Alert archive / California / Flash Flood Warnings in 1997

Flash Flood Warning 21, NWS San Diego, CA

September 5, 1997San Diego County, California

NWS San Diego, CA issued this flash flood warning at Sep 5, 1997, 1:17 PM PDT for San Diego County, California. It was in force for 58 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Sep 5, 1997, 1:17 PM PDT (20:17 UTC)
Expired: Sep 5, 1997, 2:15 PM PDT
In force: 58 min
Issued by: NWS San Diego, CA
Area: Whole counties

County San Diego County, CA

The radar

The San Diego radar (KNKX), 28 km from the middle of the area, began a volume at 20:19 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, 8.3 hours before the alert went out and 47 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: 352 J/kg
Mixed-layer CIN: -462 J/kg
Mixed-layer LCL: 1263 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 29 m²/s²
0-3 km storm-relative helicity: 64 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.

000 
TTAA00 KSAN 052019
FFWSAN
CAC073-052115-
 
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM AND FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN DIEGO CA
117 PM PDT FRI SEP 5 1997
 
THE NATIONAL WEATHER SERVICE IN SAN DIEGO HAS ISSUED A
SEVERE THUNDERSTORM AND FLASH FLOOD WARNING
EFFECTIVE UNTIL  215 PM PDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN SOUTHWEST CALIFORNIA
 
   ...NORTHEASTERN SAN DIEGO COUNTY
 
DOPPLER RADAR AND SATELLITE INDICATED A SEVERE THUNDERSTORM ABOUT 5 MILESOUTH OF BORREGO SPRINGS...MOVING NORTHEAST AT ABOUT 15 MPH. THE THUNDER
OWILL AFFECT THE BORREGO SPRINGS AREA FOR THE NEXT HOUR AND CONTAIN HEAVY
RAIN...HAIL...AND DANGEROUS LIGHTNING. A SPOTTER IN BORREGO SPRINGS
HAS REPORTED A WIND GUST TO 55 MPH.
 
MOST DEATHS IN FLASH FLOODING OCCUR IN AUTOMOBILES.  DO NOT ATTEMPT TO
CROSS BRIDGES...DIPS...OR LOW SPOTS IF WATER COVERS THE ROADWAY.  NEVER
TRY TO CROSS A FLOWING STREAM...EVEN A SMALL ONE...ON FOOT.
 
THIS IS A DANGEROUS STORM.  IF YOU ARE IN ITS PATH YOU SHOULD
PREPARE FOR DAMAGING WIND IN EXCESS OF 55 MPH...LARGE HAIL...AND
DEADLY LIGHTNING.  PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT STAY AWAY FROM WINDOWS.
 
SMAfLL

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 4, 5:30 PM PDT	Flash Flood Warning	SGX	San Bernardino	30 min
Sep 4, 5:30 PM PDT	Severe Thunderstorm Warning	SGX	San Bernardino	30 min
Sep 4, 6:02 PM PDT	Flash Flood Warning	SGX	San Bernardino	28 min
Sep 4, 6:02 PM PDT	Severe Thunderstorm Warning	SGX	San Bernardino	28 min
Sep 4, 6:30 PM PDT	Flash Flood Warning	SGX	San Bernardino	30 min
Sep 5, 1:17 PM PDT	Severe Thunderstorm Warning	SGX	San Diego	58 min
Sep 5, 2:12 PM PDT	Flash Flood Warning	SGX	San Diego	63 min
Sep 5, 2:12 PM PDT	Severe Thunderstorm Warning	SGX	San Diego	63 min
Sep 5, 2:24 PM PDT	Flash Flood Warning	SGX	Riverside	66 min
Sep 5, 2:24 PM PDT	Severe Thunderstorm Warning	SGX	Riverside	66 min
Sep 5, 3:15 PM PDT	Flash Flood Warning	SGX	San Diego	60 min
Sep 5, 3:15 PM PDT	Severe Thunderstorm Warning	SGX	San Diego	60 min
Sep 5, 3:27 PM PDT	Flash Flood Warning	SGX	Riverside	63 min
Sep 5, 3:27 PM PDT	Severe Thunderstorm Warning	SGX	Riverside	63 min
Sep 5, 4:14 PM PDT	Flash Flood Warning	SGX	San Diego	61 min
Sep 5, 4:14 PM PDT	Severe Thunderstorm Warning	SGX	San Diego	61 min

Nearby

Flash Flood Warnings in California, 1997 Every flash flood warning in 1997

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.