Alert archive / California / Flash Flood Warnings in 1989
Flash Flood Warning 2, NWS San Diego, CA
NWS San Diego, CA issued this flash flood warning at Aug 9, 1989, 4:00 PM PDT for Imperial County, California. It was in force for 3 hr.
The area
The counties it named.
The facts
- Issued
- Aug 9, 1989, 4:00 PM PDT (23:00 UTC)
- Expired
- Aug 9, 1989, 7:00 PM PDT
- In force
- 3 hr
- Issued by
- NWS San Diego, CA
- Area
- Whole counties
County Imperial County, CA
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
The nearest sounding before it
San Diego, CA (KNKX), launched 12:00Z, 11.0 hours before the alert went out and 173 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 3639 m above ground
- 0-6 km bulk shear
- 4 kt
- 0-1 km storm-relative helicity
- 15 m²/s²
- 0-3 km storm-relative helicity
- 59 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KLAX 092318 FFWLAX CAC025-065-100200- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM AND FLASH FLOOD WARNING NATIONAL WEATHER SERVICE LOS ANGELES CA 4 PM PDT WED AUG 9 1989 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM AND FLASH FLOOD WARNING EFFECTIVE UNTIL 7 PM PDT FOR PEOPLE IN THE FOLLOWING COUNTIES OF: EXTREME SOUTHEASTERN RIVERSIDE EXTREME NORTHEASTERN IMPERIAL AT 4 PM RADAR INDICATED A STRONG THUNDERSTORM WAS CROSSING THE ARIZONA BORDER NEAR PALO VERDE AND WAS MOVING INTO CALIFORNIA. THE WARNING INCLUDES AREAS FROM DESERT CENTER TO BLYTHE SOUTH TO THE PALO VERDE MOUNTAINS. THE STORM IS MOVING TOWARDS THE NORTHWEST AT 15 MPH. THIS STORM IS EXPECTED TO BRING STRONG WINDS GUSTING TO 60 MPH OR MORE AND HEAVY RAIN...FOR THE NEXT FEW HOURS. THIS HEAVY RAIN WILL LIKELY CAUSE LOCAL FLASH FLOODING IN THE WARNING AREA. IF YOU ARE DRIVING IN THE WARNING AREA USE EXTRA CAUTION...AVOID FLOODED HIGHWAY DIPS...AND BE 7AWARE THAT THE STRONG WINDS MAY REDUCE VISIBILITIES TO NEAR ZERO. IF YOU ARE OUTSIDE AND THREATENING WEATHER APPROACHES GO TO A SAFE PLACE IMMEDIATELY. PETERSON
What forecasters said that day
The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
In the hours before
Special weather statement, Aug 9, 1:41 PM PDT, 2 hours 19 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SAN DIEGO CA 1:40 PM PDT WED AUG 09 1989 ...DEVELOPING THUNDERSTORMS HAVE PROMPTED A FLASH FLOOD WATCH FOR SAN DIEGO MOUNTAINS AND DESERTS TIL 9 PM PDT... THUNDERSTORMS IN A MOIST SOUTHERLY FLOW ARE RAPIDLY DEVELOPING AND HAVE PROMPTED A FLASH FLOOD WATCH FORTHE MOUNTAINS AND DESERTS OF SAN DIEGO COUNTY UNTIL 9 TONIGHT. SATELLITE PICTURES AND RADAR INDICATES THUNDERSTORMS ERUPTING RAPIDLY IN THE MOUNTAINS AND DESERTS OF SAN DIEGO COUNTY WITH STORMS HEADING NORTH. HEAVIEST RAINS SO FAR HAVE BEEN REPORTED FROM THE SANTA YSABEL ALERT RAIN GAGE WHERE 0.67 INCH FELL IN A HALF HOUR. SO FAR .08 INCH AT CUYAMACA. A FLASH FLOOD WATCH MEANS THAT FLASH FLOODING OF WASHES...SMALL STREAMS...RIVERS AND OTHER DRAINAGE AREAS IS POSSIBLE IN THE WATCH AREA. IF YOU ARE IN THE WATCH AREA KEEP AN EYE ON THE CHANGING WEATHER AND BE READY FOR IMMEDIATE ACTION IF HEAVY RAINS BEGIN OR A WARNING IS ISSSUED. SHIGEHARA
The office that day
Everything else NWS San Diego, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 9, 4:00 PM PDT | Severe Thunderstorm Warning | SGX | Imperial | 3 hr |
Nearby
Flash Flood Warnings in California, 1989Every flash flood warning in 1989
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.