Alert archive / California / Flash Flood Warnings in 2015

Flash Flood Warning 2, NWS Las Vegas, NV

May 4, 2015San Bernardino County, California

NWS Las Vegas, NV issued this flash flood warning at May 4, 2015, 6:03 PM PDT for San Bernardino County, California. It was in force for 117 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
May 4, 2015, 6:03 PM PDT (01:03 UTC)
Expired
May 4, 2015, 8:00 PM PDT
In force
117 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), 178 km from the middle of the area, began a volume at 01:03 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, 1.1 hours before the alert went out and 182 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 2015-05-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 399 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 2015-05-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 36 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
399 J/kg
Mixed-layer CIN
-23 J/kg
Mixed-layer LCL
1702 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
36 m²/s²
0-3 km storm-relative helicity
73 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

329 
WGUS55 KVEF 050103
FFWVEF
CAC071-050300-
/O.NEW.KVEF.FF.W.0002.150505T0103Z-150505T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
603 PM PDT MON MAY 4 2015

THE NATIONAL WEATHER SERVICE IN LAS VEGAS  HAS ISSUED A

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

* UNTIL 800 PM PDT

* AT 601 PM PDT...DOPPLER RADAR INDICATED THUNDERSTORMS WITH HEAVY 
  RAIN ALONG HIGHWAY 62 FROM MILE MARKER 112 TO THE ARIZONA STATE 
  LINE. FLASH FLOODING WILL BE POSSIBLE ON THE HIGHWAY THROUGH 8   
  PM.

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

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.

&&

LAT...LON 3413 11478 3426 11452 3417 11429 3414 11432
      3413 11435 3412 11437 3411 11441 3408 11444
      3408 11476

$$

MORGAN
1 follow-up statement
451 
WGUS75 KVEF 050257
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
757 PM PDT MON MAY 4 2015

CAC071-050305-
/O.EXP.KVEF.FF.W.0002.000000T0000Z-150505T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
757 PM PDT MON MAY 4 2015

...THE FLASH FLOOD WARNING FOR SOUTHEASTERN SAN BERNARDINO COUNTY
WILL EXPIRE AT 800 PM PDT...

THE HEAVY RAIN HAS ENDED. A FEW LIGHT SHOWERS REMAIN ACROSS THE AREA 
BUT RAINFALL AMOUNTS WILL BE RATHER LIGHT. FLOODING IS NO LONGER 
EXPECTED TO POSE A THREAT. 

LAT...LON 3413 11478 3426 11452 3417 11429 3414 11432
      3413 11435 3412 11437 3411 11441 3408 11444
      3408 11476

$$

MP

Nearby

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