Alert archive / California / Flash Flood Warnings in 2016

Flash Flood Warning 94, NWS Las Vegas, NV

August 18, 2016San Bernardino County, California

NWS Las Vegas, NV issued this flash flood warning at Aug 18, 2016, 9:06 PM PDT for San Bernardino County, California. It was in force for 114 min. 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 18, 2016, 9:06 PM PDT (04:06 UTC)
Expired
Aug 18, 2016, 11:00 PM PDT
In force
114 min
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), 177 km from the middle of the area, began a volume at 04:08 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

Yuma Prvg Ground, AZ (K1Y7), launched 00:00Z, 4.1 hours before the alert went out and 186 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, Yuma Prvg Ground, AZ at 00:00Z on 2016-08-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 124 joules per kilogram.LCLLFCEL10008507005003002001001 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, Yuma Prvg Ground, AZ at 00:00Z on 2016-08-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -1 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
124 J/kg
Mixed-layer CIN
-82 J/kg
Mixed-layer LCL
3543 m above ground
0-6 km bulk shear
4 kt
0-1 km storm-relative helicity
-1 m²/s²
0-3 km storm-relative helicity
1 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

635 
WGUS55 KVEF 190406
FFWVEF
CAC071-190600-
/O.NEW.KVEF.FF.W.0094.160819T0406Z-160819T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
906 PM PDT THU AUG 18 2016

THE NATIONAL WEATHER SERVICE IN LAS VEGAS  HAS ISSUED A

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

* UNTIL 1100 PM PDT

* AT 905 PM PDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING
  HEAVY RAIN IN THE BIG RIVER AND EARP AREAS. FLASH FLOODING IS
  EXPECTED TO BEGIN SHORTLY.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  EARP AND BIG RIVER. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING.

&&

LAT...LON 3427 11456 3427 11421 3421 11421 3417 11425
      3417 11429 3414 11432 3413 11435 3412 11437
      3411 11441 3408 11444 3408 11456

$$

MORGAN
2 follow-up statements
119 
WGUS75 KVEF 190452
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
952 PM PDT THU AUG 18 2016

CAC071-190600-
/O.CON.KVEF.FF.W.0094.000000T0000Z-160819T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
952 PM PDT THU AUG 18 2016

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1100 PM PDT FOR
SOUTHEASTERN SAN BERNARDINO COUNTY...

AT 951 PM PDT...DOPPLER RADAR INDICATED THAT RAIN WAS TAPERING OFF
IN THE EARP AND BIG RIVER AREA. HOWEVER, HEAVY RAIN FELL A BIT
EARLIER, AND WATER MAY STILL BE FLOWING.

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
EARP AND BIG RIVER. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING.

&&

LAT...LON 3427 11456 3427 11421 3421 11421 3417 11425
      3417 11429 3414 11432 3413 11435 3412 11437
      3411 11441 3408 11444 3408 11456

$$

MORGAN
980 
WGUS75 KVEF 190552
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
1052 PM PDT THU AUG 18 2016

CAC071-190600-
/O.EXP.KVEF.FF.W.0094.000000T0000Z-160819T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
1052 PM PDT THU AUG 18 2016

...THE FLASH FLOOD WARNING FOR SOUTHEASTERN SAN BERNARDINO COUNTY
WILL EXPIRE AT 1100 PM PDT...

MOST OF THE HEAVY RAIN HAS ENDED IN THE BIG RIVER AND EARP AREA, BUT
ONE MORE SMALL STORM COULD PASS THROUGH BEFORE MIDNIGHT. PLEASE
CONTINUE TO BE ALERT FOR WATER RUNNING OVER THE ROADS, AND HEED ANY
REMAINING ROAD CLOSURES.

LAT...LON 3427 11456 3427 11421 3421 11421 3417 11425
      3417 11429 3414 11432 3413 11435 3412 11437
      3411 11441 3408 11444 3408 11456

$$

MORGAN

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 18, 5:26 PM PDTFlash Flood WarningVEFSan Bernardino2 hr
Aug 18, 7:21 PM PDTFlash Flood WarningVEFSan Bernardino3 hr
Aug 19, 2:44 PM PDTFlash Flood WarningVEFSan Bernardino3 hr
Aug 19, 4:41 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.