Alert archive / California / Flash Flood Warnings in 2014

Flash Flood Warning 13, NWS San Diego, CA

July 28, 2014San Bernardino County, California

NWS San Diego, CA issued this flash flood warning at Jul 28, 2014, 12:39 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: Jul 28, 2014, 12:39 PM PDT (19:39 UTC)
Expired: Jul 28, 2014, 3:45 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), 94 km from the middle of the area, began a volume at 19:42 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, 7.7 hours before the alert went out and 172 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: 1683 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 6 m²/s²
0-3 km storm-relative helicity: 23 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.

052 
WGUS56 KSGX 281939
FFWSGX
CAC071-282245-
/O.NEW.KSGX.FF.W.0013.140728T1939Z-140728T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN DIEGO CA
1239 PM PDT MON JUL 28 2014

THE NATIONAL WEATHER SERVICE IN SAN DIEGO HAS ISSUED A

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

* UNTIL 345 PM PDT.

* AT 1230 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  FLASH FLOODING FROM A THUNDERSTORM NEAR BIG BEAR CITY...OR 22 MILES
  NORTHEAST OF YUCAIPA. THE STORM PRODUCING FLASH FLOODING WAS NEARLY
  STATIONARY.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  LUCERNE VALLEY AND JOHNSON VALLEY.


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.

&&

LAT...LON 3417 11665 3406 11682 3416 11700 3437 11702
      3447 11697 3451 11692 3449 11664 3442 11656

$$

PG

3 follow-up statements

361 
WGUS76 KSGX 282012
FFSSGX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN DIEGO CA
112 PM PDT MON JUL 28 2014

CAC071-282245-
/O.CON.KSGX.FF.W.0013.000000T0000Z-140728T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
112 PM PDT MON JUL 28 2014

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 345 PM PDT FOR SOUTH
CENTRAL SAN BERNARDINO COUNTY...

AT 105 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A THUNDERSTORM NEAR BIG BEAR CITY...OR 20 MILES NORTHEAST OF
YUCAIPA...WHICH IS LIKELY PRODUCING FLASH FLOODING. THE THUNDERSTORM
WAS NEARLY STATIONARY.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO LUCERNE
VALLEY...JOHNSON VALLEY...AND PORTIONS OF HIGHWAYS 18...38 AND 247.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DEBRIS FLOWS...INCLUDING MUD AND ROCK SLIDES...ARE EXPECTED WITH THIS
STORM. MUD SLIDES AND ROCK SLIDES CAN POTENTIALLY TRAP AND KILL
PEOPLE CAUGHT IN THEIR PATH.

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.

TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY
YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN SAN
DIEGO.

&&

LAT...LON 3417 11665 3406 11682 3416 11700 3437 11702
      3447 11697 3451 11692 3449 11664 3442 11656

$$

PG

304 
WGUS76 KSGX 282129
FFSSGX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN DIEGO CA
229 PM PDT MON JUL 28 2014

CAC071-282245-
/O.CON.KSGX.FF.W.0013.000000T0000Z-140728T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
229 PM PDT MON JUL 28 2014

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 345 PM PDT FOR SOUTH
CENTRAL SAN BERNARDINO COUNTY...

AT 218 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THE 
STORM THAT WAS PRODUCING HEAVY RAIN EARLIER AND WAS CAPABLE OF 
PRODUCING FLASH FLOODING HAS WEAKENED. HOWEVER...FLASH FLOODING WILL 
STILL BE POSSIBLE THROUGH THE NEXT HOUR. THIS STORM IS NOW PRODUCING 
LIGHT TO MODERATE RAINFALL...AND WAS LOCATED NEAR BIG BEAR CITY...OR 
20 MILES NORTHEAST OF YUCAIPA. THE THUNDERSTORM WAS NEARLY 
STATIONARY.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO LUCERNE
VALLEY AND JOHNSON VALLEY...AND HIGHWAYS 247...38 AND 18.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DEBRIS FLOWS...INCLUDING MUD AND ROCK SLIDES...ARE EXPECTED WITH THIS
STORM. MUD SLIDES AND ROCK SLIDES CAN POTENTIALLY TRAP AND KILL
PEOPLE CAUGHT IN THEIR PATH.

PLEASE REPORT FLASH FLOODING AND DAMAGE FROM FLASH FLOODS TO THE
NATIONAL WEATHER SERVICE SAN DIEGO TWITTER AND FACEBOOK PAGES.

&&

LAT...LON 3417 11665 3406 11682 3416 11700 3437 11702
      3447 11697 3451 11692 3449 11664 3442 11656

$$

JJT

924 
WGUS76 KSGX 282237
FFSSGX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN DIEGO CA
337 PM PDT MON JUL 28 2014

CAC071-282247-
/O.EXP.KSGX.FF.W.0013.000000T0000Z-140728T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
337 PM PDT MON JUL 28 2014

...THE FLASH FLOOD WARNING WILL EXPIRE AT 345 PM PDT FOR SOUTH
CENTRAL SAN BERNARDINO COUNTY...

THUNDERSTORMS HAVE DISSIPATED AND ONLY LIGHT RAIN SHOWERS REMAIN. 
THE SHOWERS CONTINUE TO WEAKEN.

LAT...LON 3417 11665 3406 11682 3416 11700 3437 11702
      3447 11697 3451 11692 3449 11664 3442 11656

$$

PG

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 27, 6:25 PM PDT	Special Weather Statement	SGX		50 min
Jul 28, 12:32 PM PDT	Areal Flood Advisory	SGX	San Diego	3 hr
Jul 28, 1:53 PM PDT	Areal Flood Advisory	SGX	Riverside	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.