Alert archive / California / Flash Flood Warnings in 2014

Flash Flood Warning 9, NWS San Diego, CA

July 5, 2014San Bernardino County, California

NWS San Diego, CA issued this flash flood warning at Jul 5, 2014, 10:44 AM 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: Jul 5, 2014, 10:44 AM PDT (17:44 UTC)
Expired: Jul 5, 2014, 1:30 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 Santa Ana Mts radar (KSOX), 105 km from the middle of the area, began a volume at 17:47 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, 5.7 hours before the alert went out and 171 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1900 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: 13 m²/s²
0-3 km storm-relative helicity: -6 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.

555 
WGUS56 KSGX 051744
FFWSGX
CAC071-052030-
/O.NEW.KSGX.FF.W.0009.140705T1744Z-140705T2030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN DIEGO CA
1044 AM PDT SAT JUL 5 2014

THE NATIONAL WEATHER SERVICE IN SAN DIEGO HAS ISSUED A

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

* UNTIL 130 PM PDT

* AT 1030 AM PDT...STRONG THUNDERSTORMS CAPABLE OF FLASH FLOODING    
  HAVE DEVELOPED EAST OF BIG BEAR LAKE. THE STORMS WERE NEARLY       
  STATIONARY.

* OTHER LOCATIONS IN THE WARNING INCLUDE THE NORTH SLOPE OF THE SAN  
  BERNARDINO MOUNTAINS SOUTHWEST OF JOHNSON VALLEY INCLUDING         
  PORTIONS OF HIGHWAY 247.

LAT...LON 3434 11644 3432 11648 3429 11646 3405 11674
      3407 11710 3444 11675

$$

JAD

3 follow-up statements

908 
WGUS76 KSGX 051817
FFSSGX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN DIEGO CA
1117 AM PDT SAT JUL 5 2014

CAC071-052030-
/O.CON.KSGX.FF.W.0009.000000T0000Z-140705T2030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
1117 AM PDT SAT JUL 5 2014

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 130 PM PDT FOR SOUTH
CENTRAL SAN BERNARDINO COUNTY...

AT 1106 AM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE THUNDERSTORMS EAST OF BIG BEAR LAKE...OR 27 MILES NORTHEAST 
OF YUCAIPA...WHICH ARE LIKELY PRODUCING FLASH FLOODING. EXPECT 
PORTIONS OF HIGHWAY 247 TO BE IMPACTED. THE THUNDERSTORMS WERE 
DRIFTING SLOWLY NORTHEAST.

RADAR ESTIMATES ONE TO TWO INCHES OF RAIN HAS FALLEN IN A SWATH FROM 
NEAR ONYX PEAK TO 6 MILES EAST OF BIG BEAR LAKE...AND ONTO THE NORTH 
SLOPES OF THE MOUNTAINS.  

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE
BANKS OF CREEKS AND STREAMS.

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.

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 3434 11644 3432 11648 3429 11646 3405 11674
      3407 11710 3444 11675

$$

JAD

580 
WGUS76 KSGX 051902
FFSSGX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN DIEGO CA
1202 PM PDT SAT JUL 5 2014

CAC071-052030-
/O.CON.KSGX.FF.W.0009.000000T0000Z-140705T2030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
1202 PM PDT SAT JUL 5 2014

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 130 PM PDT FOR SOUTH
CENTRAL SAN BERNARDINO COUNTY...

AT 1148 AM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE FLASH FLOOD PRODUCING THUNDERSTORMS 10 MILES NORTHEAST OF 
BIG BEAR LAKE AND NEAR JOHNSON VALLEY. THE THUNDERSTORMS WERE 
DRIFTING SLOWLY NORTH.

CALTRANS REPORTS HIGHWAY 247 HAS BEEN WASHED OUT AND IS CURRENTLY 
CLOSED AT RECHE ROAD NORTH OF YUCCA VALLEY. 

RADAR HAS INDICATED A DECREASE IN THE INTENSITY OF THE RAIN OVER THE 
SAN BERNARDINO MOUNTAINS...BUT AN INCREASE FARTHER NORTH TOWARD 
JOHNSON VALLEY. OVER TWO INCHES OF RAIN MAY HAVE FALLEN IN SOME 
SPOTS SO HEAVY RUNOFF WILL LIKELY CONTINUE THROUGH 130 PM PDT IN 
THESE AREAS.  

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.

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 3434 11644 3432 11648 3429 11646 3405 11674
      3407 11710 3444 11675

$$

JAD

460 
WGUS76 KSGX 052022
FFSSGX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN DIEGO CA
122 PM PDT SAT JUL 5 2014

CAC071-052031-
/O.EXP.KSGX.FF.W.0009.000000T0000Z-140705T2030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
122 PM PDT SAT JUL 5 2014

...THE FLASH FLOOD WARNING WILL EXPIRE AT 130 PM PDT FOR SOUTH
CENTRAL SAN BERNARDINO COUNTY...

THUNDERSTORMS HAVE MOVED OUT OF THE WARNING AREA AND ANY RUNOFF HAS 
ENDED OR WILL BE SUBSIDING RAPIDLY MOST AREAS.


LAT...LON 3434 11644 3432 11648 3429 11646 3405 11674
      3407 11710 3444 11675

$$

JAD

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 4, 5:01 PM PDT	Flash Flood Warning	SGX	San Bernardino	3 hr
Jul 5, 3:38 AM PDT	Areal Flood Advisory	SGX	Riverside	3 hr
Jul 5, 4:57 AM PDT	Areal Flood Advisory	SGX	San Bernardino	3 hr
Jul 5, 9:53 AM PDT	Flash Flood Watch	SGX	Riverside, San Bernardino, San Diego	7 hr
Jul 5, 12:43 PM PDT	Special Weather Statement	SGX	San Bernardino	47 min
Jul 5, 2:04 PM PDT	Flash Flood Warning	SGX	San Bernardino	3 hr

Nearby

Flash Flood Warnings in California, 2014 Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.