Alert archive / California / Flash Flood Warnings in 2016

Flash Flood Warning 93, NWS Las Vegas, NV

August 18, 2016San Bernardino County, California

NWS Las Vegas, NV issued this flash flood warning at Aug 18, 2016, 7:21 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 18, 2016, 7:21 PM PDT (02:21 UTC)
Expired
Aug 18, 2016, 10:15 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), 138 km from the middle of the area, began a volume at 02:22 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, 2.4 hours before the alert went out and 221 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.

329 
WGUS55 KVEF 190221
FFWVEF
CAC071-190515-
/O.NEW.KVEF.FF.W.0093.160819T0221Z-160819T0515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
721 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 1015 PM PDT

* AT 720 PM PDT...DOPPLER RADAR INDICATED THUNDERSTORMS PERSISTING
  OVER HIGHWAY 95 BETWEEN MILE MARKERS 28 AND 35. FLASH FLOODING IS
  ALREADY OCCURRING AND WILL CONTINUE THROUGH THE EVENING.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  HIGHWAY 95 AT MILE MARKER 29.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3454 11458 3442 11455 3438 11472 3449 11474

$$

MORGAN
2 follow-up statements
579 
WGUS75 KVEF 190327
FFSVEF

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

CAC071-190515-
/O.CON.KVEF.FF.W.0093.000000T0000Z-160819T0515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
827 PM PDT THU AUG 18 2016

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1015 PM PDT FOR
SOUTHEASTERN SAN BERNARDINO COUNTY...

AT 825 PM PDT...DOPPLER RADAR INDICATED HEAVY RAIN PERSISTING ON
HIGHWAY 95. THE CALIFORNIA HIGHWAY PATROL REPORTED THAT THE HIGHWAY
WILL BE CLOSED AT INTERSTATE 40.

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
HIGHWAY 95 AT MILE MARKER 29.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3454 11458 3442 11455 3438 11472 3449 11474

$$

MORGAN
612 
WGUS75 KVEF 190506
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
1006 PM PDT THU AUG 18 2016

CAC071-190515-
/O.EXP.KVEF.FF.W.0093.000000T0000Z-160819T0515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
1006 PM PDT THU AUG 18 2016

...THE FLASH FLOOD WARNING FOR SOUTHEASTERN SAN BERNARDINO COUNTY
WILL EXPIRE AT 1015 PM PDT...

THE HEAVY RAIN HAS ENDED. HOWEVER, AS OF LAST REPORT, HIGHWAY 95 WAS
IMPASSABLE AND CLOSED. PLEASE CONTINUE TO HEED ANY REMAINING ROAD
CLOSURES.

LAT...LON 3454 11458 3442 11455 3438 11472 3449 11474

$$

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, 9:06 PM PDTFlash Flood WarningVEFSan Bernardino114 min
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.