Alert archive / California / Flash Flood Warnings in 2014

Flash Flood Warning 7, NWS San Diego, CA

July 4, 2014San Bernardino County, California

NWS San Diego, CA issued this flash flood warning at Jul 4, 2014, 3:33 PM PDT for San Bernardino County, California. It was in force for 3 hr. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Jul 4, 2014, 3:33 PM PDT (22:33 UTC)
Expired
Jul 4, 2014, 6:30 PM PDT
In force
3 hr
Issued by
NWS San Diego, CA
Area
Storm-based polygon
Flood severity
None

County San Bernardino County, CA

The radar

The Edwards AFB radar (KEYX), 60 km from the middle of the area, began a volume at 22:33 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.

What was reported inside it

TimeReportWhereRemark
Jul 4, 4:03 PM PDTFLASH FLOOD12 N Apple Valley, CAHIGHWAY PATROL REPORTED FLASH FLOODING ON I-15 AND WILD WASH ROAD.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

San Diego, CA (KNKX), launched 12:00Z, 10.6 hours before the alert went out and 215 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 2014-07-04Temperature 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 2014-07-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -1 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
1673 m above ground
0-6 km bulk shear
8 kt
0-1 km storm-relative helicity
-1 m²/s²
0-3 km storm-relative helicity
-13 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.

371 
WGUS56 KSGX 042233
FFWSGX
CAC071-050130-
/O.NEW.KSGX.FF.W.0007.140704T2233Z-140705T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN DIEGO CA
333 PM PDT FRI JUL 4 2014

THE NATIONAL WEATHER SERVICE IN SAN DIEGO HAS ISSUED A

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

* UNTIL 630 PM PDT

* AT 324 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  VERY HEAVY RAIN AND POSSIBLE FLASH FLOODING FROM A THUNDERSTORM    
  12 MILES SOUTHWEST OF DAGGETT...AND 10 MILES NORTHEAST OF APPLE    
  VALLEY. THE STORM WAS NEARLY STATIONARY.

* AREAS IMPACTED INCLUDE HIGHWAY 247...NEW JACK CITY...LUCERNE       
  VALLEY CUTOFF ROAD...AND THE MOJAVE RIVER BED.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. MOVE TO HIGHER GROUND.

&&

LAT...LON 3479 11713 3477 11691 3477 11689 3465 11685
      3452 11715 3470 11727 3479 11725 3479 11718

$$

JMB
2 follow-up statements
022 
WGUS76 KSGX 042300
FFSSGX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN DIEGO CA
400 PM PDT FRI JUL 4 2014

CAC071-050130-
/O.CON.KSGX.FF.W.0007.000000T0000Z-140705T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
400 PM PDT FRI JUL 4 2014

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

AT 351 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE HEAVY RAIN CAPABLE OF PRODUCING FLASH FLOODING. STORMS WERE 
LOCATED ALONG BOTH THE INTERSTATE 15 AND HIGHWAY 247 
CORRIDORS...JUST SOUTH OF BARSTOW. THE THUNDERSTORMS WITH EXCESSIVE 
RAIN WERE NEARLY STATIONARY. RAINFALL AMOUNTS AROUND 2 INCHES HAVE 
ALREADY OCCURRED IN THE WARNING AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO
AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE USUALLY
DEEPER THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS POWERFUL
ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING FLOODED
ROADS MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.

&&

LAT...LON 3479 11713 3477 11691 3477 11689 3465 11685
      3452 11715 3470 11727 3479 11725 3479 11718

$$

JMB
077 
WGUS76 KSGX 042347
FFSSGX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN DIEGO CA
447 PM PDT FRI JUL 4 2014

CAC071-042357-
/O.CAN.KSGX.FF.W.0007.000000T0000Z-140705T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
447 PM PDT FRI JUL 4 2014

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR WEST CENTRAL SAN
BERNARDINO COUNTY...

THUNDERSTORMS HAVE DIMINISHED ACROSS THE WARNING AREA. THE HIGHWAY 
PATROL REPORTED FLASH FLOODING ALONG INTERSTATE 15 NEAR WILD WASH 
ROAD. 

LAT...LON 3479 11713 3477 11691 3477 11689 3465 11685
      3452 11715 3470 11727 3479 11725 3479 11718

$$

JMB

The office that day

Everything else NWS San Diego, CA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 4, 1:40 PM PDTSpecial Weather StatementSGX65 min
Jul 4, 1:50 PM PDTSpecial Weather StatementSGX55 min
Jul 4, 3:02 PM PDTAreal Flood AdvisorySGXSan Bernardino3 hr
Jul 4, 3:53 PM PDTAreal Flood AdvisorySGXSan Diego3 hr

Nearby

Flash Flood Warnings in California, 2014Every flash flood warning in 2014

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.