Alert archive / California / Flash Flood Warnings in 2014

Flash Flood Warning 2, NWS San Diego, CA

February 28, 2014Orange County, Riverside County, San Diego County, California

NWS San Diego, CA issued this flash flood warning at Feb 28, 2014, 11:07 AM PST for Orange County, Riverside County, San Diego County, California. It was in force for 53 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: Feb 28, 2014, 11:07 AM PST (19:07 UTC)
Expired: Feb 28, 2014, 12:00 PM PST
In force: 53 min
Issued by: NWS San Diego, CA
Area: Storm-based polygon
Flood severity: None

Counties Orange County, CA, Riverside County, CA, San Diego County, CA

The radar

The Santa Ana Mts radar (KSOX), 36 km from the middle of the area, began a volume at 19:06 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, 7.1 hours before the alert went out and 88 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: 708 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 231 m²/s²
0-3 km storm-relative helicity: 400 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.

399 
WGUS56 KSGX 281907
FFWSGX
CAC059-065-073-282000-
/O.NEW.KSGX.FF.W.0002.140228T1907Z-140228T2000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN DIEGO CA
1107 AM PST FRI FEB 28 2014

THE NATIONAL WEATHER SERVICE IN SAN DIEGO HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHWESTERN RIVERSIDE COUNTY IN SOUTHERN CALIFORNIA...
  EAST CENTRAL ORANGE COUNTY IN SOUTHWEST CALIFORNIA...
  EXTREME NORTHWESTERN SAN DIEGO COUNTY IN SOUTHWEST CALIFORNIA...

* UNTIL NOON PST

* AT 1100 AM PST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  FLASH FLOODING FROM A THUNDERSTORM 6 MILES NORTHEAST OF RANCHO   
SANTA MARGARITA...OR 9 MILES NORTHEAST OF MISSION VIEJO. THE STORM   
PRODUCING FLASH FLOODING WAS MOVING SLOWLY EAST.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO THE 
FALLS FIRE BURN AREA INTO PARTS OF LAKE ELSINORE AND LAKELAND VILLAGE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

WATERSHEDS BURNED IN 2013 WITHIN THE FALLS BURN AREA ARE PARTICULARLY
SUSCEPTIBLE TO FLASH FLOODS AND DEBRIS FLOWS FROM THIS RAINSTORM.
STRUCTURES...ROADS...TRAILS...AND CAMPGROUNDS LOCATED ALONG DRAINAGES
WITHIN OR BELOW THE BURNED BASINS CAN BE IMPACTED BY FLASH FLOODS AND
DEBRIS FLOWS. THIS INCLUDES...BUT IS NOT RESTRICTED TO...THOSE NEAR
HIGHWAY 74...AND ALL HOMES...ROADS AND STRUCTURES LOCATED BELOW THE
BURN AREA ON BOTH SIDES OF GRAND AVENUE BETWEEN MACY STREET AND SANTA
ROSA DRIVE. FOR MORE INFORMATION ON POST-FIRE DEBRIS FLOWS AND WHAT
TO DO IF YOU LIVE NEAR A RECENTLY BURNED AREA...GO TO
LANDSLIDES.USGS.GOV/RESEARCH/WILDFIRE/

RESIDENTS AND MOTORISTS IN AND BELOW RECENTLY BURNED AREAS SHOULD BE
ALERT TO HEAVY MUD AND DEBRIS FLOWS WHICH MAY BLOCK ROADS AND
CULVERTS. POTENTIALLY DANGEROUS FLOODING AND PROPERTY LOSS COULD RESULT 
IN AREAS WHERE RUNOFF IS RESTRICTED OR BLOCKED. 

&&

LAT...LON 3375 11743 3354 11717 3343 11718 3332 11735
      3370 11765

$$

MM

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 28, 4:04 AM PST	Flash Flood Watch	SGX	Orange, Riverside, San Bernardino, San Diego	40 hr
Feb 28, 6:19 AM PST	Areal Flood Advisory	SGX	Riverside, San Bernardino	12 hr
Feb 28, 9:19 AM PST	Special Marine Warning	SGX		41 min
Feb 28, 9:45 AM PST	Areal Flood Advisory	SGX	Orange, Riverside, San Bernardino, San Diego	3 hr
Feb 28, 9:59 AM PST	Special Marine Warning	SGX		61 min
Feb 28, 10:18 AM PST	Areal Flood Advisory	SGX	Orange, Riverside, San Bernardino, San Diego	3 hr
Feb 28, 10:37 AM PST	Flash Flood Warning	SGX	Riverside, San Bernardino	3 hr
Feb 28, 10:59 AM PST	Special Marine Warning	SGX		46 min
Feb 28, 11:59 AM PST	Flash Flood Warning	SGX	Orange, Riverside, San Diego	61 min
Feb 28, 1:18 PM PST	Areal Flood Advisory	SGX	Orange, Riverside, San Bernardino, San Diego	87 min
Feb 28, 2:31 PM PST	Areal Flood Advisory	SGX	Orange, Riverside, San Bernardino, San Diego	3 hr
Feb 28, 3:06 PM PST	Areal Flood Advisory	SGX	Riverside, San Bernardino, San Diego	3 hr
Feb 28, 3:18 PM PST	Flash Flood Warning	SGX	Orange, Riverside	57 min
Feb 28, 3:40 PM PST	Flash Flood Warning	SGX	San Bernardino	95 min
Feb 28, 3:50 PM PST	Special Weather Statement	SGX	San Diego	55 min

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.