino3 hr
Aug 26, 10:01 PM PDTFlash Flood WarningVEFSan Bernardino3 hr
Aug 26, 10:07 PM PDTSevere Thunderstorm WarningVEFSan Bernardino38 min
Aug 26, 10:35 PM PDTFlash Flood WarningVEFSan Bernardino3 hr
Aug 26, 10:50 PM PDTSevere Thunderstorm WarningVEFSan Bernardino40 min
Aug 27, 4:04 PM PDTFlash Flood WarningVEFSan Bernardino3 hr

Nearby

Flash Flood Warnings in California, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.