Alert archive / California / Flash Flood Warnings in 2016

Flash Flood Warning 79, NWS Las Vegas, NV

August 4, 2016San Bernardino County, California

NWS Las Vegas, NV issued this flash flood warning at Aug 4, 2016, 3:25 PM PDT for San Bernardino County, California. 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
Aug 4, 2016, 3:25 PM PDT (22:25 UTC)
Expired
Aug 4, 2016, 6:30 PM PDT
In force
3 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), 169 km from the middle of the area, began a volume at 22:26 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

San Diego, CA (KNKX), launched 12:00Z, 10.4 hours before the alert went out and 224 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, San Diego, CA at 12:00Z on 2016-08-04Temperature 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°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, San Diego, CA at 12:00Z on 2016-08-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 4 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1135 m above ground
0-6 km bulk shear
13 kt
0-1 km storm-relative helicity
4 m²/s²
0-3 km storm-relative helicity
10 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

492 
WGUS55 KVEF 042225
FFWVEF
CAC071-050130-
/O.NEW.KVEF.FF.W.0079.160804T2225Z-160805T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
325 PM PDT THU AUG 4 2016

THE NATIONAL WEATHER SERVICE IN LAS VEGAS  HAS ISSUED A

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

* UNTIL 630 PM PDT

* AT 324 PM PDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING
  HEAVY RAIN ACROSS THE WARNED AREA...ESPECIALLY ALONG AMBOY ROAD
  SOUTH OF AMBOY. FLASH FLOODING IS EXPECTED TO BEGIN SHORTLY.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  AMBOY...AMBOY ROAD...STATE ROUTE 62 EAST OF TWENTYNINE PALMS.

LAT...LON 3411 11549 3447 11617 3460 11604 3460 11542
      3408 11508 3407 11532

$$

WOLCOTT
2 follow-up statements
367 
WGUS75 KVEF 050006
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
506 PM PDT THU AUG 4 2016

CAC071-050130-
/O.CON.KVEF.FF.W.0079.000000T0000Z-160805T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
506 PM PDT THU AUG 4 2016

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 630 PM PDT FOR
SOUTH CENTRAL SAN BERNARDINO COUNTY...

AT 504 PM PDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING
HEAVY RAIN WERE ENDING ACROSS THE WARNED AREA.  FLASH FLOODING IS
LIKELY ONGOING IN THE AREA.

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
AMBOY. AMBOY ROAD BETWEEN STATE ROUTE 62 AND AMBOY. AS WELL AS STATE
ROUTE 62  BETWEEN MILE MARKERS 69 AND 92.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3411 11549 3447 11617 3460 11604 3460 11542
      3408 11508 3407 11532

$$

WOLCOTT
796 
WGUS75 KVEF 050124
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
624 PM PDT THU AUG 4 2016

CAC071-050134-
/O.EXP.KVEF.FF.W.0079.000000T0000Z-160805T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
624 PM PDT THU AUG 4 2016

...THE FLASH FLOOD WARNING FOR SOUTH CENTRAL SAN BERNARDINO COUNTY
WILL EXPIRE AT 630 PM PDT...

THE HEAVY RAIN HAS ENDED OVER CENTRAL SAN BERNARDINO COUNTY.
FLOODING IS NO LONGER EXPECTED TO POSE A THREAT. PLEASE CONTINUE TO
HEED ANY REMAINING ROAD CLOSURES.

LAT...LON 3411 11549 3447 11617 3460 11604 3460 11542
      3408 11508 3407 11532

$$

WOLCOTT

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 3, 6:20 PM PDTFlash Flood WarningVEFSan Bernardino3 hr
Aug 3, 8:40 PM PDTFlash Flood WarningVEFSan Bernardino6 hr
Aug 4, 12:37 AM PDTFlash Flood WarningVEFSan Bernardino113 min
Aug 4, 2:24 AM PDTFlash Flood WarningVEFSan Bernardino2 hr
Aug 4, 1:49 PM PDTFlash Flood WarningVEFSan Bernardino3 hr
Aug 4, 4:39 PM PDTAreal Flood AdvisoryVEFSan Bernardino5 hr
Aug 4, 4:42 PM PDTAreal Flood AdvisoryVEFSan 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.